{"id":"f95b0d24-779e-408b-9661-686cad72997c","shortId":"5ytTY7","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad set of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request using USDC on the Base network, settled via the x402 protocol. There are no API keys, no rate limits, and no subscription commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transfers/43` is listed as \"Premium API Access\" and requires a maximum of 20,000 base units of USDC (0.02 USDC, i.e., $0.02) per call. The platform advertises categories including Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints appear to share the same $0.02 per-request pricing.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The x402 challenge is live and well-formed, confirming the endpoint is operational, but without documentation it is unclear what request body this specific endpoint expects or what it returns.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","no-api-key"],"categories":["ai","finance","data","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","premium api access"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or schema definition for any endpoint","The specific function of /api/v1/transfers/43 ('Premium API Access') is not described anywhere","Request body format and response structure are completely unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/43","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/transfers/43","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 well-formed, confirming the endpoint works and pricing is clear ($0.02 USDC per call). However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. The specific purpose of /api/v1/transfers/43 is 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'/request':13,30 '0.02':12,29,122,125,173 '000':117 '20':116 'access':110 'advertis':130 'ai':140 'ai-inference' 'ai/ml':53 'analysi':144 'analyt':52,134 'api':5,15,22,32,41,81,109,184 'appear':168 'attach':92 'base':8,25,71,118 'base network api' 'bodi':237 'broad':46 'call':4,21,127 'caller':90 'categori':131 'challeng':217 'classif':147 'classification' 'commit':89 'confirm':224 'connect':193 'content':199 'convers':164 'crypto-quotes' 'data':51,56,133,137 'data-analytics' 'detail':210 'doc':183 'document':178,211,231 'embed':148 'embeddings' 'enabl':40 'endpoint':49,61,102,167,214,226,240 'estim':158 'exampl':207 'exchang':153 'expect':241 'export':138 'extrem':180 'feed':152 'financ':149 'finance-data' 'finance/web3':55 'form':223 'gas':157 'generat':165 'geocod':162 'geocoding' 'header':96 'i.e':124 'includ':132 'infer':54 'infrastructur':160 'insight':139 'key':16,33,82 'learn':142 'limit':85 'list':106 'live':219 'low payment fee' 'lowpaymentfee.com':35 'machin':141 'maximum':114 'metric':135 'micropayment api' 'network':9,26,72 'no-api-key' 'offer':44 'openapi':203 'oper':228 'page':188 'pay':2,19,64 'pay per call api' 'pay-per-cal':1,18 'pay-per-request':63 'payment':95 'per':3,20,65,126,175 'per-request':174 'platform':6,23,42,129 'premium':108 'premium api access' 'price':151,177,185 'prompt':195 'protocol':77 'quot':156 'rate':84,154 'readm':187 'render':190 'report':136 'request':66,99,176,236 'request/response':206 'requir':17,34,112 'return':245 'schema':204 'sentiment':143 'sentiment-analysis' 'servic':59 'set':47 'settl':73 'share':170 'simpli':91 'span':50 'spars':181 'specif':101,239 'subscript':88 'summar':146 'text':145 'text-summarization' 'token':155 'unclear':234 'unit':119 'usdc':68,121,123 'usdc api' 'usdc-base-network' 'use':67 'util':58,161 'valid':163 'via':10,27,74 'wallet':194 'web3':150 'well':222 'well-form':221 'without':230 'x402':11,28,39,76,94,216 'x402 api' 'x402-enabled':38 'x402-payment'","prices":[{"id":"d364d9b1-c10b-460d-9ca5-c78db551584d","listingId":"f95b0d24-779e-408b-9661-686cad72997c","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/transfers/43","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:43.397Z"}],"sources":[{"listingId":"f95b0d24-779e-408b-9661-686cad72997c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/43","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:43.397Z","lastSeenAt":"2026-04-22T08:31:50.558Z"}],"details":{"listingId":"f95b0d24-779e-408b-9661-686cad72997c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/43 \\\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":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/transfers/43 requires maxAmountRequired of 20000 base units of USDC (0.02 USD) on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/43"},{"claim":"Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without subscription","Fetching real-time financial data and crypto quotes on a per-request basis","Running utility operations like geocoding or data validation with micropayments","Integrating pay-as-you-go analytics and data export into agent workflows"],"bestFor":["Agents or developers who want zero-commitment, per-call API access","Use cases requiring no API key management or account signup","Crypto-native workflows already operating on the Base network"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integration","High-volume use cases where subscription pricing would be more economical","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.252Z"},"updatedAt":"2026-04-22T08:31:50.558Z"}}