{"id":"5bc9cf6a-1573-44c7-a0b7-087e4e764547","shortId":"xdQMF2","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 route at `/api/v1/cards/79/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 gated via the x402 protocol on the Base network, settled in USDC.\n\nThe specific endpoint listed here is labeled \"Premium API Access\" and relates to card transactions (resource path `/api/v1/cards/79/transactions`). However, the platform provides no public documentation, OpenAPI schema, or example request/response payloads for this or any other endpoint — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. As a result, the exact input parameters, response format, and functional behavior of this endpoint are unknown.\n\nPricing is $0.02 per request (the x402 challenge advertises a maxAmountRequired of 20000 base units of USDC on Base, which is 20000 / 10^6 = $0.02). Payment is made via the x402 exact scheme to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3. No API keys, rate limits, or subscriptions are required — access is purely pay-per-call. The endpoint is live and returns a proper 402 challenge.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","card-transactions","no-api-key","post-endpoint"],"categories":["finance","payments"],"synonyms":["card transactions API","x402 API","pay-per-request API","USDC micropayment API","lowpaymentfee","Base network API","card data endpoint"],"warnings":["No API documentation, OpenAPI schema, or example payloads are available for this endpoint.","The exact functionality of '/api/v1/cards/79/transactions' is unknown — the description 'Premium API Access' is generic and uninformative.","All documentation pages (docs, api, pricing, README) render only 'Connect wallet' with no content.","The hardcoded '/79/' in the path suggests this may be a specific card resource rather than a general-purpose endpoint."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/79/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/79/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 zero documentation: no OpenAPI schema, no example requests or responses, no description of what the endpoint actually returns. The docs/pricing/README pages are all empty beyond a wallet-connect prompt. The endpoint's purpose ('cards/79/transactions') is only inferable from the URL path. This is effectively a stub 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'0.02':11,26,159,181 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':192 '10':179 '20000':169,178 '402':217 '6':180 'Base network API' 'USDC micropayment API' 'access':94,202 'address':191 'advertis':165 'ai/ml':65 'analyt':64 'api':61,93,124,194 'base':9,24,80,170,175 'base-network' 'behavior':151 'behind':41 'broader':51 'call':60,208 'card':5,20,98 'card data endpoint' 'card transactions API' 'card-transact':4,19 'card-transactions' 'challeng':45,164,218 'connect':133 'content':139 'data':63,68 'doc':123 'document':109 'dozen':55 'endpoint':7,22,32,87,121,154,210 'exact':144,188 'exampl':113 'expos':35 'finance/web3':67 'format':148 'function':150 'gate':3,18,73 'howev':103 'infer':66 'infrastructur':70 'input':145 'key':195 'label':91 'limit':197 'list':88 'live':212 'lowpaymentfee' 'lowpaymentfee.com':34 'made':184 'maxamountrequir':167 'network':81 'no-api-key' 'offer':54 'openapi':110 'page':128 'paramet':146 'part':48 'path':101 'pay':10,25,58,206 'pay-per-cal':57,205 'pay-per-call' 'pay-per-request API' 'payload':115 'payment':44,182 'per':12,27,59,160,207 'platform':52,105 'post':37 'post-endpoint' 'premium':92 'price':125,157 'prompt':135 'proper':216 'protocol':77 'provid':106 'public':108 'pure':204 'rate':196 'readm':127 'relat':96 'render':130 'request':13,28,161 'request/response':114 'requir':201 'resourc':100 'respons':147 'result':142 'return':214 'rout':38 'schema':111 'scheme':189 'settl':82 'span':62 'specif':86 'subscript':199 'transact':6,21,99 'unit':171 'unknown':156 'usdc':15,30,84,173 'usdc-settlement' 'util':71 'via':74,185 'wallet':134 'x402':2,17,43,76,163,187 'x402 API' 'x402-gated':1,16 'x402-payment'","prices":[{"id":"7b1384aa-2cac-4375-af16-3dcd1d043ac2","listingId":"5bc9cf6a-1573-44c7-a0b7-087e4e764547","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/79/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":"2026-04-18T18:43:52.740Z"}],"sources":[{"listingId":"5bc9cf6a-1573-44c7-a0b7-087e4e764547","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/79/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:52.740Z","lastSeenAt":"2026-04-24T16:02:33.570Z"}],"details":{"listingId":"5bc9cf6a-1573-44c7-a0b7-087e4e764547","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/79/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":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/79/transactions"},{"claim":"Platform pricing is $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 contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/cards/79/transactions"},{"claim":"Docs, API, pricing, and README pages all show only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying card transaction data on a per-call payment basis","Integrating card transaction lookups into agent workflows without API key management","Programmatic access to card-level transaction records settled via crypto micropayments"],"bestFor":["Agents or services that need on-demand card transaction data without subscription commitments","Developers exploring x402 pay-per-call patterns on Base","Low-volume or bursty workloads where flat per-request pricing is preferable"],"notFor":["Users who need detailed API documentation or schema guarantees before integrating","High-volume production workloads requiring SLAs, rate-limit guarantees, or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.02Z"},"updatedAt":"2026-04-24T16:02:33.570Z"}}