{"id":"a11d5897-9468-4b5a-b16f-e2cf90a37323","shortId":"sf6YvF","kind":"x402","title":"Premium API access on lowpaymentfee.com via x402 payment on Base (USDC).","tagline":"Premium API access on lowpaymentfee.com via x402 payment on Base (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 advertises a suite of APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all payable per-request with no API keys, no rate limits, and no commitments.\n\nThe specific endpoint `/api/v1/stripe/subscriptions/37` is labeled \"Premium API Access\" and accepts POST requests. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The maximum amount required per call is 20,000 base units of USDC, which equals $0.02 (USDC uses 6 decimals). The x402 challenge confirms the endpoint is live and returns a standard 402 Payment Required response with version 1 of the x402 protocol.\n\nHowever, the exact functionality behind this \"Premium API Access\" endpoint is unclear. The endpoint path suggests a Stripe subscription resource, but the crawled documentation provides no detail on what data or service is returned after payment. The docs, pricing, API, and README pages all rendered only a \"Connect wallet\" prompt with no further content. Without an OpenAPI schema, example responses, or detailed documentation, the precise capabilities of this endpoint remain uncertain.","tags":[],"capabilities":["x402-payment","usdc-base-network","per-request-billing","no-api-key","post-method"],"categories":["api-access","payments"],"synonyms":["premium API","lowpaymentfee","x402 API","USDC API access","pay-per-request API","Base network API","stripe subscription API"],"warnings":["The exact functionality of this endpoint is unknown — 'Premium API Access' is not described anywhere in the crawled content.","No OpenAPI schema, example requests, or example responses are available.","All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no substantive content.","The endpoint path '/api/v1/stripe/subscriptions/37' suggests a Stripe subscription resource, but no details are provided on what this returns after payment."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/37","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/37","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, but there is no documentation, no OpenAPI schema, no example request/response, and the actual functionality behind \"Premium API Access\" is entirely undocumented. The docs pages all render only a wallet-connect prompt. This is effectively a stub 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'0.02':118 '000':111 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':102 '1':141 '20':110 '402':135 '6':121 'Base network API' 'USDC API access' 'accept':89 'access':3,14,30,87,154 'advertis':48 'ai':56 'amount':105 'analyt':55 'api':2,13,29,52,71,86,153,185 'base':10,21,97,112 'behind':150 'call':108 'capabl':211 'challeng':125 'commit':78 'confirm':126 'connect':193 'content':199 'contract':101 'crawl':168 'data':54,175 'decim':122 'detail':172,207 'doc':183 'document':169,208 'endpoint':24,41,81,128,155,159,214 'equal':117 'exact':148 'exampl':204 'financ':59 'function':149 'howev':146 'infrastructur':62 'key':72 'label':84 'learn':58 'limit':75 'live':130 'lowpaymentfee' 'lowpaymentfee.com':5,16,26,45 'machin':57 'mani':40 'maximum':104 'network':98 'no-api-key' 'offer':42 'one':38 'openapi':202 'page':188 'path':160 'pay-per-request API' 'payabl':65 'payment':8,19,34,92,136,181 'per':67,107 'per-request':66 'per-request-billing' 'platform':46 'post':90 'post-method' 'precis':210 'premium':1,12,28,85,152 'premium API' 'price':184 'prompt':195 'protocol':35,145 'provid':27,170 'rate':74 'readm':187 'remain':215 'render':190 'request':68,91 'requir':106,137 'resourc':165 'respons':138,205 'return':132,179 'schema':203 'servic':177 'settl':94 'span':53 'specif':80 'standard':134 'stripe':163 'stripe subscription API' 'subscript':164 'suggest':161 'suit':50 'uncertain':216 'unclear':157 'unit':113 'usdc':11,22,100,115,119 'usdc-base-network' 'use':99,120 'util':63 'version':140 'via':6,17,31 'wallet':194 'web3':60 'without':200 'x402':7,18,33,124,144 'x402 API' 'x402-payment'","prices":[{"id":"690e32e9-b2b3-4cf8-bd0b-e5ca60b5fbbf","listingId":"a11d5897-9468-4b5a-b16f-e2cf90a37323","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/37","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:55.411Z"}],"sources":[{"listingId":"a11d5897-9468-4b5a-b16f-e2cf90a37323","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/37","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:55.411Z","lastSeenAt":"2026-04-22T10:32:10.042Z"}],"details":{"listingId":"a11d5897-9468-4b5a-b16f-e2cf90a37323","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/37 \\\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 endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/37"},{"claim":"The platform advertises $0.02/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/37"},{"claim":"The platform offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API features on lowpaymentfee.com with per-request USDC payments","Agent-driven programmatic access to paid endpoints without API key management","Demonstrating x402 payment protocol integration for micro-payments"],"bestFor":["Developers experimenting with x402 pay-per-call APIs","Agents that need keyless, pay-as-you-go API access on Base","Users wanting low-cost micro-transaction API calls ($0.02/request)"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Anyone looking for a specific, well-documented API capability (functionality is unclear)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:48.37Z"},"updatedAt":"2026-04-22T10:32:10.042Z"}}