Overview

If you need to fetch large amounts of historical yearn data, there are currently three services that can help you with that:

• Yearn Exporter (powers yearn.vision)
• Yearn Subgraph (GraphQL API)
• yDaemon (RESTful API, contains the subgraph and more)

Yearn Exporter

The exporter is used to build our Grafana dashboard at yearn.vision and contains handy historical TVL data. It provides:

• Source + Guide: https://github.com/yearn/yearn-exporter

Subgraph

The subgraph is a GraphQL interface to raw historical data. Check yDaemon before using the subgraph directly.

• Live API: https://api.thegraph.com/subgraphs/name/messari/yearn-v2-ethereum/graphql
• Docs: https://docs.yearn.finance/developers/v2/subgraph-info

yDaemon

yDaemon is a RESTful API that hydrates subgraph responses with more data, like APY calculations.

• Live API: https://ydaemon.yearn.finance/
• Source: https://github.com/yearn/ydaemon
• Docs: https://ydaemon.yearn.farm/
• Guide: https://medium.com/iearn/ydaemon-one-api-to-unify-all-yearn-data-4fc74dc9a33b

yDaemon Data Sources

To build the yDaemon API, data is fetched from several Yearn data sources:

• Yearn Subgraph as the base data source.
• Yearn Meta for some basic data and information updated by the Yearn team.
• Yearn API for the APY computation.
• Yearn Lens Oracle for tokens and vault prices.