# Yearn Finance GraphQL API

Yearn Finance's Kong GraphQL API is an integrated indexing and querying service that provides comprehensive on-chain data for Yearn V2 and V3 vault ecosystems. It exposes vault snapshots, strategy data, APY and TVL timeseries, harvest reports, transfer and deposit events, price feeds, risk scores, fee structures, staking rewards, and protocol governance roles across all EVM networks supported by Yearn (Ethereum, Optimism, Polygon, Fantom, Base, Arbitrum).

No authentication is required. The endpoint accepts standard GraphQL POST requests with a JSON body containing a `query` field.

**Endpoint:** https://kong.yearn.fi/api/gql

**Documentation:** https://docs.yearn.fi/developers/data-services/yearn-data

**References:**
- Documentation: https://docs.yearn.fi/developers/data-services/yearn-data
- GettingStarted: https://docs.yearn.fi/developers/data-services/yearn-data
- GitHubRepository: https://github.com/yearn/kong