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.
#350
$0.02
19
8
Points earned against points available, biggest lever first.
| Rank | Service | Score | Volume | Price |
|---|---|---|---|---|
| #1 | 73 | 16.4K txns | $0.02 | |
| #2 | 68 | 51.3K txns | $0.01 |
| #3 | 62 | 15.9K txns | $0.05 |
| #4 | 62 | 43.8K txns | $0.01 |
| #5 | 61 | 3.1K txns | $0.0080 |