{"id":"6d28dfa3-8629-4088-99eb-d48fd0017276","shortId":"at4vS8","kind":"x402","title":"Premium API subscription access via x402 payment on Base network using USDC.","tagline":"Premium API subscription access via x402 payment on Base network using USDC.","description":"This endpoint at lowpaymentfee.com provides a \"Premium API Access\" subscription tier, accessible via the x402 payment protocol on the Base network. The endpoint is located at `/api/v1/stripe/subscriptions/150` and accepts POST requests with payment settled in USDC (USD Coin) on Base. The maximum amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per request.\n\nThe broader lowpaymentfee.com platform offers a suite of pay-per-request APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are advertised at $0.02 per request with no API keys, no rate limits, and instant access via x402 payment headers.\n\nThe specific subscription endpoint's behavior beyond payment acceptance is unclear — the crawled documentation pages only show a \"Connect wallet\" prompt with no further detail on what the subscription grants or how it differs from per-request access. No OpenAPI schema, request/response examples, or detailed documentation were found.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","subscription-management","pay-per-request","no-api-key"],"categories":["payments","infrastructure"],"synonyms":["x402 subscription","USDC API payment","Base network API","pay-per-call API","crypto API access","lowpaymentfee"],"warnings":["No documentation available — all doc pages only show 'Connect wallet' with no content","No request or response schema provided for this subscription endpoint","Unclear what 'Premium API Access' subscription grants vs. per-request endpoints","No OpenAPI spec or AI plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/150","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/150","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (returns 402 challenge) and pricing is clear ($0.02 USDC on Base), but there is no documentation on what the subscription endpoint actually returns, no request/response schema, and the docs pages are empty beyond a wallet connect prompt. Effectively a stub 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'0.02':80,128 '000':71 '20':70 '6':76 'Base network API' 'USDC API payment' 'accept':53,153 'access':4,16,33,36,140,183 'advertis':126 'ai/ml':99 'amount':67 'analysi':102 'analyt':98 'api':2,14,32,95,133 'base':9,21,44,64,72 'base-network' 'behavior':150 'beyond':151 'broader':84 'classif':104 'coin':62 'connect':163 'convers':121 'crawl':157 'crypto API access' 'data':97 'decim':77 'detail':169,190 'differ':178 'document':158,191 'embed':105 'endpoint':26,47,124,148 'equal':79 'estim':115 'exampl':188 'exchang':110 'feed':109 'financ':106 'found':193 'gas':114 'generat':122 'geocod':119 'grant':174 'header':144 'infer':100 'infrastructur':117 'instant':139 'key':134 'limit':137 'locat':49 'lowpaymentfee' 'lowpaymentfee.com':28,85 'maximum':66 'network':10,22,45 'no-api-key' 'offer':87 'openapi':185 'page':159 'pay':92 'pay-per-call API' 'pay-per-request':91 'payment':7,19,40,57,143,152 'per':81,93,129,181 'per-request':180 'platform':86 'post':54 'premium':1,13,31 'price':108 'prompt':165 'protocol':41 'provid':29 'quot':113 'rate':111,136 'request':55,82,94,130,182 'request/response':187 'requir':68 'schema':186 'sentiment':101 'settl':58 'show':161 'span':96 'specif':146 'subscript':3,15,34,147,173 'subscription-management' 'suit':89 'summar':103 'tier':35 'token':112 'unclear':155 'unit':73 'usd':61 'usdc':12,24,60,75 'usdc-settlement' 'use':11,23 'util':118 'valid':120 'via':5,17,37,141 'wallet':164 'web3':107 'x402':6,18,39,142 'x402 subscription' 'x402-payment'","prices":[{"id":"8994291a-3071-436b-8909-529f2c282d2d","listingId":"6d28dfa3-8629-4088-99eb-d48fd0017276","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/150","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:32.472Z"}],"sources":[{"listingId":"6d28dfa3-8629-4088-99eb-d48fd0017276","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/150","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:32.472Z","lastSeenAt":"2026-04-22T15:02:03.364Z"}],"details":{"listingId":"6d28dfa3-8629-4088-99eb-d48fd0017276","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/150 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/150"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/150"}],"useCases":["Purchasing premium subscription access to lowpaymentfee.com APIs via on-chain USDC payment","Programmatic subscription management for AI agents that need recurring API access","Enabling wallet-based authentication and payment for API services without traditional API keys"],"bestFor":["Agents or services that already hold USDC on Base and want frictionless API access","Developers seeking pay-as-you-go API access without signup or key management","Crypto-native applications needing low-cost per-request API calls"],"notFor":["Users who need detailed documentation or guaranteed SLAs before purchasing","Applications requiring fiat-only payment rails with no crypto involvement","High-volume consumers who need bulk pricing or enterprise contracts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:49.375Z"},"updatedAt":"2026-04-22T15:02:03.364Z"}}