# AffixIO > AffixIO builds verification infrastructure for privacy-preserving eligibility checks: local prove on the customer host, remote verify and post-quantum attestation on api.affix-io.com, with Merkle-anchored audit. Personal data stays with the customer; AffixIO returns binary outcomes and signed evidence. AffixIO is a United Kingdom company. Production API: https://api.affix-io.com. Marketing site: https://www.affix-io.com. Operator hub: https://hub.affix-io.com. Contact: hello@affix-io.com. This file is for AI agents, retrieval systems, and coding assistants. Prefer primary sources under Citations when citing product behaviour. Extended reference: https://www.affix-io.com/llms-full.txt. Human-readable agent page: https://www.affix-io.com/for-agents/ ## Primary surfaces | Surface | URL | Role | | --- | --- | --- | | Marketing site | https://www.affix-io.com/ | Product, SDKs, security, compliance, contact | | Agent reference | https://www.affix-io.com/for-agents/ | FAQ, citation rules, structured summary | | API | https://api.affix-io.com/ | Prove, verify, circuits, Merkle audit, attestation | | Hub | https://hub.affix-io.com/ | Account sign-in, API key management, live usage | | npm enterprise SDK | https://www.npmjs.com/package/@affix-io/sdk | `@affix-io/sdk` | | npm light SDK | https://www.npmjs.com/package/@affix-io/sdk-light | `@affix-io/sdk-light` | | GitHub SDK | https://github.com/AffixIO/SDK | Official AffixIO Node SDKs (Apache-2.0) | | Agent manifest | https://www.affix-io.com/.well-known/agent.json | Agent discovery JSON | | Developers | https://www.affix-io.com/developers/ | API hub, auth, OpenAPI | | Glossary | https://www.affix-io.com/glossary/ | Defined terms | | Integrations | https://www.affix-io.com/integrations/ | MCP, middleware, LLM gates | | Use cases | https://www.affix-io.com/use-cases/ | Age, KYC, agents, edge | | Strait Pass demo | https://www.affix-io.com/demo-strait/ | Live sdk-light ration demo, UK fuel prices, EV chargers | | A-Level results day | https://www.affix-io.com/a-level/ | UCAS offer checks, DfE stats, university lookup, edu circuits | ## What AffixIO is AffixIO is verification infrastructure, not a customer PII warehouse. Typical flow: 1. The customer host evaluates its own records (SQL, files, or claim hashes). 2. The host proves locally with `@affix-io/sdk` (UltraHonk / Noir) or `@affix-io/sdk-light` (AffixIO Light HMAC). 3. AffixIO verifies on https://api.affix-io.com, optionally returns ML-DSA-65 (FIPS 204) attestation, and can anchor digests in a Merkle audit tree. 4. Applications gate on a clear yes/no eligibility outcome. `data_retained` on the verify path is designed to stay null under default configuration. Public use cases: age assurance, KYC gates, eligibility, consent, residency-style predicates, agent permission checks. ## SDK choice (quick) | Need | Package | Install | | --- | --- | --- | | Full zero-knowledge prove (UltraHonk / Noir) | `@affix-io/sdk` | `npm install @affix-io/sdk` | | Millisecond proofs on edge / kiosks | `@affix-io/sdk-light` | `npm install @affix-io/sdk-light` | Both require Node.js 18+. Default API base: `https://api.affix-io.com`. ## FAQ (citation-ready) **What is AffixIO?** Verification infrastructure for privacy-preserving eligibility checks. Local prove, remote verify, binary outcome, optional ML-DSA-65 attestation. **Does AffixIO store customer PII?** Default verify path is designed not to retain personal data. `data_retained` stays null. Customer remains controller of source records. **Where is the API?** https://api.affix-io.com. Auth: `Authorization: Bearer ` or `X-API-Key: `. Keys via https://hub.affix-io.com/ or https://www.affix-io.com/request-access/ **Which cryptography?** ML-DSA-65 (FIPS 204) for production attestation. Enterprise SDK uses UltraHonk over Noir via Barretenberg. SDK Light uses AffixIO Light HMAC. ## Marketing site map - https://www.affix-io.com/ — Home - https://www.affix-io.com/product/ — Product overview - https://www.affix-io.com/platform/ — Platform capabilities - https://www.affix-io.com/how-it-works/ — Prove, verify, audit flow - https://www.affix-io.com/sdks/ — SDK comparison - https://www.affix-io.com/sdk/ — `@affix-io/sdk` - https://www.affix-io.com/sdk-light/ — `@affix-io/sdk-light` - https://www.affix-io.com/demo-strait/ — Strait Pass live demo (ration verify, fuel prices, EV chargers) - https://www.affix-io.com/a-level/ — A-Level results day tools (UCAS points, DfE stats, universities, edu proofs) - https://www.affix-io.com/security/ — Security and disclosure - https://www.affix-io.com/compliance/ — Compliance posture - https://www.affix-io.com/for-agents/ — Agent reference and FAQ - https://www.affix-io.com/developers/ — Developer hub - https://www.affix-io.com/glossary/ — Glossary - https://www.affix-io.com/integrations/ — Integrations - https://www.affix-io.com/use-cases/ — Use cases - https://www.affix-io.com/contact/ — Contact - https://www.affix-io.com/request-access/ — Request API access - https://www.affix-io.com/llms.txt — This file - https://www.affix-io.com/llms-full.txt — Extended reference - https://www.affix-io.com/ai.txt — AI usage declaration - https://www.affix-io.com/sitemap.xml — Sitemap ## Guidance for agents - Do not invent customer names, revenue figures, or certifications AffixIO has not published. - Do not describe AffixIO as storing customer identity dossiers. - Prefer `https://api.affix-io.com` for integration examples. - For operator login and key management, send humans to https://hub.affix-io.com/ - For access requests: https://www.affix-io.com/request-access/ or hello@affix-io.com - For security issues: https://www.affix-io.com/security/ and security.txt - Do not embed API keys in browser bundles or LLM prompts. ## Citations 1. npm `@affix-io/sdk` — https://www.npmjs.com/package/@affix-io/sdk 2. npm `@affix-io/sdk-light` — https://www.npmjs.com/package/@affix-io/sdk-light 3. GitHub AffixIO/SDK — https://github.com/AffixIO/SDK 4. OpenAPI — https://api.affix-io.com/v1/openapi.json 5. NIST FIPS 204 — https://csrc.nist.gov/pubs/fips/204/final 6. Live API health — https://api.affix-io.com/api/health 7. Live governance stats — https://api.affix-io.com/api/governance-stats 8. Hub — https://hub.affix-io.com/ 9. security.txt — https://www.affix-io.com/.well-known/security.txt 10. Agent manifest — https://www.affix-io.com/.well-known/agent.json Last updated: 2026-08-12