{"id":"e3dddd47-51df-428a-b877-88855e9825bc","shortId":"vcWFyh","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/76/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 endpoint probed (`/api/v1/cards/76/transactions`) is labeled \"Premium API Access\" and accepts HTTP POST requests. The x402 challenge advertises a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 `exact` scheme to the specified payTo address, with a 300-second timeout. No API keys or rate limits are advertised; access is granted purely through per-request micropayment.\n\nDocumentation on the site is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawl. The endpoint is confirmed live (402 challenge returned), but the actual behavior and data returned after payment are unknown from the available material.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","card-transactions","pay-per-request","no-api-key"],"categories":["finance","payments"],"synonyms":["card transactions API","x402 micropayment API","USDC pay-per-call","lowpaymentfee","Base network API","402 payment endpoint"],"warnings":["No OpenAPI spec or request/response schema available","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no content","The actual data returned by this endpoint after payment is completely unknown from available material","The endpoint path references a specific card ID (76); it is unclear whether this is a demo or a real resource"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/76/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/76/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, but there is virtually no documentation: no OpenAPI spec, no request/response schema, no examples, and no explanation of what data the endpoint actually returns. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'0.02':11,26,77,122 '000':111 '0x8335':116 '20':110 '2913':117 '300':143 '402':210 '402 payment endpoint' '6':126 'Base network API' 'USDC pay-per-call' 'accept':98 'access':96,154 'actual':215 'address':140 'advertis':105,153 'ai/ml':67 'amount':108 'analyt':66 'api':63,95,147,173 'avail':201,226 'base':9,24,85,112,119 'base-network' 'behavior':216 'behind':43 'broader':53 'call':62 'card':5,20,38 'card transactions API' 'card-transact':4,19,37 'card-transactions' 'challeng':47,104,211 'confirm':208 'connect':181 'crawl':204 'data':65,70,218 'decim':127 'detail':188 'doc':171 'document':163 'dozen':57 'endpoint':7,22,32,89,206 'equal':121 'exact':134 'exampl':200 'expos':35 'extrem':168 'finance/web3':69 'gate':3,18 'given':123 'grant':156 'http':99 'infer':68 'infrastructur':72 'key':148 'label':93 'limit':151 'live':209 'lowpaymentfee' 'lowpaymentfee.com':34 'made':130 'materi':227 'maximum':107 'micropay':162 'network':86 'no-api-key' 'offer':56 'openapi':192 'page':176 'part':50 'pay':10,25,60 'pay-per-cal':59 'pay-per-request' 'payment':46,128,221 'payto':139 'per':12,27,61,78,160 'per-request':159 'platform':54 'post':100 'premium':94 'price':75,172 'probe':90 'prompt':183 'pure':157 'rate':150 'readm':175 'render':178 'request':13,28,79,101,161 'request/response':195 'resourc':40 'return':212,219 'schema':196 'scheme':135 'second':144 'settl':80 'site':166 'span':64 'spars':169 'spec':193 'specif':88 'specifi':138 'technic':187 'timeout':145 'transact':6,21,39 'unit':113 'unknown':223 'usag':199 'usdc':15,30,82,115,124 'usdc-micropayment' 'util':73 'via':131 'wallet':182 'x402':2,17,45,103,133 'x402 micropayment API' 'x402-gated':1,16 'x402-payment'","prices":[{"id":"6922a9bc-534b-451c-950b-e4d22c752849","listingId":"e3dddd47-51df-428a-b877-88855e9825bc","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/76/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":"2026-04-18T18:43:42.465Z"}],"sources":[{"listingId":"e3dddd47-51df-428a-b877-88855e9825bc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/76/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:42.465Z","lastSeenAt":"2026-04-24T18:32:23.672Z"}],"details":{"listingId":"e3dddd47-51df-428a-b877-88855e9825bc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/76/transactions\n# Returns 402 with x402 challenge; attach X-PAYMENT header with signed USDC payment to access.","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 with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/cards/76/transactions"},{"claim":"All APIs on the platform 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 asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/76/transactions"}],"useCases":["Fetching card transaction data via a single micropayment without needing an API key","Integrating pay-per-call card transaction lookups into agent workflows","Programmatic access to transaction records settled on Base L2"],"bestFor":["Developers wanting keyless, pay-per-request access to card transaction data","AI agents that can settle x402 micropayments on Base","Prototyping workflows that need transaction data without subscription commitments"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would prefer bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.522Z"},"updatedAt":"2026-04-24T18:32:23.672Z"}}