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OpenAPI Specification
openapi: 3.2.0
info:
title: Yearn Finance yDaemon REST Chains TVL API
description: The primary REST API for Yearn Finance, providing access to vault data, APY calculations, TVL metrics, strategy information, and protocol analytics across all supported EVM networks including Ethereum, Optimism, Polygon, Fantom, Base, and Arbitrum. Used by the production Yearn frontends.
version: 1.0.0
contact:
name: Yearn Finance
url: https://yearn.fi
license:
name: GNU Affero General Public License v3.0
url: https://github.com/yearn/ydaemon/blob/main/LICENSE
x-twitter: iearnfinance
servers:
- url: https://ydaemon.yearn.fi
description: Production yDaemon API
tags:
- name: TVL
description: Total Value Locked metrics
paths:
/{chainID}/vaults/tvl:
get:
operationId: getVaultsTVL
summary: Get total TVL for a chain
description: Returns the Total Value Locked (in USD) aggregated across all vaults on the specified chain.
tags:
- TVL
parameters:
- $ref: '#/components/parameters/chainID'
responses:
'200':
description: Total Value Locked as a numeric USD value.
content:
application/json:
schema:
type: number
format: double
description: Total Value Locked in USD across all vaults on the chain.
example: 181230031.34
'400':
$ref: '#/components/responses/BadRequest'
'404':
$ref: '#/components/responses/NotFound'
components:
responses:
BadRequest:
description: Bad Request - invalid parameters.
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
NotFound:
description: Not Found - the requested resource does not exist.
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
schemas:
Error:
type: object
properties:
error:
type: string
description: A human-readable error message.
example: not found
parameters:
chainID:
name: chainID
in: path
required: true
description: 'The EVM chain ID. Supported values: 1 (Ethereum), 10 (Optimism), 137 (Polygon), 250 (Fantom), 8453 (Base), 42161 (Arbitrum).'
schema:
type: integer
example: 1
enum:
- 1
- 10
- 137
- 250
- 8453
- 42161
externalDocs:
description: Yearn Finance Developer Documentation
url: https://docs.yearn.fi/developers/data-services/yearn-data