{"id":"01f9b960-bfa7-4f6a-bbae-5609fe3cc247","shortId":"4dkjen","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 provides access to a card transactions resource at `/api/v1/cards/13/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 and settled in USDC on the Base network.\n\nThe specific endpoint listed here (`/api/v1/cards/13/transactions`) is labeled \"Premium API Access\" in the x402 challenge. The challenge confirms it accepts POST requests, charges a maximum of 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 entirely by 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 substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the card transactions endpoint actually returns or what parameters it accepts. The platform's landing page confirms the pricing model and lists other endpoints, but provides no technical detail about this specific resource. Prospective users should be aware that the actual functionality behind this endpoint is undocumented.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","card-transactions","pay-per-request","no-api-key"],"categories":["finance","payments"],"synonyms":["card transactions API","x402 API","USDC pay-per-call","Base network API","lowpaymentfee","micropayment API","402 payment 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 actual functionality of /api/v1/cards/13/transactions is unknown.","The endpoint path references a specific card ID (13), suggesting it may be a demo or placeholder resource.","Cannot verify what data is returned or what POST body is expected."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/13/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/13/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 USDC on Base), but there is zero documentation on what the endpoint does, what parameters it accepts, or what it returns. No OpenAPI schema, no examples, and all doc pages are empty. The listing is effectively a 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'0.02':10,24,77,121 '000':115 '20':114 '402 payment endpoint' '6':125 'Base network API' 'USDC pay-per-call' 'accept':107,199 'access':34,98,145 'actual':193,229 'address':134 'advertis':144 'ai/ml':67 'analyt':66 'api':62,97,138,160 'awar':226 'base':8,22,86,116,136 'base-network' 'behind':231 'broader':52 'call':61 'card':4,18,37,190 'card transactions API' 'card-transactions' 'challeng':102,104 'charg':110 'confirm':105,205 'connect':169 'content':175 'data':65,70 'decim':126 'descript':186 'detail':217 'doc':159 'document':154 'dozen':56 'endpoint':6,20,30,63,90,192,212,233 'entir':148 'ethereum':133 'exampl':183 'extrem':156 'finance/web3':69 'function':230 'gate':3,17,147 'given':122 'header':153 'i.e':120 'infer':68 'infrastructur':72 'key':139 'label':95 'land':203 'limit':142 'list':91,210 'lowpaymentfee' 'lowpaymentfee.com':32 'maximum':112 'micropayment API' 'model':208 'network':87 'no-api-key' 'offer':55 'openapi':179 'page':164,204 'paramet':197 'part':49 'pay':9,23,59,128 'pay-per-cal':58 'pay-per-request' 'payment':45,152 'per':11,25,60,78 'platform':53,201 'post':108 'premium':96 'price':75,161,207 'prompt':171 'prospect':222 'protocol':46 'provid':33,214 'rate':141 'readm':163 'render':166 'request':12,26,79,109 'request/response':182 'resourc':39,221 'return':194 'schema':180 'settl':81 'span':64 'spars':157 'specif':89,220 'specifi':132 'substant':174 'technic':216 'transact':5,19,38,191 'undocu':235 'unit':117 'usdc':14,28,83,119,123 'usdc-settlement' 'user':223 'util':73 'via':42 'wallet':170 'x402':2,16,44,101,151 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"8d3e7fe6-3c0c-4bb4-a9e5-0231a04540cd","listingId":"01f9b960-bfa7-4f6a-bbae-5609fe3cc247","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/13/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":"2026-04-18T18:43:16.499Z"}],"sources":[{"listingId":"01f9b960-bfa7-4f6a-bbae-5609fe3cc247","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/13/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:16.499Z","lastSeenAt":"2026-04-24T22:32:14.493Z"}],"details":{"listingId":"01f9b960-bfa7-4f6a-bbae-5609fe3cc247","quickStartSnippet":"# POST with x402 payment header (USDC on Base, $0.02 per call)\ncurl -X POST https://lowpaymentfee.com/api/v1/cards/13/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 HTTP 402 with an x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/13/transactions"},{"claim":"maxAmountRequired is 20000 base units of USDC (USD Coin, 6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/cards/13/transactions"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving card transaction data via a single paid API call","Integrating pay-per-request card data into agent workflows","Accessing financial transaction records without API key management"],"bestFor":["Agents or developers who want keyless, pay-per-call access to card transaction data","x402-compatible clients on the Base network","Low-volume or sporadic access patterns where per-request pricing is preferable to subscriptions"],"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 not set up to pay with USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:27.853Z"},"updatedAt":"2026-04-24T22:32:14.493Z"}}