{"id":"fed5c1eb-6751-4501-aec9-1155ae3a329a","shortId":"G7UgZs","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 POST resource at `/api/v1/cards/66/transactions` behind an x402 payment challenge. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base network), which equals $0.02 per request given USDC's 6 decimals. Payment is settled on-chain on Base to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3. No API keys or rate limits are advertised; access is granted purely via the x402 payment header.\n\nThe specific endpoint path (`/cards/66/transactions`) suggests it returns or creates transaction records associated with a particular card entity (ID 66), but no further documentation, request schema, or response schema is available. The provider's landing page lists a broad catalog of endpoints spanning data analytics, AI/ML inference, finance, crypto, infrastructure utilities, and more — all priced at $0.02 per request via x402 on Base. However, the `/cards/66/transactions` path does not appear in the publicly listed catalog, so its exact functionality is unclear.\n\nThe docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no substantive documentation. Without request/response schemas or usage examples, integrators will need to experiment with the endpoint to determine accepted input fields and output format. The endpoint is confirmed live (402 challenge returned successfully).","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","card-transactions","post-endpoint"],"categories":["finance","payments"],"synonyms":["card transactions API","x402 card endpoint","USDC pay-per-call","lowpaymentfee API","Base network API","402 payment endpoint","card transaction records"],"warnings":["No request or response schema available — input/output format is unknown","The /cards/66/transactions path does not appear in the provider's public API catalog","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no content","The purpose of 'cards/66' is unclear — it may be a demo, placeholder, or internal resource"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/66/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/66/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, and the specific /cards/66/transactions path is not listed in the provider's public catalog. Functionality must be guessed from the URL path 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'/cards/66/transactions':107,168 '0.02':67,159 '000':55 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':85 '0x8335':60 '20':54 '2913':61 '402':229 '402 payment endpoint' '6':73 '66':122 'Base network API' 'USDC pay-per-call' 'accept':218 'access':94 'address':84 'advertis':49,93 'ai/ml':148 'analyt':147 'api':87,187 'appear':172 'associ':115 'avail':133 'base':9,24,56,63,82,165 'base-network' 'behind':41 'broad':141 'call':13,28 'card':5,20,119 'card transaction records' 'card transactions API' 'card-transact':4,19 'card-transactions' 'catalog':142,177 'chain':80 'challeng':45,48,230 'confirm':227 'connect':195 'cost':52 'creat':112 'crypto':151 'data':146 'decim':74 'determin':217 'doc':185 'document':126,201 'endpoint':7,22,32,105,144,215,225 'entiti':120 'equal':66 'exact':180 'exampl':207 'experi':212 'expos':35 'field':220 'financ':150 'format':223 'function':181 'gate':3,18 'given':70 'grant':96 'header':102 'howev':166 'id':121 'infer':149 'infrastructur':152 'input':219 'integr':208 'key':88 'land':137 'limit':91 'list':139,176 'live':228 'lowpaymentfee API' 'lowpaymentfee.com':34 'maximum':51 'need':210 'network':64 'on-chain':78 'output':222 'page':138,190 'particular':118 'path':106,169 'pay':11,26 'pay-per-cal':10,25 'pay-per-call' 'payment':44,75,101 'per':12,27,68,160 'post':37 'post-endpoint' 'price':157,186 'prompt':197 'provid':135 'public':175 'pure':97 'rate':90 'readm':189 'record':114 'render':192 'request':69,127,161 'request/response':203 'resourc':38 'respons':130 'return':110,231 'schema':128,131,204 'settl':77 'span':145 'specif':104 'substant':200 'success':232 'suggest':108 'transact':6,21,113 'unclear':183 'unit':57 'usag':206 'usdc':15,30,59,71 'usdc-settlement' 'util':153 'via':98,162 'wallet':196 'without':202 'x402':2,17,43,47,100,163 'x402 card endpoint' 'x402-gated':1,16 'x402-payment'","prices":[{"id":"b7c04257-af85-41fb-b4eb-ffe419e132a0","listingId":"fed5c1eb-6751-4501-aec9-1155ae3a329a","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/66/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":"2026-04-18T18:43:50.356Z"}],"sources":[{"listingId":"fed5c1eb-6751-4501-aec9-1155ae3a329a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/66/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:50.356Z","lastSeenAt":"2026-04-24T17:32:42.646Z"}],"details":{"listingId":"fed5c1eb-6751-4501-aec9-1155ae3a329a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/66/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 advertises maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/66/transactions"},{"claim":"All listed endpoints are priced at $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 on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/cards/66/transactions"}],"useCases":["Retrieving or creating transaction records for a specific card entity via pay-per-call USDC payments","Integrating card transaction data into agent workflows without API key management","Programmatic access to card-level transaction data settled on Base L2"],"bestFor":["Developers wanting keyless, pay-per-request card transaction access","AI agents that can settle x402 USDC payments on Base","Prototyping integrations where no subscription commitment is desired"],"notFor":["Production use requiring documented request/response schemas and SLAs","High-volume batch processing where per-call pricing may be costly","Users who need detailed API documentation before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.14Z"},"updatedAt":"2026-04-24T17:32:42.646Z"}}