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Tools Gas
by x402 tools in Onchain & crypto
x402 APIPassing, checked 3 h ago
Use before sending an EVM transaction to pick the cheapest chain and set its fees. Live gas on Ethereum, Base, Arbitrum, Optimism, Polygon and BSC: slow/standard/fast EIP-1559 fee tiers (priority fee, maxFee) from recent blocks, plus the USD cost of a transfer, ERC-20 transfer and swap per tier, cheapest chain first.
GET https://x402-tools-production-2755.up.railway.app/tools/gas
Last 30 days
All checks passedSome failedAll failedNot checked
- Uptime
- 100%
- Response time
- 178 ms typical, 178 ms slowest 5%
- Last check
- 3 h ago
- Next check
- any minute now
How to call it
# See the payment challenge (nothing is charged)
curl -i -X GET "https://x402-tools-production-2755.up.railway.app/tools/gas?chains=base%2Cethereum"import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { ExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";
const client = new x402Client().register(
"eip155:8453",
new ExactEvmScheme(privateKeyToAccount(process.env.AGENT_KEY)),
);
const pay = wrapFetchWithPayment(fetch, client);
// Not sure it's safe to pay? Preflight it first for $0.005:
// GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fx402-tools-production-2755.up.railway.app%2Ftools%2Fgas
const res = await pay("https://x402-tools-production-2755.up.railway.app/tools/gas?chains=base%2Cethereum");
console.log(await res.json());Example input
{
"chains": "base,ethereum"
}Example output
{
"chains": [
{
"baseFeeGwei": 0.005,
"chain": "base",
"chainId": 8453,
"costs": {
"erc20Transfer": {
"native": 3.9e-7,
"usd": 0.00107
},
"swap": {
"native": 9e-7,
"usd": 0.0025
},
"transfer": {
"native": 1.26e-7,
"usd": 0.00035
}
},
"gasPriceGwei": 0.006,
"nativeSymbol": "ETH",
"nativeUsd": 2734.49,
"tiers": {
"fast": {
"costs": {
"transfer": {
"native": 5.6e-7,
"usd": 0.00152
}
},
"effectiveGwei": 0.0266,
"maxFeeGwei": 0.0316,
"priorityFeeGwei": 0.0216
},
"slow": {
"costs": {
"transfer": {
"native": 1.05e-7,
"usd": 0.00029
}
},
"effectiveGwei": 0.005,
"maxFeeGwei": 0.01,
"priorityFeeGwei": 0
},
"standard": {
"costs": {
"transfer": {
"native": 1.26e-7,
"usd": 0.00035
}
},
"effectiveGwei": 0.006,
"maxFeeGwei": 0.011,
"priorityFeeGwei": 0.001
}
}
}
],
"gasUsed": {
"erc20Transfer": 65000,
"swap": 150000,
"transfer": 21000
}
}Security scan
- No findings. We scan names, descriptions and tool definitions for hidden instructions and other prompt-injection patterns.
Recent checks
| When | Result | HTTP | Time | Price |
|---|---|---|---|---|
| 3 h ago | Passed | 402 | 333 ms | $0.002 |
| 8 h ago | Passed | 402 | 178 ms | $0.002 |