{"id":"b43908ee-f920-44f0-ab13-ccd865afc855","shortId":"KD3hzR","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\" via the x402 payment protocol. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a variety of API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. All endpoints on the platform are pay-per-request with no API keys, no rate limits, and instant access, settled on the Base network using USDC.\n\nThe specific endpoint `/api/v1/stripe/subscriptions/20` returns a valid x402 challenge with a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the platform's advertised pricing of $0.02/request across all endpoints. Payment is made via the x402 \"exact\" scheme to the specified payTo address.\n\nHowever, the actual functionality behind this specific endpoint path (`/stripe/subscriptions/20`) is unclear. The path suggests it may relate to Stripe subscription management, but no documentation, request schema, or response schema is available beyond the x402 challenge metadata. The crawled docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. Without further documentation, the exact input parameters and response format remain unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","http-post"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC API access","Base network API","micropayment API","lowpaymentfee"],"warnings":["No documentation available — docs, API, pricing, and README pages all returned only 'Connect wallet' with no content.","The endpoint path '/api/v1/stripe/subscriptions/20' suggests Stripe subscription functionality but no details are provided about what it actually does.","No request or response schema available; input parameters and output format are unknown.","This endpoint is not listed among the advertised APIs on the landing page, raising questions about its intended use."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/20","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/20","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 per request). However, there is no documentation, no request/response schema, and the actual functionality behind this specific path is entirely unclear. The crawled pages beyond the landing page were empty (just 'Connect wallet'). This is effectively a stub 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'/request':142 '/stripe/subscriptions/20':168 '0.02':130,141 '000':113 '0x8335':118 '20':112 '2913':119 '6':125 'Base network API' 'USDC API access' 'access':6,20,36,90 'across':143 'actual':161 'address':158 'advertis':138 'ai':63 'amount':110 'analyt':62 'api':5,19,35,58,83,199 'avail':190 'base':8,22,94,114,121 'base-network' 'behind':163 'beyond':191 'call':12,26 'categori':59 'challeng':106,194 'connect':208 'consist':133 'content':214 'crawl':197 'data':61 'decim':126 'doc':198 'document':183,217 'endpoint':30,47,72,100,145,166 'exact':152,219 'financ':66 'format':224 'function':162 'gate':3,17 'host':54 'howev':159 'http-post' 'includ':60 'infrastructur':69 'input':220 'instant':89 'key':84 'learn':65 'limit':87 'lowpaymentfee' 'lowpaymentfee.com':32,51 'machin':64 'made':148 'manag':180 'mani':46 'maximum':109 'may':175 'metadata':195 'micropayment API' 'network':95 'no-api-key' 'offer':48 'one':44 'page':203 'paid':9,23 'paramet':221 'path':167,172 'pay':78 'pay-per-call API' 'pay-per-request':77 'payment':40,146 'payto':157 'per':11,25,79,131 'per-cal':10,24 'platform':52,75,136 'premium':4,18,34 'price':139,200 'prompt':210 'protocol':41 'provid':33 'rate':86 'readm':202 'relat':176 'remain':225 'request':80,132,184 'respons':187,223 'return':102,205 'schema':185,188 'scheme':153 'settl':91 'sinc':122 'specif':99,165 'specifi':156 'stripe':178 'subscript':179 'substant':213 'suggest':173 'translat':128 'unclear':170 'unit':115 'unknown':226 'usdc':14,28,97,117,123 'usdc-settlement' 'use':96,124 'util':70 'valid':104 'varieti':56 'via':37,149 'wallet':209 'web3':67 'without':215 'x402':2,16,39,105,151,193 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"dd917e32-b9ed-492e-a9da-225c54de0653","listingId":"b43908ee-f920-44f0-ab13-ccd865afc855","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/20","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:44.653Z"}],"sources":[{"listingId":"b43908ee-f920-44f0-ab13-ccd865afc855","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/20","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:44.653Z","lastSeenAt":"2026-04-22T12:04:25.353Z"}],"details":{"listingId":"b43908ee-f920-44f0-ab13-ccd865afc855","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/20\n# Returns 402 with x402 challenge; include X-PAYMENT header with valid payment proof to access.","exampleRequest":null,"exampleResponse":{"error":"X-PAYMENT header is required","accepts":[{"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/20","description":"Premium API Access","maxAmountRequired":"20000","maxTimeoutSeconds":300}],"x402Version":1},"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (USD Coin) on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/20"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/20"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to platform services"],"bestFor":["Developers wanting keyless, pay-per-use API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation before integrating","Applications requiring free or fiat-only payment methods","High-volume use cases where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:48.821Z"},"updatedAt":"2026-04-22T12:04:25.353Z"}}