{"name":"gas-price-api","description":"Estimates blockchain gas prices: base fee, priority fee tiers, maxFeePerGas, and USD transaction costs for Base, Ethereum, Optimism, and Arbitrum. Same gas-price handler. Use it as a gas price API, EIP-1559 gas fee endpoint, or blockchain transaction fee estimator.","price":"$0.02","method":"POST","input_schema":{"properties":{"chain":{"type":"string","enum":["base","ethereum","optimism","arbitrum","polygon"],"description":"EVM L1/L2 to read gas from. Default 'base'."}}},"input_example":{"chain":"base"},"output_example":{"chain":"base","standard":{"max_fee_gwei":0.02},"source":"rpc"},"x402_payment_required":true,"x402_facilitator":"https://api.cdp.coinbase.com/platform/v2/x402"}