x402.fairseal.io

Pay $0.01 for an instant verifiable random number backed by a Wesolowski VDF chain with on-chain Merkle anchor. For the free commit-reveal protocol: POST /v1/rng/commit (free), then GET the reveal_url returned — reveal is always free. Bias-resistant; do not construct reveal paths yourself.

Scan and redact PII from text before storing or sharing. Detects emails, phone numbers, credit cards (Luhn-checked), SSNs, IDs, passports, and IPv4 addresses. Returns sanitized text. Max 50,000 chars. Expect some false positives; non-North American phone formats not matched.

Create a tamper-proof on-chain record of any content hash. Submit a SHA-256 hash; returns a cryptographic proof of existence anchored to Base mainnet via Merkle batch. Poll status_url for verifiable receipt with on-chain tx hash. $0.02 USDC per anchor. Audit trail for AI decisions or documents.

Notarize an AI agent decision, audit record, or any payload to Base mainnet. Submit SHA-256 hash + metadata; get a tamper-proof verifiable receipt immediately. Merkle proof and on-chain anchor_tx available free after batch (~120s). Use Idempotency-Key to prevent double-charges on retry.

Verify and validate AI agent output integrity. Checks structure, SHA-256 hash, and optional cryptographic proof signature. Returns a per-check verdict. Accepts VEO-2 compliant output objects. Use to confirm an AI output has not been tampered with before acting on it.

Commit-before-entropy spot assignment for live card breaks, giveaways, and raffles. POST {spots[], participants[], label?} (1..500 strings, 1..100 chars each). Returns commitment immediately; poll result_url free for receipt with assignment, rule_hash, entropy, derivation steps, and offline verification guide.