{"id":"5722efc1-f684-4a5f-907f-b5150b5a7f58","shortId":"5NyK9X","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 exposes a broad catalog of endpoints across four categories: Data & Analytics (metrics, reports, 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 protocol.\n\nThe specific endpoint `/api/v1/inbox/34` is listed as \"Premium API Access\" and returns a valid 402 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 minimal — the landing page lists available endpoints and pricing but provides no request/response schemas, parameter descriptions, or usage examples. The `/api`, `/pricing`, and `/README` pages all resolve to a \"Connect wallet\" prompt with no additional content. The purpose of the `/api/v1/inbox/34` path specifically is unclear; it does not map to any of the named endpoints on the landing page, so its actual functionality is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["ai","data","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["The endpoint path /api/v1/inbox/34 is not listed among the named endpoints on the landing page; its actual functionality is unknown.","No API documentation, request parameters, or response schemas are available anywhere on the site.","All documentation pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no content.","Without knowing what this endpoint actually does, callers risk paying $0.02 for an unknown response."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/34","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/inbox/34","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is no documentation, no request/response schema, and the specific /api/v1/inbox/34 path does not correspond to any named endpoint on the landing page. Its actual functionality is unknown. No examples or OpenAPI spec are 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'/api/v1/inbox/34':111,210 '/pricing':191 '/readme':193 '/request':19,38 '0.02':18,37,94,133 '000':128 '20':127 '402':122 '402 payment api' '6':138 'access':117,162 'across':54 'actual':231 'addit':204 'advertis':160 'ai':12,31,63 'ai-inference' 'analysi':67 'analyt':58 'api':5,24,45,116,152 'avail':175 'base':8,27,102,129,141 'base network api' 'broad':50 'call':4,23 'catalog':51 'categori':56 'challeng':123 'classif':70 'classification' 'commit':167 'connect':199 'content':205 'convers':87 'data':11,30,57 'data-analytics' 'decim':139 'descript':185 'document':168 'embed':71 'embeddings' 'enabl':44 'endpoint':16,35,53,90,110,176,224 'estim':81 'exact':148 'exampl':188 'exchang':76 'export':61 'expos':48 'feed':75 'financ':13,32,72 'finance-data' 'four':55 'function':232 'gas':80 'generat':88 'geocod':85 'geocoding' 'infrastructur':83 'insight':62 'instant':161 'key':153 'land':172,227 'learn':65 'limit':156 'list':113,174 'low payment fee' 'lowpaymentfee.com':39 'machin':64 'made':144 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'x402-payment'","prices":[{"id":"be1e21e6-2075-40bd-b219-3935c841214c","listingId":"5722efc1-f684-4a5f-907f-b5150b5a7f58","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/inbox/34","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.853Z"}],"sources":[{"listingId":"5722efc1-f684-4a5f-907f-b5150b5a7f58","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/34","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.853Z","lastSeenAt":"2026-04-22T04:02:46.283Z"}],"details":{"listingId":"5722efc1-f684-4a5f-907f-b5150b5a7f58","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/34 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all priced at $0.02/request.","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, instant access, on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/inbox/34 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","source_url":"https://lowpaymentfee.com/api/v1/inbox/34"}],"useCases":["Querying real-time financial data (prices, exchange rates, gas estimates) without API key management","Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-request payment basis","Accessing utility services like geocoding and data validation with minimal setup"],"bestFor":["Developers who want zero-signup, pay-per-use API access","Agent workflows that can settle USDC payments on Base via x402","Low-volume or sporadic API consumers who don't want subscriptions"],"notFor":["High-volume production workloads needing SLAs, documentation, or guaranteed uptime","Users who need detailed API documentation, request schemas, or response format guarantees","Teams without USDC on Base or x402-compatible payment infrastructure"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.874Z"},"updatedAt":"2026-04-22T04:02:46.283Z"}}