{"id":"e0cfa34e-3a19-4094-97d5-ee238141ae38","shortId":"6Wxxc2","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. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a variety of APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all gated via the x402 protocol on the Base network and settled in USDC.\n\nThe specific endpoint `/api/v1/stripe/subscriptions/181` is labeled \"Premium API Access\" in its x402 challenge. The challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform's landing page confirms a flat $0.02/request pricing model with no API keys, no rate limits, and instant access. Payment is made via the x402 exact scheme to the specified payTo address.\n\nHowever, the actual functionality behind this particular endpoint is unclear. The name \"Premium API Access\" and the path segment \"stripe/subscriptions/181\" suggest it may relate to subscription management or a premium tier, but no documentation, request/response schemas, or examples are available. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. Without further documentation, the precise input parameters and response format remain unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-request-pricing","no-api-key-required"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-request API","USDC API access","Base network API","lowpaymentfee","crypto-paid API","402 payment API"],"warnings":["No documentation available — docs, API, pricing, and README pages all return only 'Connect wallet' with no content.","The actual functionality behind 'Premium API Access' at /api/v1/stripe/subscriptions/181 is unknown; the endpoint name and path suggest subscription management but this is unconfirmed.","No request or response schema is provided; callers cannot know what parameters to send or what to expect back.","No OpenAPI spec or AI plugin manifest found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/181","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/181","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, confirming pricing and network details. However, there is no documentation, no request/response schema, and no explanation of what \"Premium API Access\" actually returns. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/request':131 '0.02':115,130 '000':104 '0x8335':109 '20':103 '2913':110 '402 payment API' '6':120 'Base network API' 'USDC API access' 'access':6,20,36,91,143,171 'actual':159 'address':156 'advertis':98 'ai':61 'analyt':60 'api':5,19,35,57,90,136,170,199 'avail':196 'base':8,22,77,105,112 'base-network' 'behind':37,161 'challeng':95,97 'confirm':127 'connect':208 'content':214 'cost':101 'crypto-paid API' 'data':59 'decim':121 'doc':198 'document':190,217 'endpoint':30,46,85,164 'equal':114 'exact':150 'exampl':194 'financ':64 'flat':129 'format':224 'function':160 'gate':3,17,70 'host':53 'howev':157 'infrastructur':67 'input':220 'instant':142 'key':137 'label':88 'land':125 'learn':63 'limit':140 'lowpaymentfee' 'lowpaymentfee.com':32,50 'machin':62 'made':146 'manag':183 'mani':45 'maximum':100 'may':179 'model':133 'name':168 'network':78 'no-api-key-required' 'offer':47 'one':43 'page':126,203 'paid':9,23 'paramet':221 'particular':163 'path':174 'pay-per-request API' 'payment':144 'payto':155 'paywal':40 'per':11,25,116 'per-request':10,24 'per-request-pricing' 'platform':51,123 'precis':219 'premium':4,18,34,89,169,186 'price':132,200 'prompt':210 'protocol':74 'provid':33 'rate':139 'readm':202 'relat':180 'remain':225 'request':12,26,117 'request/response':191 'respons':223 'return':205 'schema':192 'scheme':151 'segment':175 'settl':80 'span':58 'specif':84 'specifi':154 'stripe/subscriptions/181':176 'subscript':182 'substant':213 'suggest':177 'tier':187 'unclear':166 'unit':106 'unknown':226 'usdc':14,28,82,108,118 'usdc-settlement' 'use':119 'util':68 'varieti':55 'via':71,147 'wallet':209 'web3':65 'without':215 'x402':2,16,39,73,94,149 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"459ff236-997b-4878-8e30-964f142d4b84","listingId":"e0cfa34e-3a19-4094-97d5-ee238141ae38","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/181","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:36.708Z"}],"sources":[{"listingId":"e0cfa34e-3a19-4094-97d5-ee238141ae38","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/181","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:36.708Z","lastSeenAt":"2026-04-22T15:02:03.562Z"}],"details":{"listingId":"e0cfa34e-3a19-4094-97d5-ee238141ae38","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/181 \\\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":"The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/181"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/181"},{"claim":"The platform offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-call USDC micropayments on Base","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-call 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 or guaranteed SLAs before purchasing","Anyone without a Base-compatible USDC wallet","Use cases requiring free or trial access to evaluate the endpoint"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:49.284Z"},"updatedAt":"2026-04-22T15:02:03.562Z"}}