{"id":"e01db3f3-7ee5-472a-a262-99329a52dca1","shortId":"EbRFEB","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 resource at `/api/v1/cards/90/transactions` behind an x402 payment challenge. The endpoint is live and returns a 402 with an exact-scheme challenge requiring USDC payment on the Base network. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD per request. Payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base.\n\nThe provider's landing page advertises a broad catalog of x402-gated APIs spanning data & analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and instant access. However, the specific endpoint listed here (`/api/v1/cards/90/transactions`) is labeled only as \"Premium API Access\" and does not appear in the provider's publicly listed catalog. There is no documentation, request/response schema, or usage examples available for this particular endpoint. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content.\n\nBecause the endpoint's purpose is unclear — the path suggests card transaction data but no schema or documentation confirms this — agents should treat this as an opaque POST endpoint with unknown input/output contracts. The x402 challenge itself is well-formed and the endpoint is confirmed live.","tags":[],"capabilities":["x402-payment","usdc-base","post-endpoint","pay-per-request","no-api-key"],"categories":["finance","payments"],"synonyms":["card transactions API","x402 endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["No documentation available for this specific endpoint — docs/pricing/README pages only show 'Connect wallet'","Endpoint path /api/v1/cards/90/transactions does not appear in the provider's public API catalog","No request or response schema available; input/output contract is unknown","The hardcoded '90' in the path suggests a resource-specific endpoint but its meaning is undocumented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/90/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/90/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is well-formed and the endpoint is confirmed live, but there is no documentation, no request/response schema, and the endpoint's actual purpose is unclear. The specific path does not appear in the provider's public catalog. Effectively a stub 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'0.02':11,26,84,127 '000':75 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':93 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':98 '20':74 '402':53 '6':80 'Base network API' 'USDC micropayment API' 'access':139,153 'addit':195 'address':92 'advertis':106 'agent':217 'ai/ml':118 'amount':69 'analyt':117 'api':114,132,152,181 'appear':157 'avail':174 'base':9,24,65,76,100 'behind':41 'broad':108 'call':72 'card':5,20,207 'card transactions API' 'card-transact':4,19 'catalog':109,164 'challeng':45,59,232 'confirm':215,242 'connect':190 'content':196 'contract':97,229 'data':116,209 'decim':81 'doc':180 'document':168,214 'endpoint':7,22,32,47,143,178,199,225,240 'equal':83 'exact':57 'exact-schem':56 'exampl':173 'expos':35 'finance/web3':120 'form':237 'gate':3,18,113 'howev':140 'infer':119 'infrastructur':122 'input/output':228 'instant':138 'key':133 'label':148 'land':104 'limit':136 'list':144,163 'live':49,243 'lowpaymentfee' 'lowpaymentfee.com':34 'maximum':68 'network':66 'no-api-key' 'opaqu':223 'page':105,185 'particular':177 'path':205 'pay':10,25 'pay-per-call API' 'pay-per-request' 'payment':44,62,88 'per':12,27,71,86,128 'post':37,224 'post-endpoint' 'premium':151 'price':125,182 'prompt':192 'provid':102,160 'public':162 'purpos':201 'rate':135 'readm':184 'render':187 'request':13,28,87,129 'request/response':169 'requir':60,70 'resourc':38 'return':51 'schema':170,212 'scheme':58 'sent':90 'span':115 'specif':142 'suggest':206 'transact':6,21,208 'treat':219 'unclear':203 'unit':77 'unknown':227 'usag':172 'usd':85 'usdc':15,30,61,79,96 'usdc-base' 'use':94 'util':123 'wallet':191 'well':236 'well-form':235 'x402':2,17,43,112,231 'x402 endpoint' 'x402-gated':1,16,111 'x402-payment'","prices":[{"id":"6c17a8c2-fa9f-4d00-970c-be236fe7f45e","listingId":"e01db3f3-7ee5-472a-a262-99329a52dca1","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/90/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":"2026-04-18T18:43:54.545Z"}],"sources":[{"listingId":"e01db3f3-7ee5-472a-a262-99329a52dca1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/90/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:54.545Z","lastSeenAt":"2026-04-24T16:02:33.675Z"}],"details":{"listingId":"e01db3f3-7ee5-472a-a262-99329a52dca1","quickStartSnippet":"# 1. Send a POST to get the 402 challenge\ncurl -X POST https://lowpaymentfee.com/api/v1/cards/90/transactions\n# Returns 402 with x402 payment challenge\n# 2. Construct X-PAYMENT header with USDC payment proof (20000 base units = $0.02)\n# 3. Resend POST with X-PAYMENT header to access the resource","exampleRequest":null,"exampleResponse":{"error":"X-PAYMENT header is required","accepts":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/cards/90/transactions","description":"Premium API Access","maxAmountRequired":"20000","maxTimeoutSeconds":300}],"x402Version":1},"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","source_url":"https://lowpaymentfee.com/api/v1/cards/90/transactions"},{"claim":"The provider advertises all APIs at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/cards/90/transactions"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching card transaction data (speculative, based on URL path)","Demonstrating x402 payment flow integration on Base","Pay-per-request API consumption without API key management"],"bestFor":["Developers experimenting with x402 payment protocol on Base","Agents that can settle USDC micropayments on Base L2","Use cases needing keyless, pay-per-call API access"],"notFor":["Production use requiring documented request/response schemas","Users who need free or fiat-settled API access","Anyone needing detailed API documentation before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.898Z"},"updatedAt":"2026-04-24T16:02:33.675Z"}}