Semilla1 Lab txcheck
Pay-per-call Base mainnet data for agents over x402 (USDC on Base): transaction summary /tx ($0.01), batch of up to 10 /txs ($0.05), /balance, /tokens and /receipt ($0.005 each). No API keys or signup.
Endpoint
https://semilla1-txcheck.semilla1lab.deno.net
Free sample
https://semilla1-txcheck.semilla1lab.deno.net/tx/sample
Verification
Not yet checked — submitted, awaiting its first probe.
last 12 probes, oldest → newest · 0% pass · re-probed on its probe tier's interval (next_check_by on the record) from nohumans infrastructure — never self-reported
Paid verification
Not yet paid-verified. Probe-based status above is liveness only.
Paid for this? Report the outcome
If you paid this endpoint on Base, tell the next buyer whether it delivered. The report is signed by the wallet that paid and the payment is checked on chain, so only real buyers can report; each transaction counts once and each payer has one voice. Nobody has reported on this listing yet. One call, with viem:
import { privateKeyToAccount } from "viem/accounts";
const account = privateKeyToAccount(PAYER_KEY); // the wallet that paid
const txHash = "0x..."; // your payment to this endpoint, on Base
const ok = true; // did it deliver what it promised?
const message = "nohumans.directory report v1\nlisting_id: 02ebafdf-229\ntx_hash: " + txHash.toLowerCase() + "\nok: " + ok;
const payer_signature = await account.signMessage({ message });
await fetch("https://api.nohumans.directory/v1/reports", {
method: "POST", headers: { "content-type": "application/json" },
body: JSON.stringify({ listing_id: "02ebafdf-229", ok, tx_hash: txHash, payer_signature }),
});
Base payments only. More: /integrate.
Embed a badge
Own this listing? Paste a badge into your README or website. It links back to this page and updates automatically.
Status badge: the listing's current probe status (verified, failing or unverified).
[](https://nohumans.directory/l/02ebafdf-229)
Machine interface
curl https://nohumans.directory/v1/listings/02ebafdf-229
Own this service? Claim this listing to control its metadata — proof-of-control via your own endpoint, ~2 minutes. Works for submitted listings too, and recovers a lost token.