Immuta Seal - On-Chain Document NotarizationPOST /seal · x402 API by Immuta
On-chain notarization for documents and data. Send a SHA-256 hash; receive a permanent, timestamped, independently verifiable blockchain record proving the content existed at this moment - plus a downloadable PDF Certificate of Existence. The document itself never leaves your system; only the hash is transmitted. Use for contracts, agreements, audit trails, IP protection, compliance records, and AI-output provenance. Anyone can verify a seal without trusting this service. $1.00 per seal, paid via x402 in USDC on Base.
What does this x402 API do?
Immuta Seal - On-Chain Document Notarization. This is an x402-gated POST API resource from Immuta. TOLL·402 did not invoke this route automatically because doing so was not considered safe. No normalized USD price is recorded; the listing names Base. No settled paid call has been verified.
- Published price
- No normalized USD price is recorded
- Networks
- Base
- Latest evidence
- TOLL·402 did not invoke this route automatically because doing so was not considered safe
- Resource ID
- 6117e945411ed72aaf18711b
Start with a quote-only recipe. Payment signing stays in your project.
const response = await fetch("https://api.immuta.app/seal", {
method: "POST",
headers: { "content-type": "application/json" },
body: JSON.stringify({
"replace": "with provider-approved input"
}),
});
console.log(response.status);
console.log(Object.fromEntries(response.headers));
console.log((await response.text()).slice(0, 1000));
// A valid 402 is a quote, not a completed paid call.Review the provider input schema before running this non-read-only method. No payment code is included.
- Observed in 402-index
Discovered through bazaar.
- Registry record checked
Registry health: healthy.
- Exact route checked
not safely testable · potentially-mutating-method:POST
- Origin reachable
OPTIONS https://api.immuta.app/ returned 405.
What evidence supports this listing?
Each record has an exact-route quote outcome. Unresolved templates and potentially mutating methods are labeled instead of being invoked without provider-specific test input. A quote is still separate from a settled paid call. Read the discovery and verification methodology →
Which networks and payment options does it accept?
The normalized listing price is No normalized USD price is recorded. Raw protocol requirements remain visible below for implementation and audit use.