ToolVet
74trust / 100

Trust A2a Transaction Bridge

by A2A Transaction Bridge in Onchain & crypto

x402 APIPassing, checked 5 h ago

Bind A2A task identity to a transaction while preserving explicit authority gaps

POST
https://phion.systems/v1/paid/trust/a2a-transaction-bridge
Price
$0.004
per call in USDC
Uptime
97.4%
last 30 days
Response time
542 ms
687 ms slowest 5%
Last check
Passed
5 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 · Watch with other listings

How to call it

POST https://phion.systems/v1/paid/trust/a2a-transaction-bridge

Each call costs $0.004 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

The listing has no example input.

POST https://phion.systems/v1/paid/trust/a2a-transaction-bridge
content-type: application/json

{}

Example response

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

{
  "assessment": {
    "confidence": 0.5,
    "risk_band": "review"
  },
  "receipt": {
    "signature": "base64url"
  }
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.004.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://phion.systems/v1/paid/trust/a2a-transaction-bridge' \
  -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://phion.systems/v1/paid/trust/a2a-transaction-bridge' \
  -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 $0.004 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.004" });
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 $0.004 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fphion.systems%2Fv1%2Fpaid%2Ftrust%2Fa2a-transaction-bridge&method=POST
const res = await pay("https://phion.systems/v1/paid/trust/a2a-transaction-bridge", {
  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 $0.004 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.004"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://phion.systems/v1/paid/trust/a2a-transaction-bridge",
        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
5 h agoPassed402555 ms$0.004
10 h agoPassed402593 ms$0.004
15 h agoPassed402542 ms$0.004
21 h agoPassed402557 ms$0.004
26 h agoPassed402643 ms$0.004
Show 10 older checks
30 h agoPassed402592 ms$0.004
35 h agoPassed402141 ms$0.004
40 h agoTimed out---
44 h agoPassed402571 ms$0.004
2 days agoPassed402553 ms$0.004
2 days agoPassed402535 ms$0.004
2 days agoPassed402578 ms$0.004
3 days agoPassed402610 ms$0.004
3 days agoPassed402540 ms$0.004
3 days agoPassed402145 ms$0.004