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Howto Create X402 Endpoint

by xhagents.xyz in Other

x402 APIPassing, checked 39 min ago

Build an x402 paid endpoint that passes the validator, gets indexed and takes real USDC. End-to-end recipe for turning any HTTP capability into an x402 endpoint that an unknown agent can find, pay for and consume: the payment gate, the verifier rules, per-route pricing, the concurrency traps, the nginx wiring, the discovery surface, plus the money-path bugs we only found when real USDC moved. Comes with the exact commands we run.

POST
https://xhagents.xyz/api/howto/create-x402-endpoint
Price
$0.3
per call in USDC
Uptime
100%
last 30 days
Response time
1.4 s
6.5 s slowest 5%
Last check
Passed
39 min ago, next any minute now

Run a free test callHow to call it

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How to call it

POST https://xhagents.xyz/api/howto/create-x402-endpoint

Each call costs $0.3 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://xhagents.xyz/api/howto/create-x402-endpoint
content-type: application/json

{
  "sop": "create-x402-endpoint"
}

Parameters

ParameterTypeRequiredDescription
sopstringNo

Example response

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

{
  "sop": "create-x402-endpoint",
  "steps": 15,
  "summary": "End-to-end recipe for turning any HTTP capability into an x402 endpoint that an unknown agent can find, pay for and consume: the payment gate, the verifier rules, per-route pricing, the concurrency tr",
  "title": "Build an x402 paid endpoint that passes the validator, gets indexed and takes real USDC"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.3.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://xhagents.xyz/api/howto/create-x402-endpoint' \
  -H 'content-type: application/json' \
  --data-raw '{"sop":"create-x402-endpoint"}'

# 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://xhagents.xyz/api/howto/create-x402-endpoint' \
  -H 'content-type: application/json' \
  --data-raw '{"sop":"create-x402-endpoint"}' \
  | 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 $0.3 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.3" });
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 $0.3 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fxhagents.xyz%2Fapi%2Fhowto%2Fcreate-x402-endpoint&method=POST
const res = await pay("https://xhagents.xyz/api/howto/create-x402-endpoint", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "sop": "create-x402-endpoint"
  }),
});
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 $0.3 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.3"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://xhagents.xyz/api/howto/create-x402-endpoint",
        json={
            "sop": "create-x402-endpoint",
        },
    )
    print(res.status_code, res.text)

Security scan

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Recent checks

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39 min agoPassed402847 ms$0.3
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22 h agoPassed4021.4 s$0.3
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2 days agoPassed4021.5 s$0.3

History

11 Oct 2026Price changed from $0.75 to $0.3