{"id":"42473ce1-4966-465d-8a99-65b4c8bff7c0","shortId":"x5aGeC","kind":"x402","title":"x402-gated premium API access on Base, paid per-request in USDC.","tagline":"x402-gated premium API access on Base, paid per-request 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 provider hosts a broad catalog of pay-per-call APIs spanning data & analytics (metrics, reports, data export, insights), AI & machine learning (sentiment analysis, text summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). This specific endpoint (/api/v1/stripe/subscriptions/154) is labeled \"Premium API Access\" but its exact functionality is not documented beyond that title — it may relate to subscription management or a bundled premium tier.\n\nThe endpoint accepts POST requests and returns application/json. No API keys or rate limits are advertised; access is gated purely by the x402 payment protocol. The site's docs, pricing, and API pages all appear to require a wallet connection and contain no additional documentation content. Because the actual behavior behind this specific endpoint path is undocumented, callers should treat it as experimental until more details emerge.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-request-billing","json-api","no-api-key","post-method"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC API access","Base network API","micropayment API","lowpaymentfee","premium API subscription"],"warnings":["No documentation available for this specific endpoint — its actual functionality is unknown","All secondary pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no content","The endpoint path '/api/v1/stripe/subscriptions/154' suggests Stripe subscription management but this is unverified","No OpenAPI spec or request/response schema provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/154","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/154","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation of what this specific endpoint actually does, no OpenAPI schema, no example request/response, and the docs/pricing/API pages are all empty beyond a wallet-connect prompt. The endpoint path suggests subscription management but this is 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'/request':74 '0.02':63,73 '000':58 '20':57 'Base network API' 'USDC API access' 'accept':158 'access':6,20,36,134,172 'across':76 'actual':204 'addit':199 'advertis':72,171 'ai':100 'analysi':104 'analyt':94 'api':5,19,35,91,133,165,187 'appear':190 'application/json':163 'base':8,22,47,59 'base-network' 'behavior':205 'behind':37,206 'beyond':142 'broad':84 'bundl':153 'call':90 'caller':213 'catalog':85 'challeng':51 'classif':107 'connect':195 'consist':67 'contain':197 'content':201 'convers':124 'cost':55 'data':93,97 'detail':221 'doc':184 'document':141,200 'embed':108 'emerg':222 'endpoint':30,79,128,157,209 'estim':118 'exact':137 'exchang':113 'experiment':218 'export':98 'feed':112 'financ':109 'function':138 'gas':117 'gate':3,17,174 'generat':125 'geocod':122 'host':82 'indic':52 'infrastructur':120 'insight':99 'json-api' 'key':166 'label':131 'learn':102 'limit':169 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':101 'manag':150 'maximum':54 'may':146 'metric':95 'micropayment API' 'network':48 'no-api-key' 'page':188 'paid':9,23 'path':210 'pay':88 'pay-per-cal':87 'pay-per-call API' 'payment':42,179 'paywal':40 'per':11,25,65,89 'per-request':10,24 'per-request-billing' 'post':159 'post-method' 'premium':4,18,34,132,154 'premium API subscription' 'price':75,111,185 'protocol':180 'provid':33,81 'pure':175 'quot':116 'rate':114,168 'relat':147 'report':96 'request':12,26,66,160 'requir':192 'return':162 'sentiment':103 'settl':41 'site':70,182 'span':92 'specif':127,208 'subscript':149 'summar':106 'text':105 'tier':155 'titl':144 'token':115 'treat':215 'undocu':212 'unit':60 'usd':64 'usdc':14,28,44,62 'usdc-settlement' 'util':121 'valid':123 'wallet':194 'web3':110 'x402':2,16,39,50,178 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"b4c79245-5f9a-4792-98e1-53d0b4066c43","listingId":"42473ce1-4966-465d-8a99-65b4c8bff7c0","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/154","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:29.491Z"}],"sources":[{"listingId":"42473ce1-4966-465d-8a99-65b4c8bff7c0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/154","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:29.491Z","lastSeenAt":"2026-04-22T16:31:56.127Z"}],"details":{"listingId":"42473ce1-4966-465d-8a99-65b4c8bff7c0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/154 \\\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 site advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge shows maxAmountRequired of 20000 base units of USDC (USD Coin, 6 decimals = $0.02) on the Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/154"},{"claim":"The provider offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium API services without traditional API key management","Agent-driven pay-per-call workflows settled in USDC on Base","Accessing bundled API services (analytics, AI, finance, utilities) through a single payment gateway"],"bestFor":["Developers wanting keyless, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","Applications requiring free-tier or trial access","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:49.513Z"},"updatedAt":"2026-04-22T16:31:56.127Z"}}