{"id":"32038c43-6782-4249-b361-abbe7fa55a63","shortId":"urzeJ5","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/35` appears to be a Stripe invoice-related endpoint, though the exact functionality is not documented beyond the generic label. Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 \"exact\" scheme.\n\nThe hosting site lowpaymentfee.com advertises a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment, summarization, classification, embeddings), finance/crypto data feeds, and utility services. All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no commitments. However, this particular invoice endpoint's x402 challenge specifies a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 — consistent with the site-wide pricing.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema, and no usage examples. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what request body is expected or what the response contains. The endpoint accepts POST requests.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","stripe-invoices","pay-per-call"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 invoice endpoint","USDC pay-per-call","lowpaymentfee","crypto-paid API","Base network API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages are all empty","No OpenAPI or request/response schema provided; request body format is unknown","The exact functionality of /api/v1/stripe/invoices/35 is undocumented — 'Premium API Access' is a generic label","Site appears to be a demo or early-stage project with many listed endpoints but no substantive docs"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/35","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/35","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The docs pages are empty beyond a wallet-connect prompt. The specific purpose of this invoice endpoint is 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'/api/v1/stripe/invoices/35':45 '/docs':165 '/pricing':167 '/readme':169 '0.02':117,152 '000':143 '0x8335':76 '20':142 '2913':77 '402':202 '6':148 'Base network API' 'USDC pay-per-call' 'accept':222 'access':36 'advertis':87 'ai/ml':100 'analyt':99 'api':35,96,122 'appear':46 'base':8,22,71,144 'base-network' 'behind':37 'beyond':62 'bodi':212 'broad':89 'call':12,26,95 'catalog':90 'challeng':137,203 'classif':104 'commit':129 'confirm':197 'connect':175 'consist':153 'contain':219 'content':181 'contract':75 'crypto-paid API' 'data':98,107 'decim':149 'document':61,160,206 'embed':105 'endpoint':6,20,30,54,113,134,195,221 'equal':151 'exact':57,81 'exampl':193 'expect':214 'extrem':162 'feed':108 'finance/crypto':106 'function':58 'gate':3,17 'generic':64 'host':84 'howev':130 'infer':101 'invoic':5,19,52,133 'invoice-rel':51 'key':123 'label':65 'limit':126 'list':115 'live':198 'lowpaymentfee' 'lowpaymentfee.com':32,86 'maxamountrequir':140 'network':72 'openapi':185 'page':170 'paid':9,23 'particular':132 'pay':93 'pay-per-cal':92 'pay-per-call' 'payment':40,66 'per':11,25,94,118 'per-cal':10,24 'post':223 'premium':34 'price':159 'prompt':177 'proper':201 'provid':33 'rate':125 'relat':53 'render':172 'request':119,211,224 'request/response':188 'resourc':44 'respons':218 'return':199 'schema':189 'scheme':82 'sentiment':102 'servic':111 'settl':68 'site':85,157 'site-wid':156 'span':97 'spars':163 'spec':186 'specif':43 'specifi':138 'stripe':4,18,50 'stripe invoice API' 'stripe-invoices' 'substant':180 'summar':103 'though':55 'unclear':209 'unit':145 'usag':192 'usdc':14,28,74,147 'usdc-settlement' 'use':73 'util':110 'via':78 'wall':41 'wallet':176 'wide':158 'without':205 'x402':2,16,39,80,136 'x402 invoice endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"1f22c44f-c458-4a4a-afef-16f022849b2e","listingId":"32038c43-6782-4249-b361-abbe7fa55a63","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/35","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:55:59.516Z"}],"sources":[{"listingId":"32038c43-6782-4249-b361-abbe7fa55a63","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/35","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:59.516Z","lastSeenAt":"2026-04-25T08:33:11.685Z"}],"details":{"listingId":"32038c43-6782-4249-b361-abbe7fa55a63","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/35 \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\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 USDC base units on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/35"},{"claim":"The site advertises $0.02 per request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/35"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatically accessing Stripe invoice data via a crypto-paid endpoint","Agent-driven invoice retrieval without traditional API key authentication","Integrating pay-per-call invoice lookups into Web3 workflows"],"bestFor":["Developers wanting keyless, pay-per-request access to invoice data","AI agents that can settle x402 payments on Base in USDC","Users who prefer crypto micropayments over subscription billing"],"notFor":["Anyone needing detailed API documentation or response schemas before integrating","High-volume invoice processing where $0.02/request adds up significantly","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:50.978Z"},"updatedAt":"2026-04-25T08:33:11.685Z"}}