CoinGecko API
Comprehensive cryptocurrency market data API providing prices, market caps, volume, historical data, exchange data, and DeFi protocol metrics for 10,000+ coins and tokens.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
API key for Pro tier. Free tier: no key (rate limited). Cryptocurrency price data. No PII involved. Financial data — redistribution requires license compliance.
⚡ Reliability
Best When
An agent needs broad cryptocurrency market data across many chains, exchanges, and protocols without building exchange integrations.
Avoid When
You need ultra-low-latency crypto data or traditional financial market data.
Use Cases
- • Fetching real-time crypto prices and market caps for trading agents
- • Historical price data for backtesting crypto strategies
- • DeFi protocol TVL and yield data for yield optimization agents
- • Token contract address lookups for on-chain agents
- • Exchange volume and market data aggregation
Not For
- • Order execution (data only, not a broker)
- • Traditional stock market data
- • Ultra-low-latency tick-by-tick data (use exchange WebSockets instead)
Interface
Authentication
Free tier requires no API key (limited). Paid tiers use x-cg-demo-api-key or x-cg-pro-api-key header. Very simple auth.
Pricing
Free demo tier is useful for development. Pro pricing is steep for individual developers. No credit card required for free tier.
Agent Metadata
Known Gotchas
- ⚠ Free tier rate limits are very restrictive for agents making frequent price checks
- ⚠ Coin IDs are CoinGecko-specific slugs (e.g., 'bitcoin' not 'BTC') - agents must resolve symbols to IDs
- ⚠ Some endpoints unavailable on free/demo tier without upgrade
- ⚠ Data can be stale - update frequency varies by plan
- ⚠ Pro plan required for on-chain (DeFi) data endpoints
Alternatives
Full Evaluation Report
Detailed scoring breakdown, competitive positioning, security analysis, and improvement recommendations for CoinGecko API.
Scores are editorial opinions as of 2026-03-06.