{"id":"c1feaeff-eba8-407e-87ea-a0059744770b","shortId":"ej2xpN","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\" 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 settlement on the Base network using USDC.\n\nThe specific endpoint `/api/v1/stripe/subscriptions/9` is labeled \"Premium API Access\" and costs $0.02 per request (20,000 base units of USDC with 6 decimals). Payment is made via the x402 exact scheme: callers include an X-PAYMENT header with a signed payment to the provider's address on Base. The endpoint accepts POST requests and returns application/json responses.\n\nDocumentation on the platform is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what \"Premium API Access\" actually returns or what input it expects. The endpoint is live (returns a valid 402 challenge), but without documentation it is unclear what functionality this specific route provides beyond its name.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-request-billing","no-api-key","json-response"],"categories":["api-gateway","payments"],"synonyms":["premium API","x402 API","pay-per-request API","USDC API access","lowpaymentfee","Base network API","crypto-paid API"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content.","The purpose of 'Premium API Access' at /api/v1/stripe/subscriptions/9 is entirely unclear; the name suggests subscription management but nothing confirms this.","No request or response schema is available; callers cannot know what to send or expect back.","No OpenAPI or ai-plugin manifest found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/9","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/9","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, but there is zero documentation on what the endpoint actually does, what inputs it accepts, or what it returns. No OpenAPI schema, no examples, and all doc pages are empty. The listing is effectively a 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'0.02':107 '000':111 '20':110 '402':209 '6':117 'Base network API' 'USDC API access' 'accept':147 'access':6,20,36,104,194 'actual':195 'address':142 'ai':63 'analyt':62 'api':5,19,35,58,83,103,164,193 'application/json':152 'base':8,22,92,112,144 'base-network' 'beyond':223 'caller':127 'categori':59 'challeng':210 'connect':172 'content':178 'cost':106 'crypto-paid API' 'data':61 'decim':118 'descript':189 'doc':162 'document':154,213 'endpoint':30,47,72,98,146,203 'exact':125 'exampl':186 'expect':201 'extrem':159 'financ':66 'function':218 'gate':3,17 'header':133 'host':54 'includ':60,128 'infrastructur':69 'input':199 'json-response' 'key':84 'label':101 'learn':65 'limit':87 'live':205 'lowpaymentfee' 'lowpaymentfee.com':32,51 'machin':64 'made':121 'mani':46 'name':225 'network':93 'no-api-key' 'offer':48 'one':44 'openapi':182 'page':167 'paid':9,23 'pay':78 'pay-per-request':77 'pay-per-request API' 'payment':40,119,132,137 'per':11,25,79,108 'per-request':10,24 'per-request-billing' 'platform':52,75,157 'post':148 'premium':4,18,34,102,192 'premium API' 'price':163 'prompt':174 'protocol':41 'provid':33,140,222 'rate':86 'readm':166 'render':169 'request':12,26,80,109,149 'request/response':185 'respons':153 'return':151,196,206 'rout':221 'schema':183 'scheme':126 'settlement':89 'sign':136 'spars':160 'specif':97,220 'unclear':216 'unit':113 'usdc':14,28,95,115 'usdc-settlement' 'use':94 'util':70 'valid':208 'varieti':56 'via':37,122 'wallet':173 'web3':67 'without':212 'x':131 'x-payment':130 'x402':2,16,39,124 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"87aa4a7d-349b-47b9-bfd9-b7d36947e406","listingId":"c1feaeff-eba8-407e-87ea-a0059744770b","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/9","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:00.857Z"}],"sources":[{"listingId":"c1feaeff-eba8-407e-87ea-a0059744770b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/9","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:00.857Z","lastSeenAt":"2026-04-22T08:31:38.270Z"}],"details":{"listingId":"c1feaeff-eba8-407e-87ea-a0059744770b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/9 \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\" \\\n  -H \"Content-Type: application/json\"","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/9"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/9"},{"claim":"Docs, pricing, API, and README pages render only 'Connect wallet' with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing a premium API endpoint with per-call USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic access to a subscription-like resource via x402 payment protocol"],"bestFor":["Developers or agents wanting keyless, pay-per-use API access","x402-compatible clients on the Base network","Scenarios requiring no upfront commitment or rate-limit constraints"],"notFor":["Users who need detailed API documentation or request/response schemas before integrating","Use cases requiring non-crypto payment methods","Anyone needing to understand exactly what data this endpoint returns before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:48.082Z"},"updatedAt":"2026-04-22T08:31:38.270Z"}}