{"id":"547d09cf-4364-420e-8f8e-78a6892d5dbc","shortId":"MQrSwm","kind":"x402","title":"Premium API access subscription via x402 payment on Base network using USDC.","tagline":"Premium API access subscription via x402 payment on Base network using USDC.","description":"This endpoint at lowpaymentfee.com provides a \"Premium API Access\" subscription resource, accessible via x402 payment protocol on the Base network. The payment is settled in USDC (USD Coin) at the contract address 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/crypto data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per call with no API keys, no rate limits, and no commitments required.\n\nThis specific endpoint (/api/v1/stripe/subscriptions/102) appears to be a subscription-related resource, possibly granting access to a premium tier or bundle. The endpoint accepts POST requests and returns application/json. The x402 challenge was successfully captured, confirming the endpoint is live and operational with a 300-second payment timeout window.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","subscription-management","no-api-key","json-response"],"categories":["payments","subscription"],"synonyms":["premium subscription API","x402 subscription","USDC API payment","Base network API","pay-per-use API","lowpaymentfee","crypto API access"],"warnings":["No request/response schema documented — actual payload structure is unknown","Documentation pages (/docs, /pricing, /README) returned no useful content beyond 'Connect wallet'","The endpoint path suggests Stripe integration but payment is x402/USDC — purpose of 'stripe/subscriptions' path segment is unclear","No examples of successful responses available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/102","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/102","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.450","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint works. However, there is no OpenAPI schema, no documentation of request/response bodies, and the crawled docs/pricing/README pages only show 'Connect wallet' with no substantive content. The exact behavior of this subscription endpoint is 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'0.02':73,121 '000':64 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':57 '20':63 '300':179 '6':69 'Base network API' 'USDC API payment' 'accept':158 'access':3,15,33,36,149 'address':56 'ai/ml':92 'amount':60 'analysi':95 'analyt':91 'api':2,14,32,88,126 'appear':139 'application/json':163 'base':9,21,43,65 'base-network' 'bundl':155 'call':123 'captur':169 'challeng':166 'classif':97 'coin':52 'collect':82 'commit':133 'confirm':170 'contract':55 'convers':114 'crypto API access' 'data':90,100 'decim':70 'embed':98 'endpoint':26,117,137,157,172 'equal':72 'estim':108 'exchang':103 'feed':102 'finance/crypto':99 'gas':107 'generat':115 'geocod':112 'grant':148 'host':80 'infer':93 'infrastructur':110 'json-response' 'key':127 'limit':130 'live':174 'lowpaymentfee' 'lowpaymentfee.com':28,79 'maximum':59 'network':10,22,44 'no-api-key' 'oper':176 'parent':77 'pay':85 'pay-per-request':84 'pay-per-use API' 'payment':7,19,39,46,181 'per':74,86,122 'possibl':147 'post':159 'premium':1,13,31,152 'premium subscription API' 'price':101,119 'protocol':40 'provid':29 'quot':106 'rate':104,129 'relat':145 'request':75,87,160 'requir':61,134 'resourc':35,146 'return':162 'second':180 'sentiment':94 'settl':48 'site':78 'span':89 'specif':136 'subscript':4,16,34,144 'subscription-management' 'subscription-rel':143 'success':168 'summar':96 'tier':153 'timeout':182 'token':105 'unit':66 'usd':51 'usdc':12,24,50,68 'usdc-settlement' 'use':11,23 'util':111 'valid':113 'via':5,17,37 'window':183 'x402':6,18,38,165 'x402 subscription' 'x402-payment'","prices":[{"id":"f99a5155-c4ce-4351-9cd1-2c910671b984","listingId":"547d09cf-4364-420e-8f8e-78a6892d5dbc","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/102","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:19.220Z"}],"sources":[{"listingId":"547d09cf-4364-420e-8f8e-78a6892d5dbc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/102","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:19.220Z","lastSeenAt":"2026-04-22T18:32:17.914Z"}],"details":{"listingId":"547d09cf-4364-420e-8f8e-78a6892d5dbc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/102 \\\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 402 with x402 challenge requiring 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/102"},{"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/102"}],"useCases":["Purchasing premium API access without traditional API key registration","Programmatic subscription management via crypto payments","Agent-driven access to premium-tier services on lowpaymentfee.com"],"bestFor":["Developers wanting keyless, pay-per-use API access","AI agents that can settle payments in USDC on Base","Users who prefer crypto-native subscription models without accounts"],"notFor":["Users who need free-tier or trial access before paying","Those who cannot transact on the Base L2 network","Applications requiring fiat-only payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:50.066Z"},"updatedAt":"2026-04-22T18:32:17.914Z"}}