ToolVet
71trust / 100

Fetch Evidence

by phion.systems in Search & web

x402 APIPassing, checked 6 h ago

Independent, prompt-injection-screened, hashed and signed web evidence for AI agents

POST
https://phion.systems/v1/paid/fetch-evidence
Price
$0.004
per call in USDC
Uptime
97.1%
last 30 days
Response time
596 ms
763 ms slowest 5%
Last check
Passed
6 h ago, next any minute now

Run a free test callHow to call it

Reliability

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

How to call it

POST https://phion.systems/v1/paid/fetch-evidence

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

From the listing.

POST https://phion.systems/v1/paid/fetch-evidence
content-type: application/json

{
  "url": "https://example.com"
}

Example response

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

{
  "evidence": {
    "observation": "independently_fetched",
    "prompt_injection": {
      "detected": false,
      "risk": "low"
    },
    "raw_sha256": "hex"
  },
  "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/fetch-evidence' \
  -H 'content-type: application/json' \
  --data-raw '{"url":"https://example.com"}'

# 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/fetch-evidence' \
  -H 'content-type: application/json' \
  --data-raw '{"url":"https://example.com"}' \
  | 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%2Ffetch-evidence&method=POST
const res = await pay("https://phion.systems/v1/paid/fetch-evidence", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "url": "https://example.com"
  }),
});
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/fetch-evidence",
        json={
            "url": "https://example.com",
        },
    )
    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
6 h agoPassed402563 ms$0.004
15 h agoPassed402615 ms$0.004
25 h agoPassed402632 ms$0.004
37 h agoPassed402653 ms$0.004
47 h agoPassed402590 ms$0.004
Show 10 older checks
2 days agoPassed402545 ms$0.004
3 days agoPassed402598 ms$0.004
3 days agoPassed402657 ms$0.004
4 days agoPassed402554 ms$0.004
4 days agoPassed402658 ms$0.004
4 days agoPassed402586 ms$0.004
4 days agoPassed402540 ms$0.004
4 days agoPassed402573 ms$0.004
5 days agoPassed402763 ms$0.004
5 days agoPassed402548 ms$0.004