Implement CoinGecko API Client with Comprehensive Data Fetching

[HermanKoii]

Implement CoinGecko API Client with Comprehensive Data Fetching

Description

Task

create a coin gekko api

Acceptance Criteria

• Can fetch individual coin data
• Can list top cryptocurrencies
• Provides structured, typed responses
• Handles potential API errors gracefully

Summary of Work

CoinGecko API Client Implementation

Overview

This pull request implements a robust CoinGecko API client with two primary methods for fetching cryptocurrency data:

• Retrieve detailed information for a specific coin
• List top cryptocurrencies by market capitalization

Key Features

• Flexible API initialization with optional base URL and API key
• Error handling for API requests
• Typed responses with success/error metadata
• Support for fetching individual coin data
• Support for listing top cryptocurrencies

Implementation Details

1. CoinGekkoApi Class

   • Utilizes axios for HTTP requests
   • Configurable base URL (defaults to CoinGecko v3 API)
   • Optional API key support for future extensions

2. Methods

   • fetchCoinData(coinId: string):
     • Retrieves detailed information for a specific cryptocurrency
     • Returns structured CoinData with price, market cap, and volume
   • listCoins(limit: number = 100):
     • Fetches top cryptocurrencies
     • Supports configurable limit (default 100)
     • Sorted by market capitalization

3. Error Handling

   • Comprehensive error management
   • Returns consistent FetchResult interface for both successful and failed requests

Potential Future Improvements

• Add more granular coin data retrieval
• Implement caching mechanism
• Add more comprehensive error types

Changes Made

• Implemented CoinGekkoApi class in src/index.ts
• Created TypeScript interfaces in src/types.ts
• Added axios as a dependency for HTTP requests
• Implemented fetchCoinData method to retrieve individual coin information
• Implemented listCoins method to fetch top cryptocurrencies
• Added comprehensive error handling
• Created typed response structure

Tests

• Verify fetchCoinData returns correct coin information
• Verify listCoins returns top cryptocurrencies
• Ensure error handling works for invalid coin IDs
• Check default and custom base URL configuration
• Validate response type consistency

Signatures

Staking Key

0x1234567890123456789012345678901234567890: 0x1234567890123456789012345678901234567890

Public Key

0x1234567890123456789012345678901234567890: 0x1234567890123456789012345678901234567890