ToolVet
17trust / 100

Letters Ltr 6efe036558965c36

by MailPulse in Email & messaging

x402 APIFailing, checked 3 h ago

Check the status and tracking of a physical letter previously sent via POST /api/letters. Returns render status, expected delivery date, and (for certified mail) the USPS tracking number.

POST https://mailpulse.theaslangroupllc.com/api/letters/ltr_6efe036558965c36

Last 30 days

All checks passedSome failedAll failedNot checked

Status and outage history · Atom feed

Uptime
0.0%
Response time
- typical, - slowest 5%
Last check
3 h ago: Amount "0.005" is not in atomic token units
Next check
any minute now

How to call it

POST https://mailpulse.theaslangroupllc.com/api/letters/ltr_6efe036558965c36

Each call costs $0.005 in USDC on Base, paid with the request over x402.

Run a free test callOne unpaid request, the way an agent sends it. You see the payment challenge it gets back. Nothing is charged.

Example request

From the listing.

POST https://mailpulse.theaslangroupllc.com/api/letters/ltr_6efe036558965c36
content-type: application/json

{}

Example response

The provider's example. We can't check it without paying.

{
  "carrier": "USPS",
  "expected_delivery_date": "2026-07-23",
  "id": "ltr_...",
  "mode": "test",
  "status": "rendered",
  "tracking_number": null
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.005.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://mailpulse.theaslangroupllc.com/api/letters/ltr_6efe036558965c36' \
  -H 'content-type: application/json' \
  --data-raw '{}'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - -X POST 'https://mailpulse.theaslangroupllc.com/api/letters/ltr_6efe036558965c36' \
  -H 'content-type: application/json' \
  --data-raw '{}' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode
JavaScript: pay and call
// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.005 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.005" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.005 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fmailpulse.theaslangroupllc.com%2Fapi%2Fletters%2Fltr_6efe036558965c36&method=POST
const res = await pay("https://mailpulse.theaslangroupllc.com/api/letters/ltr_6efe036558965c36", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({}),
});
console.log(res.status, await res.text());
Python: pay and call
# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.005 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.005"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://mailpulse.theaslangroupllc.com/api/letters/ltr_6efe036558965c36",
        json={},
    )
    print(res.status_code, res.text)

Security scan

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

Recent checks

WhenResultHTTPTimePrice
3 h agoAmount "0.005" is not in atomic token units402285 ms$0.005
8 h agoAmount "0.005" is not in atomic token units402432 ms$0.005
12 h agoAmount "0.005" is not in atomic token units402400 ms$0.005
17 h agoAmount "0.005" is not in atomic token units402232 ms$0.005
21 h agoAmount "0.005" is not in atomic token units402415 ms$0.005
25 h agoAmount "0.005" is not in atomic token units402306 ms$0.005
30 h agoAmount "0.005" is not in atomic token units402240 ms$0.005
34 h agoAmount "0.005" is not in atomic token units402308 ms$0.005
38 h agoAmount "0.005" is not in atomic token units402197 ms$0.005
42 h agoAmount "0.005" is not in atomic token units402187 ms$0.005
46 h agoAmount "0.005" is not in atomic token units402211 ms$0.005
2 days agoAmount "0.005" is not in atomic token units402199 ms$0.005
2 days agoAmount "0.005" is not in atomic token units402394 ms$0.005
2 days agoAmount "0.005" is not in atomic token units402426 ms$0.005
3 days agoAmount "0.005" is not in atomic token units402349 ms$0.005