{"id":"14045f8c-e113-4f9b-85a2-29ce2aeb58ef","shortId":"JkAjBC","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 access to a Stripe invoice resource (invoice ID 190) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 \"exact\" scheme. The maximum amount required per call is 20,000 base units of USDC, which equals $0.02 (USDC uses 6 decimals).\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-request APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto market data, and utility services—all priced at $0.02 per request with no API keys, no rate limits, and no commitments. However, this specific listing is for the Stripe invoices endpoint at path `/api/v1/stripe/invoices/190`, which is not listed among the publicly advertised API categories on the homepage. Its exact response payload and purpose are unclear from available documentation.\n\nDocumentation is extremely sparse: the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response examples, and no detailed description of what the Stripe invoices endpoint returns. The endpoint is confirmed live (returns a valid x402 402 challenge), but the actual functionality behind the paywall cannot be verified from the crawl material alone.","tags":[],"capabilities":["x402-payment","usdc-on-base","stripe-invoice-access","pay-per-request","json-response"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 paid endpoint","USDC micropayment API","Base network API","pay-per-call invoice","lowpaymentfee"],"warnings":["No OpenAPI spec or schema available for this endpoint","Documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","This specific endpoint (/api/v1/stripe/invoices/190) is not listed among the provider's publicly advertised APIs","Actual response payload and functionality behind the paywall are unknown","The endpoint path references a specific invoice ID (190), which may indicate a demo or test resource"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/190","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/190","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, but there is no OpenAPI spec, no request/response examples, and no documentation beyond a wallet-connect prompt. The specific Stripe invoices endpoint is not listed on the homepage's advertised APIs, making its purpose unclear. Effectively a stub 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'/api/v1/stripe/invoices/190':149 '/docs':179 '/pricing':181 '/readme':183 '0.02':87,124 '000':80 '0x8335':65 '190':42 '20':79 '2913':66 '402':224 '6':90 'Base network API' 'USDC micropayment API' 'accept':49 'access':34 'actual':228 'advertis':96,157 'ai/ml':108 'alon':240 'among':154 'amount':74 'analysi':111 'analyt':107 'api':104,129,158 'avail':172 'base':8,22,60,81 'behind':43,230 'broader':93 'call':12,26,77 'cannot':233 'categori':159 'challeng':225 'classif':113 'commit':136 'confirm':218 'connect':189 'content':195 'contract':64 'crawl':238 'data':106,117 'decim':91 'descript':207 'detail':206 'document':173,174 'embed':114 'endpoint':6,20,30,48,146,213,216 'equal':86 'exact':70,164 'exampl':203 'extrem':176 'finance/crypto':115 'function':229 'gate':3,17 'homepag':162 'howev':137 'id':41 'infer':109 'invoic':5,19,38,40,145,212 'json':54 'json-response' 'key':130 'limit':133 'list':140,153 'live':219 'lowpaymentfee' 'lowpaymentfee.com':32,94 'market':116 'materi':239 'maximum':73 'network':61 'openapi':199 'page':184 'paid':9,23 'path':148 'pay':101 'pay-per-call invoice' 'pay-per-request':100 'payload':166 'payment':55 'paywal':46,232 'per':11,25,76,102,125 'per-cal':10,24 'platform':95 'post':50 'price':122 'prompt':191 'provid':33 'public':156 'purpos':168 'rate':132 'render':186 'request':51,103,126 'request/response':202 'requir':75 'resourc':39 'respons':165 'return':53,214,220 'scheme':71 'sentiment':110 'servic':120 'settl':57 'span':105 'spars':177 'spec':200 'specif':139 'stripe':4,18,37,144,211 'stripe invoice API' 'stripe-invoice-access' 'suit':98 'summar':112 'unclear':170 'unit':82 'usdc':14,28,63,84,88 'usdc-on-base' 'use':62,89 'util':119 'valid':222 'verifi':235 'via':67 'wallet':190 'x402':2,16,45,69,223 'x402 paid endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"f97a9b49-6c23-4a09-ae98-2239754bd87c","listingId":"14045f8c-e113-4f9b-85a2-29ce2aeb58ef","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/190","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:55:49.880Z"}],"sources":[{"listingId":"14045f8c-e113-4f9b-85a2-29ce2aeb58ef","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/190","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:49.880Z","lastSeenAt":"2026-04-25T10:03:27.385Z"}],"details":{"listingId":"14045f8c-e113-4f9b-85a2-29ce2aeb58ef","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/190 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/190"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/190"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Advertised API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving Stripe invoice data programmatically via a pay-per-call model","Agents that need to fetch invoice details without managing API keys","Demonstrating x402 payment protocol integration with USDC on Base"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-request access to invoice data","Projects already operating on the Base L2 network with USDC"],"notFor":["Users needing well-documented, production-grade Stripe integrations","Bulk invoice retrieval where per-call pricing is inefficient","Anyone requiring detailed API documentation before committing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:51.455Z"},"updatedAt":"2026-04-25T10:03:27.385Z"}}