{"id":"ddabb367-7ee9-4949-87a5-f42c523c605b","shortId":"GShMBW","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 catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/keys/66` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, accounts, or subscriptions are required; callers attach an X-PAYMENT header with a signed USDC payment on Base.\n\nThe wider platform advertises four endpoint 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 listed endpoints share the same $0.02/request pricing. The platform claims no rate limits and instant access.\n\nImportant caveat: the specific endpoint probed (`/api/v1/keys/66`) does not clearly map to any of the named API categories on the landing page, and no documentation, request/response schemas, or usage examples are available beyond the landing page listing. The `/api`, `/pricing`, and `/README` pages all returned only a \"Connect wallet\" prompt with no substantive content. Without OpenAPI specs or example payloads, the actual functionality behind this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","micropayment API","x402 API","pay-per-call API","USDC API","Base network API","premium API access"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The endpoint path /api/v1/keys/66 does not correspond to any named API on the landing page — its actual functionality is unknown","All documentation pages (/api, /pricing, /README) returned only 'Connect wallet' with no content","No request or response examples available; callers cannot determine what to send or expect back","Platform claims 'no rate limits' which is unverifiable and unusual"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/66","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/keys/66","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, no documentation beyond a landing page, and the specific endpoint '/api/v1/keys/66' doesn't map to any described service. Effectively a stub 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'/api/v1/keys/66':69,185 '/pricing':218 '/readme':220 '/request':19,38,168 '0.02':18,37,80,167 '000':84 '20':83 '6':90 'Base network API' 'USDC API' 'access':75,178 'account':102 'actual':240 'advertis':124 'ai':12,31,135 'ai-inference' 'analysi':139 'analyt':129 'api':5,24,45,74,100,195 'attach':108 'avail':210 'base':8,27,63,85,120 'base-network' 'behind':242 'beyond':211 'broad':50 'call':4,23,82 'caller':107 'catalog':51 'categori':127,196 'caveat':180 'claim':172 'classif':142 'clear':188 'connect':226 'content':232 'convers':159 'cost':77 'data':11,30,128,132 'data-analytics' 'decim':91 'document':203 'embed':143 'enabl':44 'endpoint':16,35,57,67,126,163,183,244 'estim':153 'exampl':208,237 'exchang':148 'export':133 'feed':147 'financ':13,32,144 'finance-data' 'four':125 'function':241 'gas':152 'generat':160 'geocod':157 'handl':94 'header':113 'import':179 'infrastructur':155 'insight':134 'instant':177 'key':101 'land':199,213 'learn':137 'limit':175 'list':71,162,215 'low 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'x402-payment'","prices":[{"id":"588fd6af-440e-4e12-b4db-3853bd9be3bb","listingId":"ddabb367-7ee9-4949-87a5-f42c523c605b","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/keys/66","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.816Z"}],"sources":[{"listingId":"ddabb367-7ee9-4949-87a5-f42c523c605b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/66","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.816Z","lastSeenAt":"2026-04-22T01:02:19.243Z"}],"details":{"listingId":"ddabb367-7ee9-4949-87a5-f42c523c605b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/66 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-signed-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge requesting up to 20,000 base units of USDC (asset 0x8335…) on Base network","source_url":"https://lowpaymentfee.com/api/v1/keys/66"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand API access without signup or API key management","Micropayment-gated data retrieval for analytics or financial data","AI inference tasks (sentiment, summarization, classification, embeddings) paid per call","Utility operations like geocoding or data conversion with no subscription commitment"],"bestFor":["AI agents that can settle USDC payments on Base via x402","Developers wanting zero-commitment, pay-as-you-go API access","Use cases requiring small, infrequent API calls where subscriptions are wasteful"],"notFor":["High-volume production workloads where per-call pricing adds up quickly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Callers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.208Z"},"updatedAt":"2026-04-22T01:02:19.243Z"}}