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 is listed with 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 15 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

23.0/100 emerging ▬ flat Agent 13/100 agent aware Heartbeat 2/100 dormant Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

1 API

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

Kin Score

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

Composite quality — 23.0/100 · emerging

Contract Quality 6.3 / 21

Developer Ergonomics 4.9 / 17

Access Clarity 0.0 / 17

Operational Transparency 1.5 / 11

Contract Governance 0.5 / 10

Discoverability 6.2 / 9

Regulatory Posture 2.5 / 15

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

Pagination 5 / 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.

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.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% 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
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
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)
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
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

12 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 0.0 — up to +20.0 composite points
Contract Quality scores 29.8 — up to +17.6 composite points
Developer Ergonomics scores 28.6 — up to +14.3 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/warblerlabs/apis.yml: open an issue on github.com/api-evangelist/warblerlabs 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 →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Stablecoins and Tokenization (stablecoin issuers, tokenized assets)	undeclared	-	-	-
LF Decentralized Trust (Hyperledger) Members and Projects (enterprise blockchain, digital identity, CBDC)	undeclared	-	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

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.

GraphQL

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

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 2

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

GitHubOrganization

GitHubOrganization

Access & Security 3

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

Security

Security

DomainSecurity

DomainSecurity

Company 4

The organization behind the API

Website

Blog

Blog

Website

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:
  - security
  generated: '2026-11-06'
  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
- a16z
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-21'
x-docs-platform: docusaurus
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-17
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
- type: GitHubOrganization
  url: https://github.com/warbler-labs
- type: Blog
  url: https://goldfinch.substack.com/
- type: Website
  url: https://www.warblerlabs.com/
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 5
  pass: local-v1

Warblerlabs API — frequently asked questions

Does Warblerlabs have an API?

Yes. APIs.io lists 1 API from Warblerlabs, including Goldfinch Subgraph (GraphQL).

Is the Warblerlabs API ready for AI agents?

Warblerlabs has a Kin Score of 23.0 out of 100 (emerging) and an Agent Readiness score of 12.9 (agent-aware), scored by API Evangelist on 2026-11-06.

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