Soren · Attestation

by Soren

GETBasebase

$0.02

per call · USD Coin on Base

A signed, timestamped statement that a specific SHA-256 was presented to Soren at a given moment. Use it when a counterparty must check that your output existed by then. You send only the hash — we never receive your content, so there is nothing to leak or be compelled to produce. An agent signing its own output proves nothing to anyone else. Not a legal notarisation, not proof of authorship, not proof it existed earlier. Verify with soren.com/oracle-key.json

Endpoint

GET https://soren.com/v1/attestation

4

Calls / 30d

1

Unique payers / 30d

Sep 8

Last called

exact

Payment scheme

Call this service

TypeScript · @x402/fetch
import { wrapFetchWithPayment } from "@x402/fetch";
import { privateKeyToAccount } from "viem/accounts";

const account = privateKeyToAccount(process.env.PRIVATE_KEY);
const fetchWithPay = wrapFetchWithPayment(fetch, account);

const res = await fetchWithPay("https://soren.com/v1/attestation", {
  method: "GET",
});
const data = await res.json();
cURL
curl -X GET \
  "https://soren.com/v1/attestation?hash=e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855&note=model+output+v3" \
  -H "X-PAYMENT: <signed x402 payment>"

Example response

{
  "attested": true,
  "hash": "<64 hex>",
  "observed_at": "<ISO-8601 UTC>",
  "signature": {
    "algorithm": "Ed25519",
    "value": "<base64>"
  },
  "statement": "attestation|<hash>|<observed_at>"
}

Payment details

Pay to0xadc3a47efbd82ed724a0e9a3d08d5a1a8e6586fd
AssetUSD Coin · 0x833589fcd6edb6e08f4c7c32d4f71b54bda02913
NetworksBase, base
Schemesexact

Is this your API?

Pin it to the top of Social & Community and the homepage with a featured placement.

Get featured →

More from Soren & similar services

Soren · Free Games

soren.com

Every PC game currently free to KEEP (claim once, own permanently) across Steam, Epic Games Store, GOG and itch.io. Each entry verified against that store's own API before publication. Per-store status distinguishes "verified: nothing is free" from "could not check", so a zero is a fact rather than an absence of data. Self-verifying: the version field is a SHA-256 of the payload's own content.

GETBaseGames & Fun
$0.02 / call7 calls / 30d

Soren · AI Judge

soren.com

A neutral, SIGNED verdict on whether a deliverable meets stated criteria, or which of two candidates is better. Neither party to an A2A transaction can referee it — this is a party with no stake, signing over the SHA-256 of the exact bytes judged. Identical inputs return the identical verdict for 30 days, so verdict-shopping is impossible. Fix criteria first with /v1/commit. Charged only if a verdict is produced.

POSTBaseAI & Inference
$0.05 / call6 calls / 30d

Soren · Paid Ping

soren.com

A heartbeat that costs money, and therefore proves more than a health check: not merely that the server answers, but that x402 verification and settlement are working right now, end to end. Suitable for a monitor that needs to know the PAID path is alive.

GETBaseDeveloper Tools
$0.01 / call5 calls / 30d