{"id":"5cdf95a2-f429-4ba8-924a-6eecb3fc729a","shortId":"eQv9xK","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 advertises a suite of APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all gated behind x402 micropayments settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/stripe/subscriptions/51` is labeled \"Premium API Access\" and requires a payment of up to 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 flat pricing of $0.02/request across all endpoints. Payment is made via the x402 exact scheme, with a 300-second timeout window. The endpoint accepts POST requests and returns application/json.\n\nHowever, the actual functionality behind this specific endpoint is unclear. The name \"Premium API Access\" and the path segment \"stripe/subscriptions\" suggest it may relate to subscription management or a Stripe integration, but no documentation, request schema, or response schema is available. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. Without concrete documentation on what this endpoint does, what inputs it expects, or what outputs it returns, agents should treat this as a stub listing with uncertain utility.","tags":[],"capabilities":["x402-payment","usdc-base","per-call-micropayment","json-response","post-method"],"categories":["api","payments"],"synonyms":["premium api","x402 api","lowpaymentfee","micropayment api","pay-per-call api","base usdc api","stripe subscriptions"],"warnings":["No documentation available — docs, API, pricing, and README pages all return only 'Connect wallet' with no content.","The actual functionality of this endpoint is unknown; the name 'Premium API Access' and path 'stripe/subscriptions/51' are ambiguous.","No request or response schema is provided; agents cannot know what inputs to send or what outputs to expect.","No OpenAPI spec, ai-plugin manifest, or agents.txt found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/51","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/51","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it exists and accepts payments. However, there is no documentation, no request/response schema, and the actual functionality behind 'Premium API Access' is entirely undocumented. The docs pages are empty beyond a wallet-connect prompt. This is effectively a 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'/request':129 '0.02':116,128 '000':99 '0x8335':104 '20':98 '2913':105 '300':143 '6':111 'accept':149 'access':6,20,36,90,169 'across':130 'actual':157 'advertis':54,124 'agent':231 'ai':62 'analyt':61 'api':5,19,35,58,89,168,198 'application/json':154 'avail':195 'base':8,22,80,100,107 'base usdc api' 'behind':72,159 'call':12,26 'concret':215 'connect':207 'consist':119 'content':213 'data':60 'decim':112 'doc':197 'document':188,216 'endpoint':30,47,84,132,148,162,220 'exact':139 'expect':225 'financ':65 'flat':125 'function':158 'gate':3,17,71 'howev':155 'infrastructur':68 'input':223 'integr':185 'json-response' 'label':87 'learn':64 'list':238 'lowpaymentfee' 'lowpaymentfee.com':32,51 'machin':63 'made':135 'manag':181 'mani':46 'may':177 'micropay':74 'micropayment api' 'name':166 'network':81 'offer':48 'one':44 'output':228 'page':202 'paid':9,23 'path':172 'pay-per-call api' 'payment':40,94,133 'per':11,25,117 'per-cal':10,24 'per-call-micropayment' 'platform':52,122 'post':150 'post-method' 'premium':4,18,34,88,167 'premium api' 'price':126,199 'prompt':209 'protocol':41 'provid':33 'readm':201 'relat':178 'request':118,151,189 'requir':92 'respons':192 'return':153,204,230 'schema':190,193 'scheme':140 'second':144 'segment':173 'settl':75 'sinc':108 'span':59 'specif':83,161 'stripe':184 'stripe subscriptions' 'stripe/subscriptions':174 'stub':237 'subscript':180 'substant':212 'suggest':175 'suit':56 'timeout':145 'translat':114 'treat':233 'uncertain':240 'unclear':164 'unit':101 'usdc':14,28,77,103,109 'usdc-base' 'use':110 'util':69,241 'via':37,136 'wallet':208 'web3':66 'window':146 'without':214 'x402':2,16,39,73,138 'x402 api' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"741775bd-7a30-4bae-bbbd-666a1fd87815","listingId":"5cdf95a2-f429-4ba8-924a-6eecb3fc729a","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/51","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:46.406Z"}],"sources":[{"listingId":"5cdf95a2-f429-4ba8-924a-6eecb3fc729a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/51","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:46.406Z","lastSeenAt":"2026-04-22T05:31:33.866Z"}],"details":{"listingId":"5cdf95a2-f429-4ba8-924a-6eecb3fc729a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/51 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/51"},{"claim":"The platform advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/51"},{"claim":"Docs, API, pricing, and README pages contain only 'Connect wallet' with no substantive documentation","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-call for API access without API keys or subscriptions","Accessing gated endpoints using USDC micropayments on Base","Programmatic agent-driven API consumption with x402 payment headers"],"bestFor":["Agents that can settle x402 payments in USDC on Base","Developers wanting keyless, pay-per-use API access","Exploring x402 protocol integrations"],"notFor":["Users needing detailed API documentation before committing","Production workloads requiring SLA guarantees or known response schemas","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:48.716Z"},"updatedAt":"2026-04-22T05:31:33.866Z"}}