Pricing

Per-namespace pricing — like domain registration. One namespace per publisher entity. Read-side API access is always free.

Open
Free
  • 1 namespace
  • Public COGs
  • Basic resolution
  • Annual aliveness check
  • Community support
Get Started
Professional
£149/year
  • Up to 3 namespaces
  • Everything in Open
  • Resolution analytics
  • Priority cache refresh
  • Email support
Subscribe
Business
£499/year
  • Up to 10 namespaces
  • Everything in Professional
  • Private & enterprise COGs
  • SLA (99.9% uptime)
  • Provenance badge
  • Priority support
Subscribe
Enterprise
Custom
  • Unlimited namespaces
  • Everything in Business
  • Dedicated instance
  • Custom SLA
  • API rate guarantees
  • Account manager
Contact Us
Read-side is always free. Any AI agent can query the registry, resolve namespaces, fetch pointer records, and check attestations — without authentication, without rate limits, without cost. Only publishers who register and maintain namespaces need a subscription.

API Rate Limits

TierRate LimitMonthly RequestsPrice
Free10/min1,000£0
Basic60/min10,000£12.50/year
Professional600/min100,000£99/year
EnterpriseUnlimitedCustomCustom

Five Compliance Levels

Not every document needs the same level of provenance. A company's internal wiki has different requirements than a pharmaceutical dosage reference.

LevelNameRequirementsUse Case
1 — BasicYAML present, publisher identifiedInternal documentationQuick-start adoption
2 — StructuredMX-compliant format, maintainer + contactPublic documentationProfessionalised content
3 — AttestedCryptographically attested, review cycle + triggersREGINALD minimumCommercial documentation
4 — RegisteredAttested + registered, full contract with SLAEnterprise documentationRegulated industries
5 — AuditedAttested + registered + third-party provenancedCritical documentationHealthcare, finance, legal

Level 3 is the minimum for REGINALD registration — the point where AI systems can trust the content programmatically. Level 5 is for industries where a wrong answer does not just waste tokens — it harms people.