{"id":"d4c3e924-72fd-4348-824d-d7a4d3283a7f","shortId":"XWrYR9","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 card-transactions resource at `/api/v1/cards/75/transactions` behind the x402 payment protocol. It accepts POST requests and requires an X-PAYMENT header carrying a USDC payment on the Base network. The x402 challenge advertises a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The endpoint is described generically as \"Premium API Access\" with no further documentation on the request body schema or response format.\n\nThe provider, lowpaymentfee.com, hosts a broader catalog of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per call with no API keys, no rate limits, and no minimum commitments. However, the specific `/api/v1/cards/75/transactions` endpoint is not listed on the provider's landing page among the advertised APIs, and no dedicated documentation, request/response examples, or OpenAPI schema were found during crawling. The docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no additional content.\n\nBecause the endpoint's actual functionality is unclear — the path suggests card transaction data but no schema or sample payloads are available — agents should treat this as a low-documentation endpoint. The x402 challenge is live and well-formed, confirming the endpoint is operational and accepts payments, but what it returns after payment remains unverified.","tags":[],"capabilities":["x402-payment","usdc-base","card-transactions","post-endpoint","pay-per-request"],"categories":["finance","payments"],"synonyms":["card transactions API","x402 USDC endpoint","lowpaymentfee","Base network API","pay-per-call API","card data endpoint","402 payment API"],"warnings":["No request body schema or response schema available — actual functionality is unknown","Endpoint path /api/v1/cards/75/transactions is not listed among the provider's advertised APIs","All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no content","The hardcoded card ID '75' in the path suggests this may be a specific resource rather than a general-purpose API"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/75/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/75/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint is operational. However, there is no OpenAPI schema, no request/response examples, no documentation beyond a generic title, and the specific endpoint is not even listed on the provider's own landing page. Effectively a 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'0.02':11,26,87,140 '000':76 '0x8335':81 '20':75 '2913':82 '402 payment API' '6':92 'Base network API' 'accept':49,249 'access':102 'actual':206 'addit':200 'advertis':70,170 'agent':224 'ai/ml':130 'among':168 'amount':73 'analyt':129 'api':101,126,145,171,189 'avail':223 'base':9,24,65,77,84 'behind':43 'bodi':110 'broader':120 'call':142 'card':5,20,38,213 'card data endpoint' 'card transactions API' 'card-transact':4,19,37 'card-transactions' 'carri':59 'catalog':121 'challeng':69,236 'commit':153 'confirm':243 'connect':195 'content':201 'crawl':184 'data':128,133,215 'decim':93 'dedic':174 'describ':97 'doc':186 'document':106,175,232 'endpoint':7,22,32,95,158,204,233,245 'equal':86 'exampl':177 'expos':35 'finance/web3':132 'form':242 'format':114 'found':182 'function':207 'gate':3,18,125 'generic':98 'header':58 'host':118 'howev':154 'infer':131 'infrastructur':135 'key':146 'land':166 'limit':149 'list':161 'live':238 'low':231 'low-document':230 'lowpaymentfee' 'lowpaymentfee.com':34,117 'maximum':72 'minimum':152 'network':66 'openapi':179 'oper':247 'page':167,190 'path':211 'pay':10,25 'pay-per-call API' 'pay-per-request' 'payload':221 'payment':46,57,62,250,256 'per':12,27,88,141 'post':50 'post-endpoint' 'premium':100 'price':138,187 'prompt':197 'protocol':47 'provid':116,164 'rate':148 'remain':257 'request':13,28,51,89,109 'request/response':176 'requir':53 'resourc':40 'respons':113 'return':192,254 'sampl':220 'schema':111,180,218 'span':127 'specif':156 'suggest':212 'transact':6,21,39,214 'treat':226 'unclear':209 'unit':78 'unverifi':258 'usdc':15,30,61,80,90 'usdc-base' 'use':91 'util':136 'wallet':196 'well':241 'well-form':240 'x':56 'x-payment':55 'x402':2,17,45,68,124,235 'x402 USDC endpoint' 'x402-gated':1,16,123 'x402-payment'","prices":[{"id":"fdd16874-9b17-4d9d-9d7f-50d78b689637","listingId":"d4c3e924-72fd-4348-824d-d7a4d3283a7f","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/75/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":"2026-04-18T18:43:50.926Z"}],"sources":[{"listingId":"d4c3e924-72fd-4348-824d-d7a4d3283a7f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/75/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:50.926Z","lastSeenAt":"2026-04-24T17:02:22.683Z"}],"details":{"listingId":"d4c3e924-72fd-4348-824d-d7a4d3283a7f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/75/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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/75/transactions"},{"claim":"Provider advertises $0.02 per request across all APIs with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/75/transactions"},{"claim":"Docs, pricing, API, and README pages returned only 'Connect wallet' with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving card transaction data via a pay-per-request model","Programmatic access to card-level transaction records without API key management","Agent-driven financial data retrieval settled in USDC on Base"],"bestFor":["Agents that can settle x402 payments in USDC on Base","Use cases needing keyless, per-call access to card transaction data","Developers exploring x402 protocol integrations"],"notFor":["Users who need detailed API documentation or guaranteed response schemas before integrating","High-volume batch processing where per-call pricing may add up","Anyone unable to transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.136Z"},"updatedAt":"2026-04-24T17:02:22.683Z"}}