ToolVet
78trust / 100

Idempotency

by TrollBridge in Onchain & crypto

x402 APIPassing, checked 3 h ago

NOT ENFORCEMENT — deterministic idempotency key minting ($0.02): hashes your normalized write intent + caller nonce into a retry key and resolves post-timeout state (UNKNOWN_OUTCOME + recommended action). The lane mints the key — the CALLER must attach it; a server that ignores idempotency keys makes any key decoration. Toll: $0.02 USDC on Base or Solana.

GET
https://mini-tollbooth.onrender.com/idempotency
Price
$0.02
per call in USDC
Uptime
100%
last 30 days
Response time
220 ms
667 ms slowest 5%
Last check
Passed
3 h ago, next any minute now

Run a free test callHow to call it

Reliability

All checks passedSome failedAll failedNot checked

Status and outage history · Atom feed

How to call it

GET https://mini-tollbooth.onrender.com/idempotency

Each call costs $0.02 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.

GET https://mini-tollbooth.onrender.com/idempotency?caller_nonce=payout-2026-10-05-001&write_intent=send+5+USDC+to+0x8BE8D056d5F0bEF850eC9ed5C4a8d647cBE896C0

Parameters

ParameterTypeRequiredDescription
caller_noncestringNoDisambiguator for genuinely-different writes with identical intent text — optional, generated if omitted.
transport_evidenceobjectNo{outcome, endpoint, elapsed_ms} — what failed, optional.
write_intentstringYesThe write the key covers — required.

Example response

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

{
  "caller_nonce": "payout-2026-10-05-001",
  "description": "NOT ENFORCEMENT — deterministic idempotency key minting ($0.02): hashes your normalized write intent + caller nonce into a retry key and resolves post-timeout state (UNKNOWN_OUTCOME + recommended action). The lane mints the key — the CALLER must attach it; a server that ignores idempotency keys makes any key decoration.",
  "idempotency_key": "idem_9f2c4a1b7e30…",
  "lane": "/idempotency",
  "resolution": {
    "recommended_action": [
      "…"
    ],
    "status": "UNKNOWN_OUTCOME"
  },
  "warning": "NOT_ENFORCEMENT — this lane mints the key; the caller must attach it and the server must honor it, or the key is decoration."
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.02.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://mini-tollbooth.onrender.com/idempotency?caller_nonce=payout-2026-10-05-001&write_intent=send+5+USDC+to+0x8BE8D056d5F0bEF850eC9ed5C4a8d647cBE896C0'

# 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 - 'https://mini-tollbooth.onrender.com/idempotency?caller_nonce=payout-2026-10-05-001&write_intent=send+5+USDC+to+0x8BE8D056d5F0bEF850eC9ed5C4a8d647cBE896C0' \
  | 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 $0.02 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.02" });
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 $0.02 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fmini-tollbooth.onrender.com%2Fidempotency
const res = await pay("https://mini-tollbooth.onrender.com/idempotency?caller_nonce=payout-2026-10-05-001&write_intent=send+5+USDC+to+0x8BE8D056d5F0bEF850eC9ed5C4a8d647cBE896C0");
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 $0.02 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.02"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://mini-tollbooth.onrender.com/idempotency?caller_nonce=payout-2026-10-05-001&write_intent=send+5+USDC+to+0x8BE8D056d5F0bEF850eC9ed5C4a8d647cBE896C0")
    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 agoPassed402225 ms$0.02
7 h agoPassed402543 ms$0.02
11 h agoPassed402218 ms$0.02
15 h agoPassed402688 ms$0.02
20 h agoPassed402197 ms$0.02
Show 10 older checks
24 h agoPassed402206 ms$0.02
28 h agoPassed402556 ms$0.02
32 h agoPassed402212 ms$0.02
36 h agoPassed402622 ms$0.02
39 h agoPassed402203 ms$0.02
43 h agoPassed402226 ms$0.02
47 h agoPassed402220 ms$0.02
2 days agoPassed402637 ms$0.02
2 days agoPassed402216 ms$0.02
2 days agoPassed402195 ms$0.02