{"id":"2a83a16d-a7a8-43b3-b6af-79fbfe3724ba","shortId":"df4vCr","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 several 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 endpoints on the platform use the x402 protocol to accept per-request payments in USDC on the Base network, requiring no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint `/api/v1/stripe/subscriptions/14` is labeled \"Premium API Access\" in the x402 challenge. Its maximum cost is 20,000 base units of USDC (0.02 USD per request), consistent with the platform's uniform $0.02/request pricing. The endpoint accepts POST requests and returns application/json. Payment is made via the x402 exact scheme to the specified wallet address on Base.\n\nDocumentation on the platform is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no description of what \"Premium API Access\" actually does or what parameters it accepts. The endpoint name suggests it may relate to Stripe subscription management, but this is speculative. Without documentation, the actual functionality of this endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-billing","json-response","post-method"],"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 — all doc pages render only 'Connect wallet' with no content","No OpenAPI spec or request/response schema provided","The actual functionality of 'Premium API Access' at /api/v1/stripe/subscriptions/14 is unknown","The endpoint path suggests Stripe subscription management but this is unconfirmed"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/14","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/14","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 challenge, but there is zero documentation on what the endpoint actually does, what request body it expects, or what it returns. The docs/pricing/README pages are all blank behind a wallet-connect gate. Functionality is entirely 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'/request':136 '0.02':125,135 '000':120 '20':119 'Base network API' 'USDC API access' 'accept':80,140,209 'access':6,20,36,110,202 'actual':203,228 'address':158 'ai':62 'analyt':61 'api':5,19,35,58,93,109,170,201 'application/json':145 'base':8,22,89,121,160 'call':12,26 'challeng':114 'commit':101 'connect':179 'consist':129 'content':185 'cost':117 'data':60 'descript':197 'doc':169 'document':161,194,226 'endpoint':30,47,71,104,139,211,232 'exact':152 'extrem':166 'financ':65 'function':229 'gate':3,17 'host':54 'infrastructur':68 'json-response' 'key':94 'label':107 'learn':64 'limit':97 'lowpaymentfee' 'lowpaymentfee.com':32,51 'machin':63 'made':148 'manag':220 'maximum':116 'may':215 'micropayment API' 'name':212 'network':90 'offer':48 'one':44 'openapi':189 'page':174 'paid':9,23 'paramet':207 'pay-per-call API' 'payment':40,84,146 'per':11,25,82,127 'per-cal':10,24 'per-request':81 'per-request-billing' 'platform':52,74,132,164 'post':141 'post-method' 'premium':4,18,34,108,200 'premium API' 'price':137,171 'prompt':181 'protocol':41,78 'provid':33 'rate':96 'readm':173 'relat':216 'remain':233 'render':176 'request':83,128,142 'request/response':192 'requir':91 'return':144 'schema':193 'scheme':153 'sever':46 'span':59 'spars':167 'spec':190 'specif':103 'specifi':156 'specul':224 'stripe':218 'subscript':219 'suggest':213 'unclear':234 'uniform':134 'unit':122 'upfront':100 'usd':126 'usdc':14,28,86,124 'usdc-base' 'use':75 'util':69 'varieti':56 'via':37,149 'wallet':157,180 'web3':66 'without':225 'x402':2,16,39,77,113,151 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"a3205116-f335-46b0-a668-f7f821c45746","listingId":"2a83a16d-a7a8-43b3-b6af-79fbfe3724ba","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/14","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:29.464Z"}],"sources":[{"listingId":"2a83a16d-a7a8-43b3-b6af-79fbfe3724ba","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/14","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:29.464Z","lastSeenAt":"2026-04-22T16:31:56.121Z"}],"details":{"listingId":"2a83a16d-a7a8-43b3-b6af-79fbfe3724ba","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/14 \\\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/14"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/14"},{"claim":"Docs, API, pricing, and README pages all show only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-request for API access without needing API keys or subscriptions","Programmatic access to a premium endpoint settled in USDC on Base","Agent-driven API consumption with x402 payment flow"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over traditional billing"],"notFor":["Anyone needing documented request/response schemas before integrating","Users who cannot transact in USDC on the Base network","Production use cases requiring SLA guarantees or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:49.516Z"},"updatedAt":"2026-04-22T16:31:56.121Z"}}