ToolVet
80trust / 100

Chain Chain Call

by agent.connskill.com in Onchain & crypto

x402 APIPassing, checked 3 h ago

Read-only EVM contract call (eth_call) with decoded revert reason and optional gas estimate — simulate before you sign

POST
https://agent.connskill.com/chain/v1/chain-call
Price
$0.02
per call in USDC
Uptime
100%
last 30 days
Response time
137 ms
186 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

POST https://agent.connskill.com/chain/v1/chain-call

Each call costs $0.02 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://agent.connskill.com/chain/v1/chain-call
content-type: application/json

{
  "chain": "base",
  "data": "0x70a0823100000000000000000000000043b85ae58f0a2505c710bc715d6f3eb16b1f63de",
  "to": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
}

Parameters

ParameterTypeRequiredDescription
blockstringNoBlock tag (latest/safe/finalized/earliest) or hex block number; default latest
chainstringYes One of: base, ethereum, arbitrum, optimism, polygon.
datastringNoABI-encoded calldata (0x…); defaults to 0x
fromstringNoOptional caller address — enables gas estimation
tostringYesContract to call
valuestringNoOptional value in wei (hex 0x… or decimal string)

Example response

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

{
  "chain": "base",
  "gasEstimate": "26000",
  "result": "0x0000000000000000000000000000000000000000000000000000000001e1e5a0",
  "reverted": false,
  "status": "delivered"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.02.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://agent.connskill.com/chain/v1/chain-call' \
  -H 'content-type: application/json' \
  --data-raw '{"chain":"base","data":"0x70a0823100000000000000000000000043b85ae58f0a2505c710bc715d6f3eb16b1f63de","to":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"}'

# 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.connskill.com/chain/v1/chain-call' \
  -H 'content-type: application/json' \
  --data-raw '{"chain":"base","data":"0x70a0823100000000000000000000000043b85ae58f0a2505c710bc715d6f3eb16b1f63de","to":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"}' \
  | 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 $0.02 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.02" });
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 $0.02 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fagent.connskill.com%2Fchain%2Fv1%2Fchain-call&method=POST
const res = await pay("https://agent.connskill.com/chain/v1/chain-call", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "chain": "base",
    "data": "0x70a0823100000000000000000000000043b85ae58f0a2505c710bc715d6f3eb16b1f63de",
    "to": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
  }),
});
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 $0.02 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.02"})
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.connskill.com/chain/v1/chain-call",
        json={
            "chain": "base",
            "data": "0x70a0823100000000000000000000000043b85ae58f0a2505c710bc715d6f3eb16b1f63de",
            "to": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        },
    )
    print(res.status_code, res.text)

Security scan

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3 days agoPassed40234 ms$0.02