{"uid":"cap_QuJCb0xyuoVvbQClx1tJp","slug":"x402-onchainexpat-com-8cd655bf","name":"x402.onchainexpat.com Gas Oracle","description":"Real-time gas price estimates and fee recommendations across supported chains (e.g., Base and Solana) for accurate transaction cost calculations.","url":"https://x402.onchainexpat.com/api/x402-crypto/gas-oracle","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"chain":{"type":"string","description":"Blockchain (default: ethereum)"}}},"responseSchema":{"type":"object","properties":{"data":{"type":"object","properties":{"chain":{"type":"string"},"eip1559":{"type":"object","description":"Base fee and priority fees in gwei"},"gas_prices":{"type":"object","description":"Gas prices for low/medium/high/instant with gwei, wei, and USD cost"},"network_status":{"type":"object","description":"Congestion level and description"},"recommendation":{"type":"object","description":"Action, reason, and urgency"}}},"success":{"type":"boolean"}}},"example":{"request":{"chain":"base"},"response":{"data":{"chain":"base","source":"rpc","eip1559":{"base_fee_wei":5000000,"base_fee_gwei":0.005,"priority_fee_low":0.001,"priority_fee_high":0.011149,"priority_fee_medium":0.00109},"chain_name":"Base","gas_prices":{"low":{"wei":5175000,"gwei":0.005175,"estimated_seconds":180,"transfer_cost_eth":1.1e-7,"transfer_cost_usd":0.0002},"high":{"wei":16149000,"gwei":0.016149,"estimated_seconds":15,"transfer_cost_eth":3.4e-7,"transfer_cost_usd":0.0006},"medium":{"wei":6090000,"gwei":0.00609,"estimated_seconds":60,"transfer_cost_eth":1.3e-7,"transfer_cost_usd":0.0002},"instant":{"wei":19378799,"gwei":0.019379,"estimated_seconds":6,"transfer_cost_eth":4.1e-7,"transfer_cost_usd":0.0007}},"eth_price_usd":1664.92,"native_symbol":"ETH","network_status":{"level":"low","gas_gwei":0.00609,"description":"Network is quiet"},"recommendation":{"action":"transact_now","reason":"Base has low transaction costs","urgency":"low"},"block_time_seconds":2},"cached":false,"success":true,"timestamp":"2026-06-13T04:28:58.176312+00:00"}},"exampleRequest":{"chain":"base"},"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_grHphZ35aNqZzmmmCFokC","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns real-time gas price estimates and fee recommendations (low/medium/high/instant tiers) for Base and Solana chains, including USD cost estimates and transaction timing guidance.","exampleAgentPrompt":"What are the current gas prices on Base — give me the low, medium, high, and instant fee tiers in gwei and USD, and tell me whether I should transact now or wait?","exampleUseCases":null,"resultDescription":"Returns a structured object with EIP-1559 base fee and priority fee tiers (low/medium/high/instant) in wei and gwei, estimated confirmation times in seconds, transfer costs in ETH and USD, current ETH price in USD, network status (e.g. 'low'/'medium'/'high'), a recommendation on whether to transact now, and the chain's block time.","failureModes":["Unsupported chain identifier returns an error or empty data","RPC node unavailability may cause stale or failed gas reads","Missing or malformed 'chain' field in request body results in 400 error","Cached:false indicates live fetch which may have higher latency under load"],"whenToPreferThis":"Use this endpoint when an AI agent needs real-time, chain-specific gas fee data with USD cost estimates and a human-readable transaction recommendation — especially for Base or Solana. Prefer over generic RPC calls when you need tiered fee suggestions (low/medium/high/instant) with confirmation time estimates and network congestion level already computed.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T06:41:46.193Z","isFirstParty":false}