{"id":"3916488b-a4af-4f24-b917-b8089f72eedb","shortId":"FKHZjS","kind":"x402","title":"Premium API access endpoint on Base via x402 — pay $0.02 per request in USDC.","tagline":"Premium API access endpoint on Base via x402 — pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a broad catalog of pay-per-call APIs spanning data & analytics, 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.\n\nThe specific endpoint `/api/v1/apikeys/40` is labeled \"Premium API Access\" in the x402 challenge. Its exact functionality is not documented beyond that label — it may provide API key generation or management, but this is speculative based on the URL path. The x402 challenge confirms the endpoint is live, accepts POST requests, and requires a payment of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the `exact` scheme with a 300-second timeout.\n\nThe platform advertises no API keys required, no rate limits, and instant access. Documentation pages (/docs, /pricing, /api, /README) all rendered only a \"Connect wallet\" prompt with no substantive content, so detailed request/response schemas and usage guides are unavailable.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","api-key-management","post-endpoint"],"categories":["infrastructure","api-access"],"synonyms":["premium API","API key endpoint","x402 API","pay-per-call API","lowpaymentfee","USDC API access","Base network API"],"warnings":["The exact purpose and response format of /api/v1/apikeys/40 is unknown — 'Premium API Access' is the only description available.","All documentation pages (/docs, /pricing, /api, /README) returned no substantive content, only a 'Connect wallet' prompt.","No OpenAPI spec, no request/response schema, and no usage examples are available.","The broader platform lists many endpoints (AI, finance, analytics, utils) but none have documented schemas either."],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/40","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/40","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, but the specific functionality of /api/v1/apikeys/40 is undocumented. All documentation pages render only 'Connect wallet' with no content. No request/response schema, no examples, and no explanation of what 'Premium API Access' actually returns. Pricing is clear ($0.02/request in USDC on 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'/api/v1/apikeys/40':111 '/docs':208 '/pricing':209 '/readme':211 '0.02':10,24,98,175 '000':164 '0x8335':169 '20':163 '2913':170 '300':190 '6':179 'API key endpoint' 'Base network API' 'USDC API access' 'accept':155 'access':3,17,36,116,205 'advertis':195 'ai':67 'analysi':71 'analyt':66 'api':2,16,35,63,115,133,197 'api-key-management' 'base':6,20,106,142,165,172 'beyond':127 'broad':56 'call':62 'catalog':57 'challeng':120,149 'classif':74 'confirm':150 'connect':216 'content':222 'convers':91 'data':65 'decim':180 'detail':224 'document':126,206 'embed':75 'endpoint':4,18,30,47,94,110,152 'equal':174 'estim':85 'exact':122,186 'exchang':80 'feed':79 'financ':76 'function':123 'gas':84 'generat':92,135 'geocod':89 'given':176 'guid':229 'host':54 'infrastructur':87 'instant':204 'key':134,198 'label':113,129 'learn':69 'limit':202 'live':154 'lowpaymentfee' 'lowpaymentfee.com':32,51 'machin':68 'made':183 'manag':137 'mani':46 'may':131 'network':107 'offer':48 'one':44 'page':207 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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/40","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:21.063Z"}],"sources":[{"listingId":"3916488b-a4af-4f24-b917-b8089f72eedb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/40","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:21.063Z","lastSeenAt":"2026-04-23T09:31:52.643Z"}],"details":{"listingId":"3916488b-a4af-4f24-b917-b8089f72eedb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/40 \\\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":"Endpoint returns a valid x402 challenge with status 402, confirming it is live.","source_url":"https://lowpaymentfee.com/api/v1/apikeys/40"},{"claim":"Payment amount is 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02.","source_url":"https://lowpaymentfee.com/api/v1/apikeys/40"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access.","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only a 'Connect wallet' prompt with no substantive content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatically obtaining or managing API keys via a single paid request","Agent-driven access to a premium API resource without pre-registration","Demonstrating x402 micropayment integration on Base"],"bestFor":["Developers exploring x402 pay-per-call patterns on Base","AI agents that need to purchase API access on-the-fly without signup","Projects needing low-cost, no-commitment API access"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume use cases where $0.02 per request adds up significantly","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:29.553Z"},"updatedAt":"2026-04-23T09:31:52.643Z"}}