{"id":"13b698e3-d5b6-4397-b775-efe96584fa59","shortId":"ZS3nJw","kind":"x402","title":"x402-gated premium API endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated premium API endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at `/api/v1/cards/92` is part of the lowpaymentfee.com platform, a collection of x402-protocol pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. The specific resource at `/cards/92` is labeled \"Premium API Access\" but its exact functionality is not documented beyond that label. It is one of many endpoints on the platform, all priced uniformly at $0.02 per call.\n\nPayment is handled via the x402 protocol on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The challenge advertises a `maxAmountRequired` of 20,000 base units, which at 6 decimals equals $0.02. No API keys or rate limits are required — callers simply attach an `X-PAYMENT` header with a valid x402 payment proof. The endpoint accepts POST requests and returns `application/json`.\n\nThe broader platform offers endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, and more — all at the same $0.02/request price point. However, documentation is extremely thin: the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples available. The exact purpose and output of `/api/v1/cards/92` specifically is unclear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","post-method"],"categories":["api","payments"],"synonyms":["premium API","x402 API","pay-per-call API","USDC micropayment API","lowpaymentfee","Base network API","402 payment endpoint"],"warnings":["The specific functionality of /api/v1/cards/92 ('Premium API Access') is completely undocumented — its purpose, expected input, and output are unknown.","No OpenAPI spec, request schema, or response schema is available anywhere on the site.","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no technical content.","The platform lists many endpoints but none have detailed documentation visible to crawlers."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/92","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/cards/92","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, confirming it accepts payments. However, there is no documentation, no OpenAPI spec, no request/response schema, and no explanation of what '/api/v1/cards/92' actually returns. The docs pages are empty beyond a wallet connect prompt. This is effectively a stub 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'/cards/92':63 '/request':181 '0.02':10,24,92,125,180 '000':117 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':109 '20':116 '402 payment endpoint' '6':122 'Base network API' 'USDC micropayment API' 'accept':150 'access':68 'advertis':112 'ai/ml':53 'analysi':163 'analyt':52 'api':5,19,49,67,127,191 'application/json':155 'attach':136 'avail':220 'base':8,22,104,118 'beyond':76 'broader':157 'call':94 'caller':134 'challeng':111 'classif':166 'collect':40 'connect':200 'contract':108 'data':51 'decim':123 'detail':207 'doc':190 'document':75,185 'embed':167 'endpoint':6,20,30,84,149,160 'equal':124 'exact':71,222 'exampl':219 'exchang':170 'extrem':187 'feed':169 'finance/web3':55 'function':72 'gate':3,17 'geocod':172 'handl':97 'header':141 'howev':184 'infer':54 'infrastructur':57 'json-response' 'key':128 'label':65,78 'limit':131 'lowpaymentfee' 'lowpaymentfee.com':37 'mani':83 'maxamountrequir':114 'network':105 'no-api-key' 'offer':159 'one':81 'openapi':211 'output':225 'page':195 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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/cards/92","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:01.876Z"}],"sources":[{"listingId":"13b698e3-d5b6-4397-b775-efe96584fa59","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/92","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:01.876Z","lastSeenAt":"2026-04-22T13:30:56.357Z"}],"details":{"listingId":"13b698e3-d5b6-4397-b775-efe96584fa59","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/92 \\\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 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/92"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/cards/92"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys or rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a premium API resource with per-request USDC micropayments","Integrating x402-gated endpoints into agent workflows without API key management","Paying for API calls on-chain via the Base L2 network"],"bestFor":["Developers experimenting with x402 pay-per-request protocols","Agents that can settle USDC payments on Base","Use cases requiring keyless, permissionless API access"],"notFor":["Users who need detailed API documentation or request/response schemas before integrating","Applications requiring free or subscription-based API access","Production systems that need guaranteed SLAs or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.576Z"},"updatedAt":"2026-04-22T13:30:56.357Z"}}