API · x402

Gas price / gas fee tracker + forecast for Ethereum, Base, Arbitrum ($0.001, cheapest c…

by UnlockBot Onchain Intel (x402) · verified provider · updated 2026-10-14

30d calls—

30d payers—

MethodHTTP

Outputjson

What it does

Gas price / gas fee tracker + forecast for Ethereum, Base, Arbitrum ($0.001, cheapest call). Current base fee, 20-block average, block utilization, trend, next-block forecast, and suggested slow/standard/fast EIP-1559 fees from eth_feeHistory, plus the cost of an ETH transfer, an ERC-20 transfer and a swap in ETH. Our cheapest endpoint: a good first x402 call to test your payment setup. Keywords: gas price, gas fee, gas tracker, gwei, base fee, priority fee, transaction cost, when to transact, cheap.

Tags: crypto · defi · onchain · x402 · base · Gas · Market · Utility

Call contract

Method: HTTP
Input: HTTP request
Output: json

No input exampleProvider did not publish one in Bazaar metadata.

No output exampleProvider did not publish one in Bazaar metadata.

Use with an agent

Discover. Agents find this listing with GET https://bazaar.saylorinnovations.com/discovery/search?query=…, the MCP tool search_resources, or /discovery/resources.
Inspect. Fetch /resources/60097.json for the price and payment options.
Pay. Call GET https://hcph9fxfbpde.hostc.app/gas. The provider answers 402 with its payment requirements. An x402 client signs one of the options below and retries with PAYMENT-SIGNATURE.
Execute. The provider returns 200 with the data. Agent Bazaar is not in the request path and never sees your payment.

For humans

You don't need an account or an API key; you need a wallet holding a small amount of USDC on Base, and an x402-capable client (see the examples below). Call the endpoint unpaid first to see exactly what it asks for.

Pricing & payment

Price: $0.001 / request
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Base

x402 payment requirements

Scheme	Network	Asset	Amount	Pay to	Timeout
exact	Base eip155:8453	USDC	$0.001	0x21e4F3c6EcDb0F0CADC59511BF675B9BcBbeD304	120s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x21e4F3c6EcDb0F0CADC59511BF675B9BcBbeD304",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "1000",
    "amountUsd": 0.001,
    "maxTimeoutSeconds": 120
  }
]

Examples

curl

curl "https://hcph9fxfbpde.hostc.app/gas"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://hcph9fxfbpde.hostc.app/gas");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

Python

import httpx
res = httpx.get("https://hcph9fxfbpde.hostc.app/gas")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header

Details

Provider: UnlockBot Onchain Intel (x402)
Endpoint: https://hcph9fxfbpde.hostc.app/gas
Machine-readable: /resources/60097.json