{"id":"bcc28e49-4ec8-4064-adc1-c7865108d171","shortId":"d4RMhS","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 pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints on the platform use the x402 protocol on the Base network, settling payments in USDC.\n\nThe specific endpoint `/api/v1/stripe/subscriptions/104` is labeled \"Premium API Access\" in the x402 challenge. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD. The endpoint accepts POST requests and returns application/json responses. Payment is made via the x402 \"exact\" scheme to the specified wallet address on Base.\n\nNotably, the platform advertises no API keys, no rate limits, and instant access — the only gate is the per-request x402 micropayment. However, documentation 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 description of what \"Premium API Access\" actually returns or what input parameters it expects. The endpoint name suggests it may relate to Stripe subscription management, but this is speculative based solely on the URL path.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-request-pricing","json-response","post-method"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","lowpaymentfee","premium API","Base network API","crypto-gated API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","No OpenAPI or input/output schema provided; it is unknown what this endpoint actually returns.","The endpoint's purpose is unclear — 'Premium API Access' is a generic label and the URL path referencing 'stripe/subscriptions' is unexplained.","No request or response examples exist in any crawled material."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/104","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/104","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, no description of what the endpoint actually does or what inputs it expects. The docs pages are empty beyond a wallet-connect prompt. The endpoint name ('Premium API Access') and URL path ('/stripe/subscriptions/104') are 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'0.02':121 '000':112 '20':111 '6':117 'Base network API' 'USDC micropayment endpoint' 'accept':125 'access':6,20,36,99,159,208 'actual':209 'address':144 'advertis':150 'ai':66 'amount':106 'analyt':65 'api':5,19,35,62,98,152,177,207 'application/json':130 'base':8,22,85,113,146,232 'base-network' 'call':12,26,109 'challeng':103 'connect':186 'content':192 'crypto-gated API' 'data':64 'decim':118 'descript':203 'doc':176 'document':171 'endpoint':30,47,75,93,124,218 'equal':120 'exact':138 'exampl':200 'expect':216 'extrem':173 'financ':69 'gate':3,17,162 'host':54 'howev':170 'infrastructur':72 'input':213 'instant':158 'json-response' 'key':153 'label':96 'learn':68 'limit':156 'lowpaymentfee' 'lowpaymentfee.com':32,51 'machin':67 'made':134 'manag':227 'mani':46 'maximum':105 'may':222 'micropay':169 'name':219 'network':86 'notabl':147 'offer':48 'one':44 'openapi':196 'page':181 'paid':9,23 'paramet':214 'path':237 'pay':59 'pay-per-call API' 'pay-per-request':58 'payment':40,88,132 'per':11,25,60,108,166 'per-cal':10,24 'per-request':165 'per-request-pricing' 'platform':52,78,149 'post':126 'post-method' 'premium':4,18,34,97,206 'premium API' 'price':178 'prompt':188 'protocol':41,82 'provid':33 'rate':155 'readm':180 'relat':223 'render':183 'request':61,127,167 'request/response':199 'requir':107 'respons':131 'return':129,210 'schema':197 'scheme':139 'settl':87 'sole':233 'span':63 'spars':174 'specif':92 'specifi':142 'specul':231 'stripe':225 'subscript':226 'substant':191 'suggest':220 'unit':114 'url':236 'usd':122 'usdc':14,28,90,116 'usdc-settlement' 'use':79 'util':73 'varieti':56 'via':37,135 'wallet':143,187 'web3':70 'x402':2,16,39,81,102,137,168 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"92a449e0-e586-4e76-94f5-af11c364a244","listingId":"bcc28e49-4ec8-4064-adc1-c7865108d171","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/104","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:11.493Z"}],"sources":[{"listingId":"bcc28e49-4ec8-4064-adc1-c7865108d171","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/104","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:11.493Z","lastSeenAt":"2026-04-22T19:32:02.975Z"}],"details":{"listingId":"bcc28e49-4ec8-4064-adc1-c7865108d171","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/104\n# Returns 402 with x402 challenge; attach X-PAYMENT header with valid payment proof to access.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network.","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/104"},{"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 network.","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/104"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no substantive content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing a premium API service with per-request USDC micropayments on Base","Integrating x402-compatible agent workflows that pay per call without API keys","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-per-call API access on Base","Projects wanting to avoid subscription commitments for API usage"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring known, well-documented request/response schemas","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:50.368Z"},"updatedAt":"2026-04-22T19:32:02.975Z"}}