{"id":"8d85a354-0068-48fb-b7dd-2a7f23fd6b57","shortId":"7L5VQy","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 card-transactions resource at `/api/v1/cards/80/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 amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The endpoint is described generically as \"Premium API Access\" with no further documentation on what the transactions resource returns or what input fields it expects.\n\nThe broader lowpaymentfee.com platform lists several categories of pay-per-call APIs—data & analytics, AI & ML, finance & Web3, and infrastructure utilities—all priced at $0.02 per request and all gated via x402 on Base. However, the specific `/api/v1/cards/80/transactions` path does not appear in the site's public API catalog, and no OpenAPI schema, request/response examples, or detailed documentation were found for this endpoint. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional content.\n\nBecause there is no schema, no sample payloads, and no description of what \"card 80 transactions\" actually returns, consumers should treat this as an opaque endpoint. The x402 challenge is live and well-formed, confirming the endpoint is operational, but the lack of documentation makes it difficult to integrate without trial-and-error.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","card-transactions","post-endpoint"],"categories":["finance","payments"],"synonyms":["card transactions API","x402 card endpoint","USDC pay-per-call","lowpaymentfee API","Base network API","card 80 transactions"],"warnings":["No OpenAPI or request/response schema available for this endpoint","The /api/v1/cards/80/transactions path is not listed in the site's public API catalog","Docs, pricing, and API pages render only a 'Connect wallet' prompt with no usable content","Purpose of 'card 80 transactions' is unclear — could be placeholder or test data"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/80/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/80/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint works, but there is zero documentation on request/response schema, no OpenAPI spec, and the endpoint path doesn't appear in the site's own catalog. Effectively a stub 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'0.02':11,26,87,144 '000':76 '0x8335':81 '20':75 '2913':82 '6':92 '80':214 'Base network API' 'USDC pay-per-call' 'accept':49 'access':102 'actual':216 'addit':198 'advertis':70 'ai':134 'amount':73 'analyt':133 'api':101,131,167,187 'appear':161 'base':9,24,65,77,84,153 'behind':43 'broader':120 'call':130 'card':5,20,38,213 'card 80 transactions' 'card transactions API' 'card-transact':4,19,37 'card-transactions' 'carri':59 'catalog':168 'categori':125 'challeng':69,228 'confirm':235 'connect':193 'consum':218 'content':199 'data':132 'decim':93 'describ':97 'descript':210 'detail':176 'difficult':247 'doc':184 'document':106,177,244 'endpoint':7,22,32,95,182,225,237 'equal':86 'error':254 'exampl':174 'expect':118 'expos':35 'field':116 'financ':136 'form':234 'found':179 'gate':3,18,149 'generic':98 'header':58 'howev':154 'infrastructur':139 'input':115 'integr':249 'lack':242 'list':123 'live':230 'lowpaymentfee API' 'lowpaymentfee.com':34,121 'make':245 'maximum':72 'ml':135 'network':66 'opaqu':224 'openapi':171 'oper':239 'page':188 'path':158 'pay':10,25,128 'pay-per-cal':127 'pay-per-request' 'payload':207 'payment':46,57,62 'per':12,27,88,129,145 'platform':122 'post':50 'post-endpoint' 'premium':100 'price':142,185 'prompt':195 'protocol':47 'public':166 'render':190 'request':13,28,51,89,146 'request/response':173 'requir':53 'resourc':40,111 'return':112,217 'sampl':206 'schema':172,204 'sever':124 'site':164 'specif':156 'transact':6,21,39,110,215 'treat':220 'trial':252 'trial-and-error':251 'unit':78 'usdc':15,30,61,80,90 'usdc-base' 'use':91 'util':140 'via':150 'wallet':194 'web3':137 'well':233 'well-form':232 'without':250 'x':56 'x-payment':55 'x402':2,17,45,68,151,227 'x402 card endpoint' 'x402-gated':1,16 'x402-payment'","prices":[{"id":"c0d62ac2-f08d-4489-8376-ccd613386b1b","listingId":"8d85a354-0068-48fb-b7dd-2a7f23fd6b57","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/80/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":"2026-04-18T18:43:52.722Z"}],"sources":[{"listingId":"8d85a354-0068-48fb-b7dd-2a7f23fd6b57","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/80/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:52.722Z","lastSeenAt":"2026-04-24T16:31:45.677Z"}],"details":{"listingId":"8d85a354-0068-48fb-b7dd-2a7f23fd6b57","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/80/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","source_url":"https://lowpaymentfee.com/api/v1/cards/80/transactions"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/cards/80/transactions"},{"claim":"All listed APIs are priced at $0.02 per request with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, and API pages show only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving transaction history for a specific card resource via pay-per-call","Programmatic access to card transaction data without API keys or subscriptions","Agent-driven financial data retrieval settled in USDC on Base"],"bestFor":["Developers wanting keyless, pay-per-use card transaction data","AI agents that can settle x402 payments on Base in USDC","Prototyping integrations where low per-call cost matters"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume batch processing where per-call pricing adds up","Anyone needing non-USDC or non-Base settlement options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.022Z"},"updatedAt":"2026-04-24T16:31:45.677Z"}}