{"id":"b3c4da61-6b46-49f7-be62-1046a2b42ded","shortId":"5Cutg5","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API marketplace that gates access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/cards/34` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a max amount of 20,000 base units of USDC (0x8335…), which equals $0.02 per request (USDC uses 6 decimals). Payment is made via the x402 exact scheme with no API keys, rate limits, or subscriptions required.\n\nThe broader platform advertises four categories of endpoints: 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/request price point.\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 schema, no request/response examples, and no detailed documentation for any endpoint. The specific functionality behind `/api/v1/cards/34` (\"Premium API Access\") is unclear and cannot be determined from available material. The endpoint is live and returns a valid 402 challenge, but without documentation it is difficult to know what data or service it actually provides.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint"],"categories":["api-marketplace","misc"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API","Base network API","lowpaymentfee"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","The specific functionality of /api/v1/cards/34 ('Premium API Access') is completely undocumented; its purpose is unknown.","No OpenAPI schema or request/response examples are provided for any endpoint.","No robots.txt or agents.txt found on the domain."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/34","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/34","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 USDC payments on Base at $0.02/request. However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. The specific purpose of /api/v1/cards/34 is undocumented and 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'/request':17,34,168 '0.02':16,33,95,167 '000':87 '0x8335':92 '20':86 '402':233 '6':100 'Base network API' 'USDC API' 'accept':75 'access':45,73,215 'actual':248 'advertis':81,122 'ai':10,27,134 'amount':84 'analysi':138 'analyt':128 'api':4,21,41,72,112,177,214 'avail':223 'base':7,24,61,88 'base-network' 'behind':51,211 'broader':120 'cannot':219 'categori':124 'challeng':80,234 'classif':141 'connect':186 'content':192 'convers':158 'data':9,26,127,131,244 'decim':101 'detail':203 'determin':221 'difficult':240 'doc':176 'document':171,204,237 'embed':142 'endpoint':14,31,50,65,126,161,207,226 'equal':94 'estim':152 'exact':108 'exampl':200 'exchang':147 'export':132 'extrem':173 'feed':146 'financ':11,28,143 'four':123 'function':210 'gas':151 'gate':3,20,44 'generat':159 'geocod':156 'infrastructur':154 'insight':133 'key':113 'know':242 'learn':136 'limit':115 'list':69,163 'live':228 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':135 'made':104 'marketplac':42 'materi':224 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'x402-protocol':38","prices":[{"id":"3a12f685-fcb1-4154-ae02-b729bfa54dfe","listingId":"b3c4da61-6b46-49f7-be62-1046a2b42ded","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/cards/34","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:27.971Z"}],"sources":[{"listingId":"b3c4da61-6b46-49f7-be62-1046a2b42ded","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/34","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:27.971Z","lastSeenAt":"2026-04-22T10:01:39.758Z"}],"details":{"listingId":"b3c4da61-6b46-49f7-be62-1046a2b42ded","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/34 \\\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 valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/34"},{"claim":"All endpoints are priced at $0.02/request with no API keys, rate limits, or minimums","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 contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/34"}],"useCases":["Paying per-request for API access without subscriptions or API keys","Integrating x402-compatible agents with low-cost utility endpoints","Accessing data, AI, or finance endpoints via crypto micropayments"],"bestFor":["Developers wanting zero-commitment pay-per-use API access","x402-compatible AI agents needing cheap utility endpoints","Projects already operating on the Base L2 network"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-request pricing may add up versus flat-rate plans","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:27.229Z"},"updatedAt":"2026-04-22T10:01:39.758Z"}}