ToolVet
78trust / 100

Relations Proof

by TraceFast in Onchain & crypto

x402 APIPassing, checked 2 h ago

TraceFast knowledge graph: the evidence behind one proven relation between two addresses — the facts checked with their expected and observed values, the conditions that had to be false, the sources read, and the block the evaluation was pinned to. Path: address, attribute_id, object. Docs: https://docs.tracefast.xyz/api/address-relation-proof.md

GET https://mpp.tracefast.xyz/api/v1/chains/1/entities/:address/relations/:attribute_id/:object/proof

Last 30 days

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Status and outage history · Atom feed

Uptime
100%
Response time
131 ms typical, 398 ms slowest 5%
Last check
2 h ago
Next check
any minute now

How to call it

GET https://mpp.tracefast.xyz/api/v1/chains/1/entities/:address/relations/:attribute_id/:object/proof

Each call costs $0.025 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://mpp.tracefast.xyz/api/v1/chains/1/entities/:address/relations/:attribute_id/:object/proof

Example response

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

Example response, 43 lines
{
  "data": {
    "attributeId": "relation:contract_created_by",
    "bindingVersions": {
      "ev:2614ee7c7c48": "ev:d3ca8932be98"
    },
    "chainId": 1,
    "definitionVersion": "1.0.0",
    "dependencyProofRefs": [],
    "evaluatedAt": 1787500189,
    "evaluatorVersion": "1.0.0",
    "factResults": [
      {
        "fact_id": "successful_create_lineage",
        "observed": true,
        "operator": "exists",
        "threshold": 1
      }
    ],
    "failureReasonCodes": [],
    "graphRevision": "4855f85e632b317a25acd1aa04d7b88242f55acf",
    "negativeControlResults": [
      {
        "control_id": "deployer_not_self",
        "evaluation": "must_be_false",
        "observed": false
      }
    ],
    "object": "0x9c33eacc2f50e39940d3afaf2c7b8246b681a374",
    "proofHash": "sha256:d7ee40dcb4b72022dd990f640d80daa6fff749dd95d71c8e5b529e5f4c440fcb",
    "referenceBlock": 10207858,
    "referenceBlockHash": "0xe190f8921da7de355ef7100afbe705bce871ea3c082610b2632fa094d158f656",
    "result": "pass",
    "selectedFamilyId": "create_lineage",
    "snapshotId": "eth-mainnet@10207858",
    "sourceEvidenceRefs": [
      {
        "sourceId": "ev:5d078addaca0"
      }
    ],
    "subject": "0x7a250d5630b4cf539739df2c5dacb4c659f2488d"
  }
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.025.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://mpp.tracefast.xyz/api/v1/chains/1/entities/:address/relations/:attribute_id/:object/proof'

# 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://mpp.tracefast.xyz/api/v1/chains/1/entities/:address/relations/:attribute_id/:object/proof' \
  | 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 $0.025 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.025" });
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 $0.025 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fmpp.tracefast.xyz%2Fapi%2Fv1%2Fchains%2F1%2Fentities%2F%3Aaddress%2Frelations%2F%3Aattribute_id%2F%3Aobject%2Fproof
const res = await pay("https://mpp.tracefast.xyz/api/v1/chains/1/entities/:address/relations/:attribute_id/:object/proof");
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 $0.025 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.025"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://mpp.tracefast.xyz/api/v1/chains/1/entities/:address/relations/:attribute_id/:object/proof")
    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
2 h agoPassed402235 ms$0.025
6 h agoPassed402398 ms$0.025
10 h agoPassed402317 ms$0.025
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47 h agoPassed402328 ms$0.025
2 days agoPassed402316 ms$0.025
2 days agoPassed40236 ms$0.025

History

12 Oct 2026Price changed from $0.05 to $0.025