{"id":"8f081da7-eac4-40a6-9b3b-dadc2be3405e","shortId":"A8qbFe","kind":"x402","title":"Simulated DeFi yield opportunity finder, pay-per-call via x402 USDC on Base","tagline":"Simulated DeFi yield opportunity finder, pay-per-call via x402 USDC on Base","description":"The `/api/yield-finder` endpoint on httpay.xyz returns simulated DeFi yield opportunities across protocols and chains. It is a simple GET endpoint requiring no query parameters — you call it, pay $0.02 in USDC on Base via the x402 protocol, and receive a JSON response with yield data. The endpoint also supports MPP (Machine Payments Protocol) settlement via pathUSD on Tempo at $0.02 per call. A free demo mode is available by appending `?demo=true` (limited to 10 calls per IP per hour).\n\nhttpay.xyz is a pay-per-call API marketplace hosting 307+ endpoints across categories like crypto/finance, AI, web scraping, and utilities. No API keys or subscriptions are needed — payment is handled inline via the HTTP 402 challenge-response flow. The platform is live on Base L2 with real USDC transactions settling on-chain. An MCP server (`npx @httpay/mcp`) is available for integration with Claude Desktop, Cursor, or other MCP-compatible agents.\n\nImportant caveat: the endpoint is explicitly described as \"simulated\" in both its title and the x402 challenge metadata. The yield opportunities returned are not sourced from live on-chain data. No documentation exists beyond the landing page description, so the exact structure and content of the response is unclear.","tags":[],"capabilities":["defi-yield-finder","simulated-data","x402-micropayment","usdc-base-settlement","mpp-tempo-settlement","pay-per-call","no-auth-required","demo-mode","mcp-server-compatible","json-response"],"categories":["crypto","defi"],"synonyms":["yield farming finder","DeFi yield aggregator","yield opportunities API","best yield rates","DeFi protocol yields","yield comparison","crypto yield API"],"warnings":["Data is explicitly labeled as 'simulated' — not real DeFi yield data","No documentation available (/docs returns 404)","Response schema is unknown beyond a trivial example object with only a 'description' field","robots.txt disallows /api/ crawling (except specific whitelisted paths, not including this one)"],"endpointUrl":"https://httpay.xyz/api/yield-finder","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","chainId":8453,"version":"2"},"payTo":"0x5f5d6FcB315871c26F720dc6fEf17052dD984359","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://httpay.xyz/api/yield-finder","extensions":{"bazaar":{"info":{"input":{"type":"http","method":"GET","queryParams":{}},"output":{"type":"json","example":{"description":"Find the best yield opportunities (simulated)"}}},"schema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","properties":{}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}}}},"description":"Find the best yield opportunities (simulated)","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true},"output":{"type":"json","example":{"description":"Find the best yield opportunities (simulated)"}}},"maxAmountRequired":"20000","maxTimeoutSeconds":60}]},"qualityScore":"0.450","qualityRationale":"The endpoint is live (402 challenge captured) with clear pricing ($0.02 USDC on Base), but the response schema is essentially unknown — the only example provided is a single description string. No dedicated docs page exists (/docs returns 404). The data is explicitly simulated, limiting real-world 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'0.02':57,88 '10':103 '307':119 '402':144 'DeFi protocol yields' 'DeFi yield aggregator' 'across':39,121 'agent':182 'ai':125 'also':76 'api':116,131 'append':98 'avail':96,170 'base':14,28,61,154 'best yield rates' 'beyond':217 'call':9,23,54,90,104,115 'categori':122 'caveat':184 'chain':42,163,212 'challeng':146,199 'challenge-respons':145 'claud':174 'compat':181 'content':227 'crypto yield API' 'crypto/finance':124 'cursor':176 'data':73,213 'defi':2,16,36 'defi-yield-finder' 'demo':93,99 'demo-mode' 'describ':189 'descript':221 'desktop':175 'document':215 'endpoint':31,48,75,120,186 'exact':224 'exist':216 'explicit':188 'finder':5,19 'flow':148 'free':92 'get':47 'handl':139 'host':118 'hour':108 'http':143 'httpay.xyz':33,109 'httpay/mcp':168 'import':183 'inlin':140 'integr':172 'ip':106 'json':69 'json-response' 'key':132 'l2':155 'land':219 'like':123 'limit':101 'live':152,209 'machin':79 'marketplac':117 'mcp':165,180 'mcp-compat':179 'mcp-server-compatible' 'metadata':200 'mode':94 'mpp':78 'mpp-tempo-settlement' 'need':136 'no-auth-required' 'npx':167 'on-chain':161,210 'opportun':4,18,38,203 'page':220 'paramet':52 'pathusd':84 'pay':7,21,56,113 'pay-per-cal':6,20,112 'pay-per-call' 'payment':80,137 'per':8,22,89,105,107,114 'platform':150 'protocol':40,65,81 'queri':51 'real':157 'receiv':67 'requir':49 'respons':70,147,230 'return':34,204 'scrape':127 'server':166 'settl':160 'settlement':82 'simpl':46 'simul':1,15,35,191 'simulated-data' 'sourc':207 'structur':225 'subscript':134 'support':77 'tempo':86 'titl':195 'transact':159 'true':100 'unclear':232 'usdc':12,26,59,158 'usdc-base-settlement' 'util':129 'via':10,24,62,83,141 'web':126 'x402':11,25,64,198 'x402-micropayment' 'yield':3,17,37,72,202 'yield comparison' 'yield farming finder' 'yield opportunities API'","prices":[{"id":"cd6382e6-c3dc-4e01-8e87-ac103ae4f563","listingId":"8f081da7-eac4-40a6-9b3b-dadc2be3405e","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x5f5d6FcB315871c26F720dc6fEf17052dD984359","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","chainId":8453,"version":"2"},"payTo":"0x5f5d6FcB315871c26F720dc6fEf17052dD984359","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://httpay.xyz/api/yield-finder","extensions":{"bazaar":{"info":{"input":{"type":"http","method":"GET","queryParams":{}},"output":{"type":"json","example":{"description":"Find the best yield opportunities 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(simulated)"}}},"maxAmountRequired":"20000","maxTimeoutSeconds":60}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":60},"createdAt":"2026-04-21T18:32:35.000Z"}],"sources":[{"listingId":"8f081da7-eac4-40a6-9b3b-dadc2be3405e","source":"x402_bazaar","sourceId":"https://httpay.xyz/api/yield-finder","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:35.000Z","lastSeenAt":"2026-04-22T04:02:50.513Z"}],"details":{"listingId":"8f081da7-eac4-40a6-9b3b-dadc2be3405e","quickStartSnippet":"# Free demo (no payment needed, 10 calls/IP/hour)\ncurl \"https://httpay.xyz/api/yield-finder?demo=true\"\n\n# With x402 payment (Node.js)\nimport { withPayment } from \"x402-fetch\";\nconst res = await withPayment(\n  fetch(\"https://httpay.xyz/api/yield-finder\"),\n  wallet\n);","exampleRequest":null,"exampleResponse":{"description":"Find the best yield opportunities 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