{"id":"4d99b3e8-ee39-4f0c-a28e-4bf69e970ab4","shortId":"gLhT5T","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 gated behind x402 payment challenges settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/stripe/subscriptions/186` is labeled \"Premium API Access\" in the x402 challenge. The maximum amount required is 20,000 base units of USDC (which uses 6 decimals), equating to $0.02 per request. The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. The endpoint accepts POST requests and returns `application/json` responses. The x402 challenge timeout is 300 seconds.\n\nDocumentation on the platform is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what \"Premium API Access\" actually returns or what input it expects beyond a POST body. The platform advertises simple pricing at $0.02 per request with no API keys, no rate limits, and instant access, but the actual functionality behind this particular subscription endpoint is undocumented.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-billing","json-response","post-method"],"categories":["api-gateway","payments"],"synonyms":["lowpaymentfee","x402 API","USDC API access","pay-per-request 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.","The actual functionality behind 'Premium API Access' at /api/v1/stripe/subscriptions/186 is completely undocumented.","No OpenAPI schema or request/response examples are provided.","No robots.txt or agents.txt found on the domain.","The endpoint path includes 'stripe/subscriptions' which is unusual for an x402-settled endpoint — purpose is unclear."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/186","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/186","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 zero documentation on what the endpoint actually does, what inputs it accepts, or what it returns. No OpenAPI schema, no examples, and all doc pages are empty. The listing is effectively a 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'0.02':119,205 '000':108 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':128 '20':107 '300':145 '6':115 'Base network API' 'USDC API access' 'accept':133 'access':6,20,36,97,187,217 'actual':188,220 'address':127 'advertis':201 'ai':63 'amount':104 'analyt':62 'api':5,19,35,58,96,156,186,210 'application/json':138 'base':8,22,87,109,130 'behind':78,222 'beyond':195 'bodi':198 'categori':59 'challeng':81,101,142 'connect':165 'content':171 'crypto-gated API' 'data':61 'decim':116 'descript':182 'doc':155 'document':147 'endpoint':30,47,72,91,132,226 'equat':117 'exampl':179 'expect':194 'extrem':152 'financ':66 'function':221 'gate':3,17,77 'host':54 'includ':60 'infrastructur':69 'input':192 'instant':216 'json-response' 'key':211 'label':94 'learn':65 'limit':214 'lowpaymentfee' 'lowpaymentfee.com':32,51 'machin':64 'mani':46 'maximum':103 'network':88 'offer':48 'one':44 'openapi':175 'page':160 'paid':9,23 'particular':224 'pay-per-request API' 'payment':40,80,123 'per':11,25,120,206 'per-request':10,24 'per-request-billing' 'platform':52,75,150,200 'post':134,197 'post-method' 'premium':4,18,34,95,185 'price':157,203 'prompt':167 'protocol':41 'provid':33 'rate':213 'readm':159 'render':162 'request':12,26,121,135,207 'request/response':178 'requir':105 'respons':139 'return':137,189 'schema':176 'second':146 'sent':125 'settl':82 'simpl':202 'spars':153 'specif':90 'subscript':225 'timeout':143 'undocu':228 'unit':110 'usdc':14,28,84,112 'usdc-base' 'use':114 'util':70 'varieti':56 'via':37 'wallet':166 'web3':67 'x402':2,16,39,79,100,141 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"ef3ffbd1-f4bf-4b86-92aa-e355fdc9cabc","listingId":"4d99b3e8-ee39-4f0c-a28e-4bf69e970ab4","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/186","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:33.690Z"}],"sources":[{"listingId":"4d99b3e8-ee39-4f0c-a28e-4bf69e970ab4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/186","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:33.690Z","lastSeenAt":"2026-04-22T15:02:03.437Z"}],"details":{"listingId":"4d99b3e8-ee39-4f0c-a28e-4bf69e970ab4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/186\n# Returns 402 with x402 challenge; attach X-PAYMENT header with valid USDC 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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/186"},{"claim":"The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/186"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-call USDC micropayments on Base","Agent-driven API consumption without API keys or account setup","Programmatic access to subscription-style endpoints via x402 protocol"],"bestFor":["Developers wanting keyless, pay-per-use API access settled in USDC","AI agents that can handle x402 payment challenges natively","Users who prefer crypto micropayments over traditional subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Anyone without a Base-network USDC wallet","Projects requiring guaranteed SLAs or enterprise support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:49.37Z"},"updatedAt":"2026-04-22T15:02:03.437Z"}}