{"id":"622b567e-40ef-4d15-a226-098851628229","shortId":"h7yPnc","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 POST-based card transactions API at `/api/v1/cards/25/transactions`. It is part of a broader platform offering dozens of x402-gated 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 (`/api/v1/cards/25/transactions`) is labeled \"Premium API Access\" but its exact functionality is unclear from the available documentation. The path suggests it may relate to retrieving or creating transactions for a specific card (ID 25), but no request/response schema or detailed docs were found. The platform's crawled docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no further content.\n\nPayment is handled via the x402 protocol: callers receive a 402 challenge specifying USDC (contract `0x8335…2913`) on Base with a `maxAmountRequired` of 20000 base units, which equals $0.02 (USDC uses 6 decimals). The scheme is \"exact\", meaning the full amount is paid per request. No API keys or rate limits are advertised. The endpoint is live and responding with a valid x402 challenge.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","card-transactions","post-api","pay-per-request"],"categories":["finance","payments"],"synonyms":["card transactions API","payment processing","x402 endpoint","USDC micropayment","Base network API","lowpaymentfee","card data endpoint"],"warnings":["No request or response schema available — the endpoint's exact functionality is unknown.","All documentation pages (docs, pricing, README, api) returned only 'Connect wallet' with no useful content.","The path '/api/v1/cards/25/transactions' with a hardcoded card ID (25) is unusual and unexplained.","The 'Premium API Access' label is generic and does not describe the endpoint's purpose.","This endpoint is not listed among the platform's advertised APIs on the homepage."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/25/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/25/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 request/response schema, and no explanation of what the card transactions endpoint actually does. The docs, pricing, and README pages are all blank beyond a wallet-connect prompt. This is effectively a stub 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'0.02':11,26,72,177 '0x8335':164 '20000':172 '25':119 '2913':165 '402':159 '6':180 'Base network API' 'USDC micropayment' 'access':92 'advertis':201 'ai/ml':62 'amount':189 'analyt':61 'api':42,91,195 'avail':101 'base':9,24,39,80,167,173 'base-network' 'broader':50 'caller':156 'card':5,20,40,117 'card data endpoint' 'card transactions API' 'card-transact':4,19 'card-transactions' 'challeng':160,212 'connect':142 'content':148 'contract':163 'crawl':132 'creat':112 'data':60,65 'decim':181 'detail':125 'doc':126,133 'document':102 'dozen':53 'endpoint':7,22,32,58,84,203 'equal':176 'exact':95,185 'expos':35 'finance/web3':64 'found':128 'full':188 'function':96 'gate':3,18,57 'handl':151 'id':118 'infer':63 'infrastructur':67 'key':196 'label':89 'limit':199 'list':85 'live':205 'lowpaymentfee' 'lowpaymentfee.com':34 'maxamountrequir':170 'may':107 'mean':186 'network':81 'offer':52 'page':137 'paid':191 'part':47 'path':104 'pay':10,25 'pay-per-request' 'payment':149 'payment processing' 'per':12,27,73,192 'platform':51,130 'post':38 'post-api' 'post-bas':37 'premium':90 'price':70,134 'prompt':144 'protocol':155 'rate':198 'readm':136 'receiv':157 'relat':108 'request':13,28,74,193 'request/response':122 'respond':207 'retriev':110 'return':139 'schema':123 'scheme':183 'settl':75 'span':59 'specif':83,116 'specifi':161 'suggest':105 'transact':6,21,41,113 'unclear':98 'unit':174 'usdc':15,30,77,162,178 'usdc-settlement' 'use':179 'util':68 'valid':210 'via':152 'wallet':143 'x402':2,17,56,154,211 'x402 endpoint' 'x402-gated':1,16,55 'x402-payment'","prices":[{"id":"f7aa70c1-929d-406a-8af5-3d2993fe503f","listingId":"622b567e-40ef-4d15-a226-098851628229","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/25/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":"2026-04-18T18:43:24.383Z"}],"sources":[{"listingId":"622b567e-40ef-4d15-a226-098851628229","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/25/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:24.383Z","lastSeenAt":"2026-04-24T21:31:50.702Z"}],"details":{"listingId":"622b567e-40ef-4d15-a226-098851628229","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/25/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 valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/25/transactions"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/25/transactions"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying or creating card transaction records via a pay-per-call model","Integrating card transaction data into automated agent workflows without API key management","Testing x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers exploring x402 protocol-based API access","Agents needing keyless, pay-per-request card transaction data","Low-volume or sporadic API consumers who want no subscription commitment"],"notFor":["High-volume production workloads requiring documented SLAs and detailed schemas","Users who need comprehensive card processing features (issuing, disputes, chargebacks)","Anyone requiring fiat-only payment rails with no crypto involvement"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:27.412Z"},"updatedAt":"2026-04-24T21:31:50.702Z"}}