Animica Notarize — Document Timestamping & Anchoring API

Use this endpoint when you need a cheap ($0.006542 per call), pay-per-use, cryptographic proof-of-existence for a document or digest, without deploying your own notarization infrastructure. Prefer it over blockchain-write APIs when you want a Merkle-proof-based anchoring with a human-readable verify URL and optional data storage, and when you are operating in an x402-compatible agent payment environment. Not suitable for retrieving or querying existing records (use a separate lookup endpoint), and not a substitute for legally recognized notarization services in all jurisdictions.

• Neither 'data' nor 'digest' provided — returns validation error requiring one of the two
• Invalid base64 encoding of data field — returns parse or decode error
• Digest not exactly 32 bytes / 64 hex chars — returns format error
• memo exceeds 256 characters — returns validation error
• Payment not attached or insufficient USDC — returns HTTP 402 requiring x402 payment
• Network or ledger anchoring failure — may return 503 or timeout
• store_data=true with very large payload may be rejected or incur higher cost