{"id":"1c574c04-afab-4626-a450-8366ddd27bbc","shortId":"EaGSqY","kind":"x402","title":"x402-gated card-transaction endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated card-transaction endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com exposes a card-transactions resource at `/api/v1/cards/33/transactions` behind an x402 payment challenge. It is part of a broader platform that offers dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe specific endpoint listed here accepts POST requests and is described by the provider simply as \"Premium API Access.\" The x402 challenge advertises a maximum amount of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, which uses 6 decimals), equating to $0.02 per call. Payment is made via the x402 `exact` scheme to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. No API keys or rate limits are advertised; access is granted purely through per-request micropayment.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/cards/33/transactions` resource actually returns or what input it expects. The endpoint is confirmed live (402 challenge captured), but without documentation it is difficult to determine the exact functionality beyond the generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","card-transactions","post-endpoint"],"categories":["finance","payments"],"synonyms":["card transactions API","x402 micropayment API","USDC pay-per-call","lowpaymentfee","Base network API","402 payment endpoint","card data API"],"warnings":["No documentation available — all doc/API/pricing/README pages return only 'Connect wallet' with no content.","No OpenAPI or request/response schema provided; input and output formats are unknown.","The specific purpose of /api/v1/cards/33/transactions is unclear — 'Premium API Access' is generic.","The hardcoded card ID '33' in the path suggests this may be a demo or placeholder endpoint."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/33/transactions","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/33/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, but there is zero documentation on request format, response schema, or what 'Premium API Access' for card transactions actually provides. No OpenAPI spec, no examples, and all doc pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/cards/33/transactions':202 '0.02':11,26,77,129 '000':116 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':142 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':122 '20':115 '300':145 '402':216 '402 payment endpoint' '6':125 'Base network API' 'USDC pay-per-call' 'accept':93 'access':106,156,235 'actual':204 'address':141 'advertis':110,155 'ai/ml':67 'amount':113 'analyt':66 'api':63,105,149,172,234 'asset':121 'base':9,24,86,117 'base-network' 'behind':43 'beyond':230 'broader':53 'call':62,131 'captur':218 'card':5,20,38 'card data API' 'card transactions API' 'card-transact':4,19,37 'card-transactions' 'challeng':47,109,217 'confirm':214 'connect':181 'content':187 'crawl':170 'data':65,70 'decim':126 'describ':98 'descript':198 'determin':226 'difficult':224 'doc':171 'document':165,221 'dozen':57 'endpoint':7,22,32,90,212 'equat':127 'exact':138,228 'exampl':195 'expect':210 'expos':35 'extrem':167 'finance/web3':69 'function':229 'gate':3,18 'generic':232 'grant':158 'infer':68 'infrastructur':72 'input':208 'key':150 'label':236 'limit':153 'list':91 'live':215 'lowpaymentfee' 'lowpaymentfee.com':34 'made':134 'maximum':112 'micropay':164 'network':87 'offer':56 'openapi':191 'page':176 'part':50 'pay':10,25,60 'pay-per-cal':59 'payment':46,132 'per':12,27,61,78,130,162 'per-request':161 'per-request-billing' 'platform':54 'post':94 'post-endpoint' 'premium':104,233 'price':75,173 'prompt':183 'provid':101 'pure':159 'rate':152 'readm':175 'request':13,28,79,95,163 'request/response':194 'resourc':40,203 'return':178,205 'schema':192 'scheme':139 'second':146 'settl':81 'simpli':102 'span':64 'spars':168 'specif':89 'timeout':147 'transact':6,21,39 'unit':118 'usdc':15,30,83,120 'usdc-micropayment' 'use':124 'util':73 'via':135 'wallet':182 'without':220 'x402':2,17,45,108,137 'x402 micropayment API' 'x402-gated':1,16 'x402-payment'","prices":[{"id":"1486c7b0-3d26-4684-8118-449295bee272","listingId":"1c574c04-afab-4626-a450-8366ddd27bbc","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/33/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:29.220Z"}],"sources":[{"listingId":"1c574c04-afab-4626-a450-8366ddd27bbc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/33/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:29.220Z","lastSeenAt":"2026-04-24T20:02:27.435Z"}],"details":{"listingId":"1c574c04-afab-4626-a450-8366ddd27bbc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/33/transactions \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equating to $0.02","source_url":"https://lowpaymentfee.com/api/v1/cards/33/transactions"},{"claim":"All APIs on the platform 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 & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving card transaction data via a single micropayment per request","Integrating pay-per-call card transaction lookups into agent workflows","Programmatic access to card-level transaction records without API key management"],"bestFor":["Agents that can settle x402 USDC payments on Base","Developers wanting keyless, pay-per-use card transaction data","Low-volume or sporadic access patterns where $0.02/request is cost-effective"],"notFor":["High-volume batch processing where per-request fees add up quickly","Users who need detailed API documentation or guaranteed SLAs before integrating","Non-crypto workflows that cannot settle USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:27.229Z"},"updatedAt":"2026-04-24T20:02:27.435Z"}}