{"id":"6248253f-b9c8-4a9b-a3e7-6288725fcc95","shortId":"38QBCd","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 `/api/v1/cards/48` is listed as \"Premium API Access\" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 exact scheme — no API keys, accounts, or rate limits are required; callers simply attach an X-PAYMENT header with a valid payment proof.\n\nThe broader platform advertises four categories of APIs: 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\nHowever, the specific functionality behind `/api/v1/cards/48` is not documented — the path pattern (\"cards/48\") does not match any of the advertised API categories, and the description is simply \"Premium API Access\" with no further detail. The docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. Without documentation or example responses, the actual behavior of this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-request-micropayment","no-api-key","json-response","post-method"],"categories":["api-marketplace","payments"],"synonyms":["x402 API","micropayment API","pay-per-call API","USDC API","Base network API","lowpaymentfee","402 payment endpoint"],"warnings":["The endpoint path /api/v1/cards/48 does not match any of the documented API categories on the site — its actual functionality is unknown.","All documentation pages (docs, pricing, README, api) returned only a 'Connect wallet' prompt with no substantive content.","No OpenAPI spec, input schema, or output schema is available for this endpoint.","No example responses are available to verify what data is returned after payment."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/48","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/48","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). However, the specific endpoint /api/v1/cards/48 has no documentation, no input/output schema, no example requests or responses, and the path does not correspond to any advertised API category. All doc pages returned only 'Connect wallet' with no 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'/request':17,34,166 '0.02':16,33,75,165 '000':79 '20':78 '402 payment endpoint' '6':85 'Base network API' 'USDC API' 'access':45,72,198 'account':98 'actual':226 'advertis':120,188 'ai':10,27,132 'analysi':136 'analyt':126 'api':4,21,41,71,96,124,189,197 'attach':106 'base':7,24,61,80 'base-network' 'behavior':227 'behind':51,173 'broader':118 'call':77 'caller':104 'cards/48':181 'categori':122,190 'classif':139 'connect':213 'content':219 'convers':156 'cost':74 'data':9,26,125,129 'decim':86 'descript':193 'detail':202 'doc':204 'document':177,221 'embed':140 'endpoint':14,31,50,65,159,230 'estim':150 'exact':93 'exampl':223 'exchang':145 'export':130 'feed':144 'financ':11,28,141 'four':121 'function':172 'gas':149 'gate':3,20,44 'generat':157 'geocod':154 'handl':89 'header':111 'howev':169 'infrastructur':152 'insight':131 'json-response' 'key':97 'learn':134 'limit':101 'list':68,161 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':133 'marketplac':42 'match':184 'metric':127 'micropay':55 'micropayment API' 'network':62 'no-api-key' 'offer':8,25 'page':208 'path':179 'pattern':180 'pay-per-call API' 'payment':87,110,115 'per':53,76 'per-request':52 'per-request-micropayment' 'platform':5,22,119 'point':168 'post-method' 'premium':70,196 'price':143,167,205 'prompt':215 'proof':116 'protocol':40 'quot':148 'rate':100,146 'readm':207 'report':128 'request':54 'requir':103 'respons':224 'return':210 'scheme':94 'sentiment':135 'settl':56 'simpli':105,195 'specif':64,171 'substant':218 'summar':138 'text':137 'token':147 'unit':81 'unknown':232 'usdc':58,83 'usdc-settlement' 'util':13,30,153 'valid':114,155 'varieti':48 'via':90 'wallet':214 'web3':142 'without':220 'x':109 'x-payment':108 'x402':2,19,39,92 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"63268768-1b5b-430b-86bb-8c7d606c65f2","listingId":"6248253f-b9c8-4a9b-a3e7-6288725fcc95","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/48","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:38.838Z"}],"sources":[{"listingId":"6248253f-b9c8-4a9b-a3e7-6288725fcc95","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/48","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:38.838Z","lastSeenAt":"2026-04-23T04:01:14.291Z"}],"details":{"listingId":"6248253f-b9c8-4a9b-a3e7-6288725fcc95","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/48 \\\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 x402 challenge with maxAmountRequired of 20000 in USDC (asset 0x8335…) on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/48"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Four API categories are listed: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to gated API resources without traditional API key management","Agent-driven workflows that need pay-per-call endpoints settled on-chain","Exploring x402 protocol integrations with USDC on Base"],"bestFor":["Developers experimenting with x402 micropayment protocol","AI agents that need keyless, pay-per-request API access","Projects already operating on the Base L2 network with USDC"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Applications requiring free or subscription-based pricing models","Anyone needing to understand exactly what /api/v1/cards/48 returns before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.744Z"},"updatedAt":"2026-04-23T04:01:14.291Z"}}