{"id":"414cb8d7-0f29-4d2f-8cd1-fb67a4840a5f","shortId":"Zu5x4a","kind":"x402","title":"x402-gated premium API access on Base, paid per-call in USDC.","tagline":"x402-gated premium API access on Base, paid per-call in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall. The specific endpoint path (`/api/v1/stripe/subscriptions/95`) suggests a subscription-tier resource, though the crawled site primarily advertises a flat per-request pricing model across many API categories. The endpoint is live and returns a valid x402 challenge requesting payment in USDC on the Base network.\n\nThe x402 challenge specifies a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this converts to $0.02 per request, consistent with the site's advertised pricing of $0.02/request across all endpoints. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader lowpaymentfee.com platform lists endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure (geocoding, validation, conversion, generation). All are priced at $0.02/request with no API keys, no rate limits, and no commitments. However, the specific functionality behind this particular subscription endpoint is not documented in the crawled material, and the docs/pricing/API pages all returned only a \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-billing","premium-api-access","no-api-key","http-post"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC API access","Base network API","lowpaymentfee","micropayment API","crypto-paid API"],"warnings":["No documentation available for what this endpoint returns after successful payment","Docs, pricing, and API pages all render only a 'Connect wallet' prompt with no content","The endpoint path references 'stripe/subscriptions' which is unusual for a crypto-settled x402 endpoint — actual behavior is unclear","No OpenAPI schema or input/output examples available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/95","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/stripe/subscriptions/95","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is live with a valid x402 challenge and clear pricing ($0.02 USDC on Base), but there is no documentation of what this specific endpoint returns upon successful payment. The docs, pricing, and API pages are all blank beyond a wallet-connect prompt. The endpoint path suggests subscription functionality but no schema or examples 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'/request':125,185 '0.02':113,124,184 '000':96 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':134 '0x8335':101 '20':95 '2913':102 '300':137 '6':108 'Base network API' 'USDC API access' 'access':6,20,36 'across':65,126,146 'addit':225 'address':133 'advertis':57,121 'ai':156 'amount':93 'analysi':160 'analyt':150 'api':5,19,35,67,188 'base':8,22,85,97,104 'behind':37,200 'broader':141 'call':12,26 'categori':68,148 'challeng':78,89 'classif':162 'commit':195 'connect':220 'consist':116 'content':226 'convers':178 'convert':111 'crawl':54,210 'crypto-paid API' 'data':149,153 'decim':109 'docs/pricing/api':214 'document':207 'embed':163 'endpoint':30,43,70,128,145,204 'estim':173 'exchang':168 'export':154 'feed':167 'financ':164 'flat':59 'four':147 'function':199 'gas':172 'gate':3,17 'generat':179 'geocod':176 'howev':196 'http-post' 'infrastructur':175 'insight':155 'key':189 'learn':158 'limit':192 'list':144 'live':72 'lowpaymentfee' 'lowpaymentfee.com':32,142 'machin':157 'mani':66 'materi':211 'maximum':92 'metric':151 'micropayment API' 'model':64 'network':86 'no-api-key' 'page':215 'paid':9,23 'particular':202 'path':44 'pay-per-call API' 'payment':80,129 'paywal':40 'per':11,25,61,114 'per-cal':10,24 'per-request':60 'per-request-billing' 'platform':143 'premium':4,18,34 'premium-api-access' 'price':63,122,166,182 'primarili':56 'prompt':222 'provid':33 'quot':171 'rate':169,191 'report':152 'request':62,79,115 'resourc':51 'return':74,217 'second':138 'sent':131 'sentiment':159 'sinc':105 'site':55,119 'specif':42,198 'specifi':90 'subscript':49,203 'subscription-ti':48 'suggest':46 'summar':161 'though':52 'tier':50 'timeout':139 'token':170 'unit':98 'usdc':14,28,82,100,106 'usdc-base' 'use':107 'valid':76,177 'wallet':221 'web3':165 'x402':2,16,39,77,88 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"d11d2d4c-2178-48f1-9d4f-27a85e94d805","listingId":"414cb8d7-0f29-4d2f-8cd1-fb67a4840a5f","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/stripe/subscriptions/95","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:59.085Z"}],"sources":[{"listingId":"414cb8d7-0f29-4d2f-8cd1-fb67a4840a5f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/95","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:59.085Z","lastSeenAt":"2026-04-22T09:01:35.457Z"}],"details":{"listingId":"414cb8d7-0f29-4d2f-8cd1-fb67a4840a5f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/95\n# Returns 402 with x402 challenge; attach X-PAYMENT header with USDC payment proof on Base to access.","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/stripe/subscriptions/95","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 x402 challenge requests 20,000 base units of USDC (=$0.02) on Base network with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/95"},{"claim":"The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/95"}],"useCases":["Accessing premium API resources with per-call USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic subscription or premium-tier resource retrieval"],"bestFor":["Developers wanting no-signup, pay-per-request API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over traditional API key subscriptions"],"notFor":["Users who need detailed API documentation before integrating","Applications requiring free or fiat-only payment methods","High-volume use cases where $0.02/request adds up significantly"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:48.14Z"},"updatedAt":"2026-04-22T09:01:35.457Z"}}