Crypto Base Gas Estimate

{
  "data": {
    "block": {
      "gasLimit": 120000000,
      "hash": "0x1111111111111111111111111111111111111111111111111111111111111111",
      "number": 34567890,
      "requestedTag": "safe",
      "timestamp": "2026-08-10T16:00:00+00:00"
    },
    "disclaimer": "Read-only Base mainnet gas estimation only. No transaction is created, signed...",
    "estimate": {
      "bufferPercent": 20,
      "gas": 24640,
      "gasHex": "0x6040",
      "suggestedGasLimit": 29568,
      "suggestedGasLimitHex": "0x7380"
    },
    "estimationAccepted": true,
    "limitations": [
      "The estimate is state-dependent and does not guarantee later execution.",
      "Base-fee components exclude priority fees, L1 data fees, and other fee compon...",
      "Only one existing destination is estimated; contract deployment is not suppor..."
    ],
    "network": "eip155:8453",
    "networkRequestsMade": 2,
    "readOnly": true,
    "rpcCallsMade": 2,
    "rpcError": null,
    "source": "https://docs.base.org/base-chain/api-reference/ethereum-json-rpc-api/eth_esti...",
    "status": "estimated",
    "transaction": {
      "dataBytes": 36,
      "dataSha256": "2da90680426443e99a57371fef89ebdb0cba7f941eda4e27491a3bd2069ef775",
      "from": "0x1111111111111111111111111111111111111111",
      "to": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "valueWei": "0"
    },
    "transactionBroadcast": false,
    "warnings": []
  },
  "meta": {
    "cached": false,
    "duration_ms": 42,
    "next_actions": [],
    "sources": [],
    "warnings": []
  },
  "request_id": "018f1f54-7f38-7ba2-8dc3-5f90272d9f1a",
  "service": "crypto.base-gas-estimate",
  "version": "1"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://apiacre.com/v1/crypto/base-gas-estimate' \
  -H 'content-type: application/json' \
  --data-raw '{"block_tag":"safe","buffer_percent":20,"call_data":"0x70a082310000000000000000000000001111111111111111111111111111111111111111","from_address":"0x1111111111111111111111111111111111111111","to":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","value_wei":"0"}'

# 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://apiacre.com/v1/crypto/base-gas-estimate' \
  -H 'content-type: application/json' \
  --data-raw '{"block_tag":"safe","buffer_percent":20,"call_data":"0x70a082310000000000000000000000001111111111111111111111111111111111111111","from_address":"0x1111111111111111111111111111111111111111","to":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","value_wei":"0"}' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// 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 $0.004 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.004" });
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 $0.004 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapiacre.com%2Fv1%2Fcrypto%2Fbase-gas-estimate&method=POST
const res = await pay("https://apiacre.com/v1/crypto/base-gas-estimate", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "block_tag": "safe",
    "buffer_percent": 20,
    "call_data": "0x70a082310000000000000000000000001111111111111111111111111111111111111111",
    "from_address": "0x1111111111111111111111111111111111111111",
    "to": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "value_wei": "0"
  }),
});
console.log(res.status, await res.text());

# 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 $0.004 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.004"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://apiacre.com/v1/crypto/base-gas-estimate",
        json={
            "block_tag": "safe",
            "buffer_percent": 20,
            "call_data": "0x70a082310000000000000000000000001111111111111111111111111111111111111111",
            "from_address": "0x1111111111111111111111111111111111111111",
            "to": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
            "value_wei": "0",
        },
    )
    print(res.status_code, res.text)