api.affix-io.com
Production verify, prove, Merkle, and attestation traffic.
Start with 100 free AffixIO proofs
New eligible Hub account holders can claim one allocation of 100 free SDK proofs. No card required. Use them to test SDK proofs, agent verification, agentic payment checks and transaction intent proof workflows.
See the free proof offerDevelopers
Production API and SDK entry points.
Everything you need to authenticate, prove locally, and sync to api.affix-io.com.
Bearer or X-API-Key
Prefixes: aio_, demo_, affix_. Keys from Hub or contact AffixIO.
OpenAPI
Live schema at /v1/openapi.json.
Quick start
- Request an API key at /contact/ or sign in at hub.affix-io.com.
- Install affixio or affixio (Node.js 18+).
- Point the SDK at https://api.affix-io.com with your key.
- Prove locally, sync for verify and ML-DSA-65 attestation.
Health and governance
- GET /api/health — service status and circuit catalogue
- GET /api/governance-stats — Merkle leaf counts and root
- GET /v1/openapi.json — OpenAPI schema
npm packages
npm install affixionpm install affixioDeveloper questions
API base, auth, packages, and limits.
What is the AffixIO API base URL?
https://api.affix-io.com for production. Health check: GET /api/health. OpenAPI: GET /v1/openapi.json.
How do I authenticate API requests?
Authorization: Bearer <key> or X-API-Key: <key>. Prefixes include aio_, demo_, and affix_. Contact AffixIO for keys at https://www.affix-io.com/contact/ or manage them at https://hub.affix-io.com/.
What rate limits apply?
Public documentation cites about 10 requests per second per key unless contracted otherwise.
Which npm packages should developers install?
affixio for UltraHonk ZK prove. affixio for millisecond proofs. Both Apache-2.0 on npm with source at https://github.com/AffixIO/SDK.