CoinMarketCap API
Cryptocurrency market data API providing prices, market capitalizations, 24h volumes, rankings, and metadata for thousands of coins and tokens.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Header-based API key is good practice. No scopes or granular permissions. Owned by Binance — data flows through Binance infrastructure, which is a supply-chain consideration for regulated environments.
⚡ Reliability
Best When
An agent needs the authoritative source for cryptocurrency market cap rankings, broad coin/token coverage, and aggregated price data across many exchanges.
Avoid When
You need granular real-time order book data or exchange-specific trading APIs; or you need predictable per-call billing (credit-based pricing makes cost estimation hard).
Use Cases
- • Fetching current cryptocurrency prices and market cap rankings for portfolio agents
- • Monitoring global crypto market conditions and dominance metrics
- • Listing newly added or trending tokens for discovery agents
- • Converting between cryptocurrencies and fiat currencies
- • Pulling token metadata (supply, website, contract addresses) for due diligence workflows
Not For
- • Real-time tick-by-tick trade data (aggregated market data only, no exchange-level order books)
- • Executing trades — data API only, no broker functionality
- • DeFi protocol-specific metrics beyond basic price/volume
Interface
Authentication
API key passed via X-CMC_PRO_API_KEY header (preferred) or query parameter. Single key with no scopes. Free Basic key available immediately on signup.
Pricing
Credit-based pricing is confusing — different endpoints consume different numbers of credits per call. Agents must track credit consumption to avoid unexpected overages. Free tier covers basic price lookups but excludes historical data and many useful endpoints.
Agent Metadata
Known Gotchas
- ⚠ Credit-based rate limiting is non-intuitive — different endpoints consume different credit amounts and agents must budget accordingly
- ⚠ Free Basic plan excludes historical data endpoints, which are needed for most backtesting or trend analysis agents
- ⚠ CoinMarketCap is owned by Binance — consider data source bias in market cap rankings for regulatory or compliance contexts
- ⚠ Coin IDs (numeric) differ from symbols — always use CMC ID for programmatic lookups to avoid symbol collision (e.g., multiple tokens named 'DOGE')
- ⚠ Real-time prices reflect aggregated exchange data with slight lag — not suitable for HFT or arbitrage signals
- ⚠ Credit pool resets monthly, not on a rolling 30-day basis — agents may hit limits late in billing cycle
Alternatives
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Scores are editorial opinions as of 2026-03-07.