{"id":"13a0c1b3-fb52-4a17-92f3-abf81f65de6c","shortId":"rL7sWA","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, settling payments in USDC on the Base network. The specific resource path (`/api/v1/stripe/subscriptions/88`) suggests a subscription-related endpoint, though the x402 challenge uses the \"exact\" (one-shot) payment scheme rather than a recurring subscription model. The price per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD.\n\nThe broader lowpaymentfee.com platform advertises a 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). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and instant access via x402 on Base. However, the crawled documentation pages (docs, pricing, README) returned only \"Connect wallet\" with no substantive content, so the actual functionality behind this specific endpoint is unclear.\n\nThe endpoint is confirmed live — it returns a proper x402 challenge with version 1, accepting POST requests. Payment is directed to wallet `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC at contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base, with a 300-second payment timeout.","tags":[],"capabilities":["x402-payment","usdc-base","per-call-billing","http-post","json-response"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC API access","Base network API","micropayment API","lowpaymentfee"],"warnings":["No API documentation available — docs, pricing, and README pages all return only 'Connect wallet' with no content.","The actual functionality of this specific endpoint (/api/v1/stripe/subscriptions/88) is unclear; the path suggests subscription management but no schema or description is provided.","No input or output schema beyond the basic outputSchema stub in the x402 challenge.","The platform lists many endpoint categories (AI, finance, analytics, etc.) but none have documented schemas or examples."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/88","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/88","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, but there is no OpenAPI schema, no documentation beyond a landing page listing, no example request/response bodies, and the actual functionality behind this specific path is undocumented. The docs, pricing, and README pages are all empty 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'0.02':93,137 '000':84 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':202 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':207 '1':193 '20':83 '300':212 '6':89 'Base network API' 'USDC API access' 'accept':194 'access':6,20,36,149 'actual':172 'advertis':99 'ai':107 'analysi':111 'analyt':106 'api':5,19,35,103,142 'base':8,22,47,85,153,209 'behind':37,174 'broader':96 'call':12,26,81 'challeng':63,190 'classif':113 'confirm':183 'connect':164 'content':169 'contract':206 'convers':130 'crawl':156 'data':105 'decim':90 'direct':199 'doc':159 'document':157 'embed':114 'endpoint':30,59,133,177,181 'equal':92 'estim':124 'exact':66 'exchang':119 'feed':118 'financ':115 'function':173 'gas':123 'gate':3,17 'generat':131 'geocod':128 'howev':154 'http-post' 'infrastructur':126 'instant':148 'json-response' 'key':143 'learn':109 'limit':146 'list':135 'live':184 'lowpaymentfee' 'lowpaymentfee.com':32,97 'machin':108 'micropayment API' 'model':77 'network':48 'one':68 'one-shot':67 'page':158 'paid':9,23 'path':52 'pay-per-call API' 'payment':42,70,197,214 'paywal':40 'per':11,25,80,138 'per-cal':10,24 'per-call-billing' 'platform':98 'post':195 'premium':4,18,34 'price':79,117,160 'proper':188 'provid':33 'quot':122 'rate':120,145 'rather':72 'readm':161 'recur':75 'relat':58 'request':139,196 'resourc':51 'return':162,186 'scheme':71 'second':213 'sentiment':110 'settl':41 'shot':69 'span':104 'specif':50,176 'subscript':57,76 'subscription-rel':56 'substant':168 'suggest':54 'suit':101 'summar':112 'though':60 'timeout':215 'token':121 'unclear':179 'unit':86 'usd':94 'usdc':14,28,44,88,204 'usdc-base' 'use':64,203 'util':127 'valid':129 'version':192 'via':150 'wallet':165,201 'web3':116 'x402':2,16,39,62,151,189 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"60f8f993-fe30-41a1-98a0-de6a60d4c1b7","listingId":"13a0c1b3-fb52-4a17-92f3-abf81f65de6c","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/88","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:58.460Z"}],"sources":[{"listingId":"13a0c1b3-fb52-4a17-92f3-abf81f65de6c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/88","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:58.460Z","lastSeenAt":"2026-04-22T15:02:04.706Z"}],"details":{"listingId":"13a0c1b3-fb52-4a17-92f3-abf81f65de6c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/88 \\\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 a valid x402 challenge with version 1, accepting POST, on Base network with USDC","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/88"},{"claim":"Price is $0.02 per request, no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/88"},{"claim":"Payment directed to wallet 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/88"}],"useCases":["Programmatic access to premium API functionality via x402 micropayments","Agent-driven API consumption without API keys or accounts","On-chain settled per-request API billing"],"bestFor":["Agents or bots that need keyless, pay-per-call API access","Developers wanting to test x402 payment flows on Base","Use cases requiring no signup or rate-limit-free access"],"notFor":["Users needing detailed API documentation or schemas before purchasing","High-volume consumers who would benefit from bulk pricing or subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:48.154Z"},"updatedAt":"2026-04-22T15:02:04.706Z"}}