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Sellat Qualified Timestamp – Issue eIDAS Proof
x402
Sellat Qualified Timestamp – Issue eIDAS Proof is a paid API for AI agents from sellat.app, paid per call via x402, $0.9/call, status unknown (last checked 2026-10-20).
Issues an EU eIDAS-qualified RFC 3161 electronic timestamp (.tsr) on a Sellat proof, legally demonstrating a file's existence at a specific point in time across the EU.
Price / call$0.9
Success—
StatusUnknown
How this service works
Prueba de existencia para tus archivos: demuestra que ya existían, con sello de tiempo cualificado y presunción legal en toda la UE.
Output
Returns a JSON object confirming the qualified timestamp was issued, including: the RFC 3161 UTC time, a URL to download the .tsr file, the issuing EU qualified trust service authority name, the policy OID (0.4.0.2023.1.1), the serial number, and the on-chain payment transaction hash on Base. The .tsr can be verified with any RFC 3161 tool (e.g. openssl ts -verify).
Example use cases
IP protection before patent filing
“I'm about to file a patent and I need to prove my invention existed before today — can you issue a Sellat qualified eIDAS timestamp for proof ID proof_7f3a92 so I have legally recognized evidence of its existence across the EU?”
Contract existence certification
“We signed a contract and I need an EU-legally-recognized timestamp proving it existed on today's date — please get a qualified RFC 3161 .tsr timestamp from Sellat for proof ID proof_44b810.”
Software release audit trail
“Before we push this release to production, I need a tamper-proof EU qualified timestamp certifying the exact moment this build existed — can you call Sellat and issue a qualified timestamp for proof ID proof_9c1de5?”
Technical details
Endpoint
POSThttps://sellat.app/api/v2/proofs/%7Bid%7D/qualified?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a legally recognized, EU eIDAS-qualified electronic timestamp — not just a blockchain hash. It's the right choice for regulatory compliance, legal proceedings, IP protection, or any scenario requiring a timestamp with legal presumption across EU member states. Prefer it over plain blockchain timestamping when eIDAS legal weight or RFC 3161 standard compatibility is required.
Side effects
- Invalid or non-existent proof_id returns an error
- Payment of 0.9 USDC not processed or wallet insufficient funds causes failure
- Qualified TSP (Trust Service Provider) temporarily unavailable
- Proof already has a qualified timestamp issued (duplicate request)
- Malformed request body causes 400 error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"verify": "openssl ts -verify -in <file>.tsr -data <file> (any RFC 3161 tool); the .tsr is downloaded with the wallet’s key",
"created": true,
"payment": {
"charged": true,
"amount_usd": "0.9",
"transaction": "<tx hash on Base>"
},
"proof_id": "<proof_id>",
"qualified": {
"time": "<RFC 3161 time, UTC>",
"state": "issued",
"tsr_url": "https://sellat.app/api/v2/proofs/<id>/qualified.tsr",
"authority": "<EU qualified trust service provider>",
"policy_oid": "0.4.0.2023.1.1",
"serial_number": "<token serial>"
}
}
}Tags
x402
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