{"endpoint":{"id":"1514f800ed39c570","rail":"x402","source":"payai","url":"https://x402-catalog-history.ai-business-surface.workers.dev/gas","method":"GET","host":"x402-catalog-history.ai-business-surface.workers.dev","serviceName":"x402-crosschain-gas","description":"Stop opening five explorers to price one transaction: one GET returns what each chain is charging for gas right now — for base, eth, arbitrum, optimism and polygon: the current gas price in gwei (with the raw wei the RPC returned), the latest block's base fee, the priority fee a 50th-percentile transaction actually paid across the last five blocks, the next block's base fee under the EIP-1559 formula, the block number and timestamp those numbers came from, and the public RPC that answered. curl: GET /gas?chains=base,eth (omit chains for all five; aliases like ethereum or arb work). Response: {gas:[{chain,chain_id,gas_price_gwei,base_fee_gwei,priority_fee_gwei,block:{number,timestamp},source_rpc,fetched_at}]}. Every value is a measurement from a public RPC, never an estimate: a chain no RPC answered for is listed in chains_unavailable with the reason, and a figure that could not be measured is null. Values are cached for 15 seconds, and each one carries the fetched_at of the measurement","tags":["gas","gas-price","multi-chain","fees","base"],"platforms":["ethereum","base","arbitrum","optimism","polygon"],"tasks":["transactions","blocks","rpc"],"categoryId":"onchain-data","priceUsd":0.001,"priceScheme":"exact","network":"eip155:8453","payTo":"0x6f60659390aDA1D02B14024d8c9d0C889f2F89c3","testnetOnly":false,"calls30d":null,"payers30d":null,"lastCalledAt":null,"startFeeUsd":null,"platformUsageExtra":null,"reportedSuccess30d":null,"pageUrl":null,"batchMax":null,"exampleCount":null,"unitsPerCharge":1,"unitBasis":"call","unitPriceUsd":0.001,"firstSeenAt":"2026-10-14T06:07:13.876Z","lastSeenAt":"2026-10-14T06:07:13.876Z","lastProbedAt":"2026-10-14T06:15:08.181Z","embeddedHash":"f3fb77bcc1e175d9ea6e137a48ecd6cf497c72d85ebe10ccc596ad72b9d8ce07"},"score":{"endpointId":"1514f800ed39c570","computedAt":"2026-10-14T08:45:21.525Z","score":null,"grade":null,"uptime7d":1,"latencyP50Ms":119,"probeCount7d":1,"flags":["no-usage-data"]},"recentProbes":[{"id":82670,"endpointId":"1514f800ed39c570","checkedAt":"2026-10-14T06:15:08.326Z","statusCode":402,"latencyMs":119,"valid402":true,"priceUsd":0.001,"payTo":"0x6f60659390aDA1D02B14024d8c9d0C889f2F89c3","error":null,"mcpOutcome":null,"mcpProtocol":null}],"siblings":{"total":0,"rows":[]},"tools":null}