{"id":"075fb7e8-8791-4abb-b5b6-5c1a77ce57ae","shortId":"rcVFda","kind":"x402","title":"x402-gated card-transactions endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated card-transactions endpoint on Base, pay-per-call with USDC.","description":"This endpoint at lowpaymentfee.com exposes a card transactions resource at `/api/v1/cards/51/transactions` behind an x402 paywall. It accepts POST requests and is settled on the Base network using USDC (contract 0x8335…2913). The per-request cost is $0.02 (20,000 base units of USDC with 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform advertises a wide catalog of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request. However, this specific listing covers only the `/api/v1/cards/51/transactions` endpoint, whose exact response payload and business logic are undocumented — the site's docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further detail.\n\nBecause there is no OpenAPI schema, no example request/response bodies, and no documentation beyond the landing page's brief catalog listing, the actual data returned by this endpoint is unknown. The endpoint is confirmed live (returns a proper 402 challenge), but callers should be aware that the functionality behind this particular path is opaque.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","card-transactions","post-method"],"categories":["finance","payments"],"synonyms":["card transactions API","x402 API","USDC pay-per-call","Base network API","lowpaymentfee","card data endpoint","micropayment API"],"warnings":["No documentation available — docs, pricing, and API pages render only 'Connect wallet' with no content.","The specific path /api/v1/cards/51/transactions is not listed in the site's own API catalog, raising questions about its purpose.","No request or response schema is provided; callers cannot know what data to send or expect back.","The broader site lists many diverse API categories (AI, finance, geocoding, etc.) all at the same price, which may indicate placeholder/demo endpoints rather than production services."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/51/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/51/transactions","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and no documentation explaining what the endpoint actually returns. The docs, pricing, and API pages are all blank beyond a wallet-connect prompt. The specific resource path (/cards/51/transactions) is not mentioned anywhere in the site's own catalog, making it unclear whether this is a real production endpoint or a demo 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'0.02':68,145 '000':70 '0x8335':60 '20':69 '2913':61 '402':223 '6':76 'Base network API' 'USDC pay-per-call' 'accept':47 'actual':207 'advertis':104 'ai/ml':117 'analysi':120 'analyt':116 'api':79,113,172 'attach':88 'awar':229 'base':9,24,55,71 'base-network' 'behind':42,233 'beyond':198 'bodi':194 'brief':203 'broader':101 'busi':162 'call':13,28,112 'caller':86,226 'card':5,20,37 'card data endpoint' 'card transactions API' 'card-transact':4,19 'card-transactions' 'catalog':107,204 'challeng':224 'classif':122 'confirm':218 'connect':178 'contract':59 'convers':138 'cost':66 'cover':152 'data':115,208 'decim':77 'detail':184 'doc':169 'document':197 'embed':123 'endpoint':7,22,32,141,156,212,216 'estim':132 'exact':158 'exampl':192 'exchang':127 'expos':35 'feed':126 'finance/web3':124 'function':232 'gas':131 'gate':3,18 'generat':139 'geocod':136 'header':93 'howev':148 'infer':118 'infrastructur':134 'key':80 'land':200 'limit':83 'list':143,151,205 'live':219 'logic':163 'lowpaymentfee' 'lowpaymentfee.com':34,102 'micropayment API' 'network':56 'opaqu':238 'openapi':189 'page':173,201 'particular':235 'path':236 'pay':11,26,110 'pay-per-cal':10,25,109 'pay-per-call' 'payload':160 'payment':92,98 'paywal':45 'per':12,27,64,111,146 'per-request':63 'platform':103 'post':48 'post-method' 'price':125,170 'prompt':180 'proof':99 'proper':222 'quot':130 'rate':82,128 'render':175 'request':49,65,147 'request/response':193 'requir':85 'resourc':39 'respons':159 'return':209,220 'schema':190 'sentiment':119 'settl':52 'simpli':87 'site':167 'span':114 'specif':150 'summar':121 'token':129 'transact':6,21,38 'undocu':165 'unit':72 'unknown':214 'usdc':15,30,58,74 'usdc-settlement' 'use':57 'util':135 'valid':96,137 'wallet':179 'whose':157 'wide':106 'x':91 'x-payment':90 'x402':2,17,44,97 'x402 API' 'x402-gated':1,16 'x402-payment'","prices":[{"id":"90b88f44-9169-4676-897f-1bf07c6a1ac5","listingId":"075fb7e8-8791-4abb-b5b6-5c1a77ce57ae","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/51/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":"2026-04-18T18:43:37.590Z"}],"sources":[{"listingId":"075fb7e8-8791-4abb-b5b6-5c1a77ce57ae","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/51/transactions","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:37.590Z","lastSeenAt":"2026-04-24T18:32:22.477Z"}],"details":{"listingId":"075fb7e8-8791-4abb-b5b6-5c1a77ce57ae","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/51/transactions \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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 x402Version 1, accepting USDC on Base network with maxAmountRequired of 20000 base units.","source_url":"https://lowpaymentfee.com/api/v1/cards/51/transactions"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.","source_url":"https://lowpaymentfee.com/api/v1/cards/51/transactions"},{"claim":"The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The docs, pricing, API, and README pages all render only a 'Connect wallet' prompt with no additional content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving transaction data for a specific card via a single paid POST call","Integrating card transaction lookups into an agent workflow without API key management","Programmatic access to card transaction records settled via on-chain USDC micropayments"],"bestFor":["Agents that can settle x402 payments in USDC on Base","Developers wanting keyless, pay-per-use card transaction data","Workflows requiring low-friction, no-subscription API access"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before integrating","High-volume batch processing where $0.02/request adds up quickly","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.86Z"},"updatedAt":"2026-04-24T18:32:22.477Z"}}