{"id":"5ca22982-946a-4e9c-b9bf-a9f6eee4da1d","shortId":"yEgyxD","kind":"x402","title":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com offers a collection of pay-per-call API endpoints gated via the x402 protocol on the Base network. The specific endpoint `/api/v1/cards/41` is listed as \"Premium API Access\" and accepts payment in USDC (contract 0x8335…2913 on Base). The x402 challenge indicates a maxAmountRequired of 20,000 base units, which at 6 decimals for USDC equals $0.02 per request.\n\nThe broader platform advertises four categories of endpoints: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text 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 with no API keys, no rate limits, and no minimum commitments.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is confirmed live (returns 402 with a valid x402 challenge), but without documentation it is unclear what request body `/api/v1/cards/41` expects or what it returns.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base network api","usdc api access","premium api access"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet'","No OpenAPI or schema definition; request body format and response structure for /api/v1/cards/41 are unknown","The specific purpose of the /api/v1/cards/41 endpoint is unclear — 'Premium API Access' is a generic label","Cannot verify what data or functionality this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/41","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/41","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 x402 challenge and clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response examples, and the purpose of /api/v1/cards/41 specifically is entirely opaque. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/api/v1/cards/41':56,212 '/docs':159 '/pricing':161 '/readme':163 '/request':16,32 '0.02':15,31,91,140 '000':81 '0x8335':69 '20':80 '2913':70 '402':197 '6':86 'accept':64 'access':62 'advertis':97 'ai':9,25,109 'ai-inference' 'analysi':113 'analyt':8,24,103 'api':4,20,42,61,145 'avail':190 'base':7,23,51,72,82 'base network api' 'bodi':211 'broader':95 'call':41 'categori':99 'challeng':75,202 'classif':116 'classification' 'collect':36 'commit':153 'confirm':194 'connect':169 'contract':68 'convers':133 'data':102,106 'data-analytics' 'decim':87 'detail':176 'document':154,185,205 'embed':117 'embeddings' 'endpoint':13,29,43,55,101,136,192 'equal':90 'estim':127 'exampl':188 'exchang':122 'expect':213 'export':107 'extrem':156 'feed':121 'financ':10,26,118 'finance-data' 'four':98 'gas':126 'gate':3,19,44 'generat':134 'geocod':131 'geocoding' 'indic':76 'infrastructur':129 'insight':108 'key':146 'learn':111 'limit':149 'list':58,138 'live':195 'low payment fee' 'lowpaymentfee.com':33 'machin':110 'maxamountrequir':78 'metric':104 'micropayment api' 'minimum':152 'network':52 'no-api-key' 'offer':34 'openapi':180 'page':164 'pay':39 'pay per call api' 'pay-per-cal':38 'pay-per-request' 'payload':189 'payment':65 'per':40,92,141 'platform':96 'premium':60 'premium api access' 'price':120 'prompt':171 'protocol':48 'quot':125 'rate':123,148 'render':166 'report':105 'request':93,142,210 'request/response':183 'return':196,217 'schema':184 'sentiment':112 'sentiment-analysis' 'spars':157 'spec':181 'specif':54 'suit':5,21 'summar':115 'technic':175 'text':114 'text-summarization' 'token':124 'unclear':208 'unit':83 'usdc':67,89 'usdc api access' 'usdc-base' 'util':12,28,130 'utility-apis' 'valid':132,200 'via':45 'wallet':170 'web3':119 'without':204 'x402':2,18,47,74,201 'x402 api' 'x402-gated':1,17 'x402-payment'","prices":[{"id":"0e451ece-6741-442b-8b44-e3be636a4ce2","listingId":"5ca22982-946a-4e9c-b9bf-a9f6eee4da1d","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/41","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:32.820Z"}],"sources":[{"listingId":"5ca22982-946a-4e9c-b9bf-a9f6eee4da1d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/41","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:32.820Z","lastSeenAt":"2026-04-23T04:31:07.564Z"}],"details":{"listingId":"5ca22982-946a-4e9c-b9bf-a9f6eee4da1d","quickStartSnippet":"# The endpoint requires an x402 X-PAYMENT header with USDC on Base.\n# Use an x402-compatible client to handle payment automatically.\ncurl -X POST https://lowpaymentfee.com/api/v1/cards/41 \\\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 x402 challenge returns maxAmountRequired of 20000 base units in USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/41"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-call for AI inference (sentiment, summarization, classification, embeddings) without subscriptions","Fetching real-time financial data like token quotes, exchange rates, and gas estimates","Running utility operations like geocoding, validation, and data conversion on demand","Accessing analytics metrics and reports with crypto micropayments"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access via crypto","Agents that can settle x402 payments in USDC on Base","Projects needing lightweight API calls without API key management"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume production workloads that need SLAs, rate-limit guarantees, or support contracts","Developers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.978Z"},"updatedAt":"2026-04-23T04:31:07.564Z"}}