{"id":"c28e8e91-da55-4bf3-b3d6-db9bf7da763d","shortId":"S37Tux","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transactions/86` is listed as \"Premium API Access\" and advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The x402 challenge confirms the endpoint is live, accepts POST requests, and returns application/json. The payment timeout is 300 seconds.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation. However, documentation pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no substantive content, so the actual behavior and response schemas of these endpoints remain undocumented. Without request/response examples or OpenAPI specs, callers will need to experiment to discover input formats and output structures.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-platform","finance","llm","geo"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available — all doc/pricing/README pages returned only 'Connect wallet'","The specific function of /api/v1/transactions/86 ('Premium API Access') is not explained anywhere","No request body schema or response schema is documented; callers must discover input/output formats experimentally","The platform lists many endpoint categories but none have documented behavior"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/86","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/transactions/86","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 confirms pricing and network details, but there is no OpenAPI spec, no documentation content (all doc pages return only 'Connect wallet'), no request/response examples, and the specific purpose of the /transactions/86 endpoint is unclear. This is effectively a stub 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'/request':13,28 '0.02':12,27,62,119 '000':108 '0x8335':113 '20':107 '2913':114 '300':143 '6':123 'Base network API' 'USDC micropayment API' 'accept':133 'access':100 'account':74 'across':45 'actual':189 'advertis':102,148 'ai-inference' 'ai/ml':48 'amount':105 'analysi':152 'analyt':47 'api':5,20,37,72,99 'application/json':138 'attach':82 'base':8,23,69,109,116 'behavior':190 'broader':146 'call':4,19 'caller':80,205 'challeng':127 'classif':155 'confirm':128 'connect':180 'content':186 'convers':167 'crypto-paid API' 'data':46,169 'data-analytics' 'decim':124 'discov':211 'doc':174 'document':172 'embed':156 'enabl':36 'endpoint':44,55,92,130,149,196 'equal':118 'estim':164 'exampl':201 'exchang':159 'experi':209 'feed':158 'finance-data' 'finance/web3':50 'format':213 'gas':163 'generat':170 'geocod':165 'given':120 'header':86 'howev':171 'infer':49 'infrastructur':52 'input':212 'json-response' 'key':73 'limit':77 'list':96 'live':132 'lowpaymentfee' 'lowpaymentfee.com':31 'max':104 'need':207 'network':9,24,70 'no-api-key' 'offer':40 'openapi':203 'output':215 'page':173 'pay':2,17,58 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':57 'payment':85,140 'per':3,18,59 'platform':6,21,38,147 'post':134 'post-method' 'premium':98 'premium API access' 'price':157,175 'prompt':182 'quot':162 'rate':76,160 'readm':176 'remain':197 'request':60,89,135 'request/response':200 'requir':79 'respons':192 'return':137,177 'schema':193 'second':144 'sentiment':151 'settl':64 'simpli':81 'spec':204 'specif':91 'structur':216 'substant':185 'summar':154 'text':153 'timeout':141 'token':161 'undocu':198 'unit':110 'usdc':15,30,66,112,121 'usdc-base-network' 'util':53 'utility-services' 'valid':166 'varieti':42 'via':10,25 'wallet':181 'without':199 'x402':11,26,35,84,126 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"750220b9-b5fb-467f-83e2-168a826176c7","listingId":"c28e8e91-da55-4bf3-b3d6-db9bf7da763d","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/transactions/86","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:07.039Z"}],"sources":[{"listingId":"c28e8e91-da55-4bf3-b3d6-db9bf7da763d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/86","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:07.039Z","lastSeenAt":"2026-04-22T16:32:15.150Z"}],"details":{"listingId":"c28e8e91-da55-4bf3-b3d6-db9bf7da763d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/86 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints 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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/transactions/86"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without signup","Fetching real-time crypto quotes, gas estimates, and exchange rates on a per-call basis","Geocoding, data validation, and format conversion via pay-per-request utility endpoints","Exporting analytics data and insights without subscription commitments"],"bestFor":["Agents and bots that need instant, keyless API access with crypto micropayments","Developers prototyping integrations who want zero-commitment pay-as-you-go pricing","Web3-native applications that can settle payments in USDC on Base"],"notFor":["Users who need detailed API documentation and guaranteed response schemas before integrating","High-volume production workloads where per-request pricing at $0.02 may not be cost-effective"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.981Z"},"updatedAt":"2026-04-22T16:32:15.150Z"}}