{"id":"33e8441e-1254-4992-b2f1-68a3f4ea8e95","shortId":"pC8AmX","kind":"x402","title":"x402-gated premium API access on Base, paid per-request in USDC.","tagline":"x402-gated premium API access on Base, paid per-request 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/13` is labeled \"Premium API Access\" and requires a payment of up to 20,000 base units of USDC (0.02 USD) per request, consistent with the platform's uniform $0.02/request pricing. The x402 challenge confirms the endpoint is live, accepting POST requests, and settling payments to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base using the USDC contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`.\n\nHowever, the actual functionality behind this \"Premium API Access\" endpoint is unclear. The URL path suggests it may relate to Stripe subscription management, but no documentation, request/response schema, or usage 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 this endpoint returns or what input it expects, agents should treat it as an opaque paid endpoint until more documentation surfaces.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-request-billing","no-api-key","post-method"],"categories":["api-gateway","payments"],"synonyms":["premium API","x402 API","pay-per-request API","USDC API access","lowpaymentfee","Base network API","crypto-paid API"],"warnings":["No documentation available — docs, pricing, and API pages all show only 'Connect wallet' with no content.","The actual functionality of this endpoint is unknown; the 'Premium API Access' label and '/stripe/subscriptions/13' path are not explained anywhere.","No request or response schema is provided, making integration risky without trial-and-error.","The endpoint path references 'stripe/subscriptions' which may imply subscription management, but this is unconfirmed."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/13","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/13","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 with clear pricing, but there is no documentation, no request/response schema, and no explanation of what 'Premium API Access' actually provides. The docs pages are empty beyond a wallet connect prompt. This is effectively a stub 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'/request':129 '0.02':118,128 '000':113 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':147 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':154 '20':112 'Base network API' 'USDC API access' 'accept':139 'access':6,20,36,104,163 'actual':157 'address':146 'agent':218 'ai':63 'analyt':62 'api':5,19,35,58,83,103,162,194 'avail':187 'base':8,22,92,114,149 'base-network' 'behind':159 'categori':59 'challeng':133 'confirm':134 'connect':200 'consist':122 'content':206 'contract':153 'crypto-paid API' 'data':61 'doc':191 'document':180,229 'endpoint':30,47,72,98,136,164,211,226 'exampl':185 'expect':217 'financ':66 'function':158 'gate':3,17 'host':54 'howev':155 'includ':60 'infrastructur':69 'input':215 'key':84 'know':208 'label':101 'learn':65 'limit':87 'live':138 'lowpaymentfee' 'lowpaymentfee.com':32,51 'machin':64 'manag':177 'mani':46 'may':172 'network':93 'no-api-key' 'offer':48 'one':44 'opaqu':224 'page':195 'paid':9,23,225 'path':169 'pay':78 'pay-per-request':77 'pay-per-request API' 'payment':40,108,144 'per':11,25,79,120 'per-request':10,24 'per-request-billing' 'platform':52,75,125,189 'post':140 'post-method' 'premium':4,18,34,102,161 'premium API' 'price':130,192 'prompt':202 'protocol':41 'provid':33 'rate':86 'relat':173 'render':197 'request':12,26,80,121,141 'request/response':181 'requir':106 'return':212 'schema':182 'settl':143 'settlement':89 'specif':97 'stripe':175 'subscript':176 'suggest':170 'surfac':230 'treat':220 'unclear':166 'uniform':127 'unit':115 'url':168 'usag':184 'usd':119 'usdc':14,28,95,117,152 'usdc-settlement' 'use':94,150 'util':70 'varieti':56 'via':37 'wallet':201 'web3':67 'without':207 'x402':2,16,39,132 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"8a6fce4f-b09a-4607-84c8-d300496ad3ea","listingId":"33e8441e-1254-4992-b2f1-68a3f4ea8e95","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/13","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:27.699Z"}],"sources":[{"listingId":"33e8441e-1254-4992-b2f1-68a3f4ea8e95","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/13","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:27.699Z","lastSeenAt":"2026-04-22T16:31:56.046Z"}],"details":{"listingId":"33e8441e-1254-4992-b2f1-68a3f4ea8e95","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/13 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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/13"},{"claim":"The platform 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 contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/13"},{"claim":"Docs, pricing, and API pages render only a 'Connect wallet' prompt with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing a premium API resource with per-call USDC micropayments on Base","Integrating x402-compatible agents with paid endpoints without API key management","Testing x402 payment flows against a live, low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol integrations","Agents that need keyless, pay-per-call API access on Base","Low-cost micropayment API testing"],"notFor":["Users who need clear documentation on request/response schemas before integrating","Production workloads requiring well-documented, stable API contracts","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:49.624Z"},"updatedAt":"2026-04-22T16:31:56.046Z"}}