{"id":"28e6432f-a33b-4a0c-bd34-cdcea85de929","shortId":"Qbybje","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 & machine learning, finance & Web3, and infrastructure utility categories. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint at `/api/v1/customers/97` is labeled \"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 via the x402 exact scheme, settling 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 generation — all at the same $0.02 price point. However, documentation pages (/docs, /pricing, /api, /README) returned only a \"Connect wallet\" prompt with no substantive content, so the actual functionality, request/response schemas, and data sources behind these endpoints remain undocumented and unverifiable.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["api-platform","data"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README all returned only 'Connect wallet'","The specific endpoint /api/v1/customers/97 has no description beyond 'Premium API Access'; its actual functionality is unknown","No request or response schema is documented; callers cannot know what to send or expect back","The endpoint path suggests customer data, which could involve PII — exercise caution"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/97","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/customers/97","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of the /customers/97 endpoint is entirely opaque. All doc pages returned only 'Connect wallet' with no 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'/api/v1/customers/97':87 '/docs':177 '/pricing':178 '/readme':180 '/request':13,28 '0.02':12,27,62,119,171 '000':108 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':136 '0x8335':113 '20':107 '2913':114 '300':139 '402 payment api' '6':123 'accept':94 'access':92 'across':45 'actual':193 'address':135 'advertis':145 'ai':48 'analysi':149 'analyt':47 'api':5,20,37,74,91 'base':8,23,70,109,116 'base network api' 'behind':200 'broader':143 'call':4,19 'categori':56 'challeng':99 'classif':152 'commit':81 'confirm':100 'connect':184 'content':190 'convers':164 'data':46,198 'decim':124 'document':175 'embed':153 'enabl':36 'endpoint':44,58,85,146,202 'equal':118 'estim':161 'exact':131 'exchang':156 'feed':155 'financ':51 'function':194 'gas':160 'generat':166 'geocod':162 'given':120 'howev':174 'infrastructur':54 'json-response' 'key':75 'label':89 'learn':50 'limit':78 'live':103 'low payment fee' 'lowpaymentfee.com':31 'machin':49 'made':127 'micropayment api' 'network':9,24,71 'no-api-key' 'offer':40 'page':176 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payabl':65 'payment':125 'per':3,18,63 'platform':6,21,38,144 'point':173 'post':95 'post-endpoint' 'premium':90 'price':60,154,172 'prompt':186 'quot':159 'rate':77,157 'remain':203 'request':64,96,104 'request/response':195 'requir':82 'return':181 'schema':196 'scheme':132 'second':140 'sentiment':148 'settl':133 'sourc':199 'specif':84 'substant':189 'summar':151 'text':150 'timeout':141 'token':158 'undocu':204 'unit':110 'unverifi':206 'usdc':15,30,67,112,121 'usdc api' 'usdc-base-network' 'util':55 'valid':163 'varieti':42 'via':10,25,128 'wallet':185 'web3':52 'x402':11,26,35,98,130 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"a30cd091-5a24-4594-90e6-4c5af06dd4b4","listingId":"28e6432f-a33b-4a0c-bd34-cdcea85de929","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/customers/97","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:11.925Z"}],"sources":[{"listingId":"28e6432f-a33b-4a0c-bd34-cdcea85de929","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/97","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:11.925Z","lastSeenAt":"2026-04-25T00:03:32.678Z"}],"details":{"listingId":"28e6432f-a33b-4a0c-bd34-cdcea85de929","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/97 \\\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 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","source_url":"https://lowpaymentfee.com/api/v1/customers/97"},{"claim":"Platform offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or customer records via a single paid POST request","Agent-driven workflows that need low-friction, keyless API access settled in USDC","Testing x402 payment flows on Base network"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, per-call API access on Base","Low-volume consumers who prefer pay-as-you-go pricing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume production workloads requiring predictable bulk pricing","Developers who cannot pay in USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.618Z"},"updatedAt":"2026-04-25T00:03:32.678Z"}}