Warblerlabs

Warbler Labs is a San Francisco fintech and blockchain company (founded 2020 by Blake West and Michael Sall) that builds and contributes to the Goldfinch Protocol, a decentralized credit protocol for real-world asset lending that provides stablecoin loans and yield generated by off-chain economic activity, and UID (Unique Identity), a KYC/KYB-compliant on-chain identity NFT. The public developer surface is the Goldfinch smart-contract system on Ethereum, an open-source monorepo (github.com/goldfinch-eng), a hosted GraphQL subgraph that indexes protocol state, and developer documentation at dev.goldfinch.finance. Security is central: every release is audited by external firms (CertiK, Trail of Bits) and the protocol runs a $500k Immunefi bug bounty.

Warblerlabs publishes 1 API on the APIs.io network. Tagged areas include Company, Blockchain, DeFi, Fintech, and Credit.

Warblerlabs’ developer surface includes documentation, API reference, engineering blog, and 12 more developer resources.

🌐 Visit website 📡 Source on GitHub

23.5/100 emerging ▬ flat Agent 13/100 agent aware Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

1 APIs

Company Blockchain DeFi Fintech Credit Lending GraphQL Ethereum Web3 Real World Assets Identity

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 23.5/100 · emerging

Contract Quality 8.0 / 25

Developer Ergonomics 5.7 / 20

Access Clarity 0.0 / 20

Operational Transparency 1.7 / 13

Contract Governance 0.5 / 12

Discoverability 7.6 / 10

Agent readiness — 13/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 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 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

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 github.com/api-evangelist/warblerlabs: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 1

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

Goldfinch Subgraph (GraphQL)

Public GraphQL subgraph that indexes useful state about the Goldfinch Protocol (senior pool, tranched pools, backers, borrowers, staked positions, membership) for use by the Gol...

Security Posture 2

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

Warblerlabs Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Warblerlabs Vulnerability Disclosure

disclosure policy published

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

Documentation 3

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

GraphQL

GraphQL

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

X-MCPServerCandidate

X-MCPServerCandidate

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

DataModel

DataModel

Conventions

Conventions

Conformance

Conformance

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 3

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

Security

Security

DomainSecurity

DomainSecurity

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: warblerlabs
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - none
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/warblerlabs.png
name: Warblerlabs
description: 'Warbler Labs is a San Francisco fintech and blockchain company (founded 2020 by Blake West and Michael Sall)
  that builds and contributes to the Goldfinch Protocol, a decentralized credit protocol for real-world asset lending that
  provides stablecoin loans and yield generated by off-chain economic activity, and UID (Unique Identity), a KYC/KYB-compliant
  on-chain identity NFT. The public developer surface is the Goldfinch smart-contract system on Ethereum, an open-source monorepo
  (github.com/goldfinch-eng), a hosted GraphQL subgraph that indexes protocol state, and developer documentation at dev.goldfinch.finance.
  Security is central: every release is audited by external firms (CertiK, Trail of Bits) and the protocol runs a $500k Immunefi
  bug bounty.'
url: https://raw.githubusercontent.com/api-evangelist/warblerlabs/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- kindred-ventures
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-21'
tags:
- Company
- Blockchain
- DeFi
- Fintech
- Credit
- Lending
- GraphQL
- Ethereum
- Web3
- Real World Assets
- Identity
tags_raw:
- Company
- Blockchain
- DeFi
- Fintech
- Credit
- Lending
- GraphQL
- Ethereum
- Web3
- Real-World Assets
- Identity
apis:
- name: Goldfinch Subgraph (GraphQL)
  description: Public GraphQL subgraph that indexes useful state about the Goldfinch Protocol (senior pool, tranched pools,
    backers, borrowers, staked positions, membership) for use by the Goldfinch Interface and any third party. Served over
    The Graph / Goldsky. Read-only, no authentication required.
  humanURL: https://dev.goldfinch.finance/docs/data/the_graph
  baseURL: https://api.goldsky.com/api/public/project_cmgz2qi2d003xxhp2eqgwfd5o/subgraphs/goldfinch-v2/annual_brown_worm/gn
  properties:
  - type: GraphQL
    url: graphql/goldfinch-subgraph-schema.graphql
  - type: APIReference
    url: https://dev.goldfinch.finance/docs/data/the_graph
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://warblerlabs.com/
- type: DeveloperPortal
  url: https://dev.goldfinch.finance/
- type: Documentation
  url: https://docs.goldfinch.finance/
- type: APIReference
  url: https://dev.goldfinch.finance/docs/data/the_graph
- type: GitHubOrganization
  url: https://github.com/goldfinch-eng
- type: Blog
  url: https://medium.com/warbler-labs
- type: LLMsTxt
  url: llms/warblerlabs-llms.txt
- type: GraphQL
  url: graphql/goldfinch-subgraph-schema.graphql
- type: DataModel
  url: data-model/warblerlabs-data-model.yml
- type: Conventions
  url: conventions/warblerlabs-conventions.yml
- type: Conformance
  url: conformance/warblerlabs-conformance.yml
- type: X-MCPServerCandidate
  url: mcp/warblerlabs-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list derived
    from the published API contracts, not an existing server. The scorer already read the manifest and reported mcp_server
    correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
- type: VulnerabilityDisclosure
  url: security/warblerlabs-vulnerability-disclosure.yml
- type: Security
  url: https://dev.goldfinch.finance/docs/security/bug-bounty/
- type: DomainSecurity
  url: security/warblerlabs-domain-security.yml
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 5
  pass: local-v1

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/warblerlabs"

All providers

curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/warblerlabs/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/warblerlabs/evidence"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.