{"id":"eb052b37-a66b-414b-bf57-aa1c206d507e","shortId":"A7ZygV","kind":"x402","title":"x402-gated Stripe invoice endpoint on Base, paying per-call in USDC.","tagline":"x402-gated Stripe invoice endpoint on Base, paying per-call in USDC.","description":"This endpoint at lowpaymentfee.com exposes a Stripe invoice resource (`/api/v1/stripe/invoices/97`) behind an x402 paywall. When called without payment, it returns a 402 challenge requesting USDC on the Base network. The endpoint accepts POST requests and returns JSON.\n\nThe specific endpoint listed here appears to be a single Stripe invoice resource (invoice ID 97), which is distinct from the broader suite of APIs advertised on the lowpaymentfee.com homepage (analytics, AI/ML, finance, infrastructure utilities). The site advertises a flat $0.02 per request across its API catalog, and this endpoint's x402 challenge specifies a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 — consistent with the site's stated pricing.\n\nThe provider's landing page lists numerous API categories including data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto data feeds, and infrastructure utilities. However, this specific listing is for a Stripe invoices endpoint, which does not appear in the homepage catalog. Documentation pages (/docs, /pricing, /api, /README) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual behavior and response schema of this endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","stripe-invoices","per-call-pricing","json-response"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 paid endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["No documentation available — all doc pages return only 'Connect wallet'","This specific endpoint (/api/v1/stripe/invoices/97) is not listed in the provider's homepage API catalog","No response schema or example responses available","Unknown what data this endpoint actually returns","Endpoint references a single invoice ID (97), unclear if this is a demo or production resource"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/97","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/97","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no response schema, no example responses, and the specific endpoint (Stripe invoices/97) is not listed in the provider's own catalog. All doc pages returned only 'Connect wallet' with no 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'/api/v1/stripe/invoices/97':38 '/docs':186 '/pricing':187 '/readme':189 '0.02':106,133 '000':124 '20':123 '402':50 '6':129 '97':81 'Base network API' 'USDC micropayment API' 'accept':60 'across':109 'actual':203 'advertis':91,103 'ai/ml':97,153 'analysi':156 'analyt':96,152 'api':90,111,148 'appear':71,179 'base':8,22,56,125 'behavior':204 'behind':39 'broader':87 'call':12,26,44 'catalog':112,183 'categori':149 'challeng':51,118 'classif':158 'connect':194 'consist':134 'content':200 'data':151,161 'decim':130 'distinct':84 'document':184 'embed':159 'endpoint':6,20,30,59,68,115,175,210 'equal':132 'expos':33 'feed':162 'financ':98 'finance/crypto':160 'flat':105 'gate':3,17 'homepag':95,182 'howev':166 'id':80 'includ':150 'infer':154 'infrastructur':99,164 'invoic':5,19,36,77,79,174 'json':65 'json-response' 'land':144 'list':69,146,169 'lowpaymentfee' 'lowpaymentfee.com':32,94 'maxamountrequir':121 'network':57 'numer':147 'page':145,185 'pay':9,23 'pay-per-call API' 'payment':46 'paywal':42 'per':11,25,107 'per-cal':10,24 'per-call-pricing' 'post':61 'price':140 'prompt':196 'provid':142 'request':52,62,108 'resourc':37,78 'respons':206 'return':48,64,191 'schema':207 'sentiment':155 'singl':75 'site':102,137 'specif':67,168 'specifi':119 'state':139 'stripe':4,18,35,76,173 'stripe invoice API' 'stripe-invoices' 'substant':199 'suit':88 'summar':157 'unit':126 'unknown':212 'usdc':14,28,53,128 'usdc-base' 'util':100,165 'wallet':195 'without':45 'x402':2,16,41,117 'x402 paid endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"86243856-56bf-43a1-beaf-eaa6526b81cd","listingId":"eb052b37-a66b-414b-bf57-aa1c206d507e","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/97","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:13.290Z"}],"sources":[{"listingId":"eb052b37-a66b-414b-bf57-aa1c206d507e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/97","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:13.290Z","lastSeenAt":"2026-04-25T05:33:15.782Z"}],"details":{"listingId":"eb052b37-a66b-414b-bf57-aa1c206d507e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/97\n# Returns 402 with x402 challenge; attach X-PAYMENT header with USDC payment proof to access.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The site advertises $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/97"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) returned only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving Stripe invoice data via a pay-per-call x402 flow","Demonstrating x402 protocol integration with USDC on Base","Agent-driven invoice lookup without API keys"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-per-call access to invoice data","Projects already using USDC on Base"],"notFor":["Production Stripe invoice management (use Stripe's own API directly)","Users who need detailed documentation or response schemas before integrating","High-volume invoice retrieval where per-call fees add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:50.304Z"},"updatedAt":"2026-04-25T05:33:15.782Z"}}