{"id":"c9162c40-96f8-40e0-ae5d-626a4cd6d5b8","shortId":"QZgZaj","kind":"x402","title":"x402-payable card transaction endpoint on Base, settling in USDC at $0.02 per request.","tagline":"x402-payable card transaction endpoint on Base, settling in USDC at $0.02 per request.","description":"This endpoint at lowpaymentfee.com provides a POST-based card transactions API accessible via the x402 payment protocol. It is part of a broader platform offering dozens of pay-per-call endpoints 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 `/api/v1/cards/19/transactions` is listed under the title \"Premium API Access.\" The x402 challenge confirms it is live, accepting exact-scheme payments of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payments are sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. No API keys or rate limits are advertised; access is granted purely through the x402 payment header.\n\nDocumentation 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/19/transactions\" resource actually returns or expects as input. The endpoint's purpose — whether it retrieves transaction history for a specific card, creates a transaction, or something else — cannot be determined from the available material. Prospective users should test with caution.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","post-endpoint","pay-per-call","no-api-key","card-transactions"],"categories":["finance","payments"],"synonyms":["card transactions API","x402 endpoint","USDC micropayment API","Base network API","pay-per-request API","lowpaymentfee","402 payment protocol"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or request/response schema provided; input and output formats are unknown","The purpose of '/api/v1/cards/19/transactions' is unclear — it could be transaction history, creation, or something else","The hardcoded card ID '19' in the path suggests this may be a demo or placeholder endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/19/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/19/transactions","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 there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the endpoint actually does. The listing title 'Premium API Access' is generic and uninformative. Effectively a 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'0.02':13,28,77,127 '000':116 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':138 '0x8335':121 '20':115 '2913':122 '300':141 '402 payment protocol' '6':131 'Base network API' 'USDC micropayment API' 'accept':107 'access':43,99,152 'actual':199 'address':137 'advertis':151 'ai/ml':67 'analyt':66 'api':42,98,145,167 'avail':229 'base':8,23,39,86,117,124 'base-network' 'broader':54 'call':62 'cannot':224 'card':4,19,40,217 'card transactions API' 'card-transactions' 'cards/19/transactions':197 'caution':236 'challeng':102 'confirm':103 'connect':176 'content':182 'creat':218 'data':65,70 'decim':132 'descript':193 'determin':226 'doc':166 'document':161 'dozen':57 'els':223 'endpoint':6,21,32,63,90,206 'equal':126 'exact':109 'exact-schem':108 'exampl':190 'expect':202 'extrem':163 'finance/web3':69 'given':128 'grant':154 'header':160 'histori':213 'infer':68 'infrastructur':72 'input':204 'key':146 'limit':149 'list':93 'live':106 'lowpaymentfee' 'lowpaymentfee.com':34 'materi':230 'network':87 'no-api-key' 'offer':56 'openapi':186 'page':171 'part':51 'pay':60 'pay-per-cal':59 'pay-per-call' 'pay-per-request API' 'payabl':3,18 'payment':47,111,133,159 'per':14,29,61,78 'platform':55 'post':38 'post-bas':37 'post-endpoint' 'premium':97 'price':75,168 'prompt':178 'prospect':231 'protocol':48 'provid':35 'pure':155 'purpos':208 'rate':148 'readm':170 'render':173 'request':15,30,79 'request/response':189 'resourc':198 'retriev':211 'return':200 'schema':187 'scheme':110 'second':142 'sent':135 'settl':9,24,81 'someth':222 'span':64 'spars':164 'specif':89,216 'test':234 'timeout':143 'titl':96 'transact':5,20,41,212,220 'unit':118 'usdc':11,26,83,120,129 'usdc-settlement' 'user':232 'util':73 'via':44 'wallet':177 'whether':209 'x402':2,17,46,101,158 'x402 endpoint' 'x402-payable':1,16 'x402-payment'","prices":[{"id":"6278b005-9058-4ce7-9e41-f67e1b1279a8","listingId":"c9162c40-96f8-40e0-ae5d-626a4cd6d5b8","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/19/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":"2026-04-18T18:43:23.170Z"}],"sources":[{"listingId":"c9162c40-96f8-40e0-ae5d-626a4cd6d5b8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/19/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:23.170Z","lastSeenAt":"2026-04-24T21:31:50.599Z"}],"details":{"listingId":"c9162c40-96f8-40e0-ae5d-626a4cd6d5b8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/19/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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/19/transactions"},{"claim":"All endpoints 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/19/transactions"}],"useCases":["Querying or creating card transaction records via a single paid POST call","Integrating pay-per-call card data into agent workflows without API key management","Programmatic access to card transaction data settled on-chain via USDC"],"bestFor":["Developers wanting keyless, pay-per-call access to card transaction data","AI agents that can settle x402 payments in USDC on Base","Projects needing low-cost per-request pricing without subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume batch processing where per-request fees add up quickly","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:27.476Z"},"updatedAt":"2026-04-24T21:31:50.599Z"}}