{"id":"c6f0f4a5-b28a-465e-9b28-4bd00041f2d2","shortId":"jjGFPZ","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. All endpoints are paid per-request using USDC on the Base network at a flat rate of $0.02 per call, with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint at `/api/v1/transactions/293` is listed as \"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. Payment is made via the x402 exact scheme with a 300-second timeout. The platform advertises additional 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 (geocoding, validation, conversion, generation).\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 spec, no request/response schema documentation, and no usage examples available from the crawled material. The endpoint is confirmed live (402 challenge captured), but without documentation it is unclear what input this specific `/transactions/293` endpoint expects or what it returns.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","no-api-key","pay-per-use","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available — all /docs, /api, /pricing, /README pages return only 'Connect wallet' with no content","The specific purpose and expected input/output of /api/v1/transactions/293 ('Premium API Access') is undocumented","No request or response examples could be found in crawled material","Platform reliability, uptime, and data freshness are unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/293","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/293","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and no examples. The specific purpose of /api/v1/transactions/293 is undocumented. This is effectively a stub 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'/api/v1/transactions/293':92 '/docs':178 '/pricing':180 '/readme':182 '/request':13,28 '/transactions/293':231 '0.02':12,27,74,119 '000':108 '0x8335':113 '20':107 '2913':114 '300':130 '402':102,218 'access':98 'across':138 'addit':136 'advertis':135 'ai':148 'ai-inference' 'ai/ml':49 'analysi':152 'analyt':48,142 'api':5,20,37,79,97 'avail':208 'base':8,23,67,109,116 'base network api' 'broad':42 'call':4,19,76 'captur':220 'categori':140 'challeng':103,219 'classif':155 'classification' 'commit':86 'confirm':216 'connect':188 'content':194 'convers':171 'crawl':211 'data':47,52,141,145 'data-analytics' 'document':173,203,223 'embed':156 'embeddings' 'enabl':36 'endpoint':45,57,90,137,214,232 'equal':118 'estim':166 'exact':126 'exampl':207 'exchang':161 'expect':233 'export':146 'extrem':175 'feed':160 'financ':157 'finance-data' 'finance/web3':51 'flat':71 'four':139 'gas':165 'generat':172 'geocod':169 'geocoding' 'infer':50 'infrastructur':168 'input':228 'insight':147 'key':80 'learn':150 'limit':83 'list':94 'live':217 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':149 'made':122 'materi':212 'metric':143 'micropayment api' 'network':9,24,68 'no-api-key' 'offer':40 'openapi':198 'page':183 'paid':59 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-use' 'payment':120 'per':3,18,61,75 'per-request':60 'per-request-billing' 'platform':6,21,38,134 'premium':96 'price':159 'prompt':190 'quot':164 'rate':72,82,162 'render':185 'report':144 'request':62,104 'request/response':201 'requir':87 'return':100,237 'schema':202 'scheme':127 'second':131 'sentiment':151 'sentiment-analysis' 'servic':55 'set':43 'span':46 'spars':176 'spec':199 'specif':89,230 'summar':154 'text':153 'text-summarization' 'timeout':132 'token':163 'unclear':226 'unit':110 'usag':206 'usdc':15,30,64,112 'usdc api' 'usdc-base' 'use':63 'util':54 'valid':170 'via':10,25,123 'wallet':189 'web3':158 'without':222 'x402':11,26,35,125 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"a8b09711-e912-4d02-90ce-3c3206c25dd2","listingId":"c6f0f4a5-b28a-465e-9b28-4bd00041f2d2","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/293","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:25:49.563Z"}],"sources":[{"listingId":"c6f0f4a5-b28a-465e-9b28-4bd00041f2d2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/293","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:25:49.563Z","lastSeenAt":"2026-04-22T19:32:17.484Z"}],"details":{"listingId":"c6f0f4a5-b28a-465e-9b28-4bd00041f2d2","quickStartSnippet":"# The endpoint expects an x402 payment header (USDC on Base, $0.02 per call)\ncurl -X POST https://lowpaymentfee.com/api/v1/transactions/293 \\\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":"Flat pricing of $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"402 challenge requests maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/293"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis","Running utility operations like geocoding, validation, and data conversion with micropayments"],"bestFor":["Agents or developers wanting zero-setup, pay-as-you-go API access","x402-compatible clients that can settle USDC payments on Base","Low-volume or bursty workloads where subscription pricing is wasteful"],"notFor":["High-volume production workloads needing SLAs or guaranteed uptime documentation","Users who need detailed API documentation, request/response schemas, or integration guides before committing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.662Z"},"updatedAt":"2026-04-22T19:32:17.484Z"}}