{"id":"5403897e-87ac-49f5-8662-36f21a47cd20","shortId":"4CJXru","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\" via the x402 payment protocol. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a variety of API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. All endpoints on the platform are pay-per-request with no API keys, no rate limits, and settlement on the Base network using USDC.\n\nThe specific endpoint `/api/v1/stripe/subscriptions/108` is labeled \"Premium API Access\" and returns a valid x402 challenge requiring up to 0.02 USDC (20,000 base units with 6 decimals) per POST request. The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base, using the USDC contract at `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`. The challenge uses the \"exact\" scheme with a 300-second timeout.\n\nHowever, the actual functionality behind this specific endpoint is unclear. The name \"Premium API Access\" and the path segment \"stripe/subscriptions\" suggest it may relate to subscription management or Stripe integration, but no documentation, request/response schema, or examples are available. The platform's docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content. Without knowing what data or service this endpoint returns upon successful payment, its practical utility is difficult to assess.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-request-pricing","no-api-key","post-endpoint"],"categories":["api-gateway","payments"],"synonyms":["lowpaymentfee","x402 API","pay-per-call API","USDC API access","Base network API","micropayment API","stripe subscription API"],"warnings":["No documentation available — docs, pricing, API, and README pages all render only a 'Connect wallet' prompt with no content.","The actual functionality of this specific endpoint (/api/v1/stripe/subscriptions/108) is unknown; the 'Premium API Access' label is vague.","No request or response schema is provided; callers cannot know what to send or what to expect back.","The path includes 'stripe/subscriptions' which may imply Stripe-related functionality, but this is unconfirmed.","This endpoint does not appear in the platform's own listed API catalog on the homepage."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/108","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/108","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no request/response schema, and no explanation of what the endpoint actually does beyond the generic label \"Premium API Access\". The docs and other pages are empty (just wallet connect prompts). This is effectively a stub 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'0.02':114 '000':117 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':132 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':140 '20':116 '300':149 '6':121 'Base network API' 'USDC API access' 'access':6,20,36,104,166 'actual':154 'address':131 'ai':63 'analyt':62 'api':5,19,35,58,83,103,165,197 'assess':228 'avail':190 'base':8,22,92,118,134 'base-network' 'behind':156 'call':12,26 'categori':59 'challeng':110,142 'connect':203 'content':209 'contract':138 'data':61,213 'decim':122 'difficult':226 'doc':194 'document':184 'endpoint':30,47,72,98,159,217 'exact':145 'exampl':188 'financ':66 'function':155 'gate':3,17 'host':54 'howev':152 'includ':60 'infrastructur':69 'integr':181 'key':84 'know':211 'label':101 'learn':65 'limit':87 'lowpaymentfee' 'lowpaymentfee.com':32,51 'machin':64 'manag':178 'mani':46 'may':174 'micropayment API' 'name':163 'network':93 'no-api-key' 'offer':48 'one':44 'page':198 'paid':9,23 'path':169 'pay':78 'pay-per-call API' 'pay-per-request':77 'payment':40,127,221 'per':11,25,79,123 'per-cal':10,24 'per-request-pricing' 'platform':52,75,192 'post':124 'post-endpoint' 'practic':223 'premium':4,18,34,102,164 'price':195 'prompt':205 'protocol':41 'provid':33 'rate':86 'relat':175 'render':200 'request':80,125 'request/response':185 'requir':111 'return':106,218 'schema':186 'scheme':146 'second':150 'segment':170 'sent':129 'servic':215 'settlement':89 'specif':97,158 'stripe':180 'stripe subscription API' 'stripe/subscriptions':171 'subscript':177 'success':220 'suggest':172 'timeout':151 'unclear':161 'unit':119 'upon':219 'usdc':14,28,95,115,137 'usdc-settlement' 'use':94,135,143 'util':70,224 'valid':108 'varieti':56 'via':37 'wallet':204 'web3':67 'without':210 'x402':2,16,39,109 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"ca57154e-ff83-4170-9590-3bdc021527e6","listingId":"5403897e-87ac-49f5-8662-36f21a47cd20","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/108","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:16.815Z"}],"sources":[{"listingId":"5403897e-87ac-49f5-8662-36f21a47cd20","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/108","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:16.815Z","lastSeenAt":"2026-04-22T20:01:29.912Z"}],"details":{"listingId":"5403897e-87ac-49f5-8662-36f21a47cd20","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/108 \\\n  -H \"Content-Type: application/json\"\n# Returns 402 with x402 payment challenge; attach X-PAYMENT header with signed USDC payment to access.","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/108"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/108"},{"claim":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API service with per-call USDC micropayments","Agent-driven API consumption without pre-registration or API keys","Exploring x402 payment protocol integration on Base"],"bestFor":["Developers experimenting with x402 payment flows","Agents that need keyless, pay-per-use API access on Base","Projects requiring USDC-settled micropayment APIs"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Applications requiring known, well-documented response schemas","High-volume use cases where subscription pricing would be more economical"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:50.083Z"},"updatedAt":"2026-04-22T20:01:29.912Z"}}