Per-call validation fees. From $0.005 USDC per call for checksum validators; higher for on-chain checks and premium tiers. First 3 calls per day are free (no wallet needed). Live prices are quoted by the machine surface at https://hcrb.in/health — that quote, not this page, is authoritative.
Plans and one-off engagements
Need API checks only? Start with 1,000 checks for $1. Compare all current quotas, included features and roadmap items before choosing an Assurance plan. Monthly USDC access requires a new payment to renew; it does not create an automatic debit.
| Offer | Price | Included | Next step |
|---|---|---|---|
| Assurance Pilot | $499one-off | One corridor, 9,800 checks over 30 days. Receipt archive, verify links and batch-50 API. | View payment options |
| Assurance Desk | $499/month | One corridor, 3,000 checks/month. Receipt archive and batch-50 API. Failure digest email is planned, not included. | View payment options |
| Desk Plus | $1,500/month | All corridors, 30,000 checks/month. Batch API and receipt archive. Webhook callbacks and five sub-account keys are planned, not included. | View payment options |
| Conformance Audit | $2,500one-off | Public 100-point x402 suite, prioritized remediation list and one re-audit. Additional re-audits: $500 per engagement. | View payment options |
Self-serve payments accept card (Stripe) or USDC on Base. For purchase orders or NET-30 terms, request an invoice; scope and terms are agreed before work starts.
Monthly verification desks, a one-off pilot and a one-off conformance audit are offered for teams — see Assurance for scope and terms.
Settlement fees. None taken by us: payment moves payer-to-seller directly on Base via gasless EIP-3009. Network/facilitator costs, if any, are set by those parties.
Receipts. Every result includes a signed XDR-1 receipt at no separate charge.
Human-readable summary only. The machine quote on https://hcrb.in always governs.