{"id":"1f8467b0-a174-42bb-837b-c9f4345f6314","shortId":"gm4qL8","kind":"x402","title":"Get the current YFI token price via x402 micropayment on Base for $0.02 per request.","tagline":"Get the current YFI token price via x402 micropayment on Base for $0.02 per request.","description":"This endpoint returns the current price of YFI (yearn.finance) in JSON format, paid per-request via the x402 protocol on the Base network. It is part of a broader suite of APIs offered by lowpaymentfee.com covering data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per call settled in USDC on Base.\n\nThe x402 challenge confirms the endpoint is live and accepts POST requests. Payment is made via an exact-scheme USDC transfer (contract 0x8335…2913 on Base) to the provider's address. The max amount required is 20,000 base units, which equals $0.02 USD (USDC uses 6 decimals). No API keys or rate limits are advertised; access is granted immediately upon valid x402 payment. The response MIME type is application/json.\n\nDocumentation beyond the landing page is essentially empty — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no example request/response payloads, and no description of the response schema. The endpoint path suggests it returns a price quote for the YFI token, but the exact response fields are unknown.","tags":[],"capabilities":["token-price-lookup","yfi-price","x402-payment","usdc-base","per-request-micropayment","crypto-market-data","json-api"],"categories":["finance","crypto"],"synonyms":["YFI price API","yearn.finance price","token price feed","crypto price endpoint","x402 crypto API","micropayment price API","DeFi token price"],"warnings":["No OpenAPI or schema documentation available — response format is unknown","All doc/pricing/README pages return only a 'Connect wallet' prompt with no content","No example responses or field descriptions for the YFI price endpoint","The broader lowpaymentfee.com platform lists many endpoints but provides no technical docs for any of them"],"endpointUrl":"https://lowpaymentfee.com/api/v1/tokens/YFI/price","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/tokens/YFI/price","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no documented request/response schema, no example payloads, and all documentation pages are empty beyond a wallet-connect prompt. Effectively a stub 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'/docs':168 '/pricing':169 '/readme':172 '0.02':13,28,80,131 '000':126 '0x8335':111 '20':125 '2913':112 '6':135 'DeFi token price' 'YFI price API' 'accept':97 'access':145 'addit':183 'address':119 'advertis':144 'ai/ml':70 'amount':122 'analyt':69 'api':63,138 'application/json':158 'base':11,26,53,87,114,127 'beyond':160 'broader':60 'call':82 'challeng':90 'confirm':91 'connect':178 'contract':110 'cover':67 'crypto price endpoint' 'crypto-market-data' 'current':3,18,35 'data':68,73 'decim':136 'descript':197 'detail':185 'document':159 'empti':166 'endpoint':32,93,203 'equal':130 'essenti':165 'exact':106,217 'exact-schem':105 'exampl':192 'field':219 'finance/web3':72 'format':42 'get':1,16 'grant':147 'immedi':148 'infer':71 'json':41 'json-api' 'key':139 'land':162 'limit':142 'live':95 'lowpaymentfee.com':66 'made':102 'max':121 'micropay':9,24 'micropayment price API' 'mime':155 'network':54 'offer':64 'openapi':189 'page':163,173 'paid':43 'part':57 'path':204 'payload':194 'payment':100,152 'per':14,29,45,81 'per-request':44 'per-request-micropayment' 'post':98 'price':6,21,36,78,209 'prompt':180 'protocol':50 'provid':117 'quot':210 'rate':141 'render':175 'request':15,30,46,99 'request/response':193 'requir':123 'respons':154,200,218 'return':33,207 'schema':201 'scheme':107 'servic':76 'settl':83 'spec':190 'suggest':205 'suit':61 'technic':184 'token':5,20,214 'token price feed' 'token-price-lookup' 'transfer':109 'type':156 'unit':128 'unknown':221 'upon':149 'usd':132 'usdc':85,108,133 'usdc-base' 'use':134 'util':75 'valid':150 'via':7,22,47,103 'wallet':179 'x402':8,23,49,89,151 'x402 crypto API' 'x402-payment' 'yearn.finance':39 'yearn.finance price' 'yfi':4,19,38,213 'yfi-price'","prices":[{"id":"774b65ea-cdce-4287-a8d7-bfbbab4911ab","listingId":"1f8467b0-a174-42bb-837b-c9f4345f6314","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/tokens/YFI/price","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:23.116Z"}],"sources":[{"listingId":"1f8467b0-a174-42bb-837b-c9f4345f6314","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/tokens/YFI/price","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:23.116Z","lastSeenAt":"2026-04-23T19:01:40.396Z"}],"details":{"listingId":"1f8467b0-a174-42bb-837b-c9f4345f6314","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/tokens/YFI/price \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns HTTP 402 with x402 challenge, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/tokens/YFI/price"},{"claim":"Price is $0.02 per request (20000 base units USDC, 6 decimals)","source_url":"https://lowpaymentfee.com"},{"claim":"Payment settled in USDC on Base network to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/tokens/YFI/price"},{"claim":"No API keys, no rate limits, instant access advertised","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching the current YFI token price for portfolio tracking or trading bots","Integrating real-time YFI pricing into a DeFi dashboard without API key management","Agent-driven price lookups where per-call payment is preferred over subscriptions"],"bestFor":["AI agents or bots that need on-demand YFI price data with no signup","Developers wanting a simple pay-per-call crypto price feed on Base","Low-volume consumers who prefer micropayments over monthly subscriptions"],"notFor":["High-frequency trading requiring sub-second latency and bulk pricing","Users who need historical price data or OHLCV candles (not evidenced here)","Anyone without a Base-network USDC wallet for x402 payments"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.977Z"},"updatedAt":"2026-04-23T19:01:40.396Z"}}