{"id":"9027688e-94b8-4c11-bd65-02d1ee3977a3","shortId":"qNXHgs","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/payments/27` is labeled \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\n\nThe broader platform offers endpoints across four 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 are listed at the same $0.02/request price point.\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/payments/27` endpoint specifically returns. The x402 challenge confirms the endpoint is live and accepts POST requests, but the actual functionality behind this particular path is unclear from available materials.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-method","json-response"],"categories":["api-platform","payments"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No documentation available — all doc/pricing/API/README pages render only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific purpose of /api/v1/payments/27 ('Premium API Access') is not explained anywhere","No request or response examples available to verify actual functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/27","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/payments/27","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge confirms the endpoint is live and pricing is clear ($0.02 USDC on Base). However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and the specific functionality of /api/v1/payments/27 is not described anywhere. This is effectively a stub 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'/request':13,30,151 '0.02':12,29,77,150 '000':71 '20':70 '402 payment api' 'accept':50,204 'access':65,91 'across':107 'actual':209 'advertis':82 'ai':117 'analysi':121 'analyt':111 'api':5,15,22,32,42,64,84,160 'attach':94 'avail':218 'base':8,25,55,72 'base network api' 'behind':211 'broader':103 'call':4,21,79 'categori':109 'challeng':197 'charg':67 'classif':124 'confirm':198 'connect':169 'content':175 'convers':141 'data':110,114 'descript':187 'detail':186 'doc':159 'document':154 'embed':125 'endpoint':59,106,144,192,200 'estim':135 'exampl':183 'exchang':130 'export':115 'extrem':156 'feed':129 'financ':126 'four':108 'function':210 'gas':134 'generat':142 'geocod':139 'header':98 'i.e':76 'infrastructur':137 'insight':116 'instant':90 'json-response' 'key':16,33,85 'label':62 'learn':119 'limit':88 'list':146 'live':202 'low payment fee' 'lowpaymentfee.com':35 'machin':118 'materi':219 'metric':112 'micropayment api' 'network':56 'no-api-key' 'offer':105 'openapi':179 'page':164 'particular':213 'path':214 'pay':2,19,39 'pay per call api' 'pay-per-cal':1,18 'pay-per-request':38 'payment':52,97 'per':3,20,40,78 'platform':6,23,43,81,104 'point':153 'post':205 'post-method' 'premium':63 'price':128,152,161 'prompt':171 'protocol':48 'quot':133 'rate':87,131 'readm':163 'render':166 'report':113 'request':41,101,206 'request/response':182 'requir':17,34 'return':194 'schema':180 'sentiment':120 'simpli':93 'spars':157 'specif':58,193 'summar':123 'text':122 'token':132 'unclear':216 'unit':73 'usdc':9,26,51,75 'usdc api' 'usdc-base-network' 'use':45 'util':138 'valid':140 'via':10,27 'wallet':170 'web3':127 'x402':11,28,47,96,196 'x402 api' 'x402-payment'","prices":[{"id":"037f1c5a-612f-4093-ac9f-8027a5fdbaef","listingId":"9027688e-94b8-4c11-bd65-02d1ee3977a3","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/payments/27","description":"Premium API 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<x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge accepting USDC on Base network, maxAmountRequired 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/payments/27"},{"claim":"Platform lists endpoints at $0.02/request across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Platform advertises no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/27"}],"useCases":["Agents that need on-demand API access without pre-registration or API key management","Programmatic access to data, AI, finance, or utility endpoints with per-call USDC micropayments","Testing x402 protocol integrations with a low-cost live endpoint"],"bestFor":["Developers exploring x402 payment protocol integrations","AI agents needing keyless, pay-as-you-go API access","Low-volume consumers who want no subscription commitments"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.879Z"},"updatedAt":"2026-04-24T02:02:30.240Z"}}