{"uid":"cap_yTAt6y5tHHP7Tdsr1hwoA","slug":"httpay-gas-optimizer-api-ae284f56","name":"HTTPay Gas Optimizer API","description":"Gas optimizer for Base — current gas price, cost estimates for common operations, and optimal timing recommendation (live on-chain data)","url":"https://httpay.xyz/api/gas-optimizer","method":"POST","headers":{},"bodySchema":null,"responseSchema":{"type":"json","example":{}},"example":{"request":{"network":"base","transaction_type":"token_swap","estimated_gas_units":150000},"response":{"meta":{"x402":true,"poweredBy":"Alfred Zhang 🫡"},"note":"Costs estimated using latest baseFee + median priority fee from last 5 blocks. Actual costs may vary.","chains":[{"ok":true,"chain":"Base","chainId":8453,"baseFeeGwei":"0.0050","estimatedCosts":{"swap":{"costUsd":"$0.002015","gasUnits":200000},"erc20Transfer":{"costUsd":"$0.000655","gasUnits":65000},"contractDeploy":{"costUsd":"$0.020150","gasUnits":2000000},"nativeTransfer":{"costUsd":"$0.000212","gasUnits":21000}},"congestionLevel":"🟢 Low","priorityFeeGwei":"0.0010","suggestedMaxFeeGwei":"0.0060"},{"ok":false,"chain":"Ethereum","error":"Unexpected token '<', \"<!DOCTYPE \"... is not valid JSON","chainId":1},{"ok":true,"chain":"Arbitrum","chainId":42161,"baseFeeGwei":"0.0200","estimatedCosts":{"swap":{"costUsd":"$0.006707","gasUnits":200000},"erc20Transfer":{"costUsd":"$0.002180","gasUnits":65000},"contractDeploy":{"costUsd":"$0.067073","gasUnits":2000000},"nativeTransfer":{"costUsd":"$0.000704","gasUnits":21000}},"congestionLevel":"🟢 Low","priorityFeeGwei":"0.0000","suggestedMaxFeeGwei":"0.0200"},{"ok":true,"chain":"Optimism","chainId":10,"baseFeeGwei":"0.0000","estimatedCosts":{"swap":{"costUsd":"$0.000000","gasUnits":200000},"erc20Transfer":{"costUsd":"$0.000000","gasUnits":65000},"contractDeploy":{"costUsd":"$0.000002","gasUnits":2000000},"nativeTransfer":{"costUsd":"$0.000000","gasUnits":21000}},"congestionLevel":"🟢 Low","priorityFeeGwei":"0.0000","suggestedMaxFeeGwei":"0.0000"}],"summary":"Cheapest for swap: Optimism at $0.000000. Ethereum mainnet is unknown congestion.","updatedAt":"2026-06-12T04:38:04.701Z","ethPriceUsd":1676.83,"recommendation":{"tip":"✅ Now is a relatively low-fee period (early UTC). Good time to transact.","swapCostThere":"$0.000000","currentUtcHour":4,"currentlyGoodTime":true,"cheapestChainForSwap":"Optimism"},"bestTimeWindows":[{"window":"02:00–06:00 UTC","description":"Late night US / early morning Europe — historically lowest activity"},{"window":"10:00–12:00 UTC","description":"US pre-market, Europe mid-morning — moderate activity"},{"window":"Weekend early UTC","description":"Saturdays 03:00–08:00 UTC often see 30–50% lower fees"}]}},"exampleRequest":{"network":"base","transaction_type":"token_swap","estimated_gas_units":150000},"tags":["x402"],"displayCostAmount":"0.01","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"settled","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_59pR_i2rOJdxoHp1IZwOr","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":null,"unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns gas optimization recommendations for Ethereum/Base transactions, helping minimize transaction costs via pay-per-call x402 micropayments.","exampleAgentPrompt":"What's the optimal gas price I should use right now to minimize fees for a token swap transaction on Base — I want to avoid overpaying but still get it confirmed quickly.","exampleUseCases":null,"resultDescription":"Returns gas optimization data including recommended gas price, fee estimates, and cost-saving suggestions for transactions on Base network, delivered as JSON.","failureModes":["Payment not provided — returns 402 with x402 payment required header","Network congestion data unavailable — may return stale or empty recommendations","Invalid or missing query parameters — returns 400 bad request","Upstream gas oracle unavailable — returns 503 or empty example response"],"whenToPreferThis":"Use this endpoint when you need real-time gas optimization for Base or EVM-compatible transactions and want to pay per call via USDC micropayment without managing API keys or subscriptions. Prefer over alternatives when working in a crypto-native agent context that already supports x402 payment protocol.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-13T12:51:51.674Z","isFirstParty":false}