{"id":"f3d97f41-d3c9-465f-b927-c663bc7963c7","shortId":"y4Kv7h","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/94/transactions` behind an x402 payment challenge. The provider's site describes it as \"Premium API Access\" but provides no further documentation on what the cards/transactions resource actually returns or what input it expects. The x402 challenge confirms the endpoint is live, accepting USDC (contract 0x8335…2913) on the Base network with a maximum amount of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). Payment is settled on-chain to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using the \"exact\" scheme.\n\nThe provider's landing page lists a broad catalog of API categories — data & analytics, AI & ML, 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 `/api/v1/cards/94/transactions` path does not appear in the advertised catalog, and no documentation pages returned meaningful content (all showed only \"Connect wallet\"). Without an OpenAPI spec, request/response schemas, or usage examples, it is unclear what data this endpoint provides or what POST body it expects. The \"cards/94/transactions\" path suggests it may relate to card transaction data or a financial/payment card resource, but this is speculative.","tags":[],"capabilities":["x402-payment","usdc-base-network","per-request-billing","no-api-key","post-endpoint"],"categories":["finance","payments"],"synonyms":["card transactions API","payment card data","x402 paid API","USDC micropayment endpoint","lowpaymentfee","Base network API","card transaction lookup"],"warnings":["No documentation available — all doc pages return only 'Connect wallet' with no content","The specific path /api/v1/cards/94/transactions does not appear in the provider's advertised API catalog","No request or response schema is available; input format is unknown","The purpose of this endpoint is unclear — 'Premium API Access' is a generic label"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/94/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/94/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 (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schema, and the specific endpoint path is not listed in the provider's own catalog. Effectively a stub 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'0.02':11,26,101,143 '000':96 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':114 '0x8335':84 '20':95 '2913':85 '6':104 'Base network API' 'USDC micropayment endpoint' 'accept':81 'access':55,155 'actual':66 'address':113 'advertis':166 'ai':133 'amount':93 'analyt':132 'api':54,129,148 'appear':163 'base':9,24,88,97 'behind':41 'bodi':200 'broad':126 'card':5,20,211,217 'card transaction lookup' 'card transactions API' 'card-transact':4,19 'cards/94/transactions':204 'cards/transactions':64 'catalog':127,167 'categori':130 'chain':111 'challeng':45,75 'confirm':76 'connect':178 'content':174 'contract':83 'data':131,193,213 'decim':105 'describ':50 'document':60,170 'endpoint':7,22,32,78,195 'equal':100 'exact':117 'exampl':188 'expect':72,202 'expos':35 'financ':135 'financial/payment':216 'gate':3,18 'howev':156 'infrastructur':138 'input':70 'instant':154 'key':149 'land':122 'limit':152 'list':124 'live':80 'lowpaymentfee' 'lowpaymentfee.com':34 'maximum':92 'may':208 'meaning':173 'ml':134 'network':89 'no-api-key' 'on-chain':109 'openapi':182 'page':123,171 'path':160,205 'pay':10,25 'payment':44,106 'payment card data' 'per':12,27,144 'per-request-billing' 'post':37,199 'post-endpoint' 'premium':53 'price':141 'provid':47,57,120,196 'rate':151 'relat':209 'request':13,28,145 'request/response':184 'resourc':38,65,218 'return':67,172 'schema':185 'scheme':118 'settl':108 'show':176 'site':49 'spec':183 'specif':158 'specul':222 'suggest':206 'transact':6,21,212 'unclear':191 'unit':98 'usag':187 'usdc':15,30,82,102 'usdc-base-network' 'use':103,115 'util':139 'wallet':179 'web3':136 'without':180 'x402':2,17,43,74 'x402 paid API' 'x402-gated':1,16 'x402-payment'","prices":[{"id":"8d82b14f-475c-4f0a-b1cd-3eb6d5a5fd29","listingId":"f3d97f41-d3c9-465f-b927-c663bc7963c7","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/94/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":"2026-04-18T18:44:03.103Z"}],"sources":[{"listingId":"f3d97f41-d3c9-465f-b927-c663bc7963c7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/94/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:03.103Z","lastSeenAt":"2026-04-24T15:02:20.768Z"}],"details":{"listingId":"f3d97f41-d3c9-465f-b927-c663bc7963c7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/94/transactions \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"x402 challenge returns maxAmountRequired of 20000 in USDC (6 decimals) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/cards/94/transactions"},{"claim":"Provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/94/transactions"}],"useCases":["Retrieving or submitting card transaction data via a pay-per-call model","Integrating x402-gated financial endpoints into agent workflows","Accessing premium card-related data without traditional API key provisioning"],"bestFor":["Developers experimenting with x402 payment protocol on Base","Agents that can settle USDC micropayments for per-call API access","Use cases requiring keyless, on-demand API access"],"notFor":["Production use requiring documented request/response schemas","High-volume use cases where per-call pricing may add up without volume discounts","Users who need clear documentation before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.493Z"},"updatedAt":"2026-04-24T15:02:20.768Z"}}