{"id":"5dcce94d-ca8a-452a-bb68-2e403f3ce5fb","shortId":"F9EAEr","kind":"x402","title":"x402-gated card transaction endpoint on Base, paying $0.02 per request in USDC.","tagline":"x402-gated card transaction endpoint on Base, paying $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides access to a card transactions resource at `/api/v1/cards/44/transactions` via the x402 payment protocol. It is part of a broader platform that offers dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request settled in USDC on the Base network.\n\nThe specific endpoint listed here accepts POST requests and is gated by an x402 challenge requiring a maximum of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call. Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base. No API keys or rate limits are advertised; access is instant once payment is included in the `X-PAYMENT` header.\n\nDocumentation on the site is extremely sparse — the docs, API, pricing, and README pages all render 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/44/transactions` resource actually returns or what input it expects. The endpoint name suggests card transaction data (possibly payment-card or gift-card related), but this is speculative. The platform's landing page confirms the pricing model and lists many other endpoints, but provides no technical detail for any of them.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","card-transactions","post-method"],"categories":["finance","payments"],"synonyms":["card transactions API","x402 API","USDC pay-per-call","lowpaymentfee","Base network API","micropayment API","card data endpoint"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","No OpenAPI or request/response schema provided; the purpose of /api/v1/cards/44/transactions is unclear.","The hardcoded card ID '44' in the URL path is unexplained — it is unknown whether other card IDs are supported or what they represent.","Cannot verify what data this endpoint returns or what POST body it expects."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/44/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/44/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 and returns a valid x402 challenge, confirming pricing and payment details. However, there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the endpoint actually does. The docs pages are empty. This is effectively a stub 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'/cards/44/transactions':194 '0.02':10,24,77,112 '000':107 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':126 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':131 '20':106 '6':117 'Base network API' 'USDC pay-per-call' 'accept':92 'access':34,142 'actual':196 'address':125 'advertis':141 'ai/ml':67 'analyt':66 'api':62,135,164 'base':8,22,85,108,133 'base-network' 'broader':52 'call':61,120 'card':4,18,37,207,213,217 'card data endpoint' 'card transactions API' 'card-transactions' 'challeng':101 'confirm':228 'connect':173 'content':179 'contract':130 'data':65,70,209 'decim':118 'descript':190 'detail':241 'doc':163 'document':155 'dozen':56 'endpoint':6,20,30,63,89,204,236 'exampl':187 'expect':202 'extrem':160 'finance/web3':69 'gate':3,17,97 'gift':216 'gift-card':215 'header':154 'includ':148 'infer':68 'infrastructur':72 'input':200 'instant':144 'key':136 'land':226 'limit':139 'list':90,233 'lowpaymentfee' 'lowpaymentfee.com':32 'made':123 'mani':234 'maximum':104 'micropayment API' 'model':231 'name':205 'network':86 'offer':55 'openapi':183 'page':168,227 'part':49 'pay':9,23,59 'pay-per-cal':58 'pay-per-request' 'payment':45,121,146,153,212 'payment-card':211 'per':11,25,60,78,119 'platform':53,224 'possibl':210 'post':93 'post-method' 'price':75,165,230 'prompt':175 'protocol':46 'provid':33,238 'rate':138 'readm':167 'relat':218 'render':170 'request':12,26,79,94 'request/response':186 'requir':102 'resourc':39,195 'return':197 'schema':184 'settl':80 'sinc':114 'site':158 'span':64 'spars':161 'specif':88 'specul':222 'suggest':206 'technic':240 'transact':5,19,38,208 'unit':109 'usd':113 'usdc':14,28,82,111,115,129 'usdc-settlement' 'use':116,127 'util':73 'via':42 'wallet':174 'x':152 'x-payment':151 'x402':2,16,44,100 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"03605b18-6783-4439-8561-abaf8f5c4c15","listingId":"5dcce94d-ca8a-452a-bb68-2e403f3ce5fb","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/44/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":"2026-04-18T18:43:34.006Z"}],"sources":[{"listingId":"5dcce94d-ca8a-452a-bb68-2e403f3ce5fb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/44/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:34.006Z","lastSeenAt":"2026-04-24T20:02:27.687Z"}],"details":{"listingId":"5dcce94d-ca8a-452a-bb68-2e403f3ce5fb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/44/transactions \\\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 of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/44/transactions"},{"claim":"All endpoints 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":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/cards/44/transactions"}],"useCases":["Retrieving card transaction data on a per-call payment basis without API keys","Integrating card transaction lookups into agent workflows that settle via x402/USDC on Base","Programmatic access to transaction records for card ID 44"],"bestFor":["Developers wanting keyless, pay-per-use API access settled in USDC on Base","AI agents that can autonomously pay for API calls via x402","Users who need occasional card transaction data without subscription commitments"],"notFor":["Users who need detailed API documentation or request/response schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.954Z"},"updatedAt":"2026-04-24T20:02:27.687Z"}}