Watsi

Watsi is a San Francisco-based 501(c)(3) nonprofit crowdfunding platform that lets donors directly fund surgeries and medical care for patients in low-income countries, working through vetted medical partners across Africa, Asia, and Latin America. Founded in 2011 and the first nonprofit funded by Y Combinator, Watsi has directed more than $20 million to patient healthcare. Watsi previously published a read-only JSON API at developers.watsi.org, but that developer portal and api.watsi.org no longer resolve, so no public API surface is currently available.

Watsi is profiled on the APIs.io network. Tagged areas include Company, Non-Profit, Healthcare, Crowdfunding, and Donations.

Watsi’s developer surface includes engineering blog, support, and 7 more developer resources.

🌐 Visit website 📡 Source on GitHub

11.9/100 emerging ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-08-20 · rubric v0.12.0

0 APIs

CompanyNon-ProfitHealthcareCrowdfundingDonationsGlobal Health

Kin Score

Kin Score How this is scored →
scored 2026-08-20 · rubric v0.12.0

Composite quality — 11.9/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 1.2 / 17

Access Clarity 3.6 / 17

Operational Transparency 0.6 / 11

Contract Governance 0.0 / 10

Discoverability 4.9 / 9

Regulatory Posture 2.6 / 15

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 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

Regulatory Posture applies to this provider. Its tags matched the Health 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.

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/.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/watsi: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

Build 2

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Packages

Packages

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: watsi
name: Watsi
description: Watsi is a San Francisco-based 501(c)(3) nonprofit crowdfunding platform that lets donors directly fund surgeries
  and medical care for patients in low-income countries, working through vetted medical partners across Africa, Asia, and
  Latin America. Founded in 2011 and the first nonprofit funded by Y Combinator, Watsi has directed more than $20 million
  to patient healthcare. Watsi previously published a read-only JSON API at developers.watsi.org, but that developer portal
  and api.watsi.org no longer resolve, so no public API surface is currently available.
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://avatars.githubusercontent.com/u/1034505?v=4
url: https://raw.githubusercontent.com/api-evangelist/watsi/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- y-combinator
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-21'
tags:
- Company
- Non-Profit
- Healthcare
- Crowdfunding
- Donations
- Global Health
tags_raw:
- Company
- Nonprofit
- Healthcare
- Crowdfunding
- Donations
- Global Health
apis: []
common:
- type: DomainSecurity
  url: security/watsi-domain-security.yml
- name: Website
  type: Website
  url: https://watsi.org
- name: Blog
  type: Blog
  url: https://blog.watsi.org/
- name: GitHub Organization
  type: GitHubOrganization
  url: https://github.com/Watsi
- name: Terms of Use
  type: TermsOfService
  url: https://watsi.org/terms
- name: Privacy Policy
  type: PrivacyPolicy
  url: https://watsi.org/privacy
- name: FAQ
  type: Support
  url: https://watsi.org/faq
- name: Packages
  type: Packages
  url: packages/watsi-packages.yml
- name: LLMs.txt
  type: LLMsTxt
  url: llms/watsi-llms.txt
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 4
  pass: local-v1