{"id":"7512d9b0-f2ed-47ea-abf6-ee574f16caf7","shortId":"wbCMy9","kind":"x402","title":"x402-gated card-transaction endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated card-transaction endpoint on Base, pay-per-call with USDC.","description":"This endpoint at lowpaymentfee.com exposes a card transactions resource at `/api/v1/cards/62/transactions` behind the x402 payment protocol. When called without payment, it returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD) on the Base network. Payment is settled on-chain to the specified wallet address using the \"exact\" scheme.\n\nThe parent site lowpaymentfee.com advertises a broad catalog of pay-per-request APIs spanning data analytics, AI/ML inference (sentiment, summarization, classification, embeddings), finance/crypto market data, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and no commitments. However, the specific endpoint being listed here (`/api/v1/cards/62/transactions`) is not prominently documented on the site's landing page, and its exact input/output schema is not published. The endpoint accepts HTTP POST and returns `application/json`.\n\nBecause there is no OpenAPI spec, no request/response examples, and no dedicated documentation for this particular resource, the actual functionality behind \"card 62 transactions\" is unclear. It may relate to the finance category or could be a generic placeholder. The crawled docs, pricing, API, and README pages all rendered only a wallet-connect prompt with no additional content. Prospective callers should treat this as a minimally documented endpoint until further details surface.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","http-post","json-response","card-transactions"],"categories":["finance","payments"],"synonyms":["card transactions API","x402 endpoint","USDC micropayment API","lowpaymentfee","pay-per-call API","Base network API","card 62 transactions"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The specific resource /api/v1/cards/62/transactions is not listed on the provider's landing page catalog","All documentation pages (docs, api, pricing, README) returned only a wallet-connect prompt with no content","Input and output schemas are unknown — callers cannot determine what request body to send or what response to expect"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/62/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/62/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 no OpenAPI spec, no request/response schema, no documentation for this specific resource, and the crawled doc pages are empty. Effectively a stub 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'0.02':65,118 '000':60 '20':59 '402':54 '62':187 'Base network API' 'USDC micropayment API' 'accept':159 'actual':183 'addit':222 'address':81 'advertis':90 'ai/ml':103 'analyt':102 'api':99,123,208 'application/json':164 'base':9,24,61,69 'behind':42,185 'broad':92 'call':13,28,48 'caller':225 'card':5,20,37,186 'card 62 transactions' 'card transactions API' 'card-transact':4,19 'card-transactions' 'catalog':93 'categori':197 'chain':76 'challeng':55 'classif':107 'commit':130 'connect':218 'content':223 'could':199 'crawl':205 'data':101,111 'dedic':176 'detail':236 'doc':206 'document':142,177,232 'embed':108 'endpoint':7,22,32,134,158,233 'exact':84,151 'exampl':173 'expos':35 'financ':196 'finance/crypto':109 'function':184 'gate':3,18 'generic':202 'howev':131 'http':160 'http-post' 'infer':104 'infrastructur':113 'input/output':152 'json-response' 'key':124 'land':147 'limit':127 'list':136 'lowpaymentfee' 'lowpaymentfee.com':34,89 'market':110 'may':192 'minim':231 'network':70 'on-chain':74 'openapi':169 'page':148,211 'parent':87 'particular':180 'pay':11,26,96 'pay-per-cal':10,25 'pay-per-call API' 'pay-per-request':95 'payment':45,50,71 'per':12,27,97,119 'placehold':203 'post':161 'price':116,207 'promin':141 'prompt':219 'prospect':224 'protocol':46 'publish':156 'rate':126 'readm':210 'relat':193 'render':213 'request':56,98,120 'request/response':172 'resourc':39,181 'return':52,163 'schema':153 'scheme':85 'sentiment':105 'settl':73 'site':88,145 'span':100 'spec':170 'specif':133 'specifi':79 'summar':106 'surfac':237 'transact':6,21,38,188 'treat':227 'unclear':190 'unit':62 'usd':66 'usdc':15,30,64 'usdc-base' 'use':82 'util':114 'wallet':80,217 'wallet-connect':216 'without':49 'x402':2,17,44 'x402 endpoint' 'x402-gated':1,16 'x402-payment'","prices":[{"id":"8e5c55b9-5c1f-47af-a846-2758f0659f7a","listingId":"7512d9b0-f2ed-47ea-abf6-ee574f16caf7","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/62/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":"2026-04-18T18:43:40.022Z"}],"sources":[{"listingId":"7512d9b0-f2ed-47ea-abf6-ee574f16caf7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/62/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:40.022Z","lastSeenAt":"2026-04-24T18:32:22.784Z"}],"details":{"listingId":"7512d9b0-f2ed-47ea-abf6-ee574f16caf7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/62/transactions\n# Returns 402 with x402 challenge; attach X-PAYMENT header with signed USDC payment to access.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/62/transactions"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/cards/62/transactions"},{"claim":"All APIs priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving transaction records for a specific card via a single paid API call","Programmatic access to card transaction data without API key registration","Agent-driven financial data retrieval with on-chain USDC settlement"],"bestFor":["Developers wanting keyless, pay-per-use card transaction data","AI agents that can settle x402 USDC payments on Base","Prototyping micropayment-gated financial APIs"],"notFor":["Users needing well-documented, schema-validated endpoints","High-volume batch transaction queries where per-call pricing is inefficient","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.595Z"},"updatedAt":"2026-04-24T18:32:22.784Z"}}