{"id":"1228a75b-6052-4bac-9e7b-6906d874e60d","shortId":"PhtQRR","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. The specific endpoint path (`/api/v1/stripe/subscriptions/28`) suggests a subscription-related resource, though the x402 challenge indicates it operates on a per-request payment model using USDC on the Base network.\n\nThe provider's landing page advertises a broad suite of APIs spanning data & analytics, AI & machine learning (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). Most listed endpoints are priced at $0.02 per request. However, this particular endpoint's x402 challenge specifies a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 — consistent with the site-wide pricing.\n\nThe endpoint accepts POST requests, settles payments in USDC on Base (contract 0x8335…2913), and uses the x402 \"exact\" payment scheme. No API keys or rate limits are advertised. Documentation pages beyond the landing page returned only a \"Connect wallet\" prompt with no substantive content, so the actual request/response schema for this specific endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-request-billing","post-endpoint","subscription-api"],"categories":["api-gateway","payments"],"synonyms":["lowpaymentfee","x402 api","pay-per-call api","USDC api access","base network api","micropayment api","premium api subscription"],"warnings":["No OpenAPI schema or request/response documentation available","All documentation pages (docs, api, pricing, README) returned only a 'Connect wallet' prompt with no useful content","The endpoint path suggests a subscription resource but the actual payload and response format are unknown","The relationship between 'stripe/subscriptions' in the path and x402 crypto payment is unclear and potentially confusing"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/28","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/28","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and the purpose of this specific endpoint (subscriptions/28) is unclear. All doc pages returned only 'Connect wallet' with no 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'0.02':117,141 '000':132 '0x8335':161 '20':131 '2913':162 '6':137 'USDC api access' 'accept':151 'access':6,20,36 'actual':196 'advertis':77,177 'ai':86 'analysi':90 'analyt':85 'api':5,19,35,82,171 'base':8,22,70,133,159 'base network api' 'base-network' 'behind':37 'beyond':180 'broad':79 'call':12,26 'challeng':55,126 'classif':92 'connect':187 'consist':142 'content':193 'contract':160 'convers':109 'data':84 'decim':138 'document':178 'embed':93 'endpoint':30,43,113,123,150,202 'equal':140 'estim':103 'exact':167 'exchang':98 'feed':97 'financ':94 'gas':102 'gate':3,17 'generat':110 'geocod':107 'howev':120 'indic':56 'infrastructur':105 'key':172 'land':75,182 'learn':88 'limit':175 'list':112 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':87 'maxamountrequir':129 'micropayment api' 'model':65 'network':71 'oper':58 'page':76,179,183 'paid':9,23 'particular':122 'path':44 'pay-per-call api' 'payment':64,155,168 'paywal':40 'per':11,25,62,118 'per-cal':10,24 'per-request':61 'per-request-billing' 'post':152 'post-endpoint' 'premium':4,18,34 'premium api subscription' 'price':96,115,148 'prompt':189 'provid':33,73 'quot':101 'rate':99,174 'relat':50 'request':63,119,153 'request/response':197 'resourc':51 'return':184 'schema':198 'scheme':169 'sentiment':89 'settl':154 'site':146 'site-wid':145 'span':83 'specif':42,201 'specifi':127 'subscript':49 'subscription-api' 'subscription-rel':48 'substant':192 'suggest':46 'suit':80 'summar':91 'though':52 'token':100 'unit':134 'unknown':204 'usdc':14,28,67,136,157 'usdc-settlement' 'use':66,164 'util':106 'valid':108 'wallet':188 'web3':95 'wide':147 'x402':2,16,39,54,125,166 'x402 api' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"cb7af5d6-f6e2-4b7b-a078-de32139be4ad","listingId":"1228a75b-6052-4bac-9e7b-6906d874e60d","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/28","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:44.603Z"}],"sources":[{"listingId":"1228a75b-6052-4bac-9e7b-6906d874e60d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/28","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:44.603Z","lastSeenAt":"2026-04-22T13:31:38.538Z"}],"details":{"listingId":"1228a75b-6052-4bac-9e7b-6906d874e60d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/28 \\\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","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/28"},{"claim":"The site advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/28"}],"useCases":["Accessing a premium subscription resource via a single USDC micropayment on Base","Agent-driven API consumption without API keys or account registration","Programmatic pay-per-use access to subscription data"],"bestFor":["Developers wanting keyless, pay-per-call API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over traditional billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","Anyone without a Base-compatible USDC wallet","High-volume consumers who need bulk/subscription pricing discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:48.832Z"},"updatedAt":"2026-04-22T13:31:38.538Z"}}