{"id":"c4b07a58-4c88-447d-aa5a-5176c5e280bc","shortId":"HuEuwa","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 part of a broader platform that offers multiple API categories including 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/183` is listed as \"Premium API Access\" and costs up to $0.02 per request (maxAmountRequired of 20,000 base units of USDC with 6 decimals = $0.02). Payment is made via the x402 exact scheme: callers include an X-PAYMENT header with a signed USDC payment on Base to the provider's address. No API keys, rate limits, or upfront commitments are required — access is instant upon payment.\n\nThe platform advertises a uniform $0.02/request pricing model across all its endpoints. Documentation pages (/docs, /pricing, /api, /README) all appear to require wallet connection and contain no additional content. The endpoint's actual response payload and input parameters are not documented in any captured material, so the precise functionality behind \"Premium API Access\" (as distinct from the other listed endpoints) remains unclear. The outputSchema indicates it accepts HTTP POST requests and is discoverable.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-request-pricing","http-post","no-api-key","subscription-management"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-request API","USDC API access","Base network API","lowpaymentfee","crypto-paid API","402 payment endpoint"],"warnings":["No API documentation available — all doc pages (/docs, /pricing, /api, /README) show only 'Connect wallet' with no content","The endpoint path includes 'stripe/subscriptions' but the payment mechanism is x402/USDC on Base, not Stripe — the naming is confusing","No request or response schema is documented; actual functionality is unknown","The 'Premium API Access' label is generic and does not describe what the endpoint does"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/183","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/183","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) with clear pricing ($0.02 USDC on Base), but there is no documentation of request/response schemas, no OpenAPI spec, and all doc pages require wallet connection with no visible content. The actual functionality behind 'Premium API Access' is 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'/api/v1/stripe/subscriptions/183':81 '/docs':164 '/pricing':165 '/readme':167 '/request':155 '0.02':92,106,154 '000':98 '20':97 '402 payment endpoint' '6':104 'Base network API' 'USDC API access' 'accept':216 'access':6,20,36,87,144,202 'across':158 'actual':182 'addit':177 'address':133 'advertis':151 'ai':56 'analyt':55 'api':5,19,35,51,86,135,201 'appear':169 'base':8,22,72,99,128 'base-network' 'behind':37,199 'broader':46 'caller':115 'captur':193 'categori':52 'commit':141 'connect':173 'contain':175 'content':178 'cost':89 'crypto-paid API' 'data':54 'decim':105 'discover':222 'distinct':204 'document':162,190 'endpoint':30,80,161,180,209 'exact':113 'financ':59 'function':198 'gate':3,17,65 'header':121 'http':217 'http-post' 'includ':53,116 'indic':214 'infrastructur':62 'input':186 'instant':146 'key':136 'learn':58 'limit':138 'list':83,208 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':57 'made':109 'materi':194 'maxamountrequir':95 'model':157 'multipl':50 'network':73 'no-api-key' 'offer':49 'outputschema':213 'page':163 'paid':9,23 'paramet':187 'part':43 'pay-per-request API' 'payload':184 'payment':107,120,126,148 'paywal':40 'per':11,25,93 'per-request':10,24 'per-request-pricing' 'platform':47,150 'post':218 'precis':197 'premium':4,18,34,85,200 'price':156 'protocol':69 'provid':33,131 'rate':137 'remain':210 'request':12,26,94,219 'requir':143,171 'respons':183 'scheme':114 'settl':75 'sign':124 'specif':79 'subscription-management' 'unclear':211 'uniform':153 'unit':100 'upfront':140 'upon':147 'usdc':14,28,77,102,125 'usdc-settlement' 'util':63 'via':66,110 'wallet':172 'web3':60 'x':119 'x-payment':118 'x402':2,16,39,68,112 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"fa18b08c-dba1-4e4e-9e7c-208b7499105c","listingId":"c4b07a58-4c88-447d-aa5a-5176c5e280bc","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/183","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:36.727Z"}],"sources":[{"listingId":"c4b07a58-4c88-447d-aa5a-5176c5e280bc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/183","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:36.727Z","lastSeenAt":"2026-04-22T15:02:03.590Z"}],"details":{"listingId":"c4b07a58-4c88-447d-aa5a-5176c5e280bc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/183 \\\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 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/183"},{"claim":"The platform advertises $0.02/request 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","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/183"}],"useCases":["Agents that need on-demand premium API access without pre-registration or API keys","Programmatic access to subscription-related functionality paid in USDC on Base","Integrating pay-per-call APIs into crypto-native workflows"],"bestFor":["Crypto-native agents and bots that can sign USDC transactions on Base","Developers wanting zero-commitment, pay-as-you-go API access","Automated systems that need keyless, instant API access"],"notFor":["Users who need detailed API documentation before integrating","Applications requiring fiat-only payment rails","High-volume use cases where per-request crypto payments add unacceptable latency"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:49.18Z"},"updatedAt":"2026-04-22T15:02:03.590Z"}}