Wren

Wren is a company surfaced as a portfolio company of union-square-ventures and added to the API Evangelist network as a stub for enrichment. This profile is a lead awaiting the enrichment pipeline.

Wren publishes 7 API contracts indexed on the APIs.io network, including Credits API, Offset Orders API, Portfolios API, and 4 more. Tagged areas include Company.

The Wren catalog on APIs.io includes 1 Spectral governance ruleset.

Wren’s developer surface includes engineering blog and 1 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

5.8/100 minimal ▬ flat Agent 22/100 agent aware Front door AI 1/6 silent Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

1 published contract

Company

Kin Score

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

Composite quality — 5.8/100 · minimal

Contract Quality 2.7 / 19

Developer Ergonomics 0.4 / 15

Access Clarity 0.0 / 15

Operational Transparency 0.0 / 10

Contract Governance 1.2 / 9

Discoverability 2.3 / 8

Regulatory Posture 0.0 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 22/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 7 / 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 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.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. 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
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
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
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)

10 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 14.4 — up to +21.4 composite points
Access Clarity scores 0.0 — up to +20.0 composite points
Developer Ergonomics scores 2.4 — up to +19.5 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/wren/apis.yml: open an issue on github.com/api-evangelist/wren 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 7

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

Wren Credits API

Manage the prepaid credit balance

Wren Offset Orders API

Create and list carbon offset orders by tonnage

Wren Portfolios API

List available portfolios and their projects

Wren Project Donations API

List non-offsettable project funding

Wren Project Orders API

Fund a specific project by dollar amount

Wren Purchases API

List purchase summaries with certificate URLs

Wren Tree Orders API

Create and list tree-planting orders

Scroll for all 7

Postman Collections 1

Ready-to-run Postman collections for exercising this provider's APIs.

Wren API

POSTMAN

Open Collections 7

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

Wren Credits API

OPEN COLLECTION

Wren Credits Offset Orders API

OPEN COLLECTION

Wren Credits Portfolios API

OPEN COLLECTION

Wren Credits Project Donations API

OPEN COLLECTION

Wren Credits Project Orders API

OPEN COLLECTION

Wren Credits Purchases API

OPEN COLLECTION

Wren Credits Tree Orders API

OPEN COLLECTION

Scroll for all 7

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Wren API Rules

65 rules · 59 errors 5 warnings 1 info

SPECTRAL

Resources

Company 2

The organization behind the API

Blog

Blog

Website

Website

Source (apis.yml)

aid: wren
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: true
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - openapi
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - sandbox
  - url: https://projectwren.com
    status: 301
    note: declared website redirects to https://www.wren.co/ — a different registrable domain (projectwren.com -> wren.co),
      possible rename or acquisition (probed 2026-09-03, roadmap#169)
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/wren.png
name: Wren
description: Wren is a company surfaced as a portfolio company of union-square-ventures and added to the API Evangelist network
  as a stub for enrichment. This profile is a lead awaiting the enrichment pipeline.
url: https://raw.githubusercontent.com/api-evangelist/wren/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- union-square-ventures
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-10-06'
tags:
- Company
apis:
- aid: wren:wren-credits-api
  name: Wren Credits API
  description: Manage the prepaid credit balance
  tags:
  - Credit
  tags_raw:
  - Credits
  properties:
  - type: OpenAPI
    url: openapi/wren-credits-api-openapi.yml
- aid: wren:wren-offset-orders-api
  name: Wren Offset Orders API
  description: Create and list carbon offset orders by tonnage
  tags:
  - Offset Orders
  properties:
  - type: OpenAPI
    url: openapi/wren-offset-orders-api-openapi.yml
- aid: wren:wren-portfolios-api
  name: Wren Portfolios API
  description: List available portfolios and their projects
  tags:
  - Portfolio
  tags_raw:
  - Portfolios
  properties:
  - type: OpenAPI
    url: openapi/wren-portfolios-api-openapi.yml
- aid: wren:wren-project-donations-api
  name: Wren Project Donations API
  description: List non-offsettable project funding
  tags:
  - Project Donations
  properties:
  - type: OpenAPI
    url: openapi/wren-project-donations-api-openapi.yml
- aid: wren:wren-project-orders-api
  name: Wren Project Orders API
  description: Fund a specific project by dollar amount
  tags:
  - Project Orders
  properties:
  - type: OpenAPI
    url: openapi/wren-project-orders-api-openapi.yml
- aid: wren:wren-purchases-api
  name: Wren Purchases API
  description: List purchase summaries with certificate URLs
  tags:
  - Purchases
  properties:
  - type: OpenAPI
    url: openapi/wren-purchases-api-openapi.yml
- aid: wren:wren-tree-orders-api
  name: Wren Tree Orders API
  description: Create and list tree-planting orders
  tags:
  - Tree Orders
  properties:
  - type: OpenAPI
    url: openapi/wren-tree-orders-api-openapi.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- url: https://www.wren.co/blog
  type: Blog
- type: Website
  url: https://projectwren.com

Wren API — frequently asked questions

Does Wren have an API?

Yes. APIs.io lists 7 APIs from Wren, including Wren Credits API, Wren Offset Orders API and Wren Portfolios API, and 4 more.

Is there an OpenAPI specification for the Wren API?

Yes. APIs.io indexes 7 OpenAPI specifications for Wren, each linked for download from this page.

How do I authenticate with the Wren API?

Wren uses bearer-token authentication.

Is the Wren API ready for AI agents?

Wren has a Kin Score of 5.8 out of 100 (minimal) and an Agent Readiness score of 21.8 (agent-aware), scored by API Evangelist on 2026-11-06.

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