{"id":"a2c27aab-6216-4a78-916f-c42ac1f6d676","shortId":"XhZXSX","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/17` is labeled \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and returns application/json. Payment is settled on-chain 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, /README) returned only a \"Connect wallet\" prompt with no substantive content, so the actual behavior and response schemas of these endpoints remain undocumented.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","post-method","no-api-key","customer-data"],"categories":["data","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["Documentation pages (/docs, /pricing, /README) contain no useful content — only a 'Connect wallet' prompt","No request body schema or response schema is documented for this endpoint","The specific purpose of /api/v1/customers/17 is unclear — 'Premium API Access' is a generic label","No OpenAPI specification available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/17","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/17","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, there is no OpenAPI schema, no documented request/response format, no examples, and all documentation pages are empty stubs showing only 'Connect wallet'. The purpose of the /api/v1/customers/17 endpoint specifically is unclear beyond the generic 'Premium API Access' 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'/docs':176 '/pricing':177 '/readme':178 '/request':13,28 '0.02':12,27,62,113,170 '000':102 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':135 '0x8335':107 '20':101 '2913':108 '300':138 '402':96 '6':117 'Base network API' 'USDC micropayment API' 'accept':121 'access':92 'across':45 'actual':191 'address':134 'advertis':144 'ai':48 'analysi':148 'analyt':47 'api':5,20,37,74,91 'application/json':126 'base':8,23,70,103,110 'behavior':192 'broader':142 'call':4,19 'categori':56 'chain':132 'challeng':97 'classif':151 'commit':81 'connect':182 'content':188 'convers':163 'crypto-paid API' 'customer-data' 'data':46 'decim':118 'document':174 'embed':152 'enabl':36 'endpoint':44,58,85,120,145,198 'equal':112 'estim':160 'exchang':155 'feed':154 'financ':51 'gas':159 'generat':165 'geocod':161 'given':114 'howev':173 'infrastructur':54 'json-response' 'key':75 'label':89 'learn':50 'limit':78 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':49 'network':9,24,71 'no-api-key' 'offer':40 'on-chain':130 'page':175 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payabl':65 'payment':127 'per':3,18,63 'platform':6,21,38,143 'point':172 'post':122 'post-method' 'premium':90 'premium API access' 'price':60,153,171 'prompt':184 'quot':158 'rate':77,156 'remain':199 'request':64,98,123 'requir':82 'respons':194 'return':94,125,179 'schema':195 'second':139 'sentiment':147 'settl':129 'specif':84 'substant':187 'summar':150 'text':149 'timeout':140 'token':157 'undocu':200 'unit':104 'usdc':15,30,67,106,115 'usdc-base' 'util':55 'valid':162 'varieti':42 'via':10,25 'wallet':183 'web3':52 'x402':11,26,35 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"8e268d18-111c-42a0-8ea9-738eded120b5","listingId":"a2c27aab-6216-4a78-916f-c42ac1f6d676","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/17","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:05.291Z"}],"sources":[{"listingId":"a2c27aab-6216-4a78-916f-c42ac1f6d676","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/17","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:05.291Z","lastSeenAt":"2026-04-28T18:33:39.757Z"}],"details":{"listingId":"a2c27aab-6216-4a78-916f-c42ac1f6d676","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/17 \\\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, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/customers/17"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing customer data records via a single paid API call","Agent-driven workflows that need on-demand data without pre-registration","Programmatic access to premium content gated behind x402 micropayments"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents with USDC on Base that need to purchase data per-call","Prototyping integrations without API key management"],"notFor":["High-volume batch processing where $0.02/request adds up quickly","Users who need detailed API documentation and response schemas before integrating","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.941Z"},"updatedAt":"2026-04-28T18:33:39.757Z"}}