{"id":"f4a06cfd-6f2e-4c24-a725-844335608ca4","shortId":"49Hmf3","kind":"x402","title":"Curve Finance APY data via x402 micropayment on Base, $0.02 per request.","tagline":"Curve Finance APY data via x402 micropayment on Base, $0.02 per request.","description":"This endpoint provides Curve Finance APY (annual percentage yield) data through an x402-gated API at `https://lowpaymentfee.com/api/v1/defi/curve/apy`. Each request costs $0.02 in USDC on the Base network, with no API keys, rate limits, or subscriptions required — callers simply attach an x402 payment header to each POST request.\n\nThe endpoint is part of a broader suite of pay-per-call APIs offered by lowpaymentfee.com spanning DeFi data, analytics, AI/ML inference, finance, and utility services, all priced at $0.02 per request. The x402 challenge confirms the endpoint is live, accepting USDC (contract `0x8335…2913`) on Base with a maximum amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). The payment timeout is 300 seconds.\n\nDocumentation is extremely sparse — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no example request/response payloads, and no description of the response format beyond the `application/json` MIME type declared in the x402 challenge. The specific fields returned (e.g., pool names, APY percentages, TVL) are unknown and must be discovered by making a paid call.","tags":[],"capabilities":["defi-data","curve-finance-apy","x402-payment","usdc-base","pay-per-request","json-api"],"categories":["defi","finance"],"synonyms":["Curve APY","Curve Finance yield","DeFi APY data","Curve pool returns","yield farming data","Curve protocol analytics","DeFi yield API"],"warnings":["No OpenAPI or schema documentation available — response format is unknown","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no technical content","The specific endpoint /api/v1/defi/curve/apy is not listed on the provider's homepage; it may be undocumented or experimental","No example request or response payloads could be obtained without making a paid call"],"endpointUrl":"https://lowpaymentfee.com/api/v1/defi/curve/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/curve/apy","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documentation, no example requests or responses, and no description of what fields the endpoint actually returns. Effectively a stub 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'0.02':10,22,48,105,133 '000':129 '0x8335':119 '20':128 '2913':120 '300':143 '6':137 'Curve APY' 'Curve Finance yield' 'Curve pool returns' 'Curve protocol analytics' 'DeFi APY data' 'DeFi yield API' 'accept':116 'ai/ml':96 'amount':126 'analyt':95 'annual':31 'api':3,15,30,40,57,88,153,200 'application/json':185 'attach':66 'base':9,21,53,122,130 'beyond':183 'broader':81 'call':87,213 'caller':64 'challeng':110,192 'confirm':111 'connect':159 'contract':118 'cost':47 'curv':1,13,28 'curve-finance-apy' 'data':4,16,34,94 'decim':138 'declar':188 'defi':93 'defi-data' 'descript':178 'detail':166 'discov':208 'doc':150 'document':145 'e.g':197 'endpoint':26,76,113 'exampl':173 'extrem':147 'field':195 'financ':2,14,29,98 'format':182 'gate':39 'given':134 'header':70 'i.e':132 'infer':97 'json-api' 'key':58 'limit':60 'live':115 'lowpaymentfee.com':43,91 'lowpaymentfee.com/api/v1/defi/curve/apy':42 'make':210 'maximum':125 'micropay':7,19 'mime':186 'must':206 'name':199 'network':54 'offer':89 'openapi':170 'page':154 'paid':212 'part':78 'pay':85 'pay-per-cal':84 'pay-per-request' 'payload':175 'payment':69,140 'per':11,23,86,106 'percentag':32,201 'pool':198 'post':73 'price':103,151 'prompt':161 'provid':27 'rate':59 'render':156 'request':12,24,46,74,107 'request/response':174 'requir':63 'respons':181 'return':196 'schema':171 'second':144 'servic':101 'simpli':65 'span':92 'spars':148 'specif':194 'subscript':62 'suit':82 'technic':165 'timeout':141 'tvl':202 'type':187 'unit':131 'unknown':204 'usdc':50,117,135 'usdc-base' 'util':100 'via':5,17 'wallet':160 'x402':6,18,38,68,109,191 'x402-gated':37 'x402-payment' 'yield':33 'yield farming data'","prices":[{"id":"da4f10c7-2520-4167-86b6-83ea610fa9d7","listingId":"f4a06cfd-6f2e-4c24-a725-844335608ca4","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/curve/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":"2026-04-19T12:29:44.553Z"}],"sources":[{"listingId":"f4a06cfd-6f2e-4c24-a725-844335608ca4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/defi/curve/apy","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-19T12:29:44.553Z","lastSeenAt":"2026-04-22T19:32:38.298Z"}],"details":{"listingId":"f4a06cfd-6f2e-4c24-a725-844335608ca4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/defi/curve/apy \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_token>\"","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","source_url":"https://lowpaymentfee.com/api/v1/defi/curve/apy"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/defi/curve/apy"},{"claim":"The provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/defi/curve/apy"}],"useCases":["Fetching current Curve Finance pool APYs for yield-farming dashboards","Comparing DeFi yields across protocols by pulling Curve APY data programmatically","Automated portfolio rebalancing agents that need real-time Curve yield information","Research and analytics on historical or current Curve pool performance"],"bestFor":["Agents or bots needing on-demand Curve APY data without API key management","Developers building DeFi dashboards who prefer pay-per-call pricing","Low-volume consumers who want no subscription commitment for DeFi data"],"notFor":["High-frequency trading systems that need sub-second latency and free bulk access","Users who need comprehensive Curve protocol data beyond APY (e.g., swap routing, on-chain events)","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:23.613Z"},"updatedAt":"2026-04-22T19:32:38.298Z"}}