{"id":"55dfcc51-4445-48bf-b55f-d18928d60355","shortId":"awN3Q8","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 collection 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 upfront commitments. The specific endpoint at `/api/v1/transactions/237` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02, since USDC uses 6 decimals) on Base.\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 utilities (geocoding, validation, conversion, generation). All endpoints follow the same $0.02 per-request pricing model.\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 schema, no request/response examples, and no detailed documentation for any endpoint. The x402 challenge is live and well-formed, confirming the endpoint accepts POST requests and settles payments via USDC on Base to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-prices","exchange-rates","crypto-gas-estimates","geocoding","validation","conversion"],"categories":["ai","finance","data","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No OpenAPI schema or detailed API documentation available — all doc pages show only 'Connect wallet'","The specific functionality of /api/v1/transactions/237 ('Premium API Access') is unclear; it does not match any of the advertised endpoint paths","No request or response examples are available for any endpoint","The breadth of advertised capabilities (AI, finance, analytics, utilities) is unverifiable without documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/237","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/237","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 well-formed, confirming the endpoint works and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages render only 'Connect wallet' with no useful content. The specific purpose of the /api/v1/transactions/237 endpoint beyond 'Premium API Access' is 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'infrastructur':148 'insight':127 'key':72 'learn':130 'limit':75 'list':86 'live':206 'low payment fee' 'lowpaymentfee.com':31 'machin':129 'metric':123 'micropayment api' 'model':164 'network':9,24,68 'offer':40 'openapi':190 'page':175 'paid':62 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':219 'per':3,18,60,161 'per-request':160 'platform':6,21,38,115 'post':215 'premium':88 'price':139,163,172 'prompt':182 'quot':144 'rate':74,142 'readm':174 'render':177 'report':124 'request':61,96,162,216 'request/response':193 'return':92 'schema':191 'sentiment':131 'servic':55 'settl':218 'sinc':107 'span':46 'spars':168 'specif':81 'summar':134 'text':133 'token':143 'unit':102 'upfront':78 'usdc':15,30,64,104,108,221 'usdc api' 'usdc-base' 'use':109 'util':54,149 'valid':151 'validation' 'via':10,25,220 'wallet':181 'web3':138 'well':209 'well-form':208 'x402':11,26,35,94,203 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"0ef3b977-436c-429d-b59b-8e48a86ebb4c","listingId":"55dfcc51-4445-48bf-b55f-d18928d60355","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/237","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:33.622Z"}],"sources":[{"listingId":"55dfcc51-4445-48bf-b55f-d18928d60355","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/237","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:33.622Z","lastSeenAt":"2026-04-22T12:04:36.233Z"}],"details":{"listingId":"55dfcc51-4445-48bf-b55f-d18928d60355","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/237 \\\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 requests maxAmountRequired of 20000 base units of USDC (USD Coin) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/237"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages all render only 'Connect wallet' with no further content","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 per-request USDC micropayments","Using utility services like geocoding and validation without subscriptions"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments in USDC on Base","Projects needing diverse API capabilities without managing API keys or rate limits"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:40.925Z"},"updatedAt":"2026-04-22T12:04:36.233Z"}}