{"id":"26eb86d9-1f6e-4f5b-9061-75ae5986c232","shortId":"x6mCNS","kind":"x402","title":"Yearn Finance APY data via x402 micropayment on Base, $0.02 per request.","tagline":"Yearn Finance APY data via x402 micropayment on Base, $0.02 per request.","description":"This endpoint returns Yearn Finance APY (Annual Percentage Yield) data through the x402 payment protocol. It is hosted on lowpaymentfee.com, a platform that offers a variety of pay-per-call APIs spanning DeFi, analytics, AI/ML, finance, and utility categories. Each request costs $0.02 in USDC on the Base network — no API keys, no rate limits, and no subscriptions required.\n\nThe specific endpoint `/api/v1/defi/yearn/apy` is a POST endpoint that accepts JSON and returns JSON. Payment is handled via the x402 protocol: callers attach an `X-PAYMENT` header containing a signed USDC payment of up to 20,000 base units (i.e., $0.02, since USDC uses 6 decimals) to the payee address on Base. The endpoint responds with Yearn vault APY information, though the exact response schema is not documented in the available materials.\n\nThe platform advertises a broad catalog of endpoints at the same $0.02 price point, including price feeds, gas estimates, sentiment analysis, text summarization, and more. Documentation pages (docs, pricing, README) appear to be behind a wallet-connect gate and did not yield substantive content during crawling, so detailed request/response schemas and field-level documentation are unavailable.","tags":[],"capabilities":["defi-apy-data","yearn-finance","x402-payment","usdc-base","pay-per-request","json-api"],"categories":["defi","finance"],"synonyms":["yearn vault APY","yearn finance yield","DeFi yield data","yearn APY API","yield farming rates","Yearn vaults","DeFi interest rates"],"warnings":["Documentation, pricing, and README pages are behind a wallet-connect gate and returned no useful content during crawl.","No request body schema or response schema is available — the exact fields returned are unknown.","The endpoint path suggests Yearn APY data but no details confirm the scope (which vaults, which chains, etc.)."],"endpointUrl":"https://lowpaymentfee.com/api/v1/defi/yearn/apy","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/defi/yearn/apy","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is live (402 challenge captured) with clear pricing ($0.02 USDC on Base), but documentation pages are gated behind wallet-connect and yielded no content. No request/response schema, no example payloads, and no detailed description of what fields the Yearn APY response contains. The listing is functional but essentially a stub in terms of developer 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'0.02':10,22,68,126,169 '000':122 '20':121 '6':130 'DeFi interest rates' 'DeFi yield data' 'Yearn vaults' 'accept':94 'address':135 'advertis':160 'ai/ml':60 'analysi':178 'analyt':59 'annual':31 'api':3,15,30,56,76,144 'appear':188 'attach':107 'avail':156 'base':9,21,73,123,137 'behind':191 'broad':162 'call':55 'caller':106 'catalog':163 'categori':64 'connect':195 'contain':113 'content':202 'cost':67 'crawl':204 'data':4,16,34 'decim':131 'defi':58 'defi-apy-data' 'detail':206 'doc':185 'document':153,183,213 'endpoint':26,87,92,139,165 'estim':176 'exact':148 'feed':174 'field':211 'field-level':210 'financ':2,14,29,61 'gas':175 'gate':196 'handl':101 'header':112 'host':42 'i.e':125 'includ':172 'inform':145 'json':95,98 'json-api' 'key':77 'level':212 'limit':80 'lowpaymentfee.com':44 'materi':157 'micropay':7,19 'network':74 'offer':48 'page':184 'pay':53 'pay-per-cal':52 'pay-per-request' 'paye':134 'payment':38,99,111,117 'per':11,23,54 'percentag':32 'platform':46,159 'point':171 'post':91 'price':170,173,186 'protocol':39,105 'rate':79 'readm':187 'request':12,24,66 'request/response':207 'requir':84 'respond':140 'respons':149 'return':27,97 'schema':150,208 'sentiment':177 'sign':115 'sinc':127 'span':57 'specif':86 'subscript':83 'substant':201 'summar':180 'text':179 'though':146 'unavail':215 'unit':124 'usdc':70,116,128 'usdc-base' 'use':129 'util':63 'varieti':50 'vault':143 'via':5,17,102 'wallet':194 'wallet-connect':193 'x':110 'x-payment':109 'x402':6,18,37,104 'x402-payment' 'yearn':1,13,28,142 'yearn APY API' 'yearn finance yield' 'yearn vault APY' 'yearn-finance' 'yield':33,200 'yield farming rates'","prices":[{"id":"345ed17a-0c21-4c0c-95be-b2c4ead3399b","listingId":"26eb86d9-1f6e-4f5b-9061-75ae5986c232","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/defi/yearn/apy","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:09.722Z"}],"sources":[{"listingId":"26eb86d9-1f6e-4f5b-9061-75ae5986c232","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/defi/yearn/apy","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:09.722Z","lastSeenAt":"2026-04-22T02:31:47.727Z"}],"details":{"listingId":"26eb86d9-1f6e-4f5b-9061-75ae5986c232","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/defi/yearn/apy \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-signed-payment>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns HTTP 402 with an x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/defi/yearn/apy"},{"claim":"maxAmountRequired is 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), which equals $0.02","source_url":"https://lowpaymentfee.com/api/v1/defi/yearn/apy"},{"claim":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying current Yearn Finance vault APYs for portfolio dashboards","Comparing DeFi yield opportunities programmatically","Feeding Yearn APY data into automated yield-farming strategies","Displaying real-time DeFi yield information in agent-driven workflows"],"bestFor":["Agents or bots that need on-demand DeFi yield data without API key management","Developers building yield aggregator dashboards","Automated trading strategies that compare Yearn vault returns"],"notFor":["Historical time-series APY analysis (no evidence of historical data support)","Users who need free or high-volume bulk data (each call costs $0.02)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:23.131Z"},"updatedAt":"2026-04-22T02:31:47.727Z"}}