{"id":"77d3d8fa-510d-4943-bf65-77165c36bffe","shortId":"YYCcbk","kind":"x402","title":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request 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, paid in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/charges/387` is labeled \"Premium API Access\" and returns a valid x402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. Payment is made via the x402 exact scheme with no API keys or rate limits required. The platform advertises instant access with no minimums or commitments.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The actual behavior of the endpoint behind the paywall is unknown; the listing title \"Premium API Access\" does not clarify what data or functionality is returned upon successful payment.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","no-api-key"],"categories":["api-platform","llm","finance","geo"],"synonyms":["x402 API","pay-per-call API","micropayment API","USDC API","Base network API","lowpaymentfee","crypto-paid API","serverless API"],"warnings":["No OpenAPI or schema documentation available — all doc pages render only 'Connect wallet'","The specific endpoint /api/v1/charges/387 is labeled 'Premium API Access' with no description of what it actually returns","No request body schema or response schema is documented anywhere in the crawled material","Cannot verify what data or service is delivered after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/387","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/charges/387","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 pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and no examples. The actual functionality behind 'Premium API Access' at /api/v1/charges/387 is undefined. This is effectively a stub 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'made':145 'materi':209 'metric':63 'micropayment API' 'minimum':166 'network':108 'no-api-key' 'offer':48 'openapi':195 'page':179 'paid':102 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':143,238 'paywal':218 'per':3,22,55,100 'platform':6,25,46,160 'premium':116,224 'price':79,97,176 'prompt':186 'quot':84 'rate':82,156 'readm':178 'render':181 'report':64 'request':56,101,125 'request/response':198 'requir':158 'return':120,235 'schema':199 'scheme':150 'sentiment':71 'sentiment-analysis' 'serverless API' 'sinc':136 'spars':172 'spec':196 'specif':110 'success':237 'summar':74 'technic':190 'text':73 'text-summarization' 'titl':223 'token':83 'unit':131 'unknown':220 'upon':236 'usag':203 'usd':135 'usdc':104,133,137 'usdc-base' 'use':138 'util':15,34,89 'valid':91,122 'via':9,28,146 'wallet':185 'web3':78 'x402':10,29,43,123,148 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"cac4aae4-862a-4a0e-89e4-bb5f2b0dff48","listingId":"77d3d8fa-510d-4943-bf65-77165c36bffe","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/charges/387","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:25.943Z"}],"sources":[{"listingId":"77d3d8fa-510d-4943-bf65-77165c36bffe","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/387","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:25.943Z","lastSeenAt":"2026-04-23T06:31:02.596Z"}],"details":{"listingId":"77d3d8fa-510d-4943-bf65-77165c36bffe","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/387 \\\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 are 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":"The x402 challenge requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/387"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","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 data analytics queries and exporting data with per-request billing","Using utility services like geocoding, validation, and conversion without subscriptions"],"bestFor":["Agents or developers who want zero-signup, pay-as-you-go API access","Use cases requiring low-cost micropayments per API call on Base/USDC","Projects that need diverse API capabilities (AI, finance, data, utilities) from a single provider"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads where per-request pricing may not be cost-effective","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.581Z"},"updatedAt":"2026-04-23T06:31:02.596Z"}}