{"id":"5efed241-e8cc-4660-ae57-aefcdb2e5dd6","shortId":"jHNLCH","kind":"x402","title":"Multi-chain gas price lookup via x402 micropayment — part of a 26-endpoint DeFi intelligence API.","tagline":"Multi-chain gas price lookup via x402 micropayment — part of a 26-endpoint DeFi intelligence API.","description":"The `/defi/gas` endpoint on the DeFi Intelligence API at defi.hugen.tokyo returns current gas prices for one or more EVM chains. You supply a comma-separated list of chain IDs (e.g., `1,137,8453` for Ethereum, Polygon, and Base) and receive standard, fast, and instant gas-price tiers for each chain. The endpoint is part of a broader suite of 26 DeFi security and data endpoints covering token audits, rugpull detection, bridge routing, protocol analytics, TVL, DEX volume, and more.\n\nPayment is handled via the x402 protocol: each call costs $0.01 USDC on Base. No API keys or rate limits are required — you simply attach an x402 payment header to each request. Alternative access methods are available including a broker API (with a free $0.05 credit), an MCP server at mcp.hugen.tokyo, and a Python SDK (`x402-pay`). The endpoint was confirmed live, returning a 402 challenge with sample gas data for Ethereum and Polygon.\n\nThe API is documented via an OpenAPI 3.1 spec served at `/openapi.json` and interactive Swagger docs at `/docs`. Response schemas for the gas endpoint are not explicitly defined in the OpenAPI spec (the 200 response schema is empty), but the 402 challenge includes a sample showing per-chain objects with `standard`, `fast`, and `instant` fields containing gas price values.","tags":[],"capabilities":["gas-price-lookup","multi-chain-evm","x402-micropayment","defi-data","real-time-gas"],"categories":["defi","blockchain"],"synonyms":["gas tracker","gas fees","gas oracle","EVM gas prices","chain gas cost","gwei lookup","network fee estimator","gas station"],"warnings":["Response schema for /defi/gas is not defined in the OpenAPI spec — the 200 response schema is empty.","Sample gas data in the 402 challenge may be illustrative rather than a guaranteed response format.","Root URL returns 404; no standalone documentation, pricing, or README pages exist.","Units of gas price values (gwei, wei, or other) are not documented."],"endpointUrl":"https://defi.hugen.tokyo/defi/gas","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x29322Ea7EcB34aA6164cb2ddeB9CE650902E4f60","amount":"5000","scheme":"exact","network":"eip155:8453","maxTimeoutSeconds":300},{"asset":"EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v","extra":{"feePayer":"GVJJ7rdGiXr5xaYbRwRbjfaJL7fmwRygFi1H6aGqDveb"},"payTo":"4du4AfkjJEwch2zk3shkPJVZfyJHNDnNjEWC6AboaS5Z","amount":"5000","scheme":"exact","network":"solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp","maxTimeoutSeconds":300}]},"qualityScore":"0.620","qualityRationale":"The endpoint is live (402 challenge confirmed) with a full OpenAPI 3.1 spec covering all 26 endpoints. However, the response schema for /defi/gas is empty (no formal JSON schema), and the only response example comes from the 402 challenge payload. No dedicated pricing page or detailed documentation beyond the Swagger UI was 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'/docs':208 '/openapi.json':202 '0.01':126 '0.05':160 '1':66 '137':67 '200':224 '26':13,30,96 '3.1':198 '402':181,231 '8453':68 'EVM gas prices' 'access':149 'altern':148 'analyt':110 'api':17,34,42,131,156,192 'attach':140 'audit':104 'avail':152 'base':73,129 'bridg':107 'broader':93 'broker':155 'call':124 'chain':3,20,54,63,86,239 'chain gas cost' 'challeng':182,232 'comma':59 'comma-separ':58 'confirm':177 'contain':247 'cost':125 'cover':102 'credit':161 'current':46 'data':100,186 'defi':15,32,40,97 'defi-data' 'defi.hugen.tokyo':44 'defin':218 'detect':106 'dex':112 'doc':206 'document':194 'e.g':65 'empti':228 'endpoint':14,31,37,88,101,175,214 'ethereum':70,188 'evm':53 'explicit':217 'fast':77,243 'field':246 'free':159 'gas':4,21,47,81,185,213,248 'gas fees' 'gas oracle' 'gas station' 'gas tracker' 'gas-pric':80 'gas-price-lookup' 'gwei lookup' 'handl':118 'header':144 'id':64 'includ':153,233 'instant':79,245 'intellig':16,33,41 'interact':204 'key':132 'limit':135 'list':61 'live':178 'lookup':6,23 'mcp':163 'mcp.hugen.tokyo':166 'method':150 'micropay':9,26 'multi':2,19 'multi-chain':1,18 'multi-chain-evm' 'network fee estimator' 'object':240 'one':50 'openapi':197,221 'part':10,27,90 'pay':173 'payment':116,143 'per':238 'per-chain':237 'polygon':71,190 'price':5,22,48,82,249 'protocol':109,122 'python':169 'rate':134 'real-time-gas' 'receiv':75 'request':147 'requir':137 'respons':209,225 'return':45,179 'rout':108 'rugpul':105 'sampl':184,235 'schema':210,226 'sdk':170 'secur':98 'separ':60 'serv':200 'server':164 'show':236 'simpli':139 'spec':199,222 'standard':76,242 'suit':94 'suppli':56 'swagger':205 'tier':83 'token':103 'tvl':111 'usdc':127 'valu':250 'via':7,24,119,195 'volum':113 'x402':8,25,121,142,172 'x402-micropayment' 'x402-pay':171","prices":[{"id":"331be2b3-e61f-4519-a5e4-7fad26baba07","listingId":"5efed241-e8cc-4660-ae57-aefcdb2e5dd6","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":null,"chain":"base","payTo":"0x29322Ea7EcB34aA6164cb2ddeB9CE650902E4f60","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x29322Ea7EcB34aA6164cb2ddeB9CE650902E4f60","amount":"5000","scheme":"exact","network":"eip155:8453","maxTimeoutSeconds":300},{"asset":"EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v","extra":{"feePayer":"GVJJ7rdGiXr5xaYbRwRbjfaJL7fmwRygFi1H6aGqDveb"},"payTo":"4du4AfkjJEwch2zk3shkPJVZfyJHNDnNjEWC6AboaS5Z","amount":"5000","scheme":"exact","network":"solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:37.702Z"}],"sources":[{"listingId":"5efed241-e8cc-4660-ae57-aefcdb2e5dd6","source":"x402_bazaar","sourceId":"https://defi.hugen.tokyo/defi/gas","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:37.702Z","lastSeenAt":"2026-04-22T05:32:30.001Z"}],"details":{"listingId":"5efed241-e8cc-4660-ae57-aefcdb2e5dd6","quickStartSnippet":"# Using the x402-pay Python SDK\npip install x402-pay\n\nimport x402_pay\nresp = x402_pay.get('https://defi.hugen.tokyo/defi/gas?chains=1,137,8453')\nprint(resp.json())","exampleRequest":null,"exampleResponse":{"polygon":{"fast":"80","instant":"120","standard":"50"},"ethereum":{"fast":"45","instant":"60","standard":"30"}},"schema":null,"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The API describes itself as '26 DeFi security and data endpoints — token audits, bridge routing, protocol analytics' with x402 payment per call.","source_url":"https://defi.hugen.tokyo/docs"},{"claim":"The /defi/gas endpoint accepts a 'chains' query parameter with comma-separated chain IDs.","source_url":"https://defi.hugen.tokyo/openapi.json"},{"claim":"Payment is $0.01 USDC on Base per call, with broker, MCP, and SDK alternatives available.","source_url":"https://defi.hugen.tokyo/defi/gas"},{"claim":"The 402 challenge includes sample gas data with standard/fast/instant tiers for Ethereum and Polygon.","source_url":"https://defi.hugen.tokyo/defi/gas"},{"claim":"A Python SDK 'x402-pay' is available for one-line access.","source_url":"https://defi.hugen.tokyo/defi/gas"}],"useCases":["Querying current gas prices across multiple EVM chains before submitting transactions","Building a gas-cost comparison dashboard for Ethereum, Polygon, Base, and BSC","Automating transaction timing by monitoring gas tiers (standard/fast/instant)","Feeding gas estimates into a DeFi agent that optimizes bridge or swap execution","Displaying real-time gas fees in a wallet or portfolio app"],"bestFor":["Agents or bots that need real-time gas prices across multiple chains in a single call","Developers who want DeFi data without managing API keys or upstream service accounts","Low-volume, pay-per-call usage at $0.01 per request via x402"],"notFor":["High-frequency trading systems needing sub-second gas updates (pay-per-call overhead may be prohibitive)","Non-EVM chains — the gas endpoint uses numeric chain IDs for EVM networks only"],"kindDetails":{},"updatedAt":"2026-04-22T02:19:08.837Z"}}