{"id":"71e8c084-79fd-4f5f-a979-c44f3196f95e","shortId":"YqwE8r","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, settling payments in USDC on the Base network. The specific resource path (`/api/v1/stripe/subscriptions/191`) suggests a subscription-related API endpoint, though the x402 challenge uses the \"exact\" (one-shot) payment scheme rather than a recurring subscription model.\n\nThe endpoint is live and returns a standard x402 challenge. The maximum amount required is 20,000 base units of USDC (which uses 6 decimals), equating to $0.02 per request. The broader lowpaymentfee.com platform advertises a uniform $0.02/request pricing across multiple API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. The platform emphasizes no API keys, no rate limits, and instant access.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed description of what this specific endpoint returns. The endpoint accepts POST requests and returns application/json, but the actual payload structure and response format are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-call-pricing","json-response","post-method"],"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 OpenAPI schema or endpoint documentation available","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content","The actual functionality of this specific endpoint (/api/v1/stripe/subscriptions/191) is unclear","No request body schema or response format documented","The path suggests Stripe subscription management but no details confirm this"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/191","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/191","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is virtually no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the endpoint actually does beyond the generic label \"Premium API Access\". The docs pages are empty wallet-connect 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'/request':117 '0.02':106,116 '000':95 '20':94 '6':102 'Base network API' 'USDC API access' 'accept':188 'access':6,20,36,145 'across':119 'actual':196 'advertis':113 'ai':126 'amount':91 'analyt':125 'api':5,19,35,59,121,138,152 'application/json':193 'base':8,22,47,96 'base-network' 'behind':37 'broader':110 'call':12,26 'categori':122 'challeng':64,88 'connect':161 'content':167 'crypto-paid API' 'data':124 'decim':103 'descript':179 'detail':178 'doc':151 'document':146 'emphas':136 'endpoint':30,60,80,184,187 'equat':104 'exact':67 'exampl':175 'extrem':148 'financ':129 'format':201 'gate':3,17 'includ':123 'infrastructur':132 'instant':144 'json-response' 'key':139 'learn':128 'limit':142 'live':82 'lowpaymentfee' 'lowpaymentfee.com':32,111 'machin':127 'maximum':90 'micropayment API' 'model':78 'multipl':120 'network':48 'one':69 'one-shot':68 'openapi':171 'page':156 'paid':9,23 'path':52 'pay-per-call API' 'payload':197 'payment':42,71 'paywal':40 'per':11,25,107 'per-cal':10,24 'per-call-pricing' 'platform':112,135 'post':189 'post-method' 'premium':4,18,34 'price':118,153 'prompt':163 'provid':33 'rate':141 'rather':73 'readm':155 'recur':76 'relat':58 'render':158 'request':108,190 'request/response':174 'requir':92 'resourc':51 'respons':200 'return':84,185,192 'schema':172 'scheme':72 'settl':41 'shot':70 'spars':149 'specif':50,183 'standard':86 'structur':198 'subscript':57,77 'subscription-rel':56 'substant':166 'suggest':54 'though':61 'uniform':115 'unit':97 'unknown':203 'usdc':14,28,44,99 'usdc-settlement' 'use':65,101 'util':133 'wallet':162 'web3':130 'x402':2,16,39,63,87 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"eb778782-c13c-4ace-8462-93e5e948f783","listingId":"71e8c084-79fd-4f5f-a979-c44f3196f95e","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/191","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:37.317Z"}],"sources":[{"listingId":"71e8c084-79fd-4f5f-a979-c44f3196f95e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/191","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:37.317Z","lastSeenAt":"2026-04-22T15:02:03.592Z"}],"details":{"listingId":"71e8c084-79fd-4f5f-a979-c44f3196f95e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/191 \\\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 endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/191"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/191"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments","Agent-driven API consumption without API key management","Testing x402 payment flows on Base network"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-call API access","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation before integrating","Production workloads requiring SLA guarantees or support","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:49.145Z"},"updatedAt":"2026-04-22T15:02:03.592Z"}}