{"id":"34b726de-2899-4857-bc00-8f23c2e9ac22","shortId":"F9Wbcb","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/46/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. The payment is settled on-chain to a specified wallet address using the \"exact\" scheme.\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-request APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no commitments required — payment is handled entirely via the x402 protocol on the Base L2 network.\n\nHowever, the specific endpoint being listed here (`/api/v1/cards/46/transactions`) is not documented on the site's landing page among the advertised APIs. Its purpose — likely related to card transaction data — can only be inferred from the URL path. No request/response schema, documentation, or examples are available for this particular endpoint. The docs, pricing, and API pages behind the site all appear to require a wallet connection and provide no additional content.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","card-transactions","post-endpoint"],"categories":["finance","payments"],"synonyms":["card transactions API","x402 USDC endpoint","pay-per-call API","Base network API","lowpaymentfee","card data endpoint","402 payment protocol"],"warnings":["The endpoint /api/v1/cards/46/transactions is not listed among the site's publicly advertised APIs — its purpose is inferred solely from the URL path.","No request body schema or response schema is available for this endpoint.","Documentation pages (docs, pricing, API, README) returned no useful content beyond a wallet-connect prompt.","The nature of 'card 46 transactions' is unclear — it could be test/demo data or a specific resource that may not persist."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/46/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/46/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 (returns a valid 402 x402 challenge), but there is no documentation, no request/response schema, and the specific card-transactions endpoint is not listed among the site's advertised APIs. The docs/pricing/API pages are empty beyond a wallet-connect prompt. Effectively a stub 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'0.02':65,132 '000':60 '20':59 '402':54 '402 payment protocol' 'Base network API' 'addit':227 'address':82 'advertis':91,178 'ai/ml':103 'among':176 'analysi':106 'analyt':102 'api':99,137,179,212 'appear':218 'avail':203 'base':9,24,61,69,156 'behind':42,214 'broader':88 'call':13,28,48 'card':5,20,37,185 'card data endpoint' 'card transactions API' 'card-transact':4,19 'card-transactions' 'chain':77 'challeng':55 'classif':108 'commit':144 'connect':223 'content':228 'convers':125 'data':101,111,187 'doc':209 'document':169,199 'embed':109 'endpoint':7,22,32,128,162,207 'entir':149 'estim':119 'exact':85 'exampl':201 'exchang':114 'expos':35 'feed':113 'finance/web3':110 'gas':118 'gate':3,18 'generat':126 'geocod':123 'handl':148 'howev':159 'infer':104,191 'infrastructur':121 'key':138 'l2':157 'land':174 'like':182 'limit':141 'list':130,164 'lowpaymentfee' 'lowpaymentfee.com':34,89 'network':70,158 'on-chain':75 'page':175,213 'particular':206 'path':195 'pay':11,26,96 'pay-per-cal':10,25 'pay-per-call API' 'pay-per-request':95 'payment':45,50,72,146 'per':12,27,97,133 'platform':90 'post-endpoint' 'price':112,210 'protocol':46,153 'provid':225 'purpos':181 'quot':117 'rate':115,140 'relat':183 'request':56,98,134 'request/response':197 'requir':145,220 'resourc':39 'return':52 'schema':198 'scheme':86 'sentiment':105 'settl':74 'site':172,216 'span':100 'specif':161 'specifi':80 'suit':93 'summar':107 'token':116 'transact':6,21,38,186 'unit':62 'url':194 'usd':66 'usdc':15,30,64 'usdc-base' 'use':83 'util':122 'valid':124 'via':150 'wallet':81,222 'without':49 'x402':2,17,44,152 'x402 USDC endpoint' 'x402-gated':1,16 'x402-payment'","prices":[{"id":"927b6315-ff5f-4a82-b74e-f05acf5f68c9","listingId":"34b726de-2899-4857-bc00-8f23c2e9ac22","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/46/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":"2026-04-18T18:43:36.987Z"}],"sources":[{"listingId":"34b726de-2899-4857-bc00-8f23c2e9ac22","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/46/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:36.987Z","lastSeenAt":"2026-04-24T18:32:22.499Z"}],"details":{"listingId":"34b726de-2899-4857-bc00-8f23c2e9ac22","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/46/transactions\n# Returns 402 with x402 challenge; attach X-PAYMENT header with valid USDC payment to proceed.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge requests up to 20,000 base units of USDC (asset 0x8335…) on Base network with the exact scheme.","source_url":"https://lowpaymentfee.com/api/v1/cards/46/transactions"},{"claim":"The site advertises all endpoints at $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories but does not list /api/v1/cards/46/transactions.","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving card transaction data via a single paid API call","Integrating pay-per-request card transaction lookups into agent workflows","Programmatic access to card-level transaction records without API key management"],"bestFor":["Agents or services needing on-demand card transaction data with crypto micropayments","Developers experimenting with x402 protocol integrations on Base","Use cases where no-signup, pay-per-call access is preferred"],"notFor":["Production workloads requiring documented request/response schemas and SLAs","Users who need fiat-only payment options (this endpoint requires USDC on Base)","High-volume batch processing where per-request pricing may not be economical"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.859Z"},"updatedAt":"2026-04-24T18:32:22.499Z"}}