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Credits power verification. Payer is always server-derived. You choose: self-pay, sponsor, or x402. NEUS uses a unified credit system for verification and gating. Payer identity is always server-derived; clients never dictate who pays.

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Payer Resolution

The server resolves the payer in this order (first match wins):
  1. x402 receipt — Pay-per-use when credits are exhausted
  2. Sponsor grant — App-sponsored verifications (X-Sponsor-Grant header)
  3. Gate billing — Gate creator pays
  4. Signature — User self-pay (wallet-signed request)
  5. No payer — Public demo cap (limited free usage)
Payer identity is never trusted from the request body. It is validated via cryptographic signature or receipt.

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Credit Pricing

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Verification Request

  • Base: 1 credit (gate check)
  • Verifier costs: Vary by verifier (see catalog)
  • Persistence: +2 credits (if persist=true)
  • IPFS: +20 credits (if ipfs=true or pin=true)
  • Extra chains: +10 credits per additional chain

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Gate Check

  • Base: 1 credit
  • Extra verifiers: +1 credit per additional verifier
  • Public demo cap: Free up to 50 results (no payer required)

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Status Check

  • Cost: Free (0 credits)

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Payment Methods

Apps can sponsor verifications for their users.
  • Header: X-Sponsor-Grant: <jwt>
  • Use case: Onboarding where the app covers verification cost

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User Self-Pay

Users pay with their own credit balance via signed requests.

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x402 (Pay-Per-Use)

When credits are exhausted, the API returns 402 Payment Required with a quote. The client can pay via crypto and retry with the receipt.
  • Header: PAYMENT-SIGNATURE: <receipt>
  • Use case: One-off usage without pre-loading credits

x402 Pay-Per-Use

Full guide: quote, pay, retry with receipt.

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Credit Packages

PackageCreditsPriceUse Case
Public1,000/monthFreeTesting and proof creation
Pro50,000/month$99.99/monthProduction apps
EnterpriseCustomContactHigh-volume, custom SLAs
Credits reset each month (no rollover). x402 handles overflow when credits are exhausted.

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Pro Upgrade

  • Price: $99.99/month
  • Credits: 50,000 per month
  • Checkout: Card payment via Hub (Profile → Credits → Upgrade)
  • Top-ups: Separate from subscription; managed in Credits tab

Hub

Upgrade from Profile → Credits.

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Public vs Private

  • Public proofs: Anyone can check via /api/v1/proofs/check (no auth required)
  • Private proofs: Owner-only access; requires authenticated session or owner signature
Billing is the same for both; access control is separate from payment.