{"id":"9ca0fdfa-c3ee-4566-9cd8-b0edb2464e4a","shortId":"9NSBST","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad set of 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 utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, settled in USDC on the Base network via the x402 payment protocol.\n\nThe specific endpoint at `/api/v2/users` is listed as \"Premium API Access.\" Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the `exact` scheme with a 300-second timeout. No API keys or rate limits are required — callers simply attach an X-PAYMENT header to each request.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v2/users` endpoint actually returns. The platform's landing page confirms the pricing model and lists available endpoints, but provides no technical detail about request formats or response structures.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","sentiment-analysis","text-summarization","text-classification","embeddings","price-feeds","exchange-rates","gas-estimates","geocoding","data-export","analytics"],"categories":["llm","finance","geo","data"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","low payment fee"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","The /api/v2/users endpoint has no description of what it does, what input it expects, or what it returns.","No OpenAPI schema or request/response examples are provided anywhere.","The broader platform lists many endpoints but none have documented schemas or usage guides."],"endpointUrl":"https://lowpaymentfee.com/api/v2/users","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/v2/users","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and no documentation beyond a landing page listing. The purpose of the /api/v2/users endpoint specifically is undocumented. Effectively a stub 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'machin':65 'made':147 'maxamountrequir':126 'metric':59 'micropayment API' 'model':224 'network':104 'offer':10,29 'openapi':201 'page':186,220 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request' 'payment':108,145,171 'per':3,22,96 'platform':6,25,46,217 'premium':118 'price':75,93,183,223 'price-feeds' 'prompt':193 'protocol':109 'provid':48,230 'quot':80 'rate':78,161 'readm':185 'render':188 'report':60 'request':97,175,235 'request/response':204 'requir':164 'respons':238 'return':215 'schema':202 'scheme':151 'second':155 'sentiment':67 'sentiment-analysis' 'set':51 'settl':98 'simpli':166 'spars':179 'specif':111 'structur':239 'summar':70 'technic':232 'text':69 'text-classification' 'text-summarization' 'timeout':156 'token':79 'unit':131 'usdc':9,28,100,133,141 'usdc-base' 'util':15,34,85 'valid':87 'via':105,148 'wallet':192 'web3':74 'x':170 'x-payment':169 'x402':43,107,122 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"e5cf1c79-8271-4978-94df-48dc2fc96e72","listingId":"9ca0fdfa-c3ee-4566-9cd8-b0edb2464e4a","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/v2/users","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:33:47.194Z"}],"sources":[{"listingId":"9ca0fdfa-c3ee-4566-9cd8-b0edb2464e4a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v2/users","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:33:47.194Z","lastSeenAt":"2026-04-23T20:01:28.248Z"}],"details":{"listingId":"9ca0fdfa-c3ee-4566-9cd8-b0edb2464e4a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v2/users \\\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 (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v2/users"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification) without API key management","Fetching real-time crypto gas estimates or token price quotes via micropayment","Geocoding or data validation as a utility service paid per call","Exporting analytics data or generating insights on a pay-as-you-go basis"],"bestFor":["AI agents that need keyless, pay-per-call access to diverse utility endpoints","Developers prototyping with low-cost, no-commitment API access on Base","Web3-native applications that already hold USDC on Base"],"notFor":["High-volume production workloads where $0.02/request adds up quickly without bulk discounts","Users who need detailed API documentation, schemas, or SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T18:33:09.675Z"},"updatedAt":"2026-04-23T20:01:28.248Z"}}