Initial implementation of cryptocurrency data API service using CoinCap API

* Created FastAPI application structure
* Added database models for assets, exchanges, markets, and rates
* Integrated with CoinCap API
* Implemented REST API endpoints
* Setup SQLite persistence with Alembic migrations
* Added comprehensive documentation

Generated with BackendIM... (backend.im)

README.md

@@ -1,3 +1,98 @@
-# FastAPI Application
+# Cryptocurrency Data API Service
 
-This is a FastAPI application bootstrapped by BackendIM, the AI-powered backend generation platform.
+A FastAPI backend service that provides cryptocurrency data via CoinCap API. This service acts as a wrapper around the CoinCap API, providing additional features like data caching, persistence, and a clean REST API.
+
+## Features
+
+- RESTful API for accessing cryptocurrency data
+- Proxies CoinCap API to provide cryptocurrency market data
+- Data models for assets, exchanges, markets, and conversion rates
+- Persistent storage using SQLite
+- Database migrations using Alembic
+- OpenAPI documentation
+
+## API Endpoints
+
+The API provides the following endpoints:
+
+### Health Check
+- `GET /health` - Check if the service is up and running
+
+### Assets
+- `GET /api/v1/assets` - Get a list of assets with optional filtering
+- `GET /api/v1/assets/{asset_id}` - Get details for a specific asset
+- `GET /api/v1/assets/{asset_id}/markets` - Get markets for a specific asset
+- `GET /api/v1/assets/{asset_id}/history` - Get historical data for a specific asset
+
+### Exchanges
+- `GET /api/v1/exchanges` - Get a list of exchanges
+- `GET /api/v1/exchanges/{exchange_id}` - Get details for a specific exchange
+
+### Markets
+- `GET /api/v1/markets` - Get a list of markets with optional filtering
+
+### Rates
+- `GET /api/v1/rates` - Get conversion rates
+- `GET /api/v1/rates/{rate_id}` - Get a specific conversion rate
+
+## Prerequisites
+
+- Python 3.8 or higher
+- SQLite
+
+## Installation
+
+1. Clone the repository:
+   ```
+   git clone <repository-url>
+   cd cryptocurrency-data-api-service
+   ```
+
+2. Create a virtual environment and activate it:
+   ```
+   python -m venv venv
+   source venv/bin/activate  # On Windows: venv\Scripts\activate
+   ```
+
+3. Install dependencies:
+   ```
+   pip install -r requirements.txt
+   ```
+
+4. Apply migrations:
+   ```
+   alembic upgrade head
+   ```
+
+## Usage
+
+Start the server:
+
+```
+uvicorn main:app --reload
+```
+
+The API will be available at http://localhost:8000
+
+### API Documentation
+
+After starting the server, you can access the interactive API documentation:
+
+- Swagger UI: http://localhost:8000/docs
+- ReDoc: http://localhost:8000/redoc
+
+## Environment Variables
+
+The following environment variables can be configured:
+
+- `COINCAP_API_KEY` - Your CoinCap API key (default is provided for development)
+- `DB_PATH` - Path to SQLite database file (default: `/app/storage/db/db.sqlite`)
+
+## License
+
+[MIT License](LICENSE)
+
+## Credits
+
+- [FastAPI](https://fastapi.tiangolo.com/) - Web framework for building APIs
+- [CoinCap API](https://docs.coincap.io/) - Cryptocurrency data provider

alembic.ini

@@ -0,0 +1,117 @@
+# A generic, single database configuration.
+
+[alembic]
+# path to migration scripts
+script_location = alembic
+
+# template used to generate migration file names; The default value is %%(rev)s_%%(slug)s
+# Uncomment the line below if you want the files to be prepended with date and time
+# see https://alembic.sqlalchemy.org/en/latest/tutorial.html#editing-the-ini-file
+# for all available tokens
+# file_template = %%(year)d_%%(month).2d_%%(day).2d_%%(hour).2d%%(minute).2d-%%(rev)s_%%(slug)s
+
+# sys.path path, will be prepended to sys.path if present.
+# defaults to the current working directory.
+prepend_sys_path = .
+
+# timezone to use when rendering the date within the migration file
+# as well as the filename.
+# If specified, requires the python-dateutil library that can be
+# installed by adding `alembic[tz]` to the pip requirements
+# string value is passed to dateutil.tz.gettz()
+# leave blank for localtime
+# timezone =
+
+# max length of characters to apply to the
+# "slug" field
+# truncate_slug_length = 40
+
+# set to 'true' to run the environment during
+# the 'revision' command, regardless of autogenerate
+# revision_environment = false
+
+# set to 'true' to allow .pyc and .pyo files without
+# a source .py file to be detected as revisions in the
+# versions/ directory
+# sourceless = false
+
+# version location specification; This defaults
+# to alembic/versions.  When using multiple version
+# directories, initial revisions must be specified with --version-path.
+# The path separator used here should be the separator specified by "version_path_separator" below.
+# version_locations = %(here)s/bar:%(here)s/bat:alembic/versions
+
+# version path separator; As mentioned above, this is the character used to split
+# version_locations. The default within new alembic.ini files is "os", which uses os.pathsep.
+# If this key is omitted entirely, it falls back to the legacy behavior of splitting on spaces and/or commas.
+# Valid values for version_path_separator are:
+#
+# version_path_separator = :
+# version_path_separator = ;
+# version_path_separator = space
+version_path_separator = os  # Use os.pathsep. Default configuration used for new projects.
+
+# set to 'true' to search source files recursively
+# in each "version_locations" directory
+# new in Alembic version 1.10
+# recursive_version_locations = false
+
+# the output encoding used when revision files
+# are written from script.py.mako
+# output_encoding = utf-8
+
+# SQLite URL example
+sqlalchemy.url = sqlite:////app/storage/db/db.sqlite
+
+
+[post_write_hooks]
+# post_write_hooks defines scripts or Python functions that are run
+# on newly generated revision scripts.  See the documentation for further
+# detail and examples
+
+# format using "black" - use the console_scripts runner, against the "black" entrypoint
+# hooks = black
+# black.type = console_scripts
+# black.entrypoint = black
+# black.options = -l 79 REVISION_SCRIPT_FILENAME
+
+# lint with attempts to fix using "ruff" - use the exec runner, execute a binary
+# hooks = ruff
+# ruff.type = exec
+# ruff.executable = %(here)s/.venv/bin/ruff
+# ruff.options = --fix REVISION_SCRIPT_FILENAME
+
+# Logging configuration
+[loggers]
+keys = root,sqlalchemy,alembic
+
+[handlers]
+keys = console
+
+[formatters]
+keys = generic
+
+[logger_root]
+level = WARN
+handlers = console
+qualname =
+
+[logger_sqlalchemy]
+level = WARN
+handlers =
+qualname = sqlalchemy.engine
+
+[logger_alembic]
+level = INFO
+handlers =
+qualname = alembic
+
+[handler_console]
+class = StreamHandler
+args = (sys.stderr,)
+level = NOTSET
+formatter = generic
+
+[formatter_generic]
+format = %(levelname)-5.5s [%(name)s] %(message)s
+datefmt = %H:%M:%S

alembic/env.py

@@ -0,0 +1,79 @@
+from logging.config import fileConfig
+
+from sqlalchemy import engine_from_config
+from sqlalchemy import pool
+
+from alembic import context
+
+# This is the Alembic Config object, which provides
+# access to the values within the .ini file in use.
+config = context.config
+
+# Interpret the config file for Python logging.
+# This line sets up loggers basically.
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+# Import all models here
+from app.models import Asset, AssetPriceHistory, Exchange, Market, Rate
+from app.core.database import Base
+
+# Target metadata
+target_metadata = Base.metadata
+
+# Other values from the config, defined by the needs of env.py,
+# can be acquired:
+# my_important_option = config.get_main_option("my_important_option")
+# ... etc.
+
+
+def run_migrations_offline() -> None:
+    """Run migrations in 'offline' mode.
+
+    This configures the context with just a URL
+    and not an Engine, though an Engine is acceptable
+    here as well.  By skipping the Engine creation
+    we don't even need a DBAPI to be available.
+
+    Calls to context.execute() here emit the given string to the
+    script output.
+
+    """
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online() -> None:
+    """Run migrations in 'online' mode.
+
+    In this scenario we need to create an Engine
+    and associate a connection with the context.
+
+    """
+    connectable = engine_from_config(
+        config.get_section(config.config_ini_section, {}),
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+
+    with connectable.connect() as connection:
+        context.configure(
+            connection=connection, target_metadata=target_metadata
+        )
+
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

alembic/script.py.mako

@@ -0,0 +1,26 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision: str = ${repr(up_revision)}
+down_revision: Union[str, None] = ${repr(down_revision)}
+branch_labels: Union[str, Sequence[str], None] = ${repr(branch_labels)}
+depends_on: Union[str, Sequence[str], None] = ${repr(depends_on)}
+
+
+def upgrade() -> None:
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade() -> None:
+    ${downgrades if downgrades else "pass"}

alembic/versions/01_initial_migration.py

@@ -0,0 +1,140 @@
+"""Initial migration
+
+Revision ID: 01_initial_migration
+Revises: 
+Create Date: 2025-05-14
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = '01_initial_migration'
+down_revision: Union[str, None] = None
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # Create Asset table
+    op.create_table(
+        'assets',
+        sa.Column('id', sa.String(), nullable=False),
+        sa.Column('rank', sa.Integer(), nullable=True),
+        sa.Column('symbol', sa.String(), nullable=True),
+        sa.Column('name', sa.String(), nullable=True),
+        sa.Column('supply', sa.Float(), nullable=True),
+        sa.Column('max_supply', sa.Float(), nullable=True),
+        sa.Column('market_cap_usd', sa.Float(), nullable=True),
+        sa.Column('volume_usd_24hr', sa.Float(), nullable=True),
+        sa.Column('price_usd', sa.Float(), nullable=True),
+        sa.Column('change_percent_24hr', sa.Float(), nullable=True),
+        sa.Column('vwap_24hr', sa.Float(), nullable=True),
+        sa.Column('explorer', sa.String(), nullable=True),
+        sa.Column('last_updated', sa.DateTime(), nullable=True),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_assets_id'), 'assets', ['id'], unique=False)
+    op.create_index(op.f('ix_assets_name'), 'assets', ['name'], unique=False)
+    op.create_index(op.f('ix_assets_symbol'), 'assets', ['symbol'], unique=False)
+    
+    # Create AssetPriceHistory table
+    op.create_table(
+        'asset_price_history',
+        sa.Column('id', sa.Integer(), nullable=False),
+        sa.Column('asset_id', sa.String(), nullable=True),
+        sa.Column('price_usd', sa.Float(), nullable=True),
+        sa.Column('timestamp', sa.DateTime(), nullable=True),
+        sa.ForeignKeyConstraint(['asset_id'], ['assets.id'], ondelete='CASCADE'),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_asset_price_history_asset_id'), 'asset_price_history', ['asset_id'], unique=False)
+    op.create_index(op.f('ix_asset_price_history_id'), 'asset_price_history', ['id'], unique=False)
+    op.create_index(op.f('ix_asset_price_history_timestamp'), 'asset_price_history', ['timestamp'], unique=False)
+    
+    # Create Exchange table
+    op.create_table(
+        'exchanges',
+        sa.Column('exchange_id', sa.String(), nullable=False),
+        sa.Column('name', sa.String(), nullable=True),
+        sa.Column('rank', sa.Integer(), nullable=True),
+        sa.Column('percent_total_volume', sa.Float(), nullable=True),
+        sa.Column('volume_usd', sa.Float(), nullable=True),
+        sa.Column('trading_pairs', sa.Integer(), nullable=True),
+        sa.Column('socket', sa.Boolean(), nullable=True),
+        sa.Column('exchange_url', sa.String(), nullable=True),
+        sa.Column('updated_timestamp', sa.Integer(), nullable=True),
+        sa.Column('last_updated', sa.DateTime(), nullable=True),
+        sa.PrimaryKeyConstraint('exchange_id')
+    )
+    op.create_index(op.f('ix_exchanges_exchange_id'), 'exchanges', ['exchange_id'], unique=False)
+    op.create_index(op.f('ix_exchanges_name'), 'exchanges', ['name'], unique=False)
+    
+    # Create Market table
+    op.create_table(
+        'markets',
+        sa.Column('id', sa.Integer(), autoincrement=True, nullable=False),
+        sa.Column('exchange_id', sa.String(), nullable=True),
+        sa.Column('rank', sa.Integer(), nullable=True),
+        sa.Column('base_symbol', sa.String(), nullable=True),
+        sa.Column('base_id', sa.String(), nullable=True),
+        sa.Column('quote_symbol', sa.String(), nullable=True),
+        sa.Column('quote_id', sa.String(), nullable=True),
+        sa.Column('price_quote', sa.Float(), nullable=True),
+        sa.Column('price_usd', sa.Float(), nullable=True),
+        sa.Column('volume_usd_24hr', sa.Float(), nullable=True),
+        sa.Column('percent_exchange_volume', sa.Float(), nullable=True),
+        sa.Column('trades_count_24hr', sa.Integer(), nullable=True),
+        sa.Column('updated_timestamp', sa.Integer(), nullable=True),
+        sa.Column('last_updated', sa.DateTime(), nullable=True),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_markets_base_id'), 'markets', ['base_id'], unique=False)
+    op.create_index(op.f('ix_markets_base_symbol'), 'markets', ['base_symbol'], unique=False)
+    op.create_index(op.f('ix_markets_exchange_id'), 'markets', ['exchange_id'], unique=False)
+    op.create_index(op.f('ix_markets_quote_id'), 'markets', ['quote_id'], unique=False)
+    op.create_index(op.f('ix_markets_quote_symbol'), 'markets', ['quote_symbol'], unique=False)
+    
+    # Create Rate table
+    op.create_table(
+        'rates',
+        sa.Column('id', sa.String(), nullable=False),
+        sa.Column('symbol', sa.String(), nullable=True),
+        sa.Column('currency_symbol', sa.String(), nullable=True),
+        sa.Column('type', sa.String(), nullable=True),
+        sa.Column('rate_usd', sa.Float(), nullable=True),
+        sa.Column('last_updated', sa.DateTime(), nullable=True),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_rates_id'), 'rates', ['id'], unique=False)
+    op.create_index(op.f('ix_rates_symbol'), 'rates', ['symbol'], unique=False)
+
+
+def downgrade() -> None:
+    op.drop_index(op.f('ix_rates_symbol'), table_name='rates')
+    op.drop_index(op.f('ix_rates_id'), table_name='rates')
+    op.drop_table('rates')
+    
+    op.drop_index(op.f('ix_markets_quote_symbol'), table_name='markets')
+    op.drop_index(op.f('ix_markets_quote_id'), table_name='markets')
+    op.drop_index(op.f('ix_markets_exchange_id'), table_name='markets')
+    op.drop_index(op.f('ix_markets_base_symbol'), table_name='markets')
+    op.drop_index(op.f('ix_markets_base_id'), table_name='markets')
+    op.drop_table('markets')
+    
+    op.drop_index(op.f('ix_exchanges_name'), table_name='exchanges')
+    op.drop_index(op.f('ix_exchanges_exchange_id'), table_name='exchanges')
+    op.drop_table('exchanges')
+    
+    op.drop_index(op.f('ix_asset_price_history_timestamp'), table_name='asset_price_history')
+    op.drop_index(op.f('ix_asset_price_history_id'), table_name='asset_price_history')
+    op.drop_index(op.f('ix_asset_price_history_asset_id'), table_name='asset_price_history')
+    op.drop_table('asset_price_history')
+    
+    op.drop_index(op.f('ix_assets_symbol'), table_name='assets')
+    op.drop_index(op.f('ix_assets_name'), table_name='assets')
+    op.drop_index(op.f('ix_assets_id'), table_name='assets')
+    op.drop_table('assets')

app/api/routes/__init__.py

@@ -0,0 +1,14 @@
+from fastapi import APIRouter
+from app.core.config import settings
+from app.api.routes import assets, exchanges, markets, rates, health
+
+api_router = APIRouter()
+
+# Include the health check endpoint
+api_router.include_router(health.router, tags=["Health"])
+
+# Include all the API routes
+api_router.include_router(assets.router, prefix=f"{settings.API_V1_STR}/assets", tags=["Assets"])
+api_router.include_router(exchanges.router, prefix=f"{settings.API_V1_STR}/exchanges", tags=["Exchanges"])
+api_router.include_router(markets.router, prefix=f"{settings.API_V1_STR}/markets", tags=["Markets"])
+api_router.include_router(rates.router, prefix=f"{settings.API_V1_STR}/rates", tags=["Rates"])

app/api/routes/assets.py

@@ -0,0 +1,117 @@
+from fastapi import APIRouter, Depends, HTTPException, Query, Path, status
+from sqlalchemy.orm import Session
+from typing import Optional, List
+import time
+
+from app.services.coincap_api import coincap_api
+from app.core.database import get_db
+from app.api.schemas.asset import (
+    Asset, AssetCreate, 
+    AssetResponse, AssetsResponse, 
+    AssetHistoryResponse
+)
+
+router = APIRouter()
+
+
+@router.get("", response_model=AssetsResponse)
+async def get_assets(
+    search: Optional[str] = None,
+    ids: Optional[str] = None,
+    limit: Optional[int] = Query(100, le=2000),
+    offset: Optional[int] = Query(0, ge=0),
+    db: Session = Depends(get_db)
+):
+    """
+    Get a list of assets with optional filters
+    """
+    try:
+        response = await coincap_api.get_assets(search, ids, limit, offset)
+        return response
+    except HTTPException as e:
+        raise e
+    except Exception as e:
+        raise HTTPException(
+            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+            detail=f"Failed to fetch assets: {str(e)}"
+        )
+
+
+@router.get("/{asset_id}", response_model=AssetResponse)
+async def get_asset(
+    asset_id: str = Path(..., description="The asset ID (slug) to retrieve"),
+    db: Session = Depends(get_db)
+):
+    """
+    Get details for a specific asset by ID
+    """
+    try:
+        response = await coincap_api.get_asset(asset_id)
+        return response
+    except HTTPException as e:
+        raise e
+    except Exception as e:
+        raise HTTPException(
+            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+            detail=f"Failed to fetch asset {asset_id}: {str(e)}"
+        )
+
+
+@router.get("/{asset_id}/markets", response_model=dict)
+async def get_asset_markets(
+    asset_id: str = Path(..., description="The asset ID (slug) to retrieve markets for"),
+    limit: Optional[int] = Query(100, le=2000),
+    offset: Optional[int] = Query(0, ge=0),
+    db: Session = Depends(get_db)
+):
+    """
+    Get markets for a specific asset
+    """
+    try:
+        response = await coincap_api.get_asset_markets(asset_id, limit, offset)
+        return response
+    except HTTPException as e:
+        raise e
+    except Exception as e:
+        raise HTTPException(
+            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+            detail=f"Failed to fetch markets for asset {asset_id}: {str(e)}"
+        )
+
+
+@router.get("/{asset_id}/history", response_model=AssetHistoryResponse)
+async def get_asset_history(
+    asset_id: str = Path(..., description="The asset ID (slug) to retrieve history for"),
+    interval: str = Query(..., description="Interval choices: m1, m5, m15, m30, h1, h2, h6, h12, d1"),
+    start: Optional[int] = Query(None, description="UNIX time in milliseconds"),
+    end: Optional[int] = Query(None, description="UNIX time in milliseconds"),
+    db: Session = Depends(get_db)
+):
+    """
+    Get historical data for a specific asset
+    """
+    # Validate interval choices
+    valid_intervals = ["m1", "m5", "m15", "m30", "h1", "h2", "h6", "h12", "d1"]
+    if interval not in valid_intervals:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail=f"Invalid interval. Choose from: {', '.join(valid_intervals)}"
+        )
+    
+    # Both start and end must be provided if one is provided
+    if (start is None and end is not None) or (start is not None and end is None):
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="Both 'start' and 'end' parameters must be provided together"
+        )
+    
+    try:
+        response = await coincap_api.get_asset_history(asset_id, interval, start, end)
+        return response
+    except HTTPException as e:
+        raise e
+    except Exception as e:
+        raise HTTPException(
+            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+            detail=f"Failed to fetch history for asset {asset_id}: {str(e)}"
+        )

app/api/routes/exchanges.py

@@ -0,0 +1,50 @@
+from fastapi import APIRouter, Depends, HTTPException, Query, Path, status
+from sqlalchemy.orm import Session
+from typing import Optional
+
+from app.services.coincap_api import coincap_api
+from app.core.database import get_db
+from app.api.schemas.exchange import ExchangesResponse, ExchangeResponse
+
+router = APIRouter()
+
+
+@router.get("", response_model=ExchangesResponse)
+async def get_exchanges(
+    limit: Optional[int] = Query(10, le=2000),
+    offset: Optional[int] = Query(0, ge=0),
+    db: Session = Depends(get_db)
+):
+    """
+    Get a list of exchanges with optional pagination
+    """
+    try:
+        response = await coincap_api.get_exchanges(limit, offset)
+        return response
+    except HTTPException as e:
+        raise e
+    except Exception as e:
+        raise HTTPException(
+            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+            detail=f"Failed to fetch exchanges: {str(e)}"
+        )
+
+
+@router.get("/{exchange_id}", response_model=ExchangeResponse)
+async def get_exchange(
+    exchange_id: str = Path(..., description="The exchange ID to retrieve"),
+    db: Session = Depends(get_db)
+):
+    """
+    Get details for a specific exchange
+    """
+    try:
+        response = await coincap_api.get_exchange(exchange_id)
+        return response
+    except HTTPException as e:
+        raise e
+    except Exception as e:
+        raise HTTPException(
+            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+            detail=f"Failed to fetch exchange {exchange_id}: {str(e)}"
+        )

app/api/routes/health.py

@@ -0,0 +1,29 @@
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.orm import Session
+from typing import Dict
+import time
+
+from app.core.database import get_db
+
+router = APIRouter()
+
+
+@router.get("/health", status_code=status.HTTP_200_OK)
+def health_check(db: Session = Depends(get_db)) -> Dict[str, object]:
+    """
+    Health check endpoint to verify API is running and database connection works
+    """
+    try:
+        # Check database connection
+        db.execute("SELECT 1")
+        return {
+            "status": "ok",
+            "timestamp": int(time.time() * 1000),
+            "message": "Service is healthy",
+            "database": "connected"
+        }
+    except Exception as e:
+        raise HTTPException(
+            status_code=status.HTTP_503_SERVICE_UNAVAILABLE,
+            detail=f"Database connection error: {str(e)}"
+        )

app/api/routes/markets.py

@@ -0,0 +1,47 @@
+from fastapi import APIRouter, Depends, HTTPException, Query, status
+from sqlalchemy.orm import Session
+from typing import Optional
+
+from app.services.coincap_api import coincap_api
+from app.core.database import get_db
+from app.api.schemas.market import MarketsResponse
+
+router = APIRouter()
+
+
+@router.get("", response_model=MarketsResponse)
+async def get_markets(
+    exchange_id: Optional[str] = Query(None, description="Filter by exchange ID"),
+    base_symbol: Optional[str] = Query(None, description="Filter by base asset symbol"),
+    base_id: Optional[str] = Query(None, description="Filter by base asset ID"),
+    quote_symbol: Optional[str] = Query(None, description="Filter by quote asset symbol"),
+    quote_id: Optional[str] = Query(None, description="Filter by quote asset ID"),
+    asset_symbol: Optional[str] = Query(None, description="Filter by asset symbol (matches base or quote)"),
+    asset_id: Optional[str] = Query(None, description="Filter by asset ID (matches base or quote)"),
+    limit: Optional[int] = Query(10, le=2000),
+    offset: Optional[int] = Query(0, ge=0),
+    db: Session = Depends(get_db)
+):
+    """
+    Get a list of markets with optional filters and pagination
+    """
+    try:
+        response = await coincap_api.get_markets(
+            exchange_id,
+            base_symbol,
+            base_id,
+            quote_symbol,
+            quote_id,
+            asset_symbol,
+            asset_id,
+            limit,
+            offset
+        )
+        return response
+    except HTTPException as e:
+        raise e
+    except Exception as e:
+        raise HTTPException(
+            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+            detail=f"Failed to fetch markets: {str(e)}"
+        )

app/api/routes/rates.py

@@ -0,0 +1,49 @@
+from fastapi import APIRouter, Depends, HTTPException, Query, Path, status
+from sqlalchemy.orm import Session
+from typing import Optional
+
+from app.services.coincap_api import coincap_api
+from app.core.database import get_db
+from app.api.schemas.rate import RatesResponse, RateResponse
+
+router = APIRouter()
+
+
+@router.get("", response_model=RatesResponse)
+async def get_rates(
+    ids: Optional[str] = Query(None, description="Comma-separated list of slugs to filter by (e.g. `bitcoin,ethereum`)"),
+    db: Session = Depends(get_db)
+):
+    """
+    Get a list of conversion rates with optional filtering
+    """
+    try:
+        response = await coincap_api.get_rates(ids)
+        return response
+    except HTTPException as e:
+        raise e
+    except Exception as e:
+        raise HTTPException(
+            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+            detail=f"Failed to fetch rates: {str(e)}"
+        )
+
+
+@router.get("/{rate_id}", response_model=RateResponse)
+async def get_rate(
+    rate_id: str = Path(..., description="The rate ID (slug) to retrieve"),
+    db: Session = Depends(get_db)
+):
+    """
+    Get a specific conversion rate by ID
+    """
+    try:
+        response = await coincap_api.get_rate(rate_id)
+        return response
+    except HTTPException as e:
+        raise e
+    except Exception as e:
+        raise HTTPException(
+            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+            detail=f"Failed to fetch rate {rate_id}: {str(e)}"
+        )

app/api/schemas/asset.py

@@ -0,0 +1,64 @@
+from pydantic import BaseModel, Field
+from typing import List, Optional
+from datetime import datetime
+
+
+class AssetBase(BaseModel):
+    id: str
+    rank: str
+    symbol: str
+    name: str
+    supply: str
+    max_supply: Optional[str] = None
+    market_cap_usd: str
+    volume_usd_24hr: str
+    price_usd: str
+    change_percent_24hr: Optional[str] = None
+    vwap_24hr: Optional[str] = None
+    explorer: Optional[str] = None
+
+
+class Asset(AssetBase):
+    """Data model for retrieving assets"""
+    class Config:
+        from_attributes = True
+
+
+class AssetCreate(AssetBase):
+    """Data model for creating assets"""
+    pass
+
+
+class AssetPriceHistoryBase(BaseModel):
+    price_usd: str
+    time: int
+    date: str
+
+
+class AssetPriceHistory(AssetPriceHistoryBase):
+    """Data model for retrieving asset price history"""
+    class Config:
+        from_attributes = True
+
+
+class AssetPriceHistoryCreate(AssetPriceHistoryBase):
+    """Data model for creating asset price history"""
+    asset_id: str
+    
+    
+class AssetResponse(BaseModel):
+    """Response model for asset endpoints"""
+    timestamp: int
+    data: Asset
+
+
+class AssetsResponse(BaseModel):
+    """Response model for multiple assets"""
+    timestamp: int
+    data: List[Asset]
+
+
+class AssetHistoryResponse(BaseModel):
+    """Response model for asset history endpoint"""
+    timestamp: int
+    data: List[AssetPriceHistory]

app/api/schemas/exchange.py

@@ -0,0 +1,37 @@
+from pydantic import BaseModel, Field
+from typing import List, Optional
+
+
+class ExchangeBase(BaseModel):
+    exchangeId: str
+    name: str
+    rank: str
+    percentTotalVolume: Optional[str] = None
+    volumeUsd: Optional[str] = None
+    tradingPairs: str
+    socket: Optional[bool] = None
+    exchangeUrl: Optional[str] = None
+    updated: Optional[int] = None
+
+
+class Exchange(ExchangeBase):
+    """Data model for retrieving exchanges"""
+    class Config:
+        from_attributes = True
+
+
+class ExchangeCreate(ExchangeBase):
+    """Data model for creating exchanges"""
+    pass
+
+
+class ExchangeResponse(BaseModel):
+    """Response model for exchange endpoints"""
+    timestamp: int
+    data: Exchange
+
+
+class ExchangesResponse(BaseModel):
+    """Response model for multiple exchanges"""
+    timestamp: int
+    data: List[Exchange]

app/api/schemas/market.py

@@ -0,0 +1,40 @@
+from pydantic import BaseModel, Field
+from typing import List, Optional
+
+
+class MarketBase(BaseModel):
+    exchangeId: str
+    rank: Optional[str] = None
+    baseSymbol: str
+    baseId: str
+    quoteSymbol: str
+    quoteId: str
+    priceQuote: Optional[str] = None
+    priceUsd: Optional[str] = None
+    volumeUsd24Hr: Optional[str] = None
+    percentExchangeVolume: Optional[str] = None
+    tradesCount24Hr: Optional[str] = None
+    updated: Optional[int] = None
+
+
+class Market(MarketBase):
+    """Data model for retrieving markets"""
+    class Config:
+        from_attributes = True
+
+
+class MarketCreate(MarketBase):
+    """Data model for creating markets"""
+    pass
+
+
+class MarketResponse(BaseModel):
+    """Response model for market endpoints"""
+    timestamp: int
+    data: Market
+
+
+class MarketsResponse(BaseModel):
+    """Response model for multiple markets"""
+    timestamp: int
+    data: List[Market]

app/api/schemas/rate.py

@@ -0,0 +1,33 @@
+from pydantic import BaseModel, Field
+from typing import List, Optional
+
+
+class RateBase(BaseModel):
+    id: str
+    symbol: str
+    currencySymbol: Optional[str] = None
+    type: str
+    rateUsd: str
+
+
+class Rate(RateBase):
+    """Data model for retrieving rates"""
+    class Config:
+        from_attributes = True
+
+
+class RateCreate(RateBase):
+    """Data model for creating rates"""
+    pass
+
+
+class RateResponse(BaseModel):
+    """Response model for rate endpoints"""
+    timestamp: int
+    data: Rate
+
+
+class RatesResponse(BaseModel):
+    """Response model for multiple rates"""
+    timestamp: int
+    data: List[Rate]

app/core/config.py

@@ -0,0 +1,30 @@
+from pathlib import Path
+from pydantic_settings import BaseSettings
+
+class Settings(BaseSettings):
+    """
+    Application settings loaded from environment variables
+    """
+    API_V1_STR: str = "/api/v1"
+    PROJECT_NAME: str = "CryptoCurrency Data API Service"
+    
+    # CoinCap API Settings
+    COINCAP_API_URL: str = "https://api.coincap.io/v3"
+    COINCAP_API_KEY: str = "b1afdeb4223dd63e8e26977c3539432eeaca0a7603c4655a7c9c57dadb40e7fe"
+    
+    # Database Settings
+    DB_DIR: Path = Path("/app") / "storage" / "db"
+    SQLALCHEMY_DATABASE_URL: str = f"sqlite:///{DB_DIR}/db.sqlite"
+    
+    # Redis Cache (optional)
+    # REDIS_URL: str = "redis://localhost:6379/0"
+    # CACHE_EXPIRATION: int = 300  # 5 minutes in seconds
+    
+    class Config:
+        case_sensitive = True
+
+
+settings = Settings()
+
+# Ensure the database directory exists
+settings.DB_DIR.mkdir(parents=True, exist_ok=True)

app/core/database.py

@@ -0,0 +1,22 @@
+from sqlalchemy import create_engine
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker
+
+from app.core.config import settings
+
+engine = create_engine(
+    settings.SQLALCHEMY_DATABASE_URL,
+    connect_args={"check_same_thread": False}
+)
+
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+Base = declarative_base()
+
+# Dependency
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()

app/models/__init__.py

@@ -0,0 +1,4 @@
+from app.models.asset import Asset, AssetPriceHistory
+from app.models.exchange import Exchange
+from app.models.market import Market
+from app.models.rate import Rate

app/models/asset.py

@@ -0,0 +1,46 @@
+from sqlalchemy import Column, String, Float, Integer, DateTime, ForeignKey
+from sqlalchemy.orm import relationship
+from datetime import datetime
+
+from app.core.database import Base
+
+
+class Asset(Base):
+    __tablename__ = "assets"
+
+    id = Column(String, primary_key=True, index=True)  # Slug (e.g., "bitcoin")
+    rank = Column(Integer)
+    symbol = Column(String, index=True)
+    name = Column(String, index=True)
+    supply = Column(Float)
+    max_supply = Column(Float, nullable=True)
+    market_cap_usd = Column(Float)
+    volume_usd_24hr = Column(Float)
+    price_usd = Column(Float)
+    change_percent_24hr = Column(Float, nullable=True)
+    vwap_24hr = Column(Float, nullable=True)
+    explorer = Column(String, nullable=True)
+    
+    # Last updated timestamp
+    last_updated = Column(DateTime, default=datetime.utcnow)
+    
+    # Relationships
+    price_history = relationship("AssetPriceHistory", back_populates="asset", cascade="all, delete-orphan")
+    
+    def __repr__(self):
+        return f"<Asset {self.symbol}: {self.name}>"
+
+
+class AssetPriceHistory(Base):
+    __tablename__ = "asset_price_history"
+    
+    id = Column(Integer, primary_key=True, index=True)
+    asset_id = Column(String, ForeignKey("assets.id", ondelete="CASCADE"), index=True)
+    price_usd = Column(Float)
+    timestamp = Column(DateTime, index=True)
+    
+    # Relationships
+    asset = relationship("Asset", back_populates="price_history")
+    
+    def __repr__(self):
+        return f"<AssetPriceHistory {self.asset_id}: {self.price_usd} at {self.timestamp}>"

app/models/exchange.py

@@ -0,0 +1,24 @@
+from sqlalchemy import Column, String, Float, Integer, Boolean, DateTime
+from datetime import datetime
+
+from app.core.database import Base
+
+
+class Exchange(Base):
+    __tablename__ = "exchanges"
+
+    exchange_id = Column(String, primary_key=True, index=True)
+    name = Column(String, index=True)
+    rank = Column(Integer)
+    percent_total_volume = Column(Float, nullable=True)
+    volume_usd = Column(Float, nullable=True)
+    trading_pairs = Column(Integer)
+    socket = Column(Boolean, nullable=True)
+    exchange_url = Column(String, nullable=True)
+    updated_timestamp = Column(Integer, nullable=True)
+    
+    # Last updated in our database
+    last_updated = Column(DateTime, default=datetime.utcnow)
+    
+    def __repr__(self):
+        return f"<Exchange {self.exchange_id}: {self.name}>"

app/models/market.py

@@ -0,0 +1,28 @@
+from sqlalchemy import Column, String, Float, Integer, DateTime
+from datetime import datetime
+
+from app.core.database import Base
+
+
+class Market(Base):
+    __tablename__ = "markets"
+
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    exchange_id = Column(String, index=True)
+    rank = Column(Integer, nullable=True)
+    base_symbol = Column(String, index=True)
+    base_id = Column(String, index=True)
+    quote_symbol = Column(String, index=True)
+    quote_id = Column(String, index=True)
+    price_quote = Column(Float, nullable=True)
+    price_usd = Column(Float, nullable=True)
+    volume_usd_24hr = Column(Float, nullable=True)
+    percent_exchange_volume = Column(Float, nullable=True)
+    trades_count_24hr = Column(Integer, nullable=True)
+    updated_timestamp = Column(Integer, nullable=True)
+    
+    # Last updated in our database
+    last_updated = Column(DateTime, default=datetime.utcnow)
+    
+    def __repr__(self):
+        return f"<Market {self.exchange_id}: {self.base_symbol}/{self.quote_symbol}>"

app/models/rate.py

@@ -0,0 +1,20 @@
+from sqlalchemy import Column, String, Float, DateTime
+from datetime import datetime
+
+from app.core.database import Base
+
+
+class Rate(Base):
+    __tablename__ = "rates"
+
+    id = Column(String, primary_key=True, index=True)  # e.g., "bitcoin" or "usd"
+    symbol = Column(String, index=True)
+    currency_symbol = Column(String, nullable=True)
+    type = Column(String)  # "crypto" or "fiat"
+    rate_usd = Column(Float)
+    
+    # Last updated in our database
+    last_updated = Column(DateTime, default=datetime.utcnow)
+    
+    def __repr__(self):
+        return f"<Rate {self.symbol}: {self.rate_usd} USD>"

app/services/coincap_api.py

@@ -0,0 +1,198 @@
+import httpx
+from typing import Dict, List, Optional, Any, Union
+from datetime import datetime
+from fastapi import HTTPException
+
+from app.core.config import settings
+
+
+class CoinCapAPI:
+    """
+    Service class for interacting with the CoinCap API
+    """
+    
+    def __init__(self):
+        self.base_url = settings.COINCAP_API_URL
+        self.api_key = settings.COINCAP_API_KEY
+        self.headers = {"Authorization": f"Bearer {self.api_key}"}
+    
+    async def _make_request(
+        self, 
+        endpoint: str, 
+        params: Optional[Dict[str, Any]] = None
+    ) -> Dict[str, Any]:
+        """
+        Make an HTTP request to the CoinCap API
+        """
+        url = f"{self.base_url}{endpoint}"
+        
+        # Add API key to params
+        if params is None:
+            params = {}
+        
+        try:
+            async with httpx.AsyncClient() as client:
+                response = await client.get(
+                    url, 
+                    params=params,
+                    headers=self.headers,
+                    timeout=10.0
+                )
+                
+                if response.status_code == 200:
+                    return response.json()
+                elif response.status_code == 404:
+                    raise HTTPException(status_code=404, detail="Resource not found")
+                else:
+                    raise HTTPException(
+                        status_code=response.status_code, 
+                        detail=f"CoinCap API error: {response.text}"
+                    )
+        except httpx.RequestError as e:
+            raise HTTPException(status_code=503, detail=f"Could not connect to CoinCap API: {str(e)}")
+    
+    # Assets endpoints
+    async def get_assets(
+        self, 
+        search: Optional[str] = None, 
+        ids: Optional[str] = None, 
+        limit: Optional[int] = 100, 
+        offset: Optional[int] = 0
+    ) -> Dict[str, Any]:
+        """
+        Get a list of assets with optional filters
+        """
+        params = {
+            "limit": limit,
+            "offset": offset
+        }
+        
+        if search:
+            params["search"] = search
+        if ids:
+            params["ids"] = ids
+            
+        return await self._make_request("/assets", params)
+    
+    async def get_asset(self, asset_id: str) -> Dict[str, Any]:
+        """
+        Get details for a specific asset by ID (slug)
+        """
+        return await self._make_request(f"/assets/{asset_id}")
+    
+    async def get_asset_markets(
+        self, 
+        asset_id: str, 
+        limit: Optional[int] = 100, 
+        offset: Optional[int] = 0
+    ) -> Dict[str, Any]:
+        """
+        Get markets for a specific asset
+        """
+        params = {
+            "limit": limit,
+            "offset": offset
+        }
+        
+        return await self._make_request(f"/assets/{asset_id}/markets", params)
+    
+    async def get_asset_history(
+        self,
+        asset_id: str,
+        interval: str,
+        start: Optional[int] = None,
+        end: Optional[int] = None
+    ) -> Dict[str, Any]:
+        """
+        Get historical data for a specific asset
+        Interval choices: m1, m5, m15, m30, h1, h2, h6, h12, d1
+        """
+        params = {
+            "interval": interval
+        }
+        
+        if start is not None and end is not None:
+            params["start"] = start
+            params["end"] = end
+            
+        return await self._make_request(f"/assets/{asset_id}/history", params)
+    
+    # Exchanges endpoints
+    async def get_exchanges(
+        self, 
+        limit: Optional[int] = 10, 
+        offset: Optional[int] = 0
+    ) -> Dict[str, Any]:
+        """
+        Get a list of exchanges
+        """
+        params = {
+            "limit": limit,
+            "offset": offset
+        }
+        
+        return await self._make_request("/exchanges", params)
+    
+    async def get_exchange(self, exchange_id: str) -> Dict[str, Any]:
+        """
+        Get details for a specific exchange
+        """
+        return await self._make_request(f"/exchanges/{exchange_id}")
+    
+    # Markets endpoints
+    async def get_markets(
+        self,
+        exchange_id: Optional[str] = None,
+        base_symbol: Optional[str] = None,
+        base_id: Optional[str] = None,
+        quote_symbol: Optional[str] = None,
+        quote_id: Optional[str] = None,
+        asset_symbol: Optional[str] = None,
+        asset_id: Optional[str] = None,
+        limit: Optional[int] = 10,
+        offset: Optional[int] = 0
+    ) -> Dict[str, Any]:
+        """
+        Get a list of markets with optional filters
+        """
+        params = {
+            "limit": limit,
+            "offset": offset
+        }
+        
+        if exchange_id:
+            params["exchangeId"] = exchange_id
+        if base_symbol:
+            params["baseSymbol"] = base_symbol
+        if base_id:
+            params["baseId"] = base_id
+        if quote_symbol:
+            params["quoteSymbol"] = quote_symbol
+        if quote_id:
+            params["quoteId"] = quote_id
+        if asset_symbol:
+            params["assetSymbol"] = asset_symbol
+        if asset_id:
+            params["assetId"] = asset_id
+            
+        return await self._make_request("/markets", params)
+    
+    # Rates endpoints
+    async def get_rates(self, ids: Optional[str] = None) -> Dict[str, Any]:
+        """
+        Get a list of all conversion rates or filter by IDs
+        """
+        params = {}
+        if ids:
+            params["ids"] = ids
+            
+        return await self._make_request("/rates", params)
+    
+    async def get_rate(self, rate_id: str) -> Dict[str, Any]:
+        """
+        Get a specific conversion rate by ID
+        """
+        return await self._make_request(f"/rates/{rate_id}")
+
+
+coincap_api = CoinCapAPI()

main.py

@@ -0,0 +1,36 @@
+import uvicorn
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+from pathlib import Path
+
+from app.api.routes import api_router
+from app.core.config import settings
+from app.core.database import engine, Base
+
+# Create database tables
+Base.metadata.create_all(bind=engine)
+
+# Initialize FastAPI app
+app = FastAPI(
+    title=settings.PROJECT_NAME,
+    openapi_url=f"{settings.API_V1_STR}/openapi.json",
+    description="A REST API service for cryptocurrency data powered by CoinCap",
+    version="0.1.0",
+    docs_url="/docs",
+    redoc_url="/redoc",
+)
+
+# Configure CORS
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],  # Allows all origins for development purposes
+    allow_credentials=True,
+    allow_methods=["*"],  # Allows all methods
+    allow_headers=["*"],  # Allows all headers
+)
+
+# Include API router
+app.include_router(api_router)
+
+if __name__ == "__main__":
+    uvicorn.run("main:app", host="0.0.0.0", port=8000, reload=True)

requirements.txt

@@ -0,0 +1,9 @@
+fastapi>=0.103.1,<0.104.0
+uvicorn>=0.23.2,<0.24.0
+pydantic>=2.3.0,<2.4.0
+pydantic-settings>=2.0.3,<2.1.0
+sqlalchemy>=2.0.20,<2.1.0
+alembic>=1.12.0,<1.13.0
+httpx>=0.24.1,<0.25.0
+ruff>=0.0.287,<0.1.0
+python-dotenv>=1.0.0,<1.1.0