{"id":"3928692a-104c-466f-9441-6bf7a84a0eef","shortId":"twdYMH","kind":"x402","title":"Premium API access subscription endpoint on Base via x402, paid in USDC.","tagline":"Premium API access subscription endpoint on Base via x402, paid in USDC.","description":"This endpoint at lowpaymentfee.com provides a \"Premium API Access\" subscription resource via the x402 payment protocol. It accepts POST requests and requires an X-PAYMENT header with a crypto payment settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The maximum amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per request.\n\nThe parent site lowpaymentfee.com hosts a collection of pay-per-request APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are advertised at $0.02 per call with no API keys, no rate limits, and instant access.\n\nThis specific endpoint (/api/v1/stripe/subscriptions/45) appears to be a subscription-related resource, though the exact response payload and input parameters are not documented. The endpoint is live and returns a valid x402 challenge. Documentation pages on the site are sparse, showing only a \"Connect wallet\" prompt without further technical detail.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","subscription-management","no-api-key-required"],"categories":["payments","infrastructure"],"synonyms":["premium access","subscription API","x402 subscription","USDC payment endpoint","Base network API","pay-per-call","lowpaymentfee"],"warnings":["No API documentation available beyond endpoint listing","Response schema and input parameters are undocumented","Docs, pricing, and README pages all render only 'Connect wallet' with no useful content","Exact behavior of the subscription endpoint is unclear — it may provision access or return subscription status"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/45","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/45","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no OpenAPI schema, no documented input/output format, and the docs pages are empty stubs showing only 'Connect wallet'. The purpose of this specific subscription endpoint is unclear beyond its 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'0.02':80,127 '000':71 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':64 '20':70 '6':76 'Base network API' 'USDC payment endpoint' 'accept':42 'access':3,15,33,139 'advertis':125 'ai/ml':99 'amount':67 'analysi':102 'analyt':98 'api':2,14,32,95,132 'appear':144 'base':7,19,59,72 'call':129 'challeng':172 'classif':104 'collect':89 'connect':183 'contract':63 'convers':120 'crypto':54 'data':97 'decim':77 'detail':189 'document':162,173 'embed':105 'endpoint':5,17,26,123,142,164 'equal':79 'estim':114 'exact':154 'exchang':109 'feed':108 'finance/web3':106 'gas':113 'generat':121 'geocod':118 'header':51 'host':87 'infer':100 'infrastructur':116 'input':158 'instant':138 'key':133 'limit':136 'live':166 'lowpaymentfee' 'lowpaymentfee.com':28,86 'maximum':66 'network':60 'no-api-key-required' 'page':174 'paid':10,22 'paramet':159 'parent':84 'pay':92 'pay-per-call' 'pay-per-request':91 'payload':156 'payment':39,50,55 'per':81,93,128 'post':43 'premium':1,13,31 'premium access' 'price':107 'prompt':185 'protocol':40 'provid':29 'quot':112 'rate':110,135 'relat':150 'request':44,82,94 'requir':46,68 'resourc':35,151 'respons':155 'return':168 'sentiment':101 'settl':56 'show':180 'site':85,177 'span':96 'spars':179 'specif':141 'subscript':4,16,34,149 'subscription API' 'subscription-management' 'subscription-rel':148 'summar':103 'technic':188 'though':152 'token':111 'unit':73 'usdc':12,24,62,75 'usdc-base-network' 'use':61 'util':117 'valid':119,170 'via':8,20,36 'wallet':184 'without':186 'x':49 'x-payment':48 'x402':9,21,38,171 'x402 subscription' 'x402-payment'","prices":[{"id":"d3e0c9c9-18bb-4eb7-baf7-5b84f812f807","listingId":"3928692a-104c-466f-9441-6bf7a84a0eef","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/45","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:50.606Z"}],"sources":[{"listingId":"3928692a-104c-466f-9441-6bf7a84a0eef","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/45","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:50.606Z","lastSeenAt":"2026-04-22T10:02:16.801Z"}],"details":{"listingId":"3928692a-104c-466f-9441-6bf7a84a0eef","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/45 \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a valid x402 challenge with maxAmountRequired of 20000 USDC base units on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/45"},{"claim":"Site advertises $0.02 per request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/45"}],"useCases":["Programmatic subscription activation via crypto payment","Agent-driven premium API access without traditional API keys","Automated pay-per-use access to premium services on Base"],"bestFor":["AI agents needing keyless premium API access","Developers wanting crypto-native subscription management","Applications requiring low-friction pay-per-request endpoints"],"notFor":["Users needing detailed API documentation before purchasing","Applications requiring fiat-only payment rails","High-volume use cases where subscription flat-rate would be cheaper"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:48.564Z"},"updatedAt":"2026-04-22T10:02:16.801Z"}}