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B20 Memos

by B20 payment memos in Markets & finance

x402 APIPassing, checked 5 h ago

Payment memos attached to B20 transfers: pairs each Memo(address,bytes32) log with its Transfer at the previous log index (same tx, same token). Give a tx hash for one transaction, or scan a block window. Returns memoHex always and memoText when printable UTF-8.

GET https://agent402.tools/api/b20-memos

Last 30 days

All checks passedSome failedAll failedNot checked
Uptime
100%
Response time
240 ms typical, 240 ms slowest 5%
Last check
5 h ago
Next check
any minute now

How to call it

# See the payment challenge (nothing is charged)
curl -i -X GET "https://agent402.tools/api/b20-memos?blocks=1000&token=0xb200000000000000000000000000000000000001"
import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { ExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client().register(
  "eip155:8453",
  new ExactEvmScheme(privateKeyToAccount(process.env.AGENT_KEY)),
);
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? Preflight it first for $0.005:
// GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fagent402.tools%2Fapi%2Fb20-memos
const res = await pay("https://agent402.tools/api/b20-memos?blocks=1000&token=0xb200000000000000000000000000000000000001");
console.log(await res.json());

Example input

{
  "blocks": 1000,
  "token": "0xb200000000000000000000000000000000000001"
}

Example output

{
  "count": 0,
  "fromBlock": 1,
  "memos": [],
  "mode": "window",
  "scannedFromBlock": 1,
  "toBlock": 2,
  "token": "0xb200…0001",
  "truncated": false
}

Security scan

  • No findings. We scan names, descriptions and tool definitions for hidden instructions and other prompt-injection patterns.

Recent checks

WhenResultHTTPTimePrice
5 h agoPassed402240 ms$0.005