{"id":"17d7e300-b152-4720-ba30-391447839a22","shortId":"dSqMsG","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 specific resource path (`/api/v1/stripe/subscriptions/143`) suggests a subscription-related API, though the x402 challenge indicates it operates on a per-request payment model rather than a traditional subscription. The endpoint accepts POST requests and returns application/json responses.\n\nThe broader lowpaymentfee.com platform offers a suite 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). Most endpoints on the platform are listed at $0.02 per request. However, this particular endpoint has a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 — consistent with the platform's standard pricing.\n\nThe platform advertises no API keys, no rate limits, and instant access via the x402 protocol. Payment is made by including an X-PAYMENT header with each request. Documentation pages on the site appear to require a wallet connection and did not yield substantive content during crawling, so the exact request/response schema for this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-request-billing","json-api","post-method","premium-access"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC API access","Base network API","crypto-paid API","lowpaymentfee","subscription API"],"warnings":["No OpenAPI or request/response schema available — the exact functionality of this endpoint is unknown.","Documentation pages (docs, pricing, README) returned no substantive content; they appear to require wallet connection.","The endpoint path references 'stripe/subscriptions' which is ambiguous — it may be a subscription management endpoint or simply a naming artifact.","The actual behavior and output of this endpoint cannot be verified without making a paid request."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/143","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/143","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 OpenAPI schema, no documented request/response format, and the docs/pricing/README pages all returned only a 'Connect wallet' prompt with no usable content. The endpoint path ('stripe/subscriptions/143') is opaque — it's unclear what the endpoint actually does beyond 'Premium API 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'0.02':135,156 '000':147 '20':146 '6':152 'Base network API' 'USDC API access' 'accept':81 'access':6,20,36,175 'advertis':166 'ai/ml':104 'analysi':106 'analyt':103 'api':5,19,35,59,100,168 'appear':198 'application/json':86 'base':8,22,47,148 'base-network' 'behind':37 'broader':89 'call':99 'challeng':63 'classif':108 'connect':203 'consist':157 'content':209 'convers':125 'crawl':211 'crypto-paid API' 'data':102 'decim':153 'document':193 'embed':109 'endpoint':30,80,128,141,219 'equal':155 'estim':119 'exact':214 'exchang':114 'feed':113 'financ':110 'gas':118 'gate':3,17 'generat':126 'geocod':123 'header':189 'howev':138 'includ':184 'indic':64 'infrastructur':121 'instant':174 'json-api' 'key':169 'limit':172 'list':133 'lowpaymentfee' 'lowpaymentfee.com':32,90 'made':182 'maxamountrequir':144 'model':73 'network':48 'offer':92 'oper':66 'page':194 'paid':9,23 'particular':140 'path':52 'pay':97 'pay-per-cal':96 'pay-per-call API' 'payment':42,72,180,188 'paywal':40 'per':11,25,70,98,136 'per-request':10,24,69 'per-request-billing' 'platform':91,131,160,165 'post':82 'post-method' 'premium':4,18,34 'premium-access' 'price':112,163 'protocol':179 'provid':33 'quot':117 'rate':115,171 'rather':74 'relat':58 'request':12,26,71,83,137,192 'request/response':215 'requir':200 'resourc':51 'respons':87 'return':85 'schema':216 'sentiment':105 'settl':41 'site':197 'span':101 'specif':50 'standard':162 'subscript':57,78 'subscription API' 'subscription-rel':56 'substant':208 'suggest':54 'suit':94 'summar':107 'though':60 'token':116 'tradit':77 'unit':149 'unknown':221 'usdc':14,28,44,151 'usdc-settlement' 'util':122 'valid':124 'via':176 'wallet':202 'web3':111 'x':187 'x-payment':186 'x402':2,16,39,62,178 'x402 API' 'x402-gated':1,15 'x402-payment' 'yield':207","prices":[{"id":"b5c22f28-18b9-4062-b414-5ebf98200ca5","listingId":"17d7e300-b152-4720-ba30-391447839a22","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/143","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:24.072Z"}],"sources":[{"listingId":"17d7e300-b152-4720-ba30-391447839a22","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/143","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:24.072Z","lastSeenAt":"2026-04-22T18:32:18.160Z"}],"details":{"listingId":"17d7e300-b152-4720-ba30-391447839a22","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/143 \\\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 network","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/143"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/143"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium API features with per-request USDC micropayments","Agent-driven workflows that need keyless, instant API access without signup","Integrating pay-as-you-go API calls into Web3 applications on Base"],"bestFor":["Developers who want keyless, pay-per-request API access","AI agents that can settle x402 payments autonomously","Users already holding USDC on the Base network"],"notFor":["Users who need detailed API documentation before integrating (docs are sparse)","Applications requiring free or fiat-only payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:49.86Z"},"updatedAt":"2026-04-22T18:32:18.160Z"}}