{"id":"e5076632-f204-4006-8e0e-43d1f0a408f2","shortId":"C79MUp","kind":"x402","title":"Premium API access via x402 micropayment on Base, paid per-request in USDC.","tagline":"Premium API access via x402 micropayment on Base, paid per-request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall. The specific endpoint `/api/v1/stripe/subscriptions/15` accepts POST requests and charges up to 0.02 USDC per call on the Base network (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, which is USDC on Base). Payment is settled on-chain to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using the x402 \"exact\" scheme.\n\nThe broader lowpaymentfee.com platform advertises a suite of 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). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and instant access.\n\nHowever, the specific functionality behind this particular endpoint path (`/api/v1/stripe/subscriptions/15`) is unclear. The path suggests a Stripe subscription resource, but the x402 challenge describes it generically as \"Premium API Access\" with a JSON MIME type response. No OpenAPI schema, request body documentation, or response examples were found in the crawl. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-billing","json-response","post-method"],"categories":["api-gateway","payments"],"synonyms":["x402 API","micropayment API","pay-per-request","USDC API access","Base network API","lowpaymentfee","premium API","crypto-paid API"],"warnings":["No OpenAPI schema or request/response documentation available","All documentation pages (docs, API, pricing, README) returned only 'Connect wallet' with no substantive content","The endpoint path '/api/v1/stripe/subscriptions/15' suggests a Stripe subscription resource but its actual functionality is undocumented","Cannot verify what data or service is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/15","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/15","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","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 does, no request/response schema, and all doc pages returned only 'Connect wallet' with no content. The endpoint path ('stripe/subscriptions/15') is opaque and 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'0.02':52,129 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':75 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':61 'Base network API' 'USDC API access' 'accept':45 'access':3,17,36,141,171 'address':74 'advertis':85 'ai':98 'analysi':102 'analyt':92 'api':2,16,35,89,134,170,194 'asset':60 'base':8,22,58,66 'behind':37,146 'bodi':182 'broader':82 'call':55 'chain':72 'challeng':164 'charg':49 'classif':105 'connect':203 'content':209 'convers':122 'crawl':191 'crypto-paid API' 'data':91,95 'describ':165 'doc':193 'document':183 'embed':106 'endpoint':30,43,125,149 'estim':116 'exact':79 'exampl':186 'exchang':111 'export':96 'feed':110 'financ':107 'found':188 'function':145 'gas':115 'generat':123 'generic':167 'geocod':120 'howev':142 'infrastructur':118 'insight':97 'instant':140 'json':174 'json-response' 'key':135 'learn':100 'limit':138 'list':127 'lowpaymentfee' 'lowpaymentfee.com':32,83 'machin':99 'metric':93 'micropay':6,20 'micropayment API' 'mime':175 'network':59 'on-chain':70 'openapi':179 'page':198 'paid':9,23 'particular':148 'path':150,155 'pay-per-request' 'payment':67 'paywal':40 'per':11,25,54,130 'per-request':10,24 'per-request-billing' 'platform':84 'post':46 'post-method' 'premium':1,15,34,169 'premium API' 'price':109,195 'prompt':205 'provid':33 'quot':114 'rate':112,137 'readm':197 'report':94 'request':12,26,47,131,181 'resourc':160 'respons':177,185 'return':200 'schema':180 'scheme':80 'sentiment':101 'settl':69 'span':90 'specif':42,144 'stripe':158 'subscript':159 'substant':208 'suggest':156 'suit':87 'summar':104 'text':103 'token':113 'type':176 'unclear':153 'usdc':14,28,53,64 'usdc-base' 'use':76 'util':119 'valid':121 'via':4,18 'wallet':204 'web3':108 'x402':5,19,39,78,163 'x402 API' 'x402-payment'","prices":[{"id":"6b5ba5e3-d298-4143-8bcc-b400abc15956","listingId":"e5076632-f204-4006-8e0e-43d1f0a408f2","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/15","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:31.903Z"}],"sources":[{"listingId":"e5076632-f204-4006-8e0e-43d1f0a408f2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/15","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:31.903Z","lastSeenAt":"2026-04-22T15:02:03.359Z"}],"details":{"listingId":"e5076632-f204-4006-8e0e-43d1f0a408f2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/15 \\\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 (0.02 USDC) on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/15"},{"claim":"The platform lists APIs at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is USDC on Base, with extra.name 'USD Coin'","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/15"}],"useCases":["Accessing premium API functionality with per-call USDC micropayments on Base","Agent-driven API consumption without API keys or subscriptions","Programmatic access to a pay-as-you-go endpoint settled on-chain"],"bestFor":["Developers wanting keyless, pay-per-use API access","AI agents with x402-compatible payment capabilities","Users who prefer on-chain USDC settlement over traditional billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before purchasing","Anyone without a Base-compatible USDC wallet","High-volume consumers who need bulk pricing or rate-limit guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:49.401Z"},"updatedAt":"2026-04-22T15:02:03.359Z"}}