{"id":"66db82b3-cef3-4c15-b8e0-88e0255dd61e","shortId":"De9XU5","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 broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no upfront commitments. The specific endpoint at `/api/v1/transactions/186` is listed as \"Premium API Access\" and returns `application/json` via POST.\n\nThe platform advertises four endpoint categories: 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 follow the x402 payment protocol — callers send an `X-PAYMENT` header containing a signed USDC payment on Base, and the server fulfills the request once payment is verified.\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 description of what the `/api/v1/transactions/186` endpoint specifically returns. The x402 challenge confirms the endpoint is live and accepts up to 20,000 base units of USDC (i.e., $0.02) per call.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-api","no-api-key","data-analytics","ai-inference","finance-data","web3-data","utility-services"],"categories":["api-platform","finance","llm","geo"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto-paid API"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no usable content.","No OpenAPI or JSON schema available — request and response formats are unknown.","The specific purpose of /api/v1/transactions/186 ('Premium API Access') is not described anywhere; it is unclear what data it returns.","The platform lists many endpoint categories but none have documented schemas or examples."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/186","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/186","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 payment details, but documentation is effectively nonexistent — every doc page shows only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no description of what the specific /api/v1/transactions/186 endpoint returns. The listing is largely a 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'/request':13,28 '0.02':12,27,59,226 '000':220 '20':219 'Base network API' 'USDC micropayment API' 'accept':216 'access':90 'advertis':98 'ai':109 'ai-inference' 'ai/ml':49 'analysi':113 'analyt':48,103 'api':5,20,37,71,89,172 'application/json':93 'base':8,23,67,155,221 'broad':42 'call':4,19,228 'caller':142 'catalog':43 'categori':101 'challeng':209 'classif':116 'commit':79 'confirm':210 'connect':181 'contain':149 'content':187 'convers':133 'cost':58 'crypto-paid API' 'data':47,52,102,106 'data-analytics' 'descript':199 'detail':198 'doc':171 'document':166 'embed':117 'enabl':36 'endpoint':45,57,82,100,136,204,212 'estim':127 'everi':56 'exampl':195 'exchang':122 'export':107 'extrem':168 'feed':121 'financ':118 'finance-data' 'finance/web3':51 'follow':137 'four':99 'fulfil':159 'gas':126 'generat':134 'geocod':131 'header':148 'i.e':225 'infer':50 'infrastructur':129 'insight':108 'json-api' 'key':72 'learn':111 'limit':75 'list':86 'live':214 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':110 'metric':104 'network':9,24,68 'no-api-key' 'offer':40 'openapi':191 'page':176 'paid':62 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':140,147,153,163 'per':3,18,60,227 'platform':6,21,38,97 'post':95 'premium':88 'price':120,173 'prompt':183 'protocol':141 'quot':125 'rate':74,123 'readm':175 'render':178 'report':105 'request':61,161 'request/response':194 'return':92,206 'schema':192 'send':143 'sentiment':112 'server':158 'servic':55 'sign':151 'span':46 'spars':169 'specif':81,205 'summar':115 'text':114 'token':124 'unit':222 'upfront':78 'usdc':15,30,64,152,224 'usdc-base-network' 'util':54,130 'utility-services' 'valid':132 'verifi':165 'via':10,25,94 'wallet':182 'web3':119 'web3-data' 'x':146 'x-payment':145 'x402':11,26,35,139,208 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"f690fcdc-5f71-4ff4-865e-97522ad8b3b5","listingId":"66db82b3-cef3-4c15-b8e0-88e0255dd61e","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/186","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:02.431Z"}],"sources":[{"listingId":"66db82b3-cef3-4c15-b8e0-88e0255dd61e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/186","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:02.431Z","lastSeenAt":"2026-04-22T21:31:37.322Z"}],"details":{"listingId":"66db82b3-cef3-4c15-b8e0-88e0255dd61e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/186 \\\n  -H \"X-PAYMENT: <x402-signed-payment-header>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints cost $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/transactions/186 specifies maxAmountRequired of 20000 base units of USDC (USD Coin) on Base.","source_url":"https://lowpaymentfee.com/api/v1/transactions/186"},{"claim":"Endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation, API, pricing, and README pages render only a 'Connect wallet' prompt.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing analytics metrics and reports on a per-call basis without subscription","Running AI inference tasks (sentiment, summarization, classification, embeddings) with per-request USDC payments","Fetching real-time crypto prices, gas estimates, and exchange rates","Geocoding, data validation, and format conversion via utility endpoints"],"bestFor":["Developers who want API access without API keys or rate limits","Agents and bots that can settle x402 micropayments in USDC on Base","Projects needing low-cost, pay-as-you-go access to diverse API categories"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","Applications requiring high-throughput bulk access with negotiated pricing","Developers without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.376Z"},"updatedAt":"2026-04-22T21:31:37.322Z"}}