{"id":"c3116985-909c-432e-8aa8-312c809bbe71","shortId":"pWvxgU","kind":"x402","title":"Premium API access via x402 micropayment on Base — $0.02 per request in USDC.","tagline":"Premium API access via x402 micropayment on Base — $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" gated by the x402 payment protocol. The site advertises a broad suite of API categories including 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). Each endpoint is priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/apikeys/35` is described as \"Premium API Access\" and returns a live x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02). Payment is made via the x402 exact scheme to wallet 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no examples available. It is unclear what specific data or functionality the `/api/v1/apikeys/35` endpoint returns (it may provision or retrieve an API key). The site's landing page lists many endpoints but provides no detailed documentation for any of them.","tags":[],"capabilities":["x402-payment","usdc-base","micropayment","pay-per-request","api-key-provisioning","json-response"],"categories":["infrastructure","api-gateway"],"synonyms":["x402 api access","micropayment api","pay-per-call api","USDC api payment","base network api","lowpaymentfee","api key generation"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages are all empty (wallet-connect only)","No OpenAPI or JSON schema provided for request or response bodies","The specific function of /api/v1/apikeys/35 is ambiguous — it may provision an API key or return account data, but this is unconfirmed","The site lists many endpoints but none have documented input/output contracts"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/35","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/apikeys/35","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 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. The purpose of the specific /api/v1/apikeys/35 endpoint is unclear. This is effectively a stub 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'/api/v1/apikeys/35':102,198 '/docs':160 '/pricing':162 '/readme':164 '0.02':9,22,89,130 '000':119 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':141 '0x8335':124 '20':118 '2913':125 '300':144 '6':128 'USDC api payment' 'accept':149 'access':3,16,34,108 'advertis':43 'ai':58 'analysi':62 'analyt':52 'api':2,15,33,48,107,207 'api key generation' 'api-key-provisioning' 'application/json':154 'avail':188 'base':8,21,97,120,127 'base network api' 'broad':45 'categori':49 'challeng':114 'classif':65 'connect':170 'content':176 'convers':82 'data':51,55,194 'decim':129 'describ':104 'detail':220 'document':155,221 'embed':66 'endpoint':28,85,101,148,199,216 'estim':76 'exact':137 'exampl':187 'exchang':71 'export':56 'extrem':157 'feed':70 'financ':67 'function':196 'gas':75 'gate':35 'generat':83 'geocod':80 'includ':50 'infrastructur':78 'insight':57 'json-response' 'key':208 'land':212 'learn':60 'list':214 'live':112 'lowpaymentfee' 'lowpaymentfee.com':30 'machin':59 'made':133 'mani':215 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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/apikeys/35","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:31.402Z"}],"sources":[{"listingId":"c3116985-909c-432e-8aa8-312c809bbe71","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/35","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:31.402Z","lastSeenAt":"2026-04-22T09:01:54.159Z"}],"details":{"listingId":"c3116985-909c-432e-8aa8-312c809bbe71","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/35 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a live x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/35"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/apikeys/35"},{"claim":"All listed 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 site advertises Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Acquiring premium API access via a single USDC micropayment on Base","Agent-driven pay-per-request API consumption without pre-registration","Programmatic API key provisioning gated by crypto payment"],"bestFor":["Developers wanting no-signup, pay-per-use API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before purchasing","High-volume consumers who need bulk pricing or rate-limit guarantees","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:29.094Z"},"updatedAt":"2026-04-22T09:01:54.159Z"}}