{"id":"f53dd489-8452-492a-973e-5fc91a489e6e","shortId":"bHdHnJ","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/18/transactions` behind the x402 payment protocol. When called without payment, it returns a 402 challenge requesting USDC on the Base network. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 per request. Payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the \"exact\" scheme, and the endpoint accepts POST requests.\n\nThe broader lowpaymentfee.com platform advertises a wide catalog of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments. However, the specific endpoint listed here (`/api/v1/cards/18/transactions`) is labeled \"Premium API Access\" and does not appear in the publicly listed catalog on the homepage. Its exact functionality — what data it returns or what action it performs on \"card 18 transactions\" — is not documented in any crawled page.\n\nBecause the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no additional content, there is no schema documentation, request/response examples, or detailed description available for this endpoint. The endpoint is confirmed live (402 challenge captured), but its purpose and output format remain unclear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","post-endpoint","card-transactions"],"categories":["finance","payments"],"synonyms":["card transactions API","x402 USDC endpoint","pay-per-request API","Base network API","lowpaymentfee","402 payment API","card data endpoint"],"warnings":["No API documentation available — all doc pages render only a 'Connect wallet' prompt","The endpoint /api/v1/cards/18/transactions is not listed in the site's public API catalog; its purpose is undocumented","No request or response schema is available; integration requires trial-and-error","The 'cards/18/transactions' path suggests financial data — verify regulatory compliance before use"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/18/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/18/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, but there is zero documentation on what the endpoint actually does, what request body it expects, or what it returns. The docs pages are empty (wallet-connect only). The endpoint path does not appear in the site's public catalog, making its purpose 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'0.02':79,124 '000':70 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':87 '18':176 '20':69 '402':54,223 '402 payment API' '6':75 'Base network API' 'accept':95 'access':149 'action':171 'addit':202 'address':86 'advertis':102 'ai/ml':114 'amount':64 'analyt':113 'api':110,129,148,189 'appear':153 'avail':214 'base':9,24,60,71 'behind':42 'broader':99 'call':13,28,48,67 'captur':225 'card':5,20,37,175 'card data endpoint' 'card transactions API' 'card-transact':4,19 'card-transactions' 'catalog':105,158 'challeng':55,224 'commit':137 'confirm':221 'connect':197 'content':203 'crawl':183 'data':112,117,166 'decim':76 'descript':213 'detail':212 'doc':187 'document':180,208 'endpoint':7,22,32,94,141,217,219 'equal':78 'exact':90,163 'exampl':210 'expos':35 'finance/web3':116 'format':231 'function':164 'gate':3,18,109 'homepag':161 'howev':138 'infer':115 'infrastructur':119 'key':130 'label':146 'limit':133 'list':142,157 'live':222 'lowpaymentfee' 'lowpaymentfee.com':34,100 'maximum':63 'minimum':136 'network':61 'output':230 'page':184,192 'pay':11,26 'pay-per-cal':10,25 'pay-per-call' 'pay-per-request API' 'payment':45,50,82 'per':12,27,66,80,125 'perform':173 'platform':101 'post':96 'post-endpoint' 'premium':147 'price':122,188 'prompt':199 'protocol':46 'public':156 'purpos':228 'rate':132 'readm':191 'remain':232 'render':194 'request':56,81,97,126 'request/response':209 'requir':65 'resourc':39 'return':52,168 'schema':207 'scheme':91 'sent':84 'span':111 'specif':140 'transact':6,21,38,177 'unclear':233 'unit':72 'usdc':15,30,57,74 'usdc-base' 'use':88 'util':120 'wallet':198 'wide':104 'without':49 'x402':2,17,44,108 'x402 USDC endpoint' 'x402-gated':1,16,107 'x402-payment'","prices":[{"id":"3d330a18-6125-4b00-bb28-66ca4be8a3bf","listingId":"f53dd489-8452-492a-973e-5fc91a489e6e","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/18/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":"2026-04-18T18:43:20.756Z"}],"sources":[{"listingId":"f53dd489-8452-492a-973e-5fc91a489e6e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/18/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:20.756Z","lastSeenAt":"2026-04-24T21:31:50.553Z"}],"details":{"listingId":"f53dd489-8452-492a-973e-5fc91a489e6e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/18/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 x402 challenge requires maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/18/transactions"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/cards/18/transactions"},{"claim":"All listed 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"},{"claim":"Docs, pricing, API, and README pages render only a 'Connect wallet' prompt with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving or submitting card transaction data via a single paid API call","Integrating pay-per-use card transaction lookups into agent workflows","Programmatic access to card-level transaction records without API key management"],"bestFor":["Agents or services that need on-demand card transaction data with no subscription","Developers experimenting with x402 payment-gated APIs on Base","Use cases requiring keyless, pay-as-you-go API access"],"notFor":["Users who need detailed API documentation or guaranteed SLA before integrating","High-volume batch processing where per-call pricing at $0.02 adds up quickly","Anyone needing non-USDC or non-Base-network payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:27.597Z"},"updatedAt":"2026-04-24T21:31:50.553Z"}}