{"id":"322eaa29-a21e-47ad-bb40-46c998f85093","shortId":"G29ZJS","kind":"x402","title":"Pay-per-call card transaction API on Base network via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call card transaction API on Base network via x402, settled in USDC at $0.02/request.","description":"This endpoint at lowpaymentfee.com provides access to a card transactions resource (`/api/v1/cards/50/transactions`) via the x402 payment protocol. It accepts POST requests and charges $0.02 per call (20,000 base units of USDC on Base network, where USDC uses 6 decimals). Payment is settled on-chain to a specified wallet address using the \"exact\" scheme.\n\nThe provider operates a broader platform offering multiple API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities — all priced uniformly at $0.02 per request. The platform advertises no API keys, no rate limits, and instant access. However, documentation for this specific endpoint is extremely sparse: the crawled docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no further technical detail.\n\nThe specific functionality of the `/api/v1/cards/50/transactions` endpoint is unclear from available materials. The path suggests it retrieves or creates transactions associated with card ID 50, but no request/response schema, field definitions, or usage examples are documented. The endpoint is confirmed live (returns a valid 402 challenge), but users should expect to experiment or contact the provider for integration details.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","card-transactions","post-method"],"categories":["finance","payments"],"synonyms":["card transactions API","x402 payment endpoint","USDC micropayment API","Base network API","pay-per-request API","lowpaymentfee"],"warnings":["No request or response schema documented anywhere","The specific purpose of /api/v1/cards/50/transactions is unclear — path suggests card-specific data but no details available","All documentation pages (docs, api, pricing, README) returned only 'Connect wallet' with no content","The card ID '50' is hardcoded in the path — unclear if this is a demo or a real resource"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/50/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/50/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 of request parameters, response schema, or what 'cards/50/transactions' actually returns. The crawled pages beyond the landing page are all empty wallet-connect prompts. This is effectively a stub 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'/request':18,36 '0.02':17,35,60,117 '000':64 '20':63 '402':205 '50':185 '6':75 'Base network API' 'USDC micropayment API' 'accept':55 'access':42,131 'address':87 'advertis':122 'ai':105 'analyt':104 'api':7,25,100,124,144 'associ':181 'avail':171 'base':9,27,65,70 'base-network' 'broader':96 'call':4,22,62 'card':5,23,45,183 'card transactions API' 'card-transactions' 'categori':101 'chain':82 'challeng':206 'charg':59 'confirm':200 'connect':153 'contact':214 'crawl':142 'creat':179 'data':103 'decim':76 'definit':191 'detail':160,219 'doc':143 'document':133,196 'endpoint':38,137,167,198 'exact':90 'exampl':194 'expect':210 'experi':212 'extrem':139 'field':190 'financ':108 'function':163 'howev':132 'id':184 'includ':102 'infrastructur':111 'instant':130 'integr':218 'key':125 'learn':107 'limit':128 'live':201 'lowpaymentfee' 'lowpaymentfee.com':40 'machin':106 'materi':172 'multipl':99 'network':10,28,71 'offer':98 'on-chain':80 'oper':94 'page':148 'path':174 'pay':2,20 'pay-per-cal':1,19 'pay-per-call' 'pay-per-request API' 'payment':52,77 'per':3,21,61,118 'platform':97,121 'post':56 'post-method' 'price':114,145 'prompt':155 'protocol':53 'provid':41,93,216 'rate':127 'readm':147 'request':57,119 'request/response':188 'resourc':47 'retriev':177 'return':150,202 'schema':189 'scheme':91 'settl':13,31,79 'spars':140 'specif':136,162 'specifi':85 'suggest':175 'technic':159 'transact':6,24,46,180 'unclear':169 'uniform':115 'unit':66 'usag':193 'usdc':15,33,68,73 'usdc-settlement' 'use':74,88 'user':208 'util':112 'valid':204 'via':11,29,49 'wallet':86,154 'web3':109 'x402':12,30,51 'x402 payment endpoint' 'x402-payment'","prices":[{"id":"42ea15a7-3499-4988-aeb9-d3b937fdd00c","listingId":"322eaa29-a21e-47ad-bb40-46c998f85093","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/50/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":"2026-04-18T18:43:35.815Z"}],"sources":[{"listingId":"322eaa29-a21e-47ad-bb40-46c998f85093","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/50/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:35.815Z","lastSeenAt":"2026-04-24T20:02:27.812Z"}],"details":{"listingId":"322eaa29-a21e-47ad-bb40-46c998f85093","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/50/transactions \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/50/transactions"},{"claim":"Platform charges $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/cards/50/transactions"}],"useCases":["Retrieving or creating transactions for a specific card via programmatic access","Integrating card transaction data into automated agent workflows","Demonstrating x402 protocol payment flows on Base network"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing pay-per-call card transaction access without API keys","Projects already operating on Base network with USDC"],"notFor":["Production use cases requiring documented request/response schemas","High-volume batch processing where per-call pricing is inefficient","Users who need detailed API documentation before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.806Z"},"updatedAt":"2026-04-24T20:02:27.812Z"}}