{"id":"c4f38652-a8e9-4aa2-8320-e4c730687e48","shortId":"e6u3VU","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 set 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 subscriptions required. The specific endpoint at `/api/v1/transactions/17` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (0x8335…0913 on Base), which equals $0.02 given USDC's 6 decimals.\n\nThe platform advertises four categories of APIs: 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 (geocoding, validation, conversion, generation). All endpoints follow the same $0.02 flat pricing model.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/transactions/17` endpoint specifically returns. The x402 challenge confirms the endpoint is live and accepts POST requests, but the actual payload format and response structure are unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-price-feeds","exchange-rates","crypto-gas-estimates","geocoding","validation","conversion"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","serverless api","no-auth api"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content","No OpenAPI or JSON schema describing request/response formats for any endpoint","The specific endpoint /api/v1/transactions/17 ('Premium API Access') has no description of its purpose or expected input/output","Cannot verify that the advertised AI, finance, or utility endpoints actually function as described"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/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/transactions/17","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 there is no OpenAPI schema, no documentation beyond a landing page listing, no request/response examples, and no explanation of what the /api/v1/transactions/17 endpoint actually does. The docs pages are empty wallet-connect 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'/api/v1/transactions/17':84,202 '/docs':170 '/pricing':172 '/readme':174 '/request':13,28 '0.02':12,27,59,111,161 '000':100 '0913':106 '0x8335':105 '20':99 '6':115 'accept':215 'access':90 'actual':220 'advertis':119 'ai':131 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':49 'analysi':135 'analyt':48,125 'api':5,20,37,71,89,123 'base':8,23,67,101,108 'base network api' 'broad':42 'call':4,19 'categori':121 'challeng':95,208 'classif':138 'confirm':209 'connect':180 'convers':154 'conversion' 'cost':58 'crypto-gas-estimates' 'data':47,52,124,128 'data-analytics' 'decim':116 'descript':198 'detail':187 'document':165 'embed':139 'enabl':36 'endpoint':45,57,82,157,203,211 'equal':110 'estim':149 'everi':56 'exampl':195 'exchang':144 'exchange-rates' 'export':129 'extrem':167 'feed':143 'financ':140 'finance-price-feeds' 'finance/web3':51 'flat':162 'follow':158 'format':222 'four':120 'gas':148 'generat':155 'geocod':152 'geocoding' 'given':112 'infer':50 'infrastructur':151 'insight':130 'key':72 'learn':133 'limit':75 'list':86 'live':213 'low payment fee' 'lowpaymentfee.com':31 'machin':132 'metric':126 'micropayment api' 'model':164 'network':9,24,68 'no-auth api' 'offer':40 'openapi':191 'page':175 'paid':62 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payload':221 'per':3,18,60 'platform':6,21,38,118 'post':216 'premium':88 'price':142,163 'prompt':182 'quot':147 'rate':74,145 'render':177 'report':127 'request':61,96,217 'request/response':194 'requir':79 'respons':224 'return':92,205 'schema':192 'sentiment':134 'serverless api' 'servic':55 'set':43 'span':46 'spars':168 'specif':81,204 'structur':225 'subscript':78 'summar':137 'technic':186 'text':136 'token':146 'unit':102 'unknown':227 'usdc':15,30,64,104,113 'usdc api' 'usdc-base-network' 'util':54 'valid':153 'validation' 'via':10,25 'wallet':181 'web3':141 'x402':11,26,35,94,207 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"d9c65a8c-7eef-4d62-a7db-3d7b6495d58d","listingId":"c4f38652-a8e9-4aa2-8320-e4c730687e48","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/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":"2026-04-18T18:58:55.829Z"}],"sources":[{"listingId":"c4f38652-a8e9-4aa2-8320-e4c730687e48","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/17","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:55.829Z","lastSeenAt":"2026-04-22T13:31:46.520Z"}],"details":{"listingId":"c4f38652-a8e9-4aa2-8320-e4c730687e48","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/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 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/17 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/17"},{"claim":"Platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, exchange rates, and gas estimates on a per-call basis","Running data analytics queries and exporting data with micropayment-based access control","Using utility services like geocoding and validation without subscriptions"],"bestFor":["Agents or bots that need stateless, pay-per-call API access without credentials","Developers prototyping with multiple API categories at minimal cost","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where per-request pricing may add up quickly","Users who need detailed API documentation, schemas, or SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.739Z"},"updatedAt":"2026-04-22T13:31:46.520Z"}}