ToolVet
78trust / 100

Transactions Storage Writes

by TraceFast in Onchain & crypto

x402 APIPassing, checked 3 h ago

TraceFast live Ethereum data: every contract storage slot a transaction wrote, in execution order — which contract's storage, which frame wrote it (with the address whose code ran, which on a `delegatecall` is not the storage owner), the slot, the value written, and the value the slot held before where that can be established. Path: hash. Query: limit, cursor (see docs). Docs: https://docs.tracefast.xyz/api/transaction-storage-writes.md

GET
https://mpp.tracefast.xyz/api/v1/chains/1/transactions/:hash/storage-writes
Price
$0.1
per call in USDC
Uptime
100%
last 30 days
Response time
293 ms
575 ms slowest 5%
Last check
Passed
3 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/transactions/:hash/storage-writes

Each call costs $0.1 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/transactions/:hash/storage-writes?limit=10

Example response

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

{
  "data": {
    "blockNumber": 25000000,
    "hash": "0x0e646d1b52758cafe4eca236972927be572053491217fa08751d3958a1e30f0a",
    "txIndex": 0,
    "writes": [
      {
        "callDepth": 1,
        "callPath": "0000",
        "callType": "call",
        "callerAddress": "0x9f59a6cc9538d4764cabde4ccaf6d02c8e8dddd6",
        "executionAddress": "0x681e908b8ab57c49c74d770f369754ccc3e1ae09",
        "newValue": "0x870b0fac41005ea73425300005f5af8b070066a977bb120000019de3718f4200",
        "storageAddress": "0x681e908b8ab57c49c74d770f369754ccc3e1ae09",
        "storageKey": "0xb973b814a43ee884f5bfb5464036c9b3d9e4c942000000000000000000000000",
        "valueBefore": "0x870b43983c005ea7b1d72f0005f5af8b070066a96fd1190000019de3715c5a00",
        "valueBeforeStatus": "resolved",
        "writeIndex": 0,
        "writeIndexStatus": "present"
      }
    ],
    "writesTruncated": false
  }
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.1.

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/transactions/:hash/storage-writes?limit=10'

# 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/transactions/:hash/storage-writes?limit=10' \
  | 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 $0.1 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.1" });
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 $0.1 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fmpp.tracefast.xyz%2Fapi%2Fv1%2Fchains%2F1%2Ftransactions%2F%3Ahash%2Fstorage-writes
const res = await pay("https://mpp.tracefast.xyz/api/v1/chains/1/transactions/:hash/storage-writes?limit=10");
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 $0.1 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.1"})
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/transactions/:hash/storage-writes?limit=10")
    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
3 h agoPassed402624 ms$0.1
7 h agoPassed402575 ms$0.1
11 h agoPassed402175 ms$0.1
16 h agoPassed402318 ms$0.1
20 h agoPassed40248 ms$0.1
Show 10 older checks
24 h agoPassed402282 ms$0.1
28 h agoPassed40251 ms$0.1
32 h agoPassed402167 ms$0.1
36 h agoPassed402346 ms$0.1
40 h agoPassed402415 ms$0.1
44 h agoPassed40240 ms$0.1
2 days agoPassed402272 ms$0.1
2 days agoPassed402315 ms$0.1
2 days agoPassed402334 ms$0.1
3 days agoPassed40254 ms$0.1

History

12 Oct 2026Price changed from $0.2 to $0.1