Gas Now Base

Real-time gas price oracle for Base, Ethereum, Optimism, Arbitrum, and Polygon.

Overview

Real-time gas price oracle for Base, Ethereum, Optimism, Arbitrum, and Polygon. Reads the chain's latest block, derives the EIP-1559 base fee, suggests safe-low / standard / fast priority-fee tiers with a total recommended maxFeePerGas, and converts the cost to USD for common transactions (transfer, ERC-20 transfer, Uniswap swap, NFT mint). Use it as a gas price API, EIP-1559 fee estimator, etherscan-gas alternative, or pre-transaction cost calculator.

Endpoint

Method	Endpoint	Price	Description
POST	/v1/marketplace/api/gas-now-base-266	$0.023	Invoke Gas Now Base (General) and return the upstream response.

How to call it

Requests are paid per call over the x402 protocol. Call the endpoint, receive a 402 Payment Required quote, then repeat the request with the signed payment header. The SDKs do both steps for you.

# 1. Ask for a quote
curl -i -X POST https://api.jarvisclaw.ai/v1/marketplace/api/gas-now-base-266 \
  -H 'Content-Type: application/json' \
  -d '{}'

# 2. Pay it (the SDK signs and retries for you)
curl -X POST https://api.jarvisclaw.ai/v1/marketplace/api/gas-now-base-266 \
  -H 'Content-Type: application/json' \
  -H 'X-PAYMENT: <signed-payload>' \
  -d '{}'

Open in the marketplace