ToolVet
77trust / 100

Explain

by Explain a transaction in Onchain & crypto

x402 APIPassing, checked 22 min ago

Decode a transaction into plain language: native ETH transfer, contract call (with decoded method name for common ERC-20/DEX functions like transfer, approve, swap, mint, multicall) or contract creation; ERC-20 and NFT (ERC-721) transfers it triggered (token, from, to, amount/tokenId from logs); gas spent in ETH; success/failed/pending; and a one-line summary. Reads live on-chain data with automatic endpoint fallback.

POST
https://chain.openverbs.com/v1/explain
Price
$0.006
per call in USDC
Uptime
100%
last 30 days
Response time
560 ms
669 ms slowest 5%
Last check
Passed
22 min ago, next in 7 min

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

POST https://chain.openverbs.com/v1/explain

Each call costs $0.006 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://chain.openverbs.com/v1/explain
content-type: application/json

{
  "chain": "ethereum",
  "hash": "0x9ef1a5b4082c4f1f6bb2f2f67fb64115bd10815d6c20a2d1b5f9f5ddf8f8f8f8"
}

Parameters

ParameterTypeRequiredDescription
chainstringNoEVM chain to query. One of: ethereum, base, arbitrum, optimism, polygon. Default "ethereum". One of: ethereum, base, arbitrum, optimism, polygon.
hashstringYes32-byte transaction hash.

Example response

The listing has no example response.

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.006.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://chain.openverbs.com/v1/explain' \
  -H 'content-type: application/json' \
  --data-raw '{"chain":"ethereum","hash":"0x9ef1a5b4082c4f1f6bb2f2f67fb64115bd10815d6c20a2d1b5f9f5ddf8f8f8f8"}'

# 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://chain.openverbs.com/v1/explain' \
  -H 'content-type: application/json' \
  --data-raw '{"chain":"ethereum","hash":"0x9ef1a5b4082c4f1f6bb2f2f67fb64115bd10815d6c20a2d1b5f9f5ddf8f8f8f8"}' \
  | 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 $0.006 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.006" });
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 $0.006 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fchain.openverbs.com%2Fv1%2Fexplain&method=POST
const res = await pay("https://chain.openverbs.com/v1/explain", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "chain": "ethereum",
    "hash": "0x9ef1a5b4082c4f1f6bb2f2f67fb64115bd10815d6c20a2d1b5f9f5ddf8f8f8f8"
  }),
});
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 $0.006 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.006"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://chain.openverbs.com/v1/explain",
        json={
            "chain": "ethereum",
            "hash": "0x9ef1a5b4082c4f1f6bb2f2f67fb64115bd10815d6c20a2d1b5f9f5ddf8f8f8f8",
        },
    )
    print(res.status_code, res.text)

Security scan

No findings

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Recent checks

WhenResultHTTPTimePrice
22 min agoPassed402167 ms$0.006
6 h agoPassed402564 ms$0.006
10 h agoPassed402669 ms$0.006
15 h agoPassed402496 ms$0.006
20 h agoPassed402603 ms$0.006
Show 10 older checks
25 h agoPassed402568 ms$0.006
29 h agoPassed402525 ms$0.006
34 h agoPassed402167 ms$0.006
38 h agoPassed402510 ms$0.006
43 h agoPassed402166 ms$0.006
47 h agoPassed402566 ms$0.006
2 days agoPassed402509 ms$0.006
2 days agoPassed402561 ms$0.006
3 days agoPassed402166 ms$0.006
3 days agoPassed402601 ms$0.006