Messari API
Crypto asset data and research API providing asset metrics (price, volume, market cap, supply), DeFi protocol data (TVL, revenue, fees), fundraising data, and qualitative research via structured REST API. Targets institutional-grade data consumers. Messari is known for standardized cross-protocol metrics that enable apples-to-apples comparisons.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
HTTPS enforced. Single API key with no scope granularity. All data is public market data — no user PII. Key rotation recommended periodically.
⚡ Reliability
Best When
You need institutional-quality, standardized crypto protocol metrics and research data for agent financial analysis, with consistent cross-protocol schemas.
Avoid When
You need real-time pricing, a generous free tier, or you're working with assets outside crypto.
Use Cases
- • Fetch standardized asset metrics (market cap, price, volume, circulating supply) for any major crypto asset for agent portfolio valuation
- • Query protocol-level DeFi metrics (TVL, revenue, active addresses, transaction volume) across comparable protocols for agent research
- • Access fundraising and investor data (venture rounds, team info) for agent due diligence workflows on crypto projects
- • Retrieve token unlock schedules and vesting data for agent tracking of potential sell pressure on agent-held positions
- • Get qualitative asset profiles (tags, sector classification, description) for agent taxonomy and classification pipelines
Not For
- • Real-time tick-level price data — Messari updates hourly/daily; use CoinGecko, CoinMarketCap, or exchange APIs for real-time quotes
- • Non-crypto financial data — Messari covers crypto assets only
- • Developers who need a generous free tier — Messari's free tier is very limited; meaningful API access requires paid plans
Interface
Authentication
API key passed as x-messari-api-key header. Some endpoints accessible without auth at lower rate limits. Paid tier key unlocks additional endpoints and higher rate limits.
Pricing
Most useful API data (protocol metrics, DeFi analytics, fundraising) requires Pro plan. Free tier covers basic price and market cap data only.
Agent Metadata
Known Gotchas
- ⚠ Asset slugs (e.g., 'bitcoin', 'ethereum') are used as identifiers, not tickers — agents must use Messari's slug convention, not CoinGecko or CoinMarketCap IDs
- ⚠ Protocol metrics (TVL, revenue, fees) only available on Pro plan — free tier agents only see basic market data
- ⚠ Data updates are daily or hourly for most metrics — not suitable for real-time price queries; use CoinGecko for live prices
- ⚠ Not all assets have protocol metrics — many long-tail assets only have market data; check asset availability before building pipelines
- ⚠ Messari's asset taxonomy and sector labels differ from other data providers — agents combining Messari with other sources must handle classification mismatches
Alternatives
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Scores are editorial opinions as of 2026-03-07.