What the provider says
Timestamp and notarize any file or data by its SHA-256 hash: blockchain proof of existence and document integrity, anchored on Polygon in minutes and attested on Bitcoin (OpenTimestamps); blockchain notarization, not a notary act. Returns proof_id, certificate, proof.json and evidence ZIP, verifiable without Sellat. Use when you must prove that exact data existed by now and is intact.
Quoted from x402 Bazaar
· source record
· read 2026-10-26
Facts and where they come from
- Price
-
0.01 USDC per call
Provider claim
Recorded value: 0.9 USDC per call.
- Unit
- per call
- Protocol
-
x402, REST
· transport: HTTP
Provider claim
- Auth
- x402
- Last checked
-
Not checked by us yet — the data is as the source published it
- First seen
- 2026-10-24
- Usage
-
7 calls
· 2 unique payers
in the 30 days before 2026-10-24.
Measured by the x402 Bazaar, not by us and not by the provider.
Payments and earnings
Verified earnings · 30d
Unknown
Measured days
0/30
Settled payments
—
Ledger computed
never
No settled payment on record. Earnings for this service are unknown — not zero.
The source counts 7 calls in 30 days, which at the
published price is roughly $0.07 of
activity. Activity is not revenue; no charge has been reconciled for it.
Payment rails
Base
· exact · USDC
0xEC7c3Bbf17352aF760f2D89B0170477DaC5ae25D
0.9 USDC
From source record
Base
· exact · USDC
0xeDeb27856FfB8c313931B2DCE0f8375F27f4d87a
0.01 USDC
From source record
A payment rail is where the provider asks to be paid. It is not proof that anything was paid
through it. See evidence levels.
Input and output, as published
Request
{
"body": {
"hash": "e997f7977eed77c6f5a3ef7b5934ede33023d6d4991cccbad486b835a2509c6c",
"metadata": {
"ref": "optional"
},
"name": "sellat-example-20261024030954-25ea26b8.txt"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Response
{
"example": {
"anchoring": {
"policy": "fast"
},
"api_key": "<shown once: read-only key for this wallet\u2019s proofs>",
"created": true,
"hash": "<sha256>",
"id": "<proof_id>",
"next": "POST /api/v2/proofs/{id}/qualified adds the eIDAS qualified timestamp (RFC 3161) for 0.90 USD",
"payment": {
"amount_usd": "0.01",
"charged": true,
"transaction": "<tx hash on Base>"
},
"proof_id": "<proof_id: use it in POST /api/v2/proofs/{id}/qualified>",
"state": "queued \u2192 anchored (minutes)",
"urls": {
"certificate": "https://sellat.app/certificate/<id>",
"evidence_zip": "https://sellat.app/api/v2/proofs/<id>/evidence.zip",
"proof_json": "https://sellat.app/api/v2/proof/<id>.json",
"self": "https://sellat.app/api/v2/proofs/<id>"
}
},
"type": "json"
}
Examples are the provider's own, not a call we made.
Provenance
One row per statement. “Verified” means we checked it ourselves and the finding is quoted.
“Provider claim” means we read it in the provider's own record. “Not found” is a statement about
our search, not proof of absence.
| Statement |
Status |
What we found |
Source |
Checked |
|
Endpoint
|
Provider claim |
https://sellat.app/api/v2/proofs/:id/qualified
Evidence
Als Resource-URL im Bazaar-Eintrag geführt.
|
api.cdp.coinbase.com
|
2026-10-26 |
|
Input output
|
Provider claim |
Request/response examples published with the listing
Evidence
Beispiel-Ein- und -Ausgabe stammen aus dem Bazaar-Eintrag des Anbieters.
|
api.cdp.coinbase.com
|
2026-10-26 |
|
Payment
|
Provider claim |
1 rail: Base · payee 0xEC7c3Bbf17352aF760f2D89B0170477DaC5ae25D
Evidence
Aus den `accepts`-Einträgen: Netzwerk, Asset, Empfängeradresse und Betrag. Die Adresse ist die Grundlage der späteren On-Chain-Zuordnung; sie ist noch nicht durch eine eigene 402-Antwort bestätigt.
|
api.cdp.coinbase.com
|
2026-10-26 |
|
Pricing
|
Provider claim |
0.9 USDC per call
Evidence
Atomic amount 900000 = 0.9 USDC per call on Base. Netzwerk: Base.
|
api.cdp.coinbase.com
|
2026-10-26 |
|
Protocol
|
Provider claim |
x402 (HTTP 402 payment challenge)
Evidence
Im x402 Bazaar als zahlungspflichtige HTTP-Ressource gelistet (x402Version 2, Typ http).
|
api.cdp.coinbase.com
|
2026-10-26 |
|
Provider
|
Provider claim |
sellat.app
Evidence
Die Ressource wird unter diesem Host im x402 Bazaar geführt; die Angaben stammen vom Anbieter.
|
api.cdp.coinbase.com
|
2026-10-26 |
|
Usage
|
Verified |
3 calls / 1 unique payers in the last 30 days
Evidence
Source-reported usage from Coinbase x402 Bazaar, read on 2026-10-26. Letzter Aufruf laut Quelle: 2026-10-19T06:53:16.673Z. Aufrufe sind kein Umsatz.
|
api.cdp.coinbase.com
|
2026-10-26 |
Endpoint checks
We have not called this endpoint yet. Until we do, everything above is what the source
published — no more.
Tags