{"id":"2f2f80f0-08ba-426f-8f4e-ac63c0c246f3","shortId":"UFSc4e","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/38/transactions` behind the x402 payment protocol. When called without payment, it returns a 402 challenge requiring a USDC payment on the Base network. The maximum amount required per call is 20,000 base units of USDC (0.02 USD), settled to the specified payTo address.\n\nThe hosting site lowpaymentfee.com advertises a broad catalog of pay-per-request APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (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 — payment is handled entirely via the x402 protocol on Base.\n\nHowever, the specific endpoint being listed here (`/api/v1/cards/38/transactions`) is not explicitly documented on the site's landing page among the advertised APIs. Its title \"Premium API Access\" and its path suggest it relates to card transaction data for a specific card (ID 38), but no schema, request format, or response format documentation is available. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content. Without documentation on what this endpoint accepts or returns, usage requires experimentation or direct knowledge of the API contract.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","card-transactions","pay-per-request","no-api-key"],"categories":["finance","payments"],"synonyms":["card transactions API","x402 payment endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["No request or response schema documentation available for this specific endpoint","The endpoint path /api/v1/cards/38/transactions is not listed among the site's publicly advertised APIs","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no content","The purpose and data returned by this endpoint are unclear — 'Premium API Access' is a generic label"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/38/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/38/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 (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation on request/response schemas, no OpenAPI spec, and the specific endpoint path is not listed among the site's advertised APIs. Docs pages render only a wallet-connect prompt. This is effectively a stub 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'network':63 'no-api-key' 'page':171,213 'path':183 'pay':11,26,95 'pay-per-cal':10,25 'pay-per-call API' 'pay-per-request':94 'payment':45,50,59,144 'payto':83 'per':12,27,68,96,132 'premium':178 'price':111,210 'prompt':220 'protocol':46,151 'quot':116 'rate':114,139 'relat':186 'render':215 'request':97,133,200 'requir':56,67,235 'resourc':39 'respons':203 'return':52,233 'schema':199 'sentiment':104 'settl':79 'site':87,168 'span':99 'specif':156,193 'specifi':82 'suggest':184 'summar':106 'titl':177 'token':115 'transact':6,21,38,189 'unit':74 'usag':234 'usd':78 'usdc':15,30,58,76 'usdc-settlement' 'util':121 'valid':123 'via':148 'wallet':219 'web3':110 'without':49,225 'x402':2,17,44,150 'x402 payment endpoint' 'x402-gated':1,16 'x402-payment'","prices":[{"id":"d0b9aa4d-228c-4b38-a8db-0802c91f7fdd","listingId":"2f2f80f0-08ba-426f-8f4e-ac63c0c246f3","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/38/transactions","description":"Premium API 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access.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge requires maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/38/transactions"},{"claim":"The site advertises all endpoints at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages show only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving transaction history for a specific card via programmatic pay-per-call access","Integrating card transaction data into agent workflows that support x402 payments","Demonstrating x402 protocol usage for micropayment-gated API access"],"bestFor":["Developers experimenting with x402 payment protocol on Base","Agents that can autonomously settle USDC micropayments for API access","Use cases needing keyless, per-request API access without subscriptions"],"notFor":["Production workloads requiring documented request/response schemas","Users who need traditional API-key-based authentication","High-volume batch processing where per-request fees add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.978Z"},"updatedAt":"2026-04-24T20:02:27.639Z"}}