{"id":"6c5deff7-dc85-4d8f-917b-d552d8645481","shortId":"D6HapW","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/92/transactions` behind the x402 payment protocol. It accepts HTTP POST requests and requires an X-PAYMENT header carrying a USDC payment on the Base network. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…), which at 6 decimals equals $0.02 per request.\n\nThe parent site lowpaymentfee.com hosts a broader catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per request with no API keys, no rate limits, and no commitments. However, the specific `/api/v1/cards/92/transactions` endpoint is not listed on the site's public catalog, and its exact functionality is undocumented. The path suggests it relates to transaction data for a particular card resource (card ID 92), but no request/response schema, field definitions, or example payloads are available.\n\nThe endpoint is live and returns a valid x402 version-1 challenge. Payment settles in USDC on Base to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3. No OpenAPI spec, no detailed docs, and no example responses were found during the crawl — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","card-transactions","http-post"],"categories":["finance","payments"],"synonyms":["card transactions API","x402 USDC endpoint","pay-per-request API","lowpaymentfee","Base network API","card 92 transactions","micropayment API"],"warnings":["No API documentation available — docs, pricing, and API pages render only a wallet-connect prompt","The /api/v1/cards/92/transactions path is not listed in the provider's public API catalog","No request body schema or response schema is provided; callers cannot know what fields to send or expect","Endpoint purpose is inferred solely from the URL path; actual behavior is unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/92/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/92/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 listed on the provider's own catalog. Functionality must be entirely inferred from the URL path. This is effectively a stub 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'/api/v1/cards/92/transactions':41,133 '0.02':87,117 '000':76 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':197 '0x8335':81 '20':75 '6':84 '92':165 'Base network API' 'accept':48 'addit':228 'address':196 'advertis':70 'ai/ml':107 'analyt':106 'api':103,122,217 'avail':176 'base':9,24,65,77,194 'behind':42 'broader':96 'call':13,28,102 'card':5,20,37,161,163 'card 92 transactions' 'card transactions API' 'card-transact':4,19 'card-transactions' 'carri':59 'catalog':97,143 'challeng':69,188 'commit':129 'connect':223 'content':229 'cost':73 'crawl':212 'data':105,110,157 'decim':85 'definit':171 'detail':202 'doc':203,214 'endpoint':7,22,32,134,178 'equal':86 'exact':146 'exampl':173,206 'expos':35 'field':170 'finance/web3':109 'found':209 'function':147 'gate':3,18 'header':58 'host':94 'howev':130 'http':49 'http-post' 'id':164 'infer':108 'key':123 'limit':126 'list':137 'live':180 'lowpaymentfee' 'lowpaymentfee.com':34,93 'maximum':72 'micropayment API' 'network':66 'openapi':199 'page':218 'parent':91 'particular':160 'path':151 'pay':11,26,100 'pay-per-cal':10,25,99 'pay-per-call' 'pay-per-request API' 'payload':174 'payment':45,57,62,189 'per':12,27,88,101,118 'post':50 'price':115,215 'prompt':225 'protocol':46 'public':142 'rate':125 'relat':154 'render':220 'request':51,89,119 'request/response':168 'requir':53 'resourc':39,162 'respons':207 'return':182 'schema':169 'servic':113 'settl':190 'site':92,140 'span':104 'spec':200 'specif':132 'suggest':152 'transact':6,21,38,156 'undocu':149 'unit':78 'usdc':15,30,61,80,192 'usdc-base' 'util':112 'valid':184 'version':186 'wallet':224 'x':56 'x-payment':55 'x402':2,17,44,68,185 'x402 USDC endpoint' 'x402-gated':1,16 'x402-payment'","prices":[{"id":"159ae935-fef3-4a2a-9f1a-21c941dda091","listingId":"6c5deff7-dc85-4d8f-917b-d552d8645481","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/92/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":"2026-04-18T18:44:00.113Z"}],"sources":[{"listingId":"6c5deff7-dc85-4d8f-917b-d552d8645481","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/92/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:00.113Z","lastSeenAt":"2026-04-24T16:02:33.954Z"}],"details":{"listingId":"6c5deff7-dc85-4d8f-917b-d552d8645481","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/92/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":"The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/92/transactions"},{"claim":"The site advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/92/transactions"},{"claim":"Docs, pricing, and API pages render only a Connect wallet prompt with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving or posting transaction records for a specific card resource","Programmatic access to card transaction data without API key management","Agent-driven financial data retrieval with per-call USDC micropayments"],"bestFor":["Developers wanting keyless, pay-per-call access to card transaction data","AI agents that can settle x402 payments in USDC on Base","Users who prefer no-subscription, usage-based pricing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before integrating","Bulk data exports where per-call pricing would be cost-prohibitive","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.627Z"},"updatedAt":"2026-04-24T16:02:33.954Z"}}