{"id":"92431731-cadd-49f1-87ea-85afe85162e7","shortId":"rGJsSE","kind":"x402","title":"Pay-per-call token data endpoint for YFI via x402 on Base, settled in USDC.","tagline":"Pay-per-call token data endpoint for YFI via x402 on Base, settled in USDC.","description":"This endpoint at lowpaymentfee.com provides token data for YFI (yearn.finance) as part of a broader suite of finance, crypto, AI, and utility APIs. It uses the x402 payment protocol on the Base network, accepting USDC payments at $0.02 per request. No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof to receive a JSON response.\n\nThe provider's site lists a wide range of endpoints across categories including data analytics, AI/ML inference, finance/Web3, and infrastructure utilities, all uniformly priced at $0.02 per call. The specific endpoint `/api/v1/tokens/YFI` falls under the crypto/finance category, though it is not explicitly listed on the landing page among the featured endpoints. The exact response schema is not documented; the x402 challenge confirms the endpoint is live, accepts POST requests, and returns application/json.\n\nDocumentation is extremely thin — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no example request/response, and no description of what fields the YFI token endpoint returns. Callers should expect typical token data (price, market cap, volume, etc.) but this is inferred, not confirmed.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","token-data","per-call-pricing","no-api-key","json-response"],"categories":["finance","crypto"],"synonyms":["YFI token price","yearn finance data","crypto token API","x402 crypto endpoint","pay-per-call token data","YFI market data","USDC micropayment API"],"warnings":["No API documentation available — docs, pricing, and API pages all show only 'Connect wallet'","No OpenAPI or response schema provided; response format is unknown","The /api/v1/tokens/YFI endpoint is not listed among the provider's featured endpoints on the landing page","Exact data returned for YFI token is inferred, not confirmed"],"endpointUrl":"https://lowpaymentfee.com/api/v1/tokens/YFI","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","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 confirmed) and pricing is clear ($0.02 per call in USDC on Base). However, there is no OpenAPI spec, no documented response schema, no example requests or responses, and the docs/pricing/API pages are empty beyond a wallet-connect prompt. The specific /tokens/YFI path is not even listed on the landing page. This is effectively a stub 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'0.02':70,125 'USDC micropayment API' 'YFI market data' 'YFI token price' 'accept':66,166 'across':110 'ai':52 'ai/ml':115 'among':147 'analyt':114 'api':55,74,180 'application/json':171 'attach':83 'base':13,29,64 'base-network' 'broader':47 'call':4,20,127 'caller':81,213 'cap':221 'categori':111,136 'challeng':160 'confirm':161,229 'connect':186 'crypto':51 'crypto token API' 'crypto/finance':135 'data':6,22,39,113,218 'descript':204 'detail':193 'doc':177 'document':157,172 'endpoint':7,23,34,109,130,150,163,211 'etc':223 'exact':152 'exampl':200 'expect':215 'explicit':141 'extrem':174 'fall':132 'featur':149 'field':207 'financ':50 'finance/web3':117 'header':88 'includ':112 'infer':116,227 'infrastructur':119 'json':98 'json-response' 'key':75 'land':145 'limit':78 'list':104,142 'live':165 'lowpaymentfee.com':36 'market':220 'network':65 'no-api-key' 'openapi':197 'page':146,181 'part':44 'pay':2,18 'pay-per-cal':1,17 'pay-per-call token data' 'payment':60,68,87,93 'per':3,19,71,126 'per-call-pricing' 'post':167 'price':123,178,219 'prompt':188 'proof':94 'protocol':61 'provid':37,101 'rang':107 'rate':77 'receiv':96 'render':183 'request':72,168 'request/response':201 'requir':80 'respons':99,153 'return':170,212 'schema':154 'settl':14,30 'simpli':82 'site':103 'spec':198 'specif':129 'suit':48 'technic':192 'thin':175 'though':137 'token':5,21,38,210,217 'token-data' 'typic':216 'uniform':122 'usdc':16,32,67 'usdc-settlement' 'use':57 'util':54,120 'valid':91 'via':10,26 'volum':222 'wallet':187 'wide':106 'x':86 'x-payment':85 'x402':11,27,59,92,159 'x402 crypto endpoint' 'x402-payment' 'yearn finance data' 'yearn.finance':42 'yfi':9,25,41,209","prices":[{"id":"c20d0425-3b6f-4306-b431-9dfeedc3fe6a","listingId":"92431731-cadd-49f1-87ea-85afe85162e7","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","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:25.576Z"}],"sources":[{"listingId":"92431731-cadd-49f1-87ea-85afe85162e7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/tokens/YFI","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:25.576Z","lastSeenAt":"2026-04-23T19:01:40.530Z"}],"details":{"listingId":"92431731-cadd-49f1-87ea-85afe85162e7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/tokens/YFI \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns HTTP 402 with x402 version 1 challenge, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/tokens/YFI"},{"claim":"Payment is in USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/tokens/YFI"},{"claim":"All APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/tokens/YFI"}],"useCases":["Fetching current YFI token data (price, market info) without managing API keys","Integrating real-time token information into trading bots or dashboards","Agent-driven crypto data retrieval with automatic per-call USDC micropayments"],"bestFor":["Developers or agents needing on-demand YFI token data with no subscription","x402-compatible agents that can settle USDC on Base","Low-volume or sporadic crypto data lookups where pay-per-call is economical"],"notFor":["High-frequency trading requiring sub-second latency guarantees (no SLA documented)","Users who need detailed API documentation or guaranteed response schemas before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.856Z"},"updatedAt":"2026-04-23T19:01:40.530Z"}}