{"id":"c2824875-932d-482c-966f-5e8b5f5e9d07","shortId":"aQk6Fe","kind":"x402","title":"x402-gated Stripe invoice endpoint on Base, paid per-call in USDC.","tagline":"x402-gated Stripe invoice endpoint on Base, paid per-call in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 payment wall. The specific resource `/api/v1/stripe/invoices/16` appears to be part of a broader platform that offers dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints on the platform use the x402 protocol and settle payments in USDC on the Base network.\n\nThe x402 challenge for this particular endpoint advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request — consistent with the site's uniform $0.02/request pricing. Payment is made via the \"exact\" scheme to wallet 0x1A2B…85F3 with a 300-second timeout. The endpoint accepts HTTP POST requests and returns application/json.\n\nThe platform advertises no API keys, no rate limits, and instant access. However, documentation pages (/docs, /pricing, /api, /README) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual request/response schemas for this invoice endpoint are unknown. It is unclear what data or functionality the `/stripe/invoices/16` resource specifically returns — the name suggests it may relate to Stripe invoice data, but no documentation confirms this.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-call-pricing","stripe-invoices","json-response","http-post"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 paid API","USDC micropayment API","pay-per-call API","Base network API","lowpaymentfee","crypto payment endpoint"],"warnings":["No request or response schema available — the endpoint's actual functionality is undocumented","All documentation pages (/docs, /pricing, /api, /README) returned only 'Connect wallet' with no substantive content","The specific resource '/api/v1/stripe/invoices/16' purpose is unclear — it may be a demo or placeholder","Cannot verify what data the endpoint returns without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/16","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/invoices/16","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what this endpoint actually accepts or returns. All doc pages show only 'Connect wallet' with no content. The specific purpose of /stripe/invoices/16 is 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'/api/v1/stripe/invoices/16':45 '/docs':167 '/pricing':168 '/readme':170 '/request':125 '/stripe/invoices/16':201 '0.02':115,124 '000':104 '0x1a2b':136 '0x8335':109 '20':103 '2913':110 '300':140 '85f3':137 'Base network API' 'USDC micropayment API' 'accept':145 'access':36,163 'actual':184 'advertis':98,154 'ai/ml':66 'analyt':65 'api':35,62,156 'appear':46 'application/json':151 'base':8,22,89,105,112 'base-network' 'behind':37 'broader':52 'call':12,26,61 'challeng':93 'confirm':218 'connect':175 'consist':118 'content':181 'cost':101 'crypto payment endpoint' 'data':64,69,197,214 'document':165,217 'dozen':56 'endpoint':6,20,30,74,97,144,190 'equal':114 'exact':132 'finance/web3':68 'function':199 'gate':3,17 'howev':164 'http':146 'http-post' 'infer':67 'instant':162 'invoic':5,19,189,213 'json-response' 'key':157 'limit':160 'lowpaymentfee' 'lowpaymentfee.com':32 'made':129 'maximum':100 'may':209 'name':206 'network':90 'offer':55 'page':166 'paid':9,23 'part':49 'particular':96 'pay':59 'pay-per-cal':58 'pay-per-call API' 'payment':40,84,127 'per':11,25,60,116 'per-cal':10,24 'per-call-pricing' 'platform':53,77,153 'post':147 'premium':34 'price':126 'prompt':177 'protocol':81 'provid':33 'rate':159 'relat':210 'request':117,148 'request/response':185 'resourc':44,202 'return':150,172,204 'schema':186 'scheme':133 'second':141 'servic':72 'settl':83 'site':121 'span':63 'specif':43,203 'stripe':4,18,212 'stripe invoice API' 'stripe-invoices' 'substant':180 'suggest':207 'timeout':142 'unclear':195 'uniform':123 'unit':106 'unknown':192 'usdc':14,28,86,108 'usdc-settlement' 'use':78 'util':71 'via':130 'wall':41 'wallet':135,176 'x402':2,16,39,80,92 'x402 paid API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"5d48f670-3cbe-4101-b4ad-6e71ffa1f655","listingId":"c2824875-932d-482c-966f-5e8b5f5e9d07","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/invoices/16","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:55:41.457Z"}],"sources":[{"listingId":"c2824875-932d-482c-966f-5e8b5f5e9d07","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/16","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:41.457Z","lastSeenAt":"2026-04-25T13:03:04.269Z"}],"details":{"listingId":"c2824875-932d-482c-966f-5e8b5f5e9d07","quickStartSnippet":"# The endpoint requires an x402 payment header (USDC on Base, $0.02/call)\ncurl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/16 \\\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 x402 challenge advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/16"},{"claim":"The platform advertises uniform $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages returned only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving Stripe invoice data via a pay-per-call model without API keys","Programmatic access to invoice information settled in USDC on Base","Agent-driven invoice lookups with x402 micropayments"],"bestFor":["Developers wanting keyless, pay-per-request API access","Agents that can settle x402 payments in USDC on Base","Use cases requiring low-cost per-call pricing ($0.02/request)"],"notFor":["Users who need detailed API documentation or request/response schemas before integrating","High-volume use cases where subscription pricing would be more economical"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:51.815Z"},"updatedAt":"2026-04-25T13:03:04.269Z"}}