ToolVet
71trust / 100

Print

by PostAgent in Documents & files

x402 APIPassing, checked 13 min ago

Print and mail physical US letters (PDF, HTML, Markdown, DOCX, or image) and postcards via USPS, paid in USDC — with certified/registered proof options and standalone address verification at POST /v1/verify. Integration flow: POST /v1/documents to upload, POST /v1/quotes to lock a fixed USDC price for a recipient, then pay the returned per-quote x402 URL to create and mail the piece. Price is fixed per quote.

POST
https://api.postagent.sh/v1/print
Price
$1.24
per call in USDC
Uptime
100%
last 30 days
Response time
1.0 s
1.2 s slowest 5%
Last check
Passed
13 min ago, next in 15 min

Run a free test callHow to call it

Reliability

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Status and outage history · Atom feed

How to call it

POST https://api.postagent.sh/v1/print

Each call costs $1.24 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://api.postagent.sh/v1/print
content-type: application/json

{
  "webhookUrl": "https://example.com/postagent-status"
}

Parameters

ParameterTypeRequiredDescription
webhookUrlstringNoOptional HTTPS URL that receives job status webhooks after the letter is created.

Example response

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

{
  "createdAt": "2026-01-01T00:00:00.000Z",
  "documentId": "doc_9z8y7x6w",
  "id": "job_8f3c0a2b",
  "payment": {
    "amountAtomic": "1370000",
    "network": "eip155:8453",
    "payer": "0x0000000000000000000000000000000000000000",
    "transaction": "0x0000000000000000000000000000000000000000000000000000000000000000"
  },
  "quoteId": "qt_1a2b3c4d",
  "status": "received",
  "tracking": {
    "events": []
  }
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $1.24.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://api.postagent.sh/v1/print' \
  -H 'content-type: application/json' \
  --data-raw '{"webhookUrl":"https://example.com/postagent-status"}'

# 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://api.postagent.sh/v1/print' \
  -H 'content-type: application/json' \
  --data-raw '{"webhookUrl":"https://example.com/postagent-status"}' \
  | 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 $1.24 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$1.24" });
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 $1.24 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.postagent.sh%2Fv1%2Fprint&method=POST
const res = await pay("https://api.postagent.sh/v1/print", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "webhookUrl": "https://example.com/postagent-status"
  }),
});
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 $1.24 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$1.24"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://api.postagent.sh/v1/print",
        json={
            "webhookUrl": "https://example.com/postagent-status",
        },
    )
    print(res.status_code, res.text)

Security scan

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Recent checks

WhenResultHTTPTimePrice
13 min agoPassed4021.0 s$1.24
5 h agoPassed402961 ms$1.24
9 h agoPassed402972 ms$1.24
13 h agoPassed402993 ms$1.24
17 h agoPassed4021.0 s$1.24
Show 10 older checks
21 h agoPassed402984 ms$1.24
26 h agoPassed4021.1 s$1.24
30 h agoPassed402716 ms$1.24
34 h agoPassed4021.0 s$1.24
37 h agoPassed4021.0 s$1.24
41 h agoPassed4021.0 s$1.24
45 h agoPassed4021.2 s$1.24
2 days agoPassed4021.0 s$1.24
2 days agoPassed4021.2 s$1.24
2 days agoPassed4021.0 s$1.24