{"id":"c4be8e02-683c-43f2-abbf-ddadece88c9b","shortId":"mc5bBe","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 USDC micropayments on the Base network. The specific endpoint `/api/v1/cards/77` 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 made via the x402 exact scheme — no API keys, no rate limits, and no 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 and settle in USDC on Base.\n\nNote that the specific functionality behind `/api/v1/cards/77` is not documented beyond the generic \"Premium API Access\" label. There is no OpenAPI schema, no request/response examples, and the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional content. Prospective users should be aware that the actual behavior of this endpoint is unclear from available documentation.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","json-response","post-method"],"categories":["api-marketplace","payments"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API","Base network API","lowpaymentfee","low payment fee"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The specific functionality of /api/v1/cards/77 ('Premium API Access') is undocumented — it is unclear what data or service it returns","All secondary pages (docs, pricing, API, README) render only 'Connect wallet' with no usable content","No request body schema or response schema is provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/77","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/77","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 OpenAPI schema, no request/response examples, and no documentation beyond a generic label. The docs, pricing, and API pages are empty stubs. The actual functionality of /api/v1/cards/77 is 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'/request':17,34,154 '0.02':16,33,75,153 '000':79 '20':78 '6':85 'Base network API' 'USDC API' 'access':45,70,178 'actual':213 'addit':204 'advertis':108 'ai':10,27,120 'analysi':124 'analyt':114 'api':4,21,41,69,96,177,193 'avail':221 'awar':210 'base':7,24,59,80,162 'base-network' 'behavior':214 'behind':51,168 'beyond':173 'broader':106 'call':77 'categori':110 'classif':127 'connect':199 'content':205 'convers':144 'cost':72 'data':9,26,113,117 'decim':86 'doc':190 'document':172,222 'embed':128 'endpoint':14,31,50,63,112,147,217 'estim':138 'exact':93 'exampl':187 'exchang':133 'export':118 'feed':132 'financ':11,28,129 'four':109 'function':167 'gas':137 'gate':3,20,44 'generat':145 'generic':175 'geocod':142 'infrastructur':140 'insight':119 'json-response' 'key':97 'label':179 'learn':122 'limit':100 'list':66,149 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':121 'made':89 'marketplac':42 'metric':115 'micropay':56 'micropayment API' 'network':60 'no-api-key' 'note':163 'offer':8,25 'openapi':183 'page':194 'pay-per-request API' 'payment':87 'per':53,76 'per-request':52 'per-request-billing' 'platform':5,22,107 'point':156 'post-method' 'premium':68,176 'price':131,155,191 'prompt':201 'prospect':206 'protocol':40 'quot':136 'rate':99,134 'render':196 'report':116 'request':54 'request/response':186 'requir':104 'schema':184 'scheme':94 'sentiment':123 'settl':158 'specif':62,166 'subscript':103 'summar':126 'text':125 'token':135 'unclear':219 'unit':81 'usdc':55,83,160 'usdc-micropayment' 'user':207 'util':13,30,141 'valid':143 'varieti':48 'via':90 'wallet':200 'web3':130 'x402':2,19,39,92 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"ca280319-6825-49b3-96c2-cc3bf31b56c0","listingId":"c4be8e02-683c-43f2-abbf-ddadece88c9b","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/77","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:52.113Z"}],"sources":[{"listingId":"c4be8e02-683c-43f2-abbf-ddadece88c9b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/77","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:52.113Z","lastSeenAt":"2026-04-23T02:31:11.506Z"}],"details":{"listingId":"c4be8e02-683c-43f2-abbf-ddadece88c9b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/77 \\\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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 in USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/77"},{"claim":"All endpoints are listed at $0.02/request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without subscription or API key management","Making one-off paid API calls settled in USDC on Base","Agent-driven programmatic access to gated endpoints via x402 protocol"],"bestFor":["Developers wanting zero-commitment pay-per-call API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over traditional billing"],"notFor":["Users needing detailed API documentation or schemas before purchasing","Anyone without a Base-compatible USDC wallet","High-volume consumers who need bulk pricing or rate guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.134Z"},"updatedAt":"2026-04-23T02:31:11.506Z"}}