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api.immuta.app seal
https://api.immuta.app/seal
payable
Notarize a document on-chain: permanent, independently verifiable proof that a SHA-256 hash existed at this moment. Send only the hash - the document never leaves your system. Returns a blockchain transaction receipt.
We sent a real
POST request to this endpoint and it
answered 402 with payment requirements we could parse.
- Price
- $1.00
- Network
- base
- Pay to
- 0xB60a3181303953E6F909ba4d3b09282BEefCDD6B
- Spec dialect
- v2 (declares x402Version 2)
- Transport
- PAYMENT-REQUIRED header
- HTTP method
- POST
- Response latency
- 303 ms
- Payment options
- 1 usable of 1
- Last checked
- 2026-08-10T09:11:22.786Z (1d ago)
- Category
- finance-crypto
Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fapi.immuta.app%2Fseal"