{"id":"2fd5e6a8-974c-4a28-9ecf-f906c837a2ba","shortId":"kK4xk8","kind":"x402","title":"x402-gated card-transactions endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated card-transactions 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/95/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 (`/cards/95/transactions`) appears to be a financial or card-related transactions resource. The x402 challenge confirms it accepts POST requests, charges up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals), and pays out to a specified Ethereum address on Base. No API keys or rate limits are advertised; access is gated purely by the x402 micropayment protocol.\n\nDocumentation on the site is extremely thin — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the card-transactions endpoint actually returns or what POST body it expects. The platform's landing page lists many endpoints but provides no detail beyond names and prices. As a result, the actual functionality and data returned by this specific endpoint remain unclear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","card-transactions","post-method","micropayment-gated"],"categories":["finance","payments"],"synonyms":["card transactions API","x402 finance endpoint","USDC micropayment API","lowpaymentfee","Base network API","pay-per-call transactions","card data endpoint"],"warnings":["No API documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","No OpenAPI or request/response schema provided; request body format for POST is unknown","The specific purpose and data returned by /api/v1/cards/95/transactions is undocumented","The endpoint path references a hardcoded card ID (95), which may indicate a demo or placeholder resource"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/95/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/95/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no request/response documentation, no examples, and the docs pages are empty. The purpose of this specific card-transactions endpoint is not explained anywhere. This is effectively a stub 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'/cards/95/transactions':93 '0.02':11,26,77,123 '000':117 '20':116 '6':127 'Base network API' 'USDC micropayment API' 'accept':110 'access':147 'actual':199,227 'address':136 'advertis':146 'ai/ml':67 'analyt':66 'api':63,140,165 'appear':94 'base':9,24,86,118,138 'behind':43 'beyond':219 'bodi':204 'broader':53 'call':62 'card':5,20,38,101,196 'card data endpoint' 'card transactions API' 'card-rel':100 'card-transact':4,19,37,195 'card-transactions' 'challeng':47,107 'charg':113 'confirm':108 'connect':174 'content':180 'data':65,70,230 'decim':128 'descript':191 'detail':218 'doc':164 'document':156 'dozen':57 'endpoint':7,22,32,90,198,214,235 'ethereum':135 'exampl':188 'expect':206 'expos':35 'extrem':161 'finance/web3':69 'financi':98 'function':228 'gate':3,18,149 'given':124 'i.e':122 'infer':68 'infrastructur':72 'key':141 'land':210 'limit':144 'list':91,212 'lowpaymentfee' 'lowpaymentfee.com':34 'mani':213 'micropay':154 'micropayment-gated' 'name':220 'network':87 'offer':56 'openapi':184 'page':169,211 'part':50 'pay':10,25,60,130 'pay-per-cal':59 'pay-per-call transactions' 'pay-per-request' 'payment':46 'per':12,27,61,78 'platform':54,208 'post':111,203 'post-method' 'price':75,166,222 'prompt':176 'protocol':155 'provid':216 'pure':150 'rate':143 'readm':168 'relat':102 'remain':236 'render':171 'request':13,28,79,112 'request/response':187 'resourc':40,104 'result':225 'return':200,231 'schema':185 'settl':81 'site':159 'span':64 'specif':89,234 'specifi':134 'substant':179 'thin':162 'transact':6,21,39,103,197 'unclear':237 'unit':119 'usdc':15,30,83,121,125 'usdc-base' 'util':73 'wallet':175 'x402':2,17,45,106,153 'x402 finance endpoint' 'x402-gated':1,16 'x402-payment'","prices":[{"id":"242d6163-d171-4d12-8cd5-68b59692f166","listingId":"2fd5e6a8-974c-4a28-9ecf-f906c837a2ba","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/95/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":"2026-04-18T18:43:58.243Z"}],"sources":[{"listingId":"2fd5e6a8-974c-4a28-9ecf-f906c837a2ba","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/95/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:58.243Z","lastSeenAt":"2026-04-24T16:02:33.886Z"}],"details":{"listingId":"2fd5e6a8-974c-4a28-9ecf-f906c837a2ba","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/95/transactions \\\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 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/95/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 Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/cards/95/transactions"}],"useCases":["Retrieving card transaction data via a single micropayment-gated POST call","Integrating card transaction lookups into agent workflows without API key management","Programmatic access to card-level transaction records settled on Base L2"],"bestFor":["Developers wanting keyless, pay-per-use card transaction data","AI agents that can settle x402 micropayments on Base","Prototyping financial data integrations without subscription commitments"],"notFor":["Production use cases requiring documented request/response schemas","High-volume batch processing where per-request pricing is inefficient","Users who need detailed API documentation before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.77Z"},"updatedAt":"2026-04-24T16:02:33.886Z"}}