{"id":"3e85ec8f-5b78-47cb-b76d-996a0ee26a3d","shortId":"DyELUs","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 card transactions resource at `/api/v1/cards/9/transactions` behind the x402 payment protocol. It accepts 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 equals $0.02 per request (USDC uses 6 decimals).\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-request APIs spanning data & analytics, AI/ML inference (sentiment, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation) — all priced at $0.02 per call with no API keys, no rate limits, and no commitments. However, the specific endpoint being listed here (`/api/v1/cards/9/transactions`) is not explicitly documented on the site's landing page, and no request/response schema is provided in the crawled material. The endpoint's description in the x402 challenge is simply \"Premium API Access,\" giving little detail about what data it returns or what input it expects.\n\nBecause there is no OpenAPI spec, no documentation beyond the landing page, and no example payloads for this particular route, the exact functionality remains unclear. It likely relates to card transaction data (given the URL path), but this is inferred from the URL structure alone.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","card-transactions","http-post"],"categories":["finance","payments"],"synonyms":["card transactions API","x402 USDC endpoint","pay-per-call API","lowpaymentfee","Base network API","card data endpoint"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The specific /api/v1/cards/9/transactions route is not listed on the provider's landing page among advertised APIs","All docs, pricing, API, and README pages returned only 'Connect wallet' with no substantive content","Exact input/output format is unknown — example request/response cannot be provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/9/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/9/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/request in USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation for this specific route, and the crawled docs pages are empty. The endpoint's purpose is inferred solely from its URL 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'0.02':83,131 '000':75 '0x8335':80 '20':74 '6':88 'Base network API' 'accept':48 'access':184 'advertis':69,94 'ai/ml':106 'alon':242 'analyt':105 'api':102,136,183 'base':9,24,64,76 'behind':42 'beyond':206 'broader':91 'call':13,28,133 'card':5,20,37,227 'card data endpoint' 'card transactions API' 'card-transact':4,19 'card-transactions' 'carri':58 'challeng':68,179 'classif':110 'commit':143 'convers':126 'cost':72 'crawl':170 'data':104,190,229 'decim':89 'descript':175 'detail':187 'document':155,205 'embed':111 'endpoint':7,22,32,147,173 'equal':82 'estim':120 'exact':219 'exampl':212 'exchang':115 'expect':197 'explicit':154 'expos':35 'feed':114 'finance/web3':112 'function':220 'gas':119 'gate':3,18 'generat':127 'geocod':124 'give':185 'given':230 'header':57 'howev':144 'http-post' 'infer':107,237 'infrastructur':122 'input':195 'key':137 'land':160,208 'like':224 'limit':140 'list':149 'littl':186 'lowpaymentfee' 'lowpaymentfee.com':34,92 'materi':171 'maximum':71 'network':65 'openapi':202 'page':161,209 'particular':216 'path':233 'pay':11,26,99 'pay-per-cal':10,25 'pay-per-call API' 'pay-per-request':98 'payload':213 'payment':45,56,61 'per':12,27,84,100,132 'platform':93 'post':49 'premium':182 'price':113,129 'protocol':46 'provid':167 'quot':118 'rate':116,139 'relat':225 'remain':221 'request':50,85,101 'request/response':164 'requir':52 'resourc':39 'return':192 'rout':217 'schema':165 'sentiment':108 'simpli':181 'site':158 'span':103 'spec':203 'specif':146 'structur':241 'suit':96 'summar':109 'token':117 'transact':6,21,38,228 'unclear':222 'unit':77 'url':232,240 'usdc':15,30,60,79,86 'usdc-base' 'use':87 'util':123 'valid':125 'x':55 'x-payment':54 'x402':2,17,44,67,178 'x402 USDC endpoint' 'x402-gated':1,16 'x402-payment'","prices":[{"id":"60d0b7a8-2d14-45fc-b43d-c44bd6f06997","listingId":"3e85ec8f-5b78-47cb-b76d-996a0ee26a3d","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/9/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":"2026-04-18T18:43:58.261Z"}],"sources":[{"listingId":"3e85ec8f-5b78-47cb-b76d-996a0ee26a3d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/9/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:58.261Z","lastSeenAt":"2026-04-24T16:02:33.878Z"}],"details":{"listingId":"3e85ec8f-5b78-47cb-b76d-996a0ee26a3d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/9/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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/9/transactions"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/9/transactions"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Landing page lists APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving or submitting card transaction data via a pay-per-request model","Integrating card transaction lookups into agent workflows without API key management","Programmatic access to card-level transaction records settled via USDC on Base"],"bestFor":["Developers wanting keyless, pay-per-call access to card transaction data","AI agents that can settle x402 payments on Base","Use cases requiring no subscription or rate-limit constraints"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before integrating","High-volume batch processing where per-request pricing may add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.77Z"},"updatedAt":"2026-04-24T16:02:33.878Z"}}