{"id":"137f23a1-7627-4238-b5f2-c9f6da70a04c","shortId":"qgakD7","kind":"x402","title":"x402-gated premium API access on Base, paid per-call in USDC.","tagline":"x402-gated premium API access on Base, paid per-call in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall, settling payments in USDC on the Base network. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0.02 USD per request), consistent with the site's advertised $0.02/request pricing across all its endpoints.\n\nThe parent site lowpaymentfee.com hosts a collection of pay-per-call APIs spanning data & analytics, AI/ML (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints use the same x402 payment model: no API keys, no rate limits, no subscriptions — just a per-request USDC micropayment on Base.\n\nThis specific endpoint (/api/v1/stripe/subscriptions/168) is labeled \"Premium API Access\" but its actual functionality is unclear from the available documentation. The URL path suggests it may relate to Stripe subscription management, but no schema, request/response examples, or detailed docs were found. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. Without further documentation, the exact input parameters and response format remain unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key","http-post"],"categories":["api-gateway","payments"],"synonyms":["lowpaymentfee","x402 api","micropayment api","usdc api access","pay-per-request api","base network api","402 payment required"],"warnings":["No documentation available — docs, API, pricing, and README pages all return only 'Connect wallet' with no content","The endpoint path '/api/v1/stripe/subscriptions/168' suggests Stripe subscription functionality but this is not documented or confirmed","No request body schema or response schema available; actual functionality is unknown","This endpoint is not listed among the advertised APIs on the homepage, making its purpose unclear"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/168","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/168","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 with clear pricing (0.02 USDC on Base). However, there is no documentation, no request/response schema, and no explanation of what this specific endpoint actually does. The docs pages are all empty (just 'Connect wallet'). The listing is essentially a stub with confirmed 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'/request':74 '0.02':63,73 '000':58 '20':57 '402 payment required' 'access':6,20,36,152 'across':76 'actual':155 'advertis':72 'ai/ml':96 'analysi':98 'analyt':95 'api':5,19,35,92,128,151,186 'avail':161 'base':8,22,47,59,143 'base network api' 'base-network' 'behind':37 'call':12,26,91 'challeng':51 'classif':100 'collect':86 'connect':195 'consist':67 'content':201 'convers':117 'cost':55 'data':94 'detail':180 'doc':181,185 'document':162,204 'embed':101 'endpoint':30,79,120,146 'estim':111 'exact':206 'exampl':178 'exchang':106 'feed':105 'financ':102 'format':211 'found':183 'function':156 'gas':110 'gate':3,17 'generat':118 'geocod':115 'host':84 'http-post' 'indic':52 'infrastructur':113 'input':207 'key':129 'label':149 'limit':132 'lowpaymentfee' 'lowpaymentfee.com':32,83 'manag':173 'maximum':54 'may':168 'micropay':141 'micropayment api' 'model':126 'network':48 'no-api-key' 'page':190 'paid':9,23 'paramet':208 'parent':81 'path':165 'pay':89 'pay-per-cal':88 'pay-per-call' 'pay-per-request api' 'payment':42,125 'paywal':40 'per':11,25,65,90,138 'per-cal':10,24 'per-request':137 'premium':4,18,34,150 'price':75,104,187 'prompt':197 'provid':33 'quot':109 'rate':107,131 'readm':189 'relat':169 'remain':212 'request':66,139 'request/response':177 'respons':210 'return':192 'schema':176 'sentiment':97 'settl':41 'site':70,82 'span':93 'specif':145 'stripe':171 'subscript':134,172 'substant':200 'suggest':166 'summar':99 'token':108 'unclear':158 'unit':60 'unknown':213 'url':164 'usd':64 'usdc':14,28,44,62,140 'usdc api access' 'usdc-settlement' 'use':121 'util':114 'valid':116 'wallet':196 'web3':103 'without':202 'x402':2,16,39,50,124 'x402 api' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"bb74d617-13fa-4f3e-bef2-7ffabf8a08fe","listingId":"137f23a1-7627-4238-b5f2-c9f6da70a04c","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/168","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:40.958Z"}],"sources":[{"listingId":"137f23a1-7627-4238-b5f2-c9f6da70a04c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/168","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:40.958Z","lastSeenAt":"2026-04-22T13:31:38.379Z"}],"details":{"listingId":"137f23a1-7627-4238-b5f2-c9f6da70a04c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/168 \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/168"},{"claim":"The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The site hosts APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium API functionality with per-call USDC micropayments","Agent-driven workflows that need keyless, on-demand API access without subscriptions","Integrating pay-as-you-go API calls into Web3 applications on Base"],"bestFor":["Developers who want zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Projects already using USDC on Base that want frictionless API billing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Applications requiring non-crypto payment methods (credit card, invoice, etc.)","High-volume use cases where per-call pricing may be less economical than bulk plans"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:48.954Z"},"updatedAt":"2026-04-22T13:31:38.379Z"}}