ToolVet
77trust / 100

Session Create

by AgentPay Spend Cap & Receipts in Onchain & crypto

x402 APIPassing, checked 3 min ago

A stateful, multi-chain spending session for AI agents. One session enforces a hard USDC budget cap across every tool call, with a verifiable receipt and running ledger for each payment — not a one-shot budget check, but persistent spend governance with a full audit trail. The gateway enforces the cap for the paying wallet on Stacks and Base. USDC on Base (standard x402) or Stellar (via the AgentPay SDK); sBTC on Stacks (any Stacks x402 client).

POST
https://agentpay.tools/v1/session/create
Price
$0.01
per call in USDC
Uptime
100%
last 30 days
Response time
407 ms
665 ms slowest 5%
Last check
Passed
3 min ago, next in 28 min

Run a free test callHow to call it

Reliability

All checks passedSome failedAll failedNot checked

Status and outage history · Atom feed · Watch with other listings

How to call it

POST https://agentpay.tools/v1/session/create

Each call costs $0.01 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://agentpay.tools/v1/session/create
content-type: application/json

{
  "agent_address": "0x0000000000000000000000000000000000000000",
  "label": "session",
  "max_spend": "0.10"
}

Parameters

ParameterTypeRequiredDescription
agent_addressstringYesPaying agent's EVM wallet address
labelstringNoOptional human-readable session label
max_spendstringNoHard budget cap in USDC, e.g. '0.10'

Example response

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

{
  "created_at": "2026-05-29T00:00:00Z",
  "gateway_url": "https://agentpay.tools",
  "max_spend": "0.10",
  "receipt": {
    "amount_usdc": "0.01",
    "network": "eip155:8453",
    "tx_hash": "0xee85d8dd374b5d1cb40bfa441086af557d356acc2bb4d5819f56331fce42adee"
  },
  "session_id": "f47ac10b-58cc-4372-a567-0e02b2c3d479",
  "tools_endpoint": "https://agentpay.tools/tools"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.01.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://agentpay.tools/v1/session/create' \
  -H 'content-type: application/json' \
  --data-raw '{"agent_address":"0x0000000000000000000000000000000000000000","label":"session","max_spend":"0.10"}'

# 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://agentpay.tools/v1/session/create' \
  -H 'content-type: application/json' \
  --data-raw '{"agent_address":"0x0000000000000000000000000000000000000000","label":"session","max_spend":"0.10"}' \
  | 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 $0.01 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.01" });
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 $0.01 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fagentpay.tools%2Fv1%2Fsession%2Fcreate&method=POST
const res = await pay("https://agentpay.tools/v1/session/create", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "agent_address": "0x0000000000000000000000000000000000000000",
    "label": "session",
    "max_spend": "0.10"
  }),
});
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 $0.01 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.01"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://agentpay.tools/v1/session/create",
        json={
            "agent_address": "0x0000000000000000000000000000000000000000",
            "label": "session",
            "max_spend": "0.10",
        },
    )
    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 min agoPassed402367 ms$0.01
5 h agoPassed402323 ms$0.01
10 h agoPassed402349 ms$0.01
15 h agoPassed402410 ms$0.01
20 h agoPassed402499 ms$0.01
Show 10 older checks
24 h agoPassed402516 ms$0.01
29 h agoPassed402397 ms$0.01
34 h agoPassed402384 ms$0.01
38 h agoPassed402537 ms$0.01
42 h agoPassed402389 ms$0.01
46 h agoPassed402396 ms$0.01
2 days agoPassed402420 ms$0.01
2 days agoPassed402665 ms$0.01
2 days agoPassed402345 ms$0.01
3 days agoPassed402386 ms$0.01