{"id":"32ef934e-6a09-46c1-befc-0eeafd282cad","shortId":"XuqdTt","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 provides access to a card transactions resource at `/api/v1/cards/99/transactions` via the x402 payment protocol. The endpoint is live and returns a 402 challenge requiring payment in USDC on the Base network. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 per request.\n\nThe hosting site lowpaymentfee.com advertises a broad catalog of pay-per-call APIs spanning data & analytics, AI/ML (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 instant access via the Base network. However, the specific endpoint being listed here (`/cards/99/transactions`) is not explicitly documented on the site's landing page among the advertised APIs, so its exact functionality is unclear.\n\nThe endpoint accepts POST requests and settles payments to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. No OpenAPI schema, detailed documentation, or example request/response bodies were found in the crawl. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","card-transactions","pay-per-call","no-api-key"],"categories":["finance","payments"],"synonyms":["card transactions API","payment processing","transaction data","x402 endpoint","USDC micropayment API","Base network API","lowpaymentfee"],"warnings":["The /api/v1/cards/99/transactions endpoint is not listed among the site's advertised APIs — its purpose and expected input/output are unknown.","No API documentation, OpenAPI spec, or example payloads are available.","All documentation pages (docs, API, pricing, README) returned only a 'Connect wallet' prompt with no content.","The hardcoded card ID '99' in the path suggests this may be a demo or placeholder endpoint."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/99/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/99/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 OpenAPI schema, no documentation of request/response formats, and the specific /cards/99/transactions path is not listed among the site's advertised APIs. The docs pages are empty beyond a wallet-connect prompt. Functionality must be entirely 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'/cards/99/transactions':153 '0.02':81,129 '000':72 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':184 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':187 '20':71 '402':54 '6':77 'Base network API' 'USDC micropayment API' 'accept':176 'access':34,141 'address':183 'advertis':88,166 'ai/ml':101 'among':164 'amount':66 'analysi':103 'analyt':100 'api':97,134,167,206 'base':8,22,62,73,144,189 'base-network' 'bodi':198 'broad':90 'call':12,26,69,96 'card':4,18,37 'card transactions API' 'card-transactions' 'catalog':91 'challeng':55 'classif':105 'connect':215 'content':221 'convers':122 'crawl':203 'data':99 'decim':78 'detail':193 'doc':205 'document':157,194 'embed':106 'endpoint':6,20,30,48,125,149,175 'equal':80 'estim':116 'exact':170 'exampl':196 'exchang':111 'explicit':156 'feed':110 'financ':107 'found':200 'function':171 'gas':115 'gate':3,17 'generat':123 'geocod':120 'host':85 'howev':146 'infrastructur':118 'instant':140 'key':135 'land':162 'limit':138 'list':127,151 'live':50 'lowpaymentfee' 'lowpaymentfee.com':32,87 'maximum':65 'network':63,145 'no-api-key' 'openapi':191 'page':163,210 'pay':10,24,94 'pay-per-cal':9,23,93 'pay-per-call' 'payment':45,57,181 'payment processing' 'per':11,25,68,82,95,130 'post':177 'price':109,207 'prompt':217 'protocol':46 'provid':33 'quot':114 'rate':112,137 'readm':209 'request':83,131,178 'request/response':197 'requir':56,67 'resourc':39 'return':52,212 'schema':192 'sentiment':102 'settl':180 'site':86,160 'span':98 'specif':148 'substant':220 'summar':104 'token':113 'transact':5,19,38 'transaction data' 'unclear':173 'unit':74 'usdc':14,28,59,76,186 'usdc-settlement' 'use':185 'util':119 'valid':121 'via':42,142 'wallet':216 'web3':108 'x402':2,16,44 'x402 endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"ec5d7770-20ad-4729-ba96-2a1e85aa4679","listingId":"32ef934e-6a09-46c1-befc-0eeafd282cad","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/99/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":"2026-04-18T18:43:55.788Z"}],"sources":[{"listingId":"32ef934e-6a09-46c1-befc-0eeafd282cad","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/99/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:55.788Z","lastSeenAt":"2026-04-24T16:31:46.797Z"}],"details":{"listingId":"32ef934e-6a09-46c1-befc-0eeafd282cad","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/99/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":"The endpoint returns a 402 challenge requiring USDC payment on Base with maxAmountRequired of 20000 base units ($0.02).","source_url":"https://lowpaymentfee.com/api/v1/cards/99/transactions"},{"claim":"The site advertises all APIs at $0.02/request with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 and payTo is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.","source_url":"https://lowpaymentfee.com/api/v1/cards/99/transactions"}],"useCases":["Retrieving card transaction data for a specific card via pay-per-call","Integrating card transaction lookups into agent workflows without API key management","Programmatic access to transaction records settled via USDC on Base"],"bestFor":["Agents needing keyless, pay-per-call access to card transaction data","Developers experimenting with x402 payment protocol integrations","Workflows requiring on-demand transaction retrieval without subscriptions"],"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 integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.862Z"},"updatedAt":"2026-04-24T16:31:46.797Z"}}