{"id":"6b59927f-3620-450b-874e-89260016439e","shortId":"dpeD3U","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\" behind an x402 payment wall. It is one of many endpoints offered by the lowpaymentfee.com platform, which advertises a suite of APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all payable per-request via the x402 protocol on the Base network using USDC.\n\nThe specific endpoint `/api/v1/stripe/subscriptions/171` returns a valid x402 challenge (version 1, scheme \"exact\") requesting up to 20,000 base units of USDC (0x8335…) on Base. Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the platform's advertised flat pricing of $0.02/request across all endpoints. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts HTTP POST and is marked as discoverable.\n\nHowever, the actual functionality behind this specific endpoint is unclear. The URL path suggests a Stripe subscription resource (ID 171), but the platform's landing page does not list or describe this particular route. No OpenAPI schema, request/response examples, or detailed documentation were found — the docs, API, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no substantive content. Without knowing what data or service this endpoint returns upon successful payment, agents should treat this as a low-documentation listing.","tags":[],"capabilities":["x402-payment","usdc-on-base","per-request-billing","http-post","discoverable-endpoint"],"categories":["api","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","lowpaymentfee","Base network API","crypto-paid API","402 payment required"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","The endpoint path '/api/v1/stripe/subscriptions/171' is not listed among the platform's advertised APIs; its actual functionality is unknown.","No request body schema or response schema provided; callers cannot know what to send or what to expect back.","No OpenAPI spec or ai-plugin manifest found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/171","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/171","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 ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality of this specific endpoint (stripe/subscriptions/171) is unexplained. The docs and other pages are empty beyond a wallet-connect 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'/request':131 '0.02':118,130 '000':102 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':140 '0x8335':107 '1':95 '171':175 '20':101 '300':143 '402 payment required' '6':113 'Base network API' 'USDC micropayment endpoint' 'accept':148 'access':6,20,36 'across':132 'actual':158 'address':139 'advertis':54,126 'agent':230 'ai':62 'analyt':61 'api':5,19,35,58,202 'base':8,22,81,103,109 'behind':37,160 'challeng':93 'connect':211 'consist':121 'content':217 'crypto-paid API' 'data':60,221 'decim':114 'describ':186 'detail':196 'discover':155 'discoverable-endpoint' 'doc':201 'document':197,238 'endpoint':30,47,87,134,147,163,225 'exact':97 'exampl':194 'financ':65 'flat':127 'found':199 'function':159 'gate':3,17 'howev':156 'http':149 'http-post' 'id':174 'infrastructur':68 'know':219 'land':180 'learn':64 'list':184,239 'low':237 'low-document':236 'lowpaymentfee' 'lowpaymentfee.com':32,51 'machin':63 'mani':46 'mark':153 'network':82 'offer':48 'one':44 'openapi':191 'page':181,206 'paid':9,23 'particular':188 'path':168 'pay-per-call API' 'payabl':71 'payment':40,135,229 'per':11,25,73,119 'per-request':10,24,72 'per-request-billing' 'platform':52,124,178 'post':150 'premium':4,18,34 'price':128,203 'prompt':213 'protocol':78 'provid':33 'readm':205 'render':208 'request':12,26,74,98,120 'request/response':193 'resourc':173 'return':89,226 'rout':189 'schema':192 'scheme':96 'second':144 'sent':137 'servic':223 'sinc':110 'span':59 'specif':86,162 'stripe':171 'subscript':172 'substant':216 'success':228 'suggest':169 'suit':56 'timeout':145 'translat':116 'treat':232 'unclear':165 'unit':104 'upon':227 'url':167 'usdc':14,28,84,106,111 'usdc-on-base' 'use':83,112 'util':69 'valid':91 'version':94 'via':75 'wall':41 'wallet':212 'web3':66 'without':218 'x402':2,16,39,77,92 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"f9d75067-98e4-4808-9518-590b36b07a18","listingId":"6b59927f-3620-450b-874e-89260016439e","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/171","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:33.072Z"}],"sources":[{"listingId":"6b59927f-3620-450b-874e-89260016439e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/171","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:33.072Z","lastSeenAt":"2026-04-22T05:31:33.338Z"}],"details":{"listingId":"6b59927f-3620-450b-874e-89260016439e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/171 \\\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 platform advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, which equals $0.02.","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/171"},{"claim":"The platform lists APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories.","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API resource via x402 micropayment","Agent-driven per-request purchasing without API keys or subscriptions","Demonstrating x402 payment flow on Base with USDC"],"bestFor":["Developers experimenting with x402 payment protocol on Base","Agents that can handle x402 challenges and USDC payments","Use cases requiring keyless, pay-as-you-go API access"],"notFor":["Users who need detailed documentation or guaranteed SLAs before paying","Applications requiring known, well-documented response schemas","High-volume use cases where $0.02/request adds up without clear value"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:49.376Z"},"updatedAt":"2026-04-22T05:31:33.338Z"}}