{"id":"658e5136-cbb2-4121-ae50-ea5a701a9134","shortId":"4CpMAp","kind":"x402","title":"Pay-per-call card transaction API on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call card transaction API on Base via x402, settled in USDC at $0.02/request.","description":"This endpoint at lowpaymentfee.com exposes a card transactions resource at `/api/v1/cards/100/transactions` behind the x402 payment protocol. It accepts POST requests and requires an X-PAYMENT header carrying a valid x402 payment proof. The endpoint is live, returning a standard 402 challenge with an `exact` payment scheme on the Base network, settling in USDC (contract `0x8335…2913`) to the specified payTo address.\n\nThe maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD — consistent with the site-wide flat pricing of $0.02 per request. The provider advertises no API keys, no rate limits, and instant access. Payment timeout is 300 seconds.\n\nThe specific functionality of this particular endpoint (`/cards/100/transactions`) is not well-documented. The provider's landing page lists many API categories (data & analytics, AI/ML, finance, infrastructure) but does not explicitly list this cards/transactions path among them. The endpoint title is simply \"Premium API Access,\" which is the generic description embedded in the x402 challenge. Without further documentation or example responses, the exact data returned by this endpoint remains unclear — it likely returns transaction data associated with card ID 100, but this is inferred from the URL structure alone.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","post-endpoint","card-transactions","pay-per-request"],"categories":["finance","payments"],"synonyms":["card transactions API","x402 payment endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","card transaction data"],"warnings":["No documentation available for this specific endpoint — its exact functionality is unknown","The /cards/100/transactions path is not listed among the provider's advertised APIs on the landing page","No request body schema or response schema is documented","Docs, pricing, and API pages are empty (only show 'Connect wallet')","Endpoint purpose is inferred solely from URL structure"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/100/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/100/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 OpenAPI schema, no example request/response, and the specific functionality of the /cards/100/transactions path is not described anywhere on the site. The docs, pricing, and API pages all render only a 'Connect wallet' prompt with no useful 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'/cards/100/transactions':152 '/request':17,34 '0.02':16,33,114,125 '000':105 '0x8335':90 '100':224 '20':104 '2913':91 '300':143 '402':75 '6':110 'Base network API' 'USDC micropayment API' 'accept':52 'access':139,189 'address':96 'advertis':130 'ai/ml':169 'alon':233 'among':180 'amount':99 'analyt':168 'api':7,24,132,165,188 'associ':220 'base':9,26,84,106 'base-network' 'behind':46 'call':4,21,102 'card':5,22,41,222 'card transaction data' 'card transactions API' 'card-transactions' 'cards/transactions':178 'carri':62 'categori':166 'challeng':76,199 'consist':116 'contract':89 'data':167,208,219 'decim':111 'descript':194 'document':157,202 'embed':195 'endpoint':36,69,151,183,212 'equal':113 'exact':79,207 'exampl':204 'explicit':175 'expos':39 'financ':170 'flat':122 'function':147 'generic':193 'header':61 'id':223 'infer':228 'infrastructur':171 'instant':138 'key':133 'land':161 'like':216 'limit':136 'list':163,176 'live':71 'lowpaymentfee' 'lowpaymentfee.com':38 'mani':164 'maximum':98 'network':85 'page':162 'particular':150 'path':179 'pay':2,19 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request' 'payment':49,60,66,80,140 'payto':95 'per':3,20,101,126 'post':53 'post-endpoint' 'premium':187 'price':123 'proof':67 'protocol':50 'provid':129,159 'rate':135 'remain':213 'request':54,127 'requir':56,100 'resourc':43 'respons':205 'return':72,209,217 'scheme':81 'second':144 'settl':12,29,86 'simpli':186 'site':120 'site-wid':119 'specif':146 'specifi':94 'standard':74 'structur':232 'timeout':141 'titl':184 'transact':6,23,42,218 'unclear':214 'unit':107 'url':231 'usd':115 'usdc':14,31,88,109 'usdc-settlement' 'valid':64 'via':10,27 'well':156 'well-docu':155 'wide':121 'without':200 'x':59 'x-payment':58 'x402':11,28,48,65,198 'x402 payment endpoint' 'x402-payment'","prices":[{"id":"172c7f44-f6c1-4919-9bd4-4f939064e0ae","listingId":"658e5136-cbb2-4121-ae50-ea5a701a9134","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/100/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":"2026-04-18T18:43:18.300Z"}],"sources":[{"listingId":"658e5136-cbb2-4121-ae50-ea5a701a9134","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/100/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:18.300Z","lastSeenAt":"2026-04-24T21:31:50.442Z"}],"details":{"listingId":"658e5136-cbb2-4121-ae50-ea5a701a9134","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/100/transactions \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge requires 20,000 base units of USDC on Base network per call","source_url":"https://lowpaymentfee.com/api/v1/cards/100/transactions"},{"claim":"USDC contract address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/100/transactions"},{"claim":"Site-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The provider lists APIs across data/analytics, AI/ML, finance, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving transaction history for a specific card via a pay-per-call model","Integrating card transaction data into agent workflows without API key management","Programmatic access to financial card data settled on Base L2"],"bestFor":["Agents needing on-demand card transaction data without subscription commitments","Developers wanting x402-native payment integration on Base","Low-volume or sporadic access patterns where per-call pricing is economical"],"notFor":["High-volume bulk transaction data retrieval where per-call costs add up","Use cases requiring detailed API documentation and guaranteed SLAs","Users who cannot settle payments in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:27.725Z"},"updatedAt":"2026-04-24T21:31:50.442Z"}}