{"service":"gas-fees","version":"1.0.0","title":"Gas price and fees","description":"Use when you need the current gas price, an ethereum gas fee estimate before a transaction, or to compare gas fees across chains. Do not use for gas units of a given transaction, gas history or chains beyond Ethereum, Base and Solana. Returns JSON with the gas price and gas fees on Ethereum and Base (base fee, slow, standard and fast EIP-1559 fees in gwei, transfer cost) plus Solana priority fees for 0.002 USDC per call. Typical response time 1500 ms (p95). Category: Data.","paid":{"method":"POST","url":"https://x402-gateway.blackwoodstate8.workers.dev/v1/gas-fees","scheme":"exact","network":"eip155:8453","asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","amount":"2000","amountUsdc":"0.002","payTo":"0x1cB6AaC2eAbF9644a22f17B0E758061f8412a7E1","maxTimeoutSeconds":60},"input":{"schema":{"type":"object","properties":{"chains":{"description":"Chains to read (ethereum, base and solana when omitted), e.g. [\"base\", \"ethereum\"]","minItems":1,"maxItems":3,"type":"array","items":{"type":"string","enum":["ethereum","base","solana"]}}}},"example":{}},"output":{"schema":{"type":"object","properties":{"ethereum":{"anyOf":[{"type":"object","properties":{"chainId":{"type":"number"},"blockNumber":{"type":"number"},"baseFeeGwei":{"type":"number"},"nextBaseFeeGwei":{"type":"number"},"gasPriceGwei":{"type":"number"},"priorityFeeGwei":{"type":"object","properties":{"slow":{"type":"number"},"standard":{"type":"number"},"fast":{"type":"number"}},"required":["slow","standard","fast"],"additionalProperties":false},"maxFeeGwei":{"type":"object","properties":{"slow":{"type":"number"},"standard":{"type":"number"},"fast":{"type":"number"}},"required":["slow","standard","fast"],"additionalProperties":false},"transferCostEth":{"type":"object","properties":{"slow":{"type":"number"},"standard":{"type":"number"},"fast":{"type":"number"}},"required":["slow","standard","fast"],"additionalProperties":false}},"required":["chainId","blockNumber","baseFeeGwei","nextBaseFeeGwei","gasPriceGwei","priorityFeeGwei","maxFeeGwei","transferCostEth"],"additionalProperties":false},{"type":"null"}]},"base":{"anyOf":[{"type":"object","properties":{"chainId":{"type":"number"},"blockNumber":{"type":"number"},"baseFeeGwei":{"type":"number"},"nextBaseFeeGwei":{"type":"number"},"gasPriceGwei":{"type":"number"},"priorityFeeGwei":{"type":"object","properties":{"slow":{"type":"number"},"standard":{"type":"number"},"fast":{"type":"number"}},"required":["slow","standard","fast"],"additionalProperties":false},"maxFeeGwei":{"type":"object","properties":{"slow":{"type":"number"},"standard":{"type":"number"},"fast":{"type":"number"}},"required":["slow","standard","fast"],"additionalProperties":false},"transferCostEth":{"type":"object","properties":{"slow":{"type":"number"},"standard":{"type":"number"},"fast":{"type":"number"}},"required":["slow","standard","fast"],"additionalProperties":false}},"required":["chainId","blockNumber","baseFeeGwei","nextBaseFeeGwei","gasPriceGwei","priorityFeeGwei","maxFeeGwei","transferCostEth"],"additionalProperties":false},{"type":"null"}]},"solana":{"anyOf":[{"type":"object","properties":{"slot":{"type":"number"},"baseFeeLamportsPerSignature":{"type":"number"},"priorityFeeMicroLamportsPerCu":{"type":"object","properties":{"min":{"type":"number"},"low":{"type":"number"},"medium":{"type":"number"},"high":{"type":"number"},"veryHigh":{"type":"number"}},"required":["min","low","medium","high","veryHigh"],"additionalProperties":false}},"required":["slot","baseFeeLamportsPerSignature","priorityFeeMicroLamportsPerCu"],"additionalProperties":false},{"type":"null"}]},"updatedAt":{"type":"string"},"note":{"type":"string"},"next":{"type":"object","properties":{"service":{"type":"string","description":"Service id of the suggested next paid call"},"tool":{"type":"string","description":"MCP tool name of the same call"},"method":{"type":"string","enum":["GET","POST"]},"url":{"type":"string","description":"Paid route of the next call"},"useWhen":{"type":"string","description":"When the next call is the right one"},"sample":{"type":"string","description":"Free fixed sample of the whole family"}},"required":["service","tool","method","url","useWhen","sample"],"additionalProperties":false,"description":"Suggested next paid call in the same family (call it in a loop when the task continues)"}},"required":["ethereum","base","solana","updatedAt","note"],"additionalProperties":false},"example":{"ethereum":{"chainId":1,"blockNumber":26216462,"baseFeeGwei":0.0413101,"nextBaseFeeGwei":0.0374734,"gasPriceGwei":0.0413101,"priorityFeeGwei":{"slow":0.000024942,"standard":0.00134048,"fast":1},"maxFeeGwei":{"slow":0.0749717,"standard":0.0762873,"fast":1.07495},"transferCostEth":{"slow":7.87465e-7,"standard":8.15091e-7,"fast":0.0000217869}},"base":{"chainId":8453,"blockNumber":52750593,"baseFeeGwei":0.005,"nextBaseFeeGwei":0.005,"gasPriceGwei":0.006,"priorityFeeGwei":{"slow":0,"standard":0.001,"fast":0.005},"maxFeeGwei":{"slow":0.01,"standard":0.011,"fast":0.015},"transferCostEth":{"slow":1.05e-7,"standard":1.26e-7,"fast":2.1e-7}},"solana":{"slot":458268792,"baseFeeLamportsPerSignature":5000,"priorityFeeMicroLamportsPerCu":{"min":0,"low":0,"medium":2673,"high":50000,"veryHigh":2000000}},"updatedAt":"2026-10-18T02:28:53.602Z","note":"Gas in gwei. EIP-1559 tiers are the median 10th, 50th and 90th percentile priority fees of the last 20 blocks; max fee = 2 x next base fee + priority fee; transfer cost is a 21,000-gas ETH transfer. Solana: priority fee levels in micro-lamports per compute unit, on top of 5,000 lamports per signature."}},"mcp":{"url":"https://x402-gateway.blackwoodstate8.workers.dev/mcp","tool":"blackwood_gas_fees"},"openapi":"https://x402-gateway.blackwoodstate8.workers.dev/openapi.json","status":"https://x402-gateway.blackwoodstate8.workers.dev/status.json"}