{"id":"de658cb0-8b79-4fb0-b3da-c36d70da6a1f","shortId":"7cY83y","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","description":"This endpoint at lowpaymentfee.com provides a collection of pay-per-call APIs gated by the x402 protocol on the Base network. The specific endpoint `/api/v1/cards/61` is listed as \"Premium API Access\" and costs $0.02 per request, paid in USDC (USD Coin) on Base. The x402 challenge confirms the endpoint is live and accepts exact-scheme payments to address 0x1A2B…85F3 with a max amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals).\n\nThe broader lowpaymentfee.com platform advertises multiple API categories including 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 priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments.\n\nHowever, the specific functionality behind `/api/v1/cards/61` is not documented beyond the generic label \"Premium API Access.\" 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 further content. The actual payload format and response structure for this particular endpoint remain unknown.","tags":[],"capabilities":["x402-payment","per-call-pricing","usdc-payment","base-network","no-api-key","pay-per-use"],"categories":["api-gateway","misc"],"synonyms":["lowpaymentfee","x402 api","pay-per-call api","USDC micropayment api","Base network api","premium api access","low fee api"],"warnings":["The specific functionality of /api/v1/cards/61 ('Premium API Access') is not documented — it is unclear what data or service this endpoint returns.","No OpenAPI schema, request format, or response examples are available.","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no further content.","The endpoint name 'cards/61' suggests a generic or placeholder resource; actual utility is unverified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/61","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/61","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and the specific functionality of /api/v1/cards/61 is undocumented. Docs pages render only 'Connect wallet' with no usable 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'0.02':10,28,71,109,162 '000':105 '0x1a2b':97 '20':104 '6':113 '85f3':98 'Base network api' 'USDC micropayment api' 'accept':90 'access':6,24,68,191 'actual':219 'address':96 'advertis':119 'ai':131 'amount':102 'analysi':135 'analyt':125 'api':5,16,23,34,49,67,121,167,190,205 'base':8,26,57,80,106 'base-network' 'behind':180 'beyond':185 'broader':116 'call':48 'categori':122 'challeng':83 'classif':138 'coin':78 'collect':43 'commit':175 'confirm':84 'connect':211 'content':217 'convers':155 'cost':70 'data':124,128 'decim':114 'doc':202 'document':184 'embed':139 'endpoint':38,61,86,158,228 'estim':149 'exact':92 'exact-schem':91 'exampl':199 'exchang':144 'export':129 'feed':143 'financ':140 'format':221 'function':179 'gas':148 'gate':3,21,50 'generat':156 'generic':187 'geocod':153 'given':110 'howev':176 'i.e':108 'includ':123 'infrastructur':151 'insight':130 'key':17,35,168 'label':188 'learn':133 'limit':171 'list':64 'live':88 'low fee api' 'lowpaymentfee' 'lowpaymentfee.com':40,117 'machin':132 'max':101 'metric':126 'minimum':174 'multipl':120 'network':58 'no-api-key' 'openapi':195 'page':206 'paid':74 'particular':227 'pay':9,27,46 'pay-per-cal':45 'pay-per-call api' 'pay-per-use' 'payload':220 'payment':94 'per':11,29,47,72,163 'per-call-pricing' 'platform':118 'premium':4,22,66,189 'premium api access' 'price':142,160,203 'prompt':213 'protocol':54 'provid':41 'quot':147 'rate':145,170 'remain':229 'render':208 'report':127 'request':12,30,73,164 'request/response':198 'requir':18,36 'respons':223 'schema':196 'scheme':93 'sentiment':134 'specif':60,178 'structur':224 'summar':137 'text':136 'token':146 'unit':107 'unknown':230 'usd':77 'usdc':14,32,76,111 'usdc-payment' 'util':152 'valid':154 'wallet':212 'web3':141 'x402':2,20,53,82 'x402 api' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"d77b408e-da03-430c-a245-e6556909e5de","listingId":"de658cb0-8b79-4fb0-b3da-c36d70da6a1f","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/61","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:40.642Z"}],"sources":[{"listingId":"de658cb0-8b79-4fb0-b3da-c36d70da6a1f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/61","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:40.642Z","lastSeenAt":"2026-04-22T10:31:28.960Z"}],"details":{"listingId":"de658cb0-8b79-4fb0-b3da-c36d70da6a1f","quickStartSnippet":"# Send a POST with x402 payment header to access the endpoint\ncurl -X POST https://lowpaymentfee.com/api/v1/cards/61 \\\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 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/61"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network","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"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/61"}],"useCases":["Paying per request for API access without managing API keys or subscriptions","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Accessing premium data or utility endpoints with micropayments"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents with x402-compatible payment capabilities on Base","Users who prefer crypto micropayments over traditional billing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","Applications requiring high-throughput batch processing with predictable flat-rate pricing","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.626Z"},"updatedAt":"2026-04-22T10:31:28.960Z"}}