{"id":"d50b5298-5172-42f7-8462-c3f5726edfdb","shortId":"6ADPeU","kind":"x402","title":"x402-gated Stripe invoice endpoint on Base, paying $0.02 in USDC per request.","tagline":"x402-gated Stripe invoice endpoint on Base, paying $0.02 in USDC per request.","description":"This endpoint at lowpaymentfee.com provides premium API access to a Stripe invoice resource (invoice ID 108) via the x402 payment protocol. It is part of a broader platform that offers a variety of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated behind x402 challenges settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/stripe/invoices/108` accepts POST requests and returns `application/json`. The x402 challenge advertises a maximum amount of 20,000 base units of USDC (contract `0x8335…2913` on Base), which equals $0.02 per call (USDC uses 6 decimals). Payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a timeout of 300 seconds. No API keys or rate limits are required — access is granted purely through the x402 payment header.\n\nDocumentation on the site 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 schema beyond the x402 challenge's `outputSchema`, and no explanation of what data the invoice endpoint actually returns. The platform's landing page lists many other endpoints across categories (analytics, AI, finance, utilities) all at the same $0.02 price point, but details on input parameters and response formats are absent.","tags":[],"capabilities":["x402-payment","usdc-base","stripe-invoice","pay-per-request","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["stripe invoice API","x402 paid API","USDC micropayment API","Base network API","pay-per-call invoice","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available — request parameters and response format are unknown","All documentation pages (docs, API, pricing, README) return only a 'Connect wallet' prompt with no content","The specific purpose of /api/v1/stripe/invoices/108 is not explained; 'Premium API Access' is generic","This endpoint path references a specific Stripe invoice ID (108), which may be a demo or placeholder"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/invoices/108","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/108","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 OpenAPI spec, no documentation of request parameters or response schema, and the docs/pricing/README pages are all empty. The purpose of this specific invoice endpoint is unclear beyond the generic 'Premium API Access' 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'0.02':10,24,120,225 '000':108 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':132 '0x8335':114 '108':44 '20':107 '2913':115 '300':137 '6':125 'Base network API' 'USDC micropayment API' 'absent':237 'accept':93 'access':36,147 'across':215 'actual':204 'address':131 'advertis':102 'ai':218 'ai/ml':70 'amount':105 'analyt':69,217 'api':35,66,140,165 'application/json':98 'base':8,22,87,109,117 'behind':79 'beyond':189 'broader':55 'call':65,122 'categori':216 'challeng':81,101,192 'connect':174 'content':180 'contract':113 'data':68,73,200 'decim':126 'detail':229 'doc':164 'document':156 'endpoint':6,20,30,91,203,214 'equal':119 'explan':197 'extrem':161 'financ':219 'finance/web3':72 'format':235 'gate':3,17,78 'grant':149 'header':155 'id':43 'infer':71 'infrastructur':75 'input':231 'invoic':5,19,40,42,202 'json-response' 'key':141 'land':209 'limit':144 'list':211 'lowpaymentfee' 'lowpaymentfee.com':32 'mani':212 'maximum':104 'network':88 'no-api-key' 'offer':58 'openapi':184 'outputschema':194 'page':169,210 'paramet':232 'part':52 'pay':9,23,63 'pay-per-cal':62 'pay-per-call invoice' 'pay-per-request' 'payment':48,127,154 'per':13,27,64,121 'platform':56,207 'point':227 'post':94 'premium':34 'price':166,226 'prompt':176 'protocol':49 'provid':33 'pure':150 'rate':143 'readm':168 'render':171 'request':14,28,95 'request/response':187 'requir':146 'resourc':41 'respons':234 'return':97,205 'schema':188 'second':138 'sent':129 'settl':82 'site':159 'span':67 'spars':162 'spec':185 'specif':90 'stripe':4,18,39 'stripe invoice API' 'stripe-invoice' 'timeout':135 'unit':110 'usdc':12,26,84,112,123 'usdc-base' 'use':124 'util':76,220 'varieti':60 'via':45 'wallet':175 'x402':2,16,47,80,100,153,191 'x402 paid API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"6960cfc0-32f5-4f50-b655-0ab083709245","listingId":"d50b5298-5172-42f7-8462-c3f5726edfdb","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/108","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:55:22.271Z"}],"sources":[{"listingId":"d50b5298-5172-42f7-8462-c3f5726edfdb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/invoices/108","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:55:22.271Z","lastSeenAt":"2026-04-25T17:03:34.927Z"}],"details":{"listingId":"d50b5298-5172-42f7-8462-c3f5726edfdb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/108 \\\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 x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/108"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/invoices/108"},{"claim":"Platform advertises $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving Stripe invoice data (invoice 108) via a single paid API call","Demonstrating x402 payment protocol integration for agent-to-agent commerce","Accessing premium data endpoints without traditional API key management"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents that can settle USDC payments on Base for per-call access","Projects needing keyless, pay-as-you-go API access"],"notFor":["Users who need detailed API documentation or request/response schemas before integrating","High-volume consumers who want subscription-based pricing rather than per-call charges","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:52.726Z"},"updatedAt":"2026-04-25T17:03:34.927Z"}}