{"id":"90c5cd24-9007-4424-9dbc-3e2654640bae","shortId":"kWYhnu","kind":"x402","title":"Premium API Access subscription endpoint on Base via x402, paid in USDC.","tagline":"Premium API Access subscription endpoint on Base via x402, paid in USDC.","description":"This endpoint at lowpaymentfee.com provides a \"Premium API Access\" subscription resource via the x402 payment protocol. It accepts POST requests and settles payments in USDC on the Base network. The x402 challenge indicates a maximum amount of 20,000 base units of USDC (6 decimals), which equals $0.02 per request.\n\nThe broader lowpaymentfee.com platform offers a suite of pay-per-call APIs spanning 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 advertised at $0.02 per request with no API keys, no rate limits, and instant access via the Base network.\n\nThis specific endpoint (/api/v1/stripe/subscriptions/81) appears to be a subscription-related resource, though the exact response payload and subscription mechanics are not documented. The endpoint is live and returns a valid x402 challenge. No OpenAPI schema, detailed documentation, or example responses were found in the crawl.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","subscription-management","no-api-key"],"categories":["payments","infrastructure"],"synonyms":["premium access","subscription API","x402 subscription","USDC payment endpoint","pay-per-call API","Base network API","lowpaymentfee"],"warnings":["No OpenAPI or request/response schema available","Documentation pages return only 'Connect wallet' with no useful content","Exact behavior and response payload of the subscription endpoint are undocumented","The endpoint path includes 'stripe/subscriptions' but settles via x402/USDC — the relationship to Stripe is unclear"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/81","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/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no OpenAPI schema, no documented request/response format, and the crawled docs pages are empty stubs ('Connect wallet'). The purpose of this specific subscription endpoint is unclear beyond its 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'0.02':72,127 '000':63 '20':62 '6':68 'Base network API' 'USDC payment endpoint' 'accept':42 'access':3,15,33,139 'advertis':125 'ai':96 'amount':60 'analysi':100 'analyt':90 'api':2,14,32,87,132 'appear':148 'base':7,19,52,64,142 'base-network' 'broader':76 'call':86 'challeng':56,176 'classif':103 'convers':120 'crawl':189 'data':89,93 'decim':69 'detail':180 'document':166,181 'embed':104 'endpoint':5,17,26,123,146,168 'equal':71 'estim':114 'exact':158 'exampl':183 'exchang':109 'export':94 'feed':108 'financ':105 'found':186 'gas':113 'generat':121 'geocod':118 'indic':57 'infrastructur':116 'insight':95 'instant':138 'key':133 'learn':98 'limit':136 'live':170 'lowpaymentfee' 'lowpaymentfee.com':28,77 'machin':97 'maximum':59 'mechan':163 'metric':91 'network':53,143 'no-api-key' 'offer':79 'openapi':178 'paid':10,22 'pay':84 'pay-per-cal':83 'pay-per-call API' 'pay-per-request' 'payload':160 'payment':39,47 'per':73,85,128 'platform':78 'post':43 'premium':1,13,31 'premium access' 'price':107 'protocol':40 'provid':29 'quot':112 'rate':110,135 'relat':154 'report':92 'request':44,74,129 'resourc':35,155 'respons':159,184 'return':172 'schema':179 'sentiment':99 'settl':46 'span':88 'specif':145 'subscript':4,16,34,153,162 'subscription API' 'subscription-management' 'subscription-rel':152 'suit':81 'summar':102 'text':101 'though':156 'token':111 'unit':65 'usdc':12,24,49,67 'usdc-settlement' 'util':117 'valid':119,174 'via':8,20,36,140 'web3':106 'x402':9,21,38,55,175 'x402 subscription' 'x402-payment'","prices":[{"id":"94166f5c-b2ff-451e-94dc-6454a0a2e418","listingId":"90c5cd24-9007-4424-9dbc-3e2654640bae","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/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:00.260Z"}],"sources":[{"listingId":"90c5cd24-9007-4424-9dbc-3e2654640bae","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/81","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:00.260Z","lastSeenAt":"2026-04-22T09:01:35.513Z"}],"details":{"listingId":"90c5cd24-9007-4424-9dbc-3e2654640bae","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/81 \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/81"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/81"}],"useCases":["Purchasing premium API access via a single x402 micropayment","Programmatic subscription activation without traditional API keys","Agent-driven access to gated resources using on-chain USDC payments"],"bestFor":["Developers wanting keyless, pay-per-use API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over traditional billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","Applications requiring fiat-only payment rails","High-volume use cases where per-request pricing may not be cost-effective compared to bulk plans"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:48.092Z"},"updatedAt":"2026-04-22T09:01:35.513Z"}}