{"id":"c03ac2b3-64a0-44a1-a524-b1c070df062a","shortId":"HwZAhX","kind":"x402","title":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API marketplace that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. The x402 protocol means there are no API keys, no sign-ups, and no rate limits — callers simply attach a payment header to each request.\n\nThe specific endpoint at `/api/v1/payments/395` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge confirms it is live, requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\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 — all at the same $0.02 price point. However, documentation beyond the landing page is essentially empty (all sub-pages only show \"Connect wallet\"), so the actual behavior, input schemas, and response formats for this specific endpoint and others are undocumented.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["api-marketplace","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","base usdc api","micropayment api","402 payment api","lowpaymentfee"],"warnings":["No documentation available — all sub-pages (docs, api, pricing, README) return only 'Connect wallet' with no content.","The purpose and behavior of /api/v1/payments/395 is completely undocumented; 'Premium API Access' is a generic label.","No input or output schema is provided beyond the x402 outputSchema stub indicating POST method.","Cannot verify what data or service this endpoint actually provides."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/395","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/395","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is zero documentation on what this specific endpoint does, what inputs it accepts, or what it returns. All doc/pricing/API pages are blank beyond a 'Connect wallet' prompt. The listing title 'Premium API Access' is generic and 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'/request':12,28 '0.02':11,27,61,134,181 '000':123 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':145 '0x8335':128 '20':122 '2913':129 '300':148 '402 payment api' '6':138 'accept':109 'access':107 'across':47 'actual':203 'address':144 'advertis':154 'ai/ml':50 'analysi':158 'analyt':49 'api':5,14,21,30,39,78,106 'attach':90 'base':8,24,69,124,131 'base usdc api' 'behavior':204 'beyond':186 'broader':152 'call':4,20 'caller':88 'challeng':114 'classif':161 'confirm':115 'connect':199 'convers':173 'data':48,175 'decim':139 'document':185 'embed':162 'empti':192 'enabl':38 'endpoint':46,57,99,155,213 'equal':133 'essenti':191 'estim':170 'everi':56 'exchang':165 'feed':164 'finance/web3':52 'format':209 'gas':169 'generat':176 'geocod':171 'given':135 'header':93 'howev':184 'infer':51 'infrastructur':54 'input':205 'json-response' 'key':15,31,79 'land':188 'limit':87 'list':103 'live':118 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':33 'made':142 'marketplac':40 'mean':74 'micropayment api' 'network':70 'no-api-key' 'offer':42 'other':215 'page':189,196 'pay':2,18 'pay per call api' 'pay-per-cal':1,17 'pay-per-request' 'payment':92,140 'per':3,19,62 'platform':6,22,153 'point':183 'post':110 'post-endpoint' 'premium':105 'price':59,163,182 'protocol':73 'quot':168 'rate':86,166 'request':63,96,111,119 'requir':16,32 'respons':208 'schema':206 'second':149 'sentiment':157 'settl':64 'show':198 'sign':82 'sign-up':81 'simpli':89 'specif':98,212 'sub':195 'sub-pag':194 'summar':160 'text':159 'timeout':150 'token':167 'undocu':217 'unit':125 'up':83 'usdc':66,127,136 'usdc-base' 'util':55 'valid':172 'varieti':44 'via':9,25 'wallet':200 'x402':10,26,37,72,113 'x402 api' 'x402-enabled':36 'x402-payment'","prices":[{"id":"bea7b56a-d19d-4566-8079-4fca81bee464","listingId":"c03ac2b3-64a0-44a1-a524-b1c070df062a","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/395","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:44.064Z"}],"sources":[{"listingId":"c03ac2b3-64a0-44a1-a524-b1c070df062a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/395","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:44.064Z","lastSeenAt":"2026-04-22T21:31:10.248Z"}],"details":{"listingId":"c03ac2b3-64a0-44a1-a524-b1c070df062a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/395 \\\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":"Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/395"},{"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":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-call USDC micropayments on Base","Agent-driven workflows that need keyless, on-demand API access","Testing x402 payment protocol integrations"],"bestFor":["Developers experimenting with x402 pay-per-call protocols","AI agents that need frictionless, keyless API access","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation and input/output schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.176Z"},"updatedAt":"2026-04-22T21:31:10.248Z"}}