{"id":"38be81c8-e1c7-4171-9f66-44b521a48efc","shortId":"rhUZgs","kind":"x402","title":"x402-gated card-transactions endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated card-transactions endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com exposes a POST resource at `/api/v1/cards/26/transactions` behind an x402 payment challenge. It is part of a broader platform that offers dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request settled in USDC on the Base network.\n\nThe specific `/cards/26/transactions` path suggests a card-transaction lookup or creation resource, but the provider's landing page does not list this particular endpoint among its advertised categories, and no OpenAPI schema, request/response examples, or detailed documentation were found in the crawl. The docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no further content. Because of this, the exact input parameters and response shape are unknown.\n\nPayment is handled via the x402 protocol (version 1, \"exact\" scheme). The challenge advertises a maxAmountRequired of 20000 base units of USDC (contract 0x8335…2913 on Base, 6 decimals), which equals $0.02. No API keys or rate limits are advertised; access is granted per-request upon valid payment. The payTo address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 and the maximum timeout is 300 seconds.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","card-transactions","post-endpoint"],"categories":["finance","payments"],"synonyms":["card transactions API","lowpaymentfee","x402 cards endpoint","USDC micropayment API","Base network API","card transaction lookup","pay-per-call API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The /cards/26/transactions path is not listed among the provider's advertised APIs — its purpose is unclear","All doc/pricing/API pages returned only a 'Connect wallet' prompt with no substantive content","Request body format and response shape are completely unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/26/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/26/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 (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and no documentation beyond a wallet-connect prompt. The specific /cards/26/transactions path is not listed on the provider's own landing page, making its purpose uncertain. Effectively a stub 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'/cards/26/transactions':87 '0.02':11,26,75,188 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':210 '0x8335':180 '1':165 '20000':174 '2913':181 '300':216 '6':184 'Base network API' 'USDC micropayment API' 'access':197 'address':208 'advertis':112,170,196 'ai/ml':65 'among':110 'analyt':64 'api':61,132,190 'base':9,24,83,175,183 'behind':41 'broader':51 'call':60 'card':5,20,92 'card transaction lookup' 'card transactions API' 'card-transact':4,19,91 'card-transactions' 'categori':113 'challeng':45,169 'connect':138 'content':144 'contract':179 'crawl':127 'creation':96 'data':63,68 'decim':185 'detail':121 'doc':129 'document':122 'dozen':55 'endpoint':7,22,32,109 'equal':187 'exact':149,166 'exampl':119 'expos':35 'finance/web3':67 'found':124 'gate':3,18 'grant':199 'handl':159 'infer':66 'infrastructur':70 'input':150 'key':191 'land':102 'limit':194 'list':106 'lookup':94 'lowpaymentfee' 'lowpaymentfee.com':34 'maxamountrequir':172 'maximum':213 'network':84 'offer':54 'openapi':116 'page':103,133 'paramet':151 'part':48 'particular':108 'path':88 'pay':10,25,58 'pay-per-cal':57 'pay-per-call API' 'pay-per-request' 'payment':44,157,205 'payto':207 'per':12,27,59,76,201 'per-request':200 'platform':52 'post':37 'post-endpoint' 'price':73,130 'prompt':140 'protocol':163 'provid':100 'rate':193 'request':13,28,77,202 'request/response':118 'resourc':38,97 'respons':153 'return':135 'schema':117 'scheme':167 'second':217 'settl':78 'shape':154 'span':62 'specif':86 'suggest':89 'timeout':214 'transact':6,21,93 'unit':176 'unknown':156 'upon':203 'usdc':15,30,80,178 'usdc-base' 'util':71 'valid':204 'version':164 'via':160 'wallet':139 'x402':2,17,43,162 'x402 cards endpoint' 'x402-gated':1,16 'x402-payment'","prices":[{"id":"887513f6-a0a2-4c29-a475-267d9b751bfd","listingId":"38be81c8-e1c7-4171-9f66-44b521a48efc","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/26/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":"2026-04-18T18:43:23.171Z"}],"sources":[{"listingId":"38be81c8-e1c7-4171-9f66-44b521a48efc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/26/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:23.171Z","lastSeenAt":"2026-04-24T21:31:50.669Z"}],"details":{"listingId":"38be81c8-e1c7-4171-9f66-44b521a48efc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/26/transactions \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","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/26/transactions"},{"claim":"The provider advertises $0.02 per request, no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The provider lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying or creating card transaction records via a single paid API call","Integrating card transaction data into automated agent workflows without API keys","Programmatic access to card-level transaction information settled in USDC on Base"],"bestFor":["Agents that can settle x402 USDC payments on Base","Developers wanting keyless, pay-per-call card transaction access","Workflows requiring low-cost ($0.02) per-request pricing with no commitments"],"notFor":["Users who need detailed API documentation or schema guarantees before integrating","High-volume batch processing where per-request fees add up quickly","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:27.465Z"},"updatedAt":"2026-04-24T21:31:50.669Z"}}