x402.fairseal.io

https://x402.fairseal.io/v1/rng/latest

Verifiable random numbers with cryptographic epoch references. Wesolowski 2048-bit VDF epoch chain with on-chain MerkleAnchor reference. For unbiased randomness: POST /v1/rng/commit (free), then GET the reveal_url returned in the response. Do not construct reveal paths yourself.

• 0.005 USD Coin / request · eip155:8453

https://x402.fairseal.io/v1/notarize

Anchor an AI agent decision or audit record to Base mainnet. Submit {schema, payload_hash (SHA-256 hex, 64 chars), metadata}; service queues into a Merkle batch and returns a receipt with pending_anchor status immediately. Full Merkle proof and on-chain anchor_tx available via free GET /v1/notarize/:receipt_id after batch anchors (within batch_threshold receipts or 120s). Include Idempotency-Key header to prevent double-charges on retry.

• 0.02 USD Coin / request · eip155:8453

https://x402.fairseal.io/v1/pii/detect

Regex-based PII scan: emails, US/Canada (NANP) phone numbers, dash-formatted national IDs (partial coverage; alphanumeric IDs such as Taiwan format are not matched), loose passport patterns, 64-hex crypto private keys (may also flag SHA-256 hashes), credit cards, US SSNs, IPv4 addresses. Always returns sanitized text with PII redacted. Max 50,000 chars. Expect false positives and missed matches.

• 0.001 USD Coin / request · eip155:8453

https://x402.fairseal.io/v1/veo/verify

Verify AI agent outputs against a VEO-2 schema. Checks structural validity, SHA-256 hash integrity (if content hash is present), and optional cryptographic signature on the output (if proof.provider_signature is present). Returns a verdict with per-check details.

• 0.002 USD Coin / request · eip155:8453