{"id":"0a2a27a5-9a02-4ac9-afb5-48fea8a573f1","shortId":"dFszgE","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. The endpoint is live and returns a standard x402 challenge requiring payment in USDC on the Base network. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 per request.\n\nThe provider's landing page advertises a broad catalog of pay-per-call 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 the Base network.\n\nHowever, the specific endpoint `/api/v1/stripe/subscriptions/162` is labeled only as \"Premium API Access\" with no further documentation about what it actually returns or what input it expects. The docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response examples, and no detailed documentation available. The endpoint accepts POST requests and returns application/json, but the actual functionality behind this particular subscription endpoint is unclear.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-billing","post-endpoint","json-response"],"categories":["api-gateway","payments"],"synonyms":["lowpaymentfee","x402 api","pay-per-call api","usdc api access","base network api","micropayment api","premium api"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content.","The specific functionality of /api/v1/stripe/subscriptions/162 is completely undocumented; 'Premium API Access' is the only description.","No OpenAPI spec or request/response schema provided.","The endpoint path includes 'stripe/subscriptions' which may imply Stripe integration, but this is unconfirmed."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/162","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/162","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is zero documentation about what the endpoint actually does, no request/response schema, and no examples. The label 'Premium API Access' is generic and uninformative. Docs pages are empty beyond a wallet connect 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'0.02':76,127 '000':67 '20':66 '6':72 'accept':203 'access':6,20,36,139,155 'actual':163,211 'advertis':84 'ai':97 'amount':61 'analysi':101 'analyt':96 'api':5,19,35,93,132,154,173 'application/json':208 'avail':200 'base':8,22,57,68,142 'base network api' 'behind':37,213 'broad':86 'call':64,92 'catalog':87 'challeng':50 'classif':103 'connect':181 'content':187 'convers':120 'data':95 'decim':73 'detail':198 'doc':171 'document':159,199 'embed':104 'endpoint':30,42,123,147,202,217 'equal':75 'estim':114 'exampl':195 'exchang':109 'expect':169 'feed':108 'financ':105 'function':212 'gas':113 'gate':3,17 'generat':121 'geocod':118 'howev':144 'infrastructur':116 'input':167 'instant':138 'json-response' 'key':133 'label':150 'land':82 'learn':99 'limit':136 'list':125 'live':44 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':98 'maximum':60 'micropayment api' 'network':58,143 'openapi':191 'page':83,176 'paid':9,23 'particular':215 'pay':90 'pay-per-cal':89 'pay-per-call api' 'payment':52 'paywal':40 'per':11,25,63,77,91,128 'per-request':10,24 'per-request-billing' 'post':204 'post-endpoint' 'premium':4,18,34,153 'premium api' 'price':107,172 'prompt':183 'provid':33,80 'quot':112 'rate':110,135 'readm':175 'render':178 'request':12,26,78,129,205 'request/response':194 'requir':51,62 'return':46,164,207 'sentiment':100 'span':94 'spec':192 'specif':146 'standard':48 'subscript':216 'substant':186 'summar':102 'token':111 'unclear':219 'unit':69 'usdc':14,28,54,71 'usdc api access' 'usdc-base' 'util':117 'valid':119 'via':140 'wallet':182 'web3':106 'x402':2,16,39,49 'x402 api' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"da25633f-6d0f-40c9-9893-fcae7b992891","listingId":"0a2a27a5-9a02-4ac9-afb5-48fea8a573f1","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/162","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:27.699Z"}],"sources":[{"listingId":"0a2a27a5-9a02-4ac9-afb5-48fea8a573f1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/162","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:27.699Z","lastSeenAt":"2026-04-22T16:31:56.037Z"}],"details":{"listingId":"0a2a27a5-9a02-4ac9-afb5-48fea8a573f1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/162\n# Returns 402 with x402 challenge; attach X-PAYMENT header with valid USDC payment on Base to access.","exampleRequest":null,"exampleResponse":{"error":"X-PAYMENT header is required","accepts":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","description":"Premium API Access","maxAmountRequired":"20000","maxTimeoutSeconds":300}],"x402Version":1},"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns x402 challenge with maxAmountRequired of 20000 base units USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/162"},{"claim":"Provider advertises $0.02 per request pricing with no API keys, no rate limits, instant access on Base","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/162"},{"claim":"Provider lists APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven API consumption without API keys or subscriptions","Programmatic pay-as-you-go access to data or services"],"bestFor":["Developers wanting keyless, pay-per-call API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over traditional API subscriptions"],"notFor":["Users needing detailed API documentation before committing","Anyone without a Base-compatible USDC wallet","High-volume consumers who need bulk pricing or rate guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:49.624Z"},"updatedAt":"2026-04-22T16:31:56.037Z"}}