{"id":"a69c6d36-0354-43f6-99e6-75b6e04c6abe","shortId":"bcJAGD","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/93` 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 simply attach an X-PAYMENT header with a valid payment proof.\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 endpoints are listed at the same $0.02 per request price point.\n\nHowever, the specific functionality behind the `/api/v1/keys/93` endpoint is unclear. The description simply says \"Premium API Access\" with no further documentation, input/output schema, or examples. The crawled docs pages (/api, /pricing, /README) all returned only a \"Connect wallet\" prompt with no substantive content. Without documentation or schema details, it is difficult to know what this particular endpoint returns or what input it expects beyond a POST request.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method","json-response"],"categories":["api-marketplace","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","premium api access"],"warnings":["No documentation available for this specific endpoint — purpose of /api/v1/keys/93 is unknown","No input or output schema provided; callers cannot know what to send or expect back","All documentation pages (/api, /pricing, /README) returned only 'Connect wallet' with no content","The endpoint name 'Premium API Access' is generic and does not describe functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/93","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/93","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no input/output schema, no examples, and the purpose of this specific endpoint (/api/v1/keys/93) is entirely opaque. The crawled doc pages were empty beyond a wallet-connect 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'/api/v1/keys/93':69,178 '/pricing':202 '/readme':203 '/request':19,38 '0.02':18,37,80,167 '000':84 '20':83 '6':90 'access':75,188 'account':102 'advertis':123 'ai':12,31,134 'analysi':138 'analyt':128 'api':5,24,45,74,100,187 'attach':109 'base':8,27,63,85 'base network api' 'base-network' 'behind':176 'beyond':235 'broad':50 'call':4,23,82 'caller':107 'catalog':51 'categori':126 'classif':141 'connect':208 'content':214 'convers':158 'cost':77 'crawl':198 'data':11,30,127,131 'decim':91 'descript':183 'detail':219 'difficult':222 'doc':199 'document':192,216 'embed':142 'enabl':44 'endpoint':16,35,57,67,125,161,179,228 'estim':152 'exampl':196 'exchang':147 'expect':234 'export':132 'feed':146 'financ':13,32,143 'four':124 'function':175 'gas':151 'generat':159 'geocod':156 'handl':94 'header':114 'howev':172 'infrastructur':154 'input':232 'input/output':193 'insight':133 'json-response' 'key':101 'know':224 'learn':136 'list':71,163 'low payment fee' 'lowpaymentfee.com':39 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'x402-payment'","prices":[{"id":"75edab73-b275-4b89-9494-af27c3d854ae","listingId":"a69c6d36-0354-43f6-99e6-75b6e04c6abe","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/93","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.213Z"}],"sources":[{"listingId":"a69c6d36-0354-43f6-99e6-75b6e04c6abe","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/93","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.213Z","lastSeenAt":"2026-04-22T01:02:19.749Z"}],"details":{"listingId":"a69c6d36-0354-43f6-99e6-75b6e04c6abe","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/93 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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 with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/93"},{"claim":"All endpoints are listed 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 across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/keys/93"}],"useCases":["Programmatic access to a pay-per-call API without needing an account or API key","Agent-driven workflows that need on-demand API access with crypto micropayments","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers exploring x402 pay-per-call patterns","AI agents that need frictionless API access without pre-registration","Users who want to pay per request in USDC on Base"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Anyone requiring non-crypto payment methods","High-volume use cases where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:04.518Z"},"updatedAt":"2026-04-22T01:02:19.749Z"}}