Vesper Finance

Vesper Finance is a DeFi yield aggregator that enables users to deposit assets into managed pools where yield strategies automatically optimize returns across decentralized finance protocols. The platform provides REST APIs for querying pool performance metrics, APY data, strategy information, VSP token statistics, and historical value-locked data across Ethereum, Polygon, Avalanche, and Optimism.

Vesper Finance publishes 6 API contracts indexed on the APIs.io network, including Pools API, Rates API, TVL API, and 3 more. Tagged areas include DeFi, Yield Aggregator, Liquidity Pools, APY, and Staking.

The Vesper Finance catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Vesper Finance’s developer surface includes documentation, engineering blog, and 13 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

22.7/100 emerging ▬ flat Agent 21/100 agent aware Front door AI 1/6 silent Heartbeat 53/100 alive open core · MIT Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreeOpen⚡ Free to try

1 published contract

DeFi Yield Aggregator Liquidity Pools APY StakingVSP TokenEthereum Polygon Avalanche Optimism

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 22.7/100 · emerging

Contract Quality 10.1 / 19

Developer Ergonomics 2.5 / 15

Access Clarity 0.8 / 15

Operational Transparency 0.3 / 10

Contract Governance 0.9 / 9

Discoverability 5.0 / 8

Regulatory Posture 1.6 / 15

Open Source Surface 0.0 / 10

Agent readiness — 21/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 9 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 4 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 0 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Open Source Surface applies to this provider. This product is open source and we read its repository directly, so Open Source Surface carries 10 points of the composite. It is scored from what the repository actually publishes — a security policy, a contribution guide, a release history, a code of conduct — read live from the provider rather than inferred from our own catalog pointers. This facet adds; nothing was taken away to make room for it. An open-source project is not excused from the commercial facets, because exemption would strip it of the points it does earn. If we have the wrong repository, or this product is not open source, say so on your provider repo and we will drop the facet rather than have you publish against it.

Create-or-Update Ergonomics does not apply to this provider. The published contracts declare no write operations, and a read-only API cannot create-or-update. The facet is excluded from this provider's denominator entirely — not scored zero. A reference or data API is not deficient for being unable to upsert.

The six quality facets above are damped to 75 points between them, because both conditional facets apply and carry 25 points together. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document

8 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Access Clarity scores 5.3 — up to +18.9 composite points
Developer Ergonomics scores 16.7 — up to +16.7 composite points
Operational Transparency scores 2.6 — up to +12.7 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/vesper/apis.yml: open an issue on github.com/api-evangelist/vesper to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

APIs 6

Individual APIs this provider publishes, each with its own machine-readable definition.

Vesper Contracts API Reference

Smart contract interface reference for Vesper pools, strategies, PoolAccountant, PoolRewards, and related on-chain components enabling direct DeFi integration via Web3.

Vesper Subgraph API

GraphQL subgraph for querying Vesper Finance on-chain events, pool history, strategy performance, and token metrics via The Graph protocol.

Vesper Finance Pools API

Vesper Grow Pool data and metadata

Vesper Finance Rates API

APY, APR, and lending rate data

Vesper Finance TVL API

Total value locked metrics

Vesper Finance VSP API

VSP token statistics and staking data

Open Collections 4

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

Vesper Finance Pools API

OPEN COLLECTION

Vesper Finance Pools Rates API

OPEN COLLECTION

Vesper Finance Pools TVL API

OPEN COLLECTION

Vesper Finance Pools VSP API

OPEN COLLECTION

GraphQL 1

GraphQL schemas published by this provider.

Vesper Finance GraphQL Subgraph

The Vesper Finance subgraph is deployed on The Graph protocol and provides a GraphQL API for querying on-chain pool data, revenue metrics, and token statistics for Vesper pools ...

GRAPHQL

Vesper Finance API pricing

Not yet checked against Vesper Finance's own pricing page. Compiled by API Evangelist; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Public Access	Free

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Plans

1 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Rate Limits

0 limits

RATE LIMITS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

Vesper Finance

SLA

FinOps 1

Cost, billing, and metering signals for API financial operations.

Finops

FINOPS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

context Context

19 classes · 31 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Vesper Finance — jsonschema rules

5 rules · 3 warnings 2 info

SPECTRAL

JSON Schema 6

Standalone JSON Schema definitions for this provider's data models.

DataPoint

6 properties

JSON SCHEMA

LoanRatesResponse

1 properties

JSON SCHEMA

Pool

13 properties

JSON SCHEMA

PoolDashboard

8 properties

JSON SCHEMA

ValueLocked

3 properties

JSON SCHEMA

VspStats

7 properties

JSON SCHEMA

Examples 2

Example request and response payloads for these APIs.

Getloanrates Response

1 fields

EXAMPLE

Getvspstats Response

7 fields

EXAMPLE

Security Posture 1

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Vesper Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Vesper Agentic Access

6 operations

6 operations · 0 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

PoolMetadata

PoolMetadata

Build 2

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

JavaScriptLibrary

JavaScriptLibrary

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 3

Status, limits, changes, and where to get help

RateLimits

RateLimits

IssueTracker

IssueTracker

Discord

Discord

Commercial 3

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

License

License

Company 3

The organization behind the API

Website

Website

Blog

Blog

Twitter

Twitter

Source (apis.yml)

name: Vesper Finance
description: Vesper Finance is a DeFi yield aggregator that enables users to deposit assets into managed pools where yield
  strategies automatically optimize returns across decentralized finance protocols. The platform provides REST APIs for querying
  pool performance metrics, APY data, strategy information, VSP token statistics, and historical value-locked data across
  Ethereum, Polygon, Avalanche, and Optimism.
deliveryModel:
  model: open-core
  license: MIT
  open_source: true
  commercial: true
  callable_host: true
  label: Open core · an OSS project plus a commercial hosted product
  confidence: high
  source:
  - license
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: free
  onboarding: open
  trial: false
  try_now: true
  public: true
  gated: none
  gated_source:
  - onboarding
  label: Free · Open access
  confidence: low
  source:
  - plans
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/vesper.png
url: https://raw.githubusercontent.com/api-evangelist/vesper/refs/heads/main/apis.yml
created: '2026-06-14'
modified: '2026-06-14'
specificationVersion: '0.23'
x-docs-platform: gitbook
x-docs-platform-confidence: high
x-docs-platform-checked: 2026-10-17
tags:
- DeFi
- Yield Aggregator
- Liquidity Pools
- APY
- Staking
- VSP Token
- Ethereum
- Polygon
- Avalanche
- Optimism
apis:
- name: Vesper Contracts API Reference
  description: Smart contract interface reference for Vesper pools, strategies, PoolAccountant, PoolRewards, and related on-chain
    components enabling direct DeFi integration via Web3.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://docs.vesper.finance/vesper-developers/vesper-contracts-api-reference
  baseURL: https://api.vesper.finance
  tags:
  - Smart Contracts
  - Web3
  - ERC-20
  - DeFi
  tags_raw:
  - Smart Contracts
  - Web3
  - ERC20
  - DeFi
  properties:
  - type: Documentation
    url: https://docs.vesper.finance/vesper-developers/vesper-contracts-api-reference
  - type: GitHubRepository
    url: https://github.com/vesperfi/vesper-contracts
  contact:
  - FN: Vesper Finance
    url: https://vesper.finance/
- name: Vesper Subgraph API
  description: GraphQL subgraph for querying Vesper Finance on-chain events, pool history, strategy performance, and token
    metrics via The Graph protocol.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://github.com/vesperfi/vesper-subgraph
  baseURL: https://api.thegraph.com/subgraphs/name/vesperfi
  tags:
  - GraphQL
  - Subgraph
  - The Graph
  - Historical Data
  properties:
  - type: Documentation
    url: https://github.com/vesperfi/vesper-subgraph
  - type: GitHubRepository
    url: https://github.com/vesperfi/vesper-subgraph
  - url: graphql/vesper-graphql.md
    type: GraphQL
  contact:
  - FN: Vesper Finance
    url: https://vesper.finance/
- aid: vesper:vesper-pools-api
  name: Vesper Finance Pools API
  description: Vesper Grow Pool data and metadata
  humanURL: https://docs.vesper.finance/vesper-developers/vesper-developers-guide
  baseURL: https://api.vesper.finance
  tags:
  - Pools
  properties:
  - type: OpenAPI
    url: openapi/vesper-pools-api-openapi.yml
  - type: Documentation
    url: https://docs.vesper.finance/vesper-developers/vesper-developers-guide
  - type: GitHubRepository
    url: https://github.com/vesperfi/doc
  - type: Plans
    url: https://raw.githubusercontent.com/api-evangelist/vesper/refs/heads/main/plans/plans.yml
  - type: RateLimits
    url: https://raw.githubusercontent.com/api-evangelist/vesper/refs/heads/main/rate-limits/rate-limits.yml
  - type: FinOps
    url: https://raw.githubusercontent.com/api-evangelist/vesper/refs/heads/main/finops/finops.yml
- aid: vesper:vesper-rates-api
  name: Vesper Finance Rates API
  description: APY, APR, and lending rate data
  humanURL: https://docs.vesper.finance/vesper-developers/vesper-developers-guide
  baseURL: https://api.vesper.finance
  tags:
  - Rates
  properties:
  - type: OpenAPI
    url: openapi/vesper-rates-api-openapi.yml
  - type: Documentation
    url: https://docs.vesper.finance/vesper-developers/vesper-developers-guide
  - type: GitHubRepository
    url: https://github.com/vesperfi/doc
  - type: Plans
    url: https://raw.githubusercontent.com/api-evangelist/vesper/refs/heads/main/plans/plans.yml
  - type: RateLimits
    url: https://raw.githubusercontent.com/api-evangelist/vesper/refs/heads/main/rate-limits/rate-limits.yml
  - type: FinOps
    url: https://raw.githubusercontent.com/api-evangelist/vesper/refs/heads/main/finops/finops.yml
- aid: vesper:vesper-tvl-api
  name: Vesper Finance TVL API
  description: Total value locked metrics
  humanURL: https://docs.vesper.finance/vesper-developers/vesper-developers-guide
  baseURL: https://api.vesper.finance
  tags:
  - TVL
  properties:
  - type: OpenAPI
    url: openapi/vesper-tvl-api-openapi.yml
  - type: Documentation
    url: https://docs.vesper.finance/vesper-developers/vesper-developers-guide
  - type: GitHubRepository
    url: https://github.com/vesperfi/doc
  - type: Plans
    url: https://raw.githubusercontent.com/api-evangelist/vesper/refs/heads/main/plans/plans.yml
  - type: RateLimits
    url: https://raw.githubusercontent.com/api-evangelist/vesper/refs/heads/main/rate-limits/rate-limits.yml
  - type: FinOps
    url: https://raw.githubusercontent.com/api-evangelist/vesper/refs/heads/main/finops/finops.yml
- aid: vesper:vesper-vsp-api
  name: Vesper Finance VSP API
  description: VSP token statistics and staking data
  humanURL: https://docs.vesper.finance/vesper-developers/vesper-developers-guide
  baseURL: https://api.vesper.finance
  tags:
  - VSP
  properties:
  - type: OpenAPI
    url: openapi/vesper-vsp-api-openapi.yml
  - type: Documentation
    url: https://docs.vesper.finance/vesper-developers/vesper-developers-guide
  - type: GitHubRepository
    url: https://github.com/vesperfi/doc
  - type: Plans
    url: https://raw.githubusercontent.com/api-evangelist/vesper/refs/heads/main/plans/plans.yml
  - type: RateLimits
    url: https://raw.githubusercontent.com/api-evangelist/vesper/refs/heads/main/rate-limits/rate-limits.yml
  - type: FinOps
    url: https://raw.githubusercontent.com/api-evangelist/vesper/refs/heads/main/finops/finops.yml
common:
- type: Plans
  url: plans/plans.yml
- type: RateLimits
  url: rate-limits/rate-limits.yml
- type: FinOps
  url: finops/finops.yml
- type: IssueTracker
  url: https://github.com/vesperfi/vesper-contracts/issues
- type: License
  name: MIT
  url: https://github.com/vesperfi/vesper-contracts/blob/main/LICENSE
- type: AgenticAccess
  url: agentic-access/vesper-agentic-access.yml
- type: DomainSecurity
  url: security/vesper-domain-security.yml
- type: Website
  url: https://vesper.finance/
- type: Documentation
  url: https://docs.vesper.finance/
- type: GitHubOrganization
  url: https://github.com/vesperfi
- type: JavaScriptLibrary
  url: https://github.com/vesperfi/lib-js
- type: Blog
  url: https://medium.com/vesperfinance
- type: Discord
  url: https://discord.gg/vesperfinance
- type: Twitter
  url: https://twitter.com/VesperFi
- type: PoolMetadata
  url: https://github.com/vesperfi/metadata
maintainers:
- FN: API Evangelist
  url: https://apievangelist.com
  email: info@apievangelist.com

Vesper Finance API — frequently asked questions

Does Vesper Finance have an API?

Yes. APIs.io lists 6 APIs from Vesper Finance, including Vesper Contracts API Reference, Vesper Subgraph API and Vesper Finance Pools API, and 3 more.

Is there an OpenAPI specification for the Vesper Finance API?

Yes. APIs.io indexes 4 OpenAPI specifications for Vesper Finance, each linked for download from this page.

How much does the Vesper Finance API cost?

APIs.io lists 1 pricing plan for Vesper Finance, with each plan's price, limits and inclusions under Pricing on this page.

Is the Vesper Finance API ready for AI agents?

Vesper Finance has a Kin Score of 22.7 out of 100 (emerging) and an Agent Readiness score of 21.1 (agent-aware), scored by API Evangelist on 2026-11-06.

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