ToolVet
80trust / 100

Relations At Block

by TraceFast in Onchain & crypto

x402 APIPassing, checked 4 h ago

TraceFast knowledge graph: the relations an address was the subject of at the end of one block — which implementation a proxy pointed at, which beacon it read, who administered it, where an account had delegated — each with the window it held for. Path address: The address, `0x`-prefixed, 40 hex characters, any case. Query block: The block to answer about. Docs: https://docs.tracefast.xyz/api/address-relations-at-block.md

GET
https://mpp.tracefast.xyz/api/v1/chains/1/entities/:address/relations/at-block
Price
$0.025
per call in USDC
Uptime
100%
last 30 days
Response time
284 ms
557 ms slowest 5%
Last check
Passed
4 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

GET https://mpp.tracefast.xyz/api/v1/chains/1/entities/:address/relations/at-block

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/at-block?block=25000000

Example response

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

{
  "data": {
    "address": "0x7a250d5630b4cf539739df2c5dacb4c659f2488d",
    "addressKnown": true,
    "block": 25000000,
    "chainId": 1,
    "coverageBlock": 26096255,
    "coveredFamilies": [
      "relation:was_implementation_of"
    ],
    "intervals": []
  }
}

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/at-block?block=25000000'

# 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/at-block?block=25000000' \
  | 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%2Fat-block
const res = await pay("https://mpp.tracefast.xyz/api/v1/chains/1/entities/:address/relations/at-block?block=25000000");
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/at-block?block=25000000")
    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
4 h agoPassed402148 ms$0.025
8 h agoPassed402725 ms$0.025
12 h agoPassed402336 ms$0.025
17 h agoPassed402377 ms$0.025
21 h agoPassed40240 ms$0.025
Show 10 older checks
25 h agoPassed40238 ms$0.025
29 h agoPassed402422 ms$0.025
33 h agoPassed402204 ms$0.025
37 h agoPassed402325 ms$0.025
41 h agoPassed402113 ms$0.025
45 h agoPassed402257 ms$0.025
2 days agoPassed402284 ms$0.025
2 days agoPassed402153 ms$0.025
2 days agoPassed402486 ms$0.025
3 days agoPassed402352 ms$0.025

History

12 Oct 2026Price changed from $0.05 to $0.025