{"id":"235e654d-a115-43f0-9d0d-a7401de6d087","shortId":"QAB3HV","kind":"x402","title":"Premium API access subscription endpoint on Base network, paid per-call via x402 in USDC.","tagline":"Premium API access subscription endpoint on Base network, paid per-call via x402 in USDC.","description":"This endpoint at lowpaymentfee.com provides a \"Premium API Access\" subscription resource (ID 62) accessible via the x402 payment protocol. It accepts POST requests and requires an X-PAYMENT header with a crypto payment on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The maximum amount required is 20,000 base units of USDC, which equals $0.02 (USDC uses 6 decimals).\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 market data, and utility services. All endpoints are advertised at $0.02 per request with no API keys, no rate limits, and instant access. The specific subscription endpoint (ID 62) appears to be part of a Stripe subscriptions management layer, though the exact response payload and subscription mechanics are not documented in the available crawl material.\n\nThe endpoint is live and returns a valid x402 challenge (version 1) with a 300-second timeout. No OpenAPI schema, detailed documentation, or example responses were found in the crawl. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical content.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","subscription-management","no-api-key"],"categories":["payments","infrastructure"],"synonyms":["premium access","stripe subscription","x402 subscription","pay-per-call API","USDC payment endpoint","Base network API","lowpaymentfee"],"warnings":["No API documentation available — docs/pricing/README pages only show 'Connect wallet'","No OpenAPI or output schema describing what this endpoint returns","The exact behavior of the subscription endpoint (what it provisions, response format) is undocumented","Cannot confirm what 'Premium API Access' actually grants beyond the endpoint name"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/62","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/62","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 request/response format, and no meaningful documentation beyond a wallet-connect prompt. The purpose of the 'subscriptions/62' resource is unclear from available 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'000':81 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':74 '1':183 '20':80 '300':186 '6':91 '62':45,145 'Base network API' 'USDC payment endpoint' 'accept':53 'access':3,19,41,46,139 'addit':218 'advertis':125 'ai/ml':109 'amount':77 'analysi':112 'analyt':108 'api':2,18,40,105,132,204 'appear':146 'avail':169 'base':7,23,69,82 'call':12,28 'challeng':181 'classif':114 'collect':99 'connect':213 'content':220 'contract':73 'crawl':170,201 'crypto':65 'data':107,118 'decim':92 'detail':192 'doc':203 'document':166,193 'embed':115 'endpoint':5,21,34,123,143,173 'equal':87 'exact':158 'exampl':195 'finance/crypto':116 'found':198 'header':62 'host':97 'id':44,144 'infer':110 'instant':138 'key':133 'layer':155 'limit':136 'live':175 'lowpaymentfee' 'lowpaymentfee.com':36,96 'manag':154 'market':117 'materi':171 'maximum':76 'mechan':163 'network':8,24,70 'no-api-key' 'openapi':190 'page':208 'paid':9,25 'parent':94 'part':149 'pay':102 'pay-per-call API' 'pay-per-request':101 'payload':160 'payment':50,61,66 'per':11,27,103,128 'per-cal':10,26 'post':54 'premium':1,17,39 'premium access' 'price':205 'prompt':215 'protocol':51 'provid':37 'rate':135 'readm':207 'render':210 'request':55,104,129 'requir':57,78 'resourc':43 'respons':159,196 'return':177 'schema':191 'second':187 'sentiment':111 'servic':121 'site':95 'span':106 'specif':141 'stripe':152 'stripe subscription' 'subscript':4,20,42,142,153,162 'subscription-management' 'summar':113 'technic':219 'though':156 'timeout':188 'unit':83 'usdc':16,32,72,85,89 'usdc-base-network' 'use':71,90 'util':120 'valid':179 'version':182 'via':13,29,47 'wallet':214 'x':60 'x-payment':59 'x402':14,30,49,180 'x402 subscription' 'x402-payment'","prices":[{"id":"c512346c-0094-4e4c-823c-eaec352b1ae3","listingId":"235e654d-a115-43f0-9d0d-a7401de6d087","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/62","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:51.199Z"}],"sources":[{"listingId":"235e654d-a115-43f0-9d0d-a7401de6d087","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/62","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:51.199Z","lastSeenAt":"2026-04-22T10:02:16.827Z"}],"details":{"listingId":"235e654d-a115-43f0-9d0d-a7401de6d087","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/62 \\\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 base units USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/62"},{"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/62"}],"useCases":["Programmatic subscription activation or management via crypto payment","Agent-driven access to premium API tiers without traditional API keys","Automated pay-per-use access to bundled API services"],"bestFor":["Agents needing keyless, pay-per-call API access on Base","Developers wanting to avoid traditional subscription billing","Crypto-native applications requiring on-chain payment verification"],"notFor":["Users who need detailed API documentation before integrating","Applications requiring fiat-only payment methods","High-volume use cases where per-request pricing may be costly at scale"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:48.491Z"},"updatedAt":"2026-04-22T10:02:16.827Z"}}