{"id":"7b6dfb78-8542-481f-9e41-b65a46f56374","shortId":"VzjGF3","kind":"x402","title":"x402-gated premium API endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated premium API endpoint on Base, pay-per-call with USDC.","description":"This endpoint at `/api/v1/cards/58` 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/58` is labeled \"Premium API Access\" but its exact functionality is not documented beyond that title. The endpoint is live and returns a valid x402 challenge.\n\nPayment is settled on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) with the \"exact\" payment scheme. The maximum amount required per call is 20,000 base units, which at 6 decimals equals $0.02 USD per request. The platform advertises uniform $0.02/request pricing across all endpoints, no API keys, no rate limits, and instant access.\n\nThe `/cards/58` path does not appear in the site's publicly listed API catalog, which covers analytics, AI, finance, and utility endpoints. No OpenAPI schema, detailed documentation, or example request/response payloads are available for this specific endpoint. The crawled docs, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no substantive content. Without further documentation it is unclear what data or service this particular card endpoint returns.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key"],"categories":["api-gateway","payments"],"synonyms":["lowpaymentfee","x402 api","pay per call api","USDC micropayment api","base network api","402 payment required"],"warnings":["The /api/v1/cards/58 path is not listed among the site's publicly advertised endpoints — its purpose is unclear.","No OpenAPI spec, request schema, or response schema is available for this endpoint.","All documentation pages (docs, pricing, README, api) returned only a 'Connect wallet' prompt with no substantive content.","The exact data or service returned by this endpoint is unknown."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/58","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/58","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 challenge, but the specific /cards/58 resource is not listed in the site's public catalog, has no documentation, no schema, and no example payloads. The crawled docs/pricing/README pages were empty beyond a wallet-connect prompt. Effectively a stub 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'/cards/58':63,145 '/request':130 '0.02':121,129 '000':113 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':99 '20':112 '402 payment required' '6':118 'USDC micropayment api' 'access':68,143 'across':132 'advertis':127 'ai':161 'ai/ml':53 'amount':107 'analyt':52,160 'api':5,19,49,67,136,156 'appear':149 'avail':176 'base':8,22,94,114 'base network api' 'base-network' 'beyond':76 'call':12,26,110 'card':211 'catalog':157 'challeng':88 'collect':40 'connect':192 'content':198 'contract':98 'cover':159 'crawl':182 'data':51,206 'decim':119 'detail':169 'doc':183 'document':75,170,201 'endpoint':6,20,30,80,134,165,180,212 'equal':120 'exact':71,102 'exampl':172 'financ':162 'finance/web3':55 'function':72 'gate':3,17 'infer':54 'infrastructur':57 'instant':142 'key':137 'label':65 'limit':140 'list':155 'live':82 'lowpaymentfee' 'lowpaymentfee.com':37 'maximum':106 'network':95 'no-api-key' 'openapi':167 'page':187 'part':34 'particular':210 'path':146 'pay':10,24,46 'pay per call api' 'pay-per-cal':9,23 'pay-per-request':45 'payload':174 'payment':89,103 'per':11,25,47,109,123 'platform':38,126 'premium':4,18,66 'price':131,184 'prompt':194 'protocol':44 'public':154 'rate':139 'readm':186 'render':189 'request':48,124 'request/response':173 'requir':108 'resourc':61 'return':84,213 'schema':168 'scheme':104 'servic':208 'settl':91 'site':152 'span':50 'specif':60,179 'substant':197 'titl':78 'unclear':204 'uniform':128 'unit':115 'usd':122 'usdc':14,28,97 'usdc-settlement' 'use':96 'util':58,164 'valid':86 'wallet':193 'without':199 'x402':2,16,43,87 'x402 api' 'x402-gated':1,15 'x402-payment' 'x402-protocol':42","prices":[{"id":"1db3d799-c320-4c0a-8ad0-e75f05565a1f","listingId":"7b6dfb78-8542-481f-9e41-b65a46f56374","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/58","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:49.766Z"}],"sources":[{"listingId":"7b6dfb78-8542-481f-9e41-b65a46f56374","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/58","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:49.766Z","lastSeenAt":"2026-04-24T06:32:00.344Z"}],"details":{"listingId":"7b6dfb78-8542-481f-9e41-b65a46f56374","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/58 \\\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 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/58"},{"claim":"The platform advertises $0.02/request pricing, no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/58"}],"useCases":["Agent-initiated API calls with automatic USDC micropayments on Base","Accessing premium data or services without traditional API key registration","Programmatic pay-as-you-go access from autonomous agents"],"bestFor":["Developers or agents wanting keyless, pay-per-request API access","Users who prefer crypto micropayments over subscription billing","Base-network USDC holders looking for low-friction API consumption"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Anyone without a Base-network USDC wallet","Use cases requiring free or high-volume bulk access"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.257Z"},"updatedAt":"2026-04-24T06:32:00.344Z"}}