Evidence

{
  "assessment": {
    "basis": "1 source(s) contained passages matching the question (company.example) with no contradicting passages found.",
    "status": "supported"
  },
  "limitations": [
    "Assessment is derived from deterministic lexical matching, not semantic reasoning."
  ],
  "processing_ms": 812,
  "question": "Is Company X a manufacturer of centrifugal pumps?",
  "request_id": "req_1f2e3d4c5b6a7988",
  "sources": [
    {
      "canonical_url": "https://company.example/about",
      "content_hash_sha256": "9f2c…",
      "content_type": "text/html; charset=utf-8",
      "evidence": [
        {
          "context": "h2:Products > p[1]",
          "excerpt": "Company X manufactures centrifugal pumps at its facility.",
          "relevance": "direct"
        }
      ],
      "final_url": "https://company.example/about",
      "language": "en",
      "publisher": "Company X",
      "requested_url": "https://company.example/about",
      "retrieved_at": "2026-01-01T00:00:00.000Z",
      "status": 200,
      "title": "Company X - About",
      "warnings": [],
      "word_count": 412
    }
  ],
  "version": "1"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://agent-evidence.thx93.dev/v1/evidence' \
  -H 'content-type: application/json' \
  --data-raw '{"language":"auto","max_sources":5,"mode":"evidence","question":"Is Company X a manufacturer of centrifugal pumps?","urls":["https://company.example/about","https://company.example/products"]}'

# 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://agent-evidence.thx93.dev/v1/evidence' \
  -H 'content-type: application/json' \
  --data-raw '{"language":"auto","max_sources":5,"mode":"evidence","question":"Is Company X a manufacturer of centrifugal pumps?","urls":["https://company.example/about","https://company.example/products"]}' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// 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%2Fagent-evidence.thx93.dev%2Fv1%2Fevidence&method=POST
const res = await pay("https://agent-evidence.thx93.dev/v1/evidence", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "language": "auto",
    "max_sources": 5,
    "mode": "evidence",
    "question": "Is Company X a manufacturer of centrifugal pumps?",
    "urls": [
      "https://company.example/about",
      "https://company.example/products"
    ]
  }),
});
console.log(res.status, await res.text());

# 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://agent-evidence.thx93.dev/v1/evidence",
        json={
            "language": "auto",
            "max_sources": 5,
            "mode": "evidence",
            "question": "Is Company X a manufacturer of centrifugal pumps?",
            "urls": [
                "https://company.example/about",
                "https://company.example/products",
            ],
        },
    )
    print(res.status_code, res.text)