{"id":"d7720209-3e60-4ff2-899f-ae3dfcdea31a","shortId":"qmVaWv","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/89/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 and settled in USDC on the Base network.\n\nThe specific `/cards/89/transactions` path suggests a financial or card-related transaction lookup or creation endpoint, though no detailed documentation or request/response schema is available beyond the x402 challenge metadata. The challenge advertises a `maxAmountRequired` of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02 USD. Payment is made via the x402 \"exact\" scheme to the specified payTo address, with a 300-second timeout.\n\nThe platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof. Documentation pages (`/docs`, `/pricing`, `/api`, `/README`) all resolve but contain only a \"Connect wallet\" prompt with no substantive technical content, so the actual request body format and response schema for this endpoint remain undocumented.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","card-transactions","pay-per-request","no-api-key"],"categories":["finance","payments"],"synonyms":["card transactions API","x402 payment API","USDC micropayment endpoint","Base network API","pay-per-call finance API","lowpaymentfee"],"warnings":["No request or response schema is documented; the actual payload format is unknown.","All documentation pages (/docs, /pricing, /api, /README) contain only a 'Connect wallet' prompt with no technical content.","The purpose of the /cards/89/transactions endpoint is unclear — 'Premium API Access' is a generic label applied across the platform.","The hardcoded card ID '89' in the path suggests this may be a demo or placeholder resource."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/89/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/89/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 confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and no explanation of what the /cards/89/transactions resource actually does. All doc pages return only a 'Connect wallet' 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'/api/v1/cards/89/transactions':42 '/cards/89/transactions':90 '/docs':186 '/pricing':187 '/readme':189 '0.02':11,26,77,138 '000':125 '0x8335':130 '20':124 '2913':131 '300':155 '6':134 'Base network API' 'USDC micropayment endpoint' 'access':169 'actual':206 'address':152 'advertis':120,160 'ai/ml':67 'analyt':66 'api':63,162 'attach':172 'avail':112 'base':9,24,86,126,133 'base-network' 'behind':43 'beyond':113 'bodi':208 'broader':53 'call':62 'caller':170 'card':5,20,38,97 'card transactions API' 'card-rel':96 'card-transact':4,19,37 'card-transactions' 'challeng':47,116,119 'connect':196 'contain':193 'content':203 'creation':102 'data':65,70 'decim':135 'detail':106 'document':107,184 'dozen':57 'endpoint':7,22,32,103,215 'equal':137 'exact':146 'expos':35 'finance/web3':69 'financi':94 'format':209 'gate':3,18 'header':177 'infer':68 'infrastructur':72 'instant':168 'key':163 'limit':166 'lookup':100 'lowpaymentfee' 'lowpaymentfee.com':34 'made':142 'maxamountrequir':122 'metadata':117 'network':87 'no-api-key' 'offer':56 'page':185 'part':50 'path':91 'pay':10,25,60 'pay-per-cal':59 'pay-per-call finance API' 'pay-per-request' 'payment':46,140,176,182 'payto':151 'per':12,27,61,78 'platform':54,159 'price':75 'prompt':198 'proof':183 'rate':165 'relat':98 'remain':216 'request':13,28,79,207 'request/response':109 'resolv':191 'resourc':40 'respons':211 'schema':110,212 'scheme':147 'second':156 'settl':81 'simpli':171 'span':64 'specif':89 'specifi':150 'substant':201 'suggest':92 'technic':202 'though':104 'timeout':157 'transact':6,21,39,99 'undocu':217 'unit':127 'usd':139 'usdc':15,30,83,129 'usdc-settlement' 'util':73 'valid':180 'via':143 'wallet':197 'x':175 'x-payment':174 'x402':2,17,45,115,145,181 'x402 payment API' 'x402-gated':1,16 'x402-payment'","prices":[{"id":"c1378b32-3d9b-40f7-9768-81f438af8175","listingId":"d7720209-3e60-4ff2-899f-ae3dfcdea31a","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/89/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":"2026-04-18T18:44:04.276Z"}],"sources":[{"listingId":"d7720209-3e60-4ff2-899f-ae3dfcdea31a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/89/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:04.276Z","lastSeenAt":"2026-04-24T14:32:43.033Z"}],"details":{"listingId":"d7720209-3e60-4ff2-899f-ae3dfcdea31a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/89/transactions \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/89/transactions"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages resolve but contain only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying or creating card transaction records via a pay-per-call model","Integrating card transaction data into agent workflows without API key management","Programmatic access to financial transaction endpoints settled in USDC on Base"],"bestFor":["Agents needing keyless, pay-per-request access to card transaction data","Developers prototyping x402-based payment flows on Base","Scenarios where avoiding subscription commitments is preferred"],"notFor":["Production use requiring well-documented request/response schemas","High-volume batch processing where per-request pricing is inefficient","Users who need fiat-only payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.493Z"},"updatedAt":"2026-04-24T14:32:43.033Z"}}