{"id":"4e7e1597-f192-4ea7-a579-4394f93d019b","shortId":"ADEHF7","kind":"x402","title":"x402-gated card-transactions endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated card-transactions endpoint on Base, pay-per-call with USDC.","description":"This endpoint at lowpaymentfee.com exposes a card transactions resource at `/api/v1/cards/1/transactions` via the x402 payment protocol. It accepts POST requests and is gated behind a per-call USDC payment on the Base network. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335…), which with 6 decimals equals $0.02 per request. The provider describes it simply as \"Premium API Access.\"\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-request APIs spanning data analytics, AI/ML inference (sentiment, summarization, classification, embeddings), finance/crypto market data, and infrastructure utilities — all priced at $0.02 per call with no API keys, no rate limits, and no commitments. However, the specific `/api/v1/cards/1/transactions` endpoint is not listed among the publicly advertised APIs on the landing page, and no documentation, request schema, or response schema is available for it. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content.\n\nBecause there is no OpenAPI spec, no request/response examples, and no documentation beyond the endpoint title, it is unclear what data this endpoint returns or what input it expects. The endpoint is confirmed live (returns a valid x402 402 challenge), but its actual functionality remains opaque.","tags":[],"capabilities":["x402-payment","usdc-payment","base-network","card-transactions","pay-per-call","no-api-key"],"categories":["finance","payments"],"synonyms":["card transactions API","payment card data","transaction history","USDC pay-per-call","x402 API","lowpaymentfee"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","The /api/v1/cards/1/transactions endpoint is not listed among the provider's publicly advertised APIs.","No request or response schema is provided; it is unknown what input the endpoint expects or what it returns.","The endpoint name suggests financial card transaction data, which may fall under regulated financial data categories."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/1/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/1/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 no documentation, no request/response schema, no examples, and the specific endpoint is not even listed on the provider's own landing page. Functionality is entirely 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'0.02':85,128 '000':74 '0x8335':79 '20':73 '402':226 '6':82 'USDC pay-per-call' 'accept':48 'access':96 'actual':230 'advertis':101,152 'ai/ml':113 'among':149 'analyt':112 'api':95,109,133,153,172 'avail':167 'base':9,24,63,75 'base-network' 'behind':54 'beyond':200 'broader':98 'call':13,28,58,130 'card':5,20,37 'card transactions API' 'card-transact':4,19 'card-transactions' 'challeng':67,227 'classif':117 'commit':140 'confirm':220 'connect':181 'content':187 'cost':71 'data':111,121,208 'decim':83 'describ':90 'doc':171 'document':160,199 'embed':118 'endpoint':7,22,32,145,202,210,218 'equal':84 'exampl':196 'expect':216 'expos':35 'finance/crypto':119 'function':231 'gate':3,18,53 'howev':141 'indic':68 'infer':114 'infrastructur':123 'input':214 'key':134 'land':156 'limit':137 'list':148 'live':221 'lowpaymentfee' 'lowpaymentfee.com':34,99 'market':120 'maximum':70 'network':64 'no-api-key' 'opaqu':233 'openapi':192 'page':157,176 'pay':11,26,106 'pay-per-cal':10,25 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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/1/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":"2026-04-18T18:43:19.526Z"}],"sources":[{"listingId":"4e7e1597-f192-4ea7-a579-4394f93d019b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/1/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:19.526Z","lastSeenAt":"2026-04-24T21:03:01.381Z"}],"details":{"listingId":"4e7e1597-f192-4ea7-a579-4394f93d019b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/1/transactions\n# Returns 402 with x402 challenge; attach X-PAYMENT header with valid USDC payment on Base to access.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/1/transactions"},{"claim":"The provider advertises all APIs at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The /api/v1/cards/1/transactions endpoint is not listed among the publicly advertised APIs on the landing page","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving card transaction data on a per-call payment basis","Integrating card transaction lookups into agent workflows without API key management","Paying for financial data access with USDC on Base"],"bestFor":["Agents that need card transaction data and can pay with USDC on Base","Developers wanting keyless, pay-per-use financial API access","Prototyping x402 payment flows against a live endpoint"],"notFor":["Production use cases requiring documented request/response schemas","Users who need free or subscription-based access rather than per-call crypto payments","Anyone needing detailed API documentation before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:27.625Z"},"updatedAt":"2026-04-24T21:03:01.381Z"}}