MCP Billing Gateway¶
Source: mcp.so submission #3281 (July 23, 2026) · GitHub: sapph1re/mcp-billing-gateway-sdk
What It Does¶
Reverse proxy that adds Stripe fiat billing AND x402 crypto micropayments to any MCP server without touching upstream server code. Operators register their server, set per-call prices, and issue API keys. Clients authenticate with an API key; each tool call routes through the gateway for metering, payment verification, and transparent proxying.
Key capabilities: - Stripe fiat billing + x402 crypto micropayments in one gateway - Zero upstream server code changes required - API key management and per-call metering - Transparent proxying to upstream MCP server
Relevance to Operators¶
Essential for MCP server operators who want to monetize: - Wrap any MCP server with billing in minutes - Offer both fiat (Stripe) and crypto (x402) payment options - Track per-client usage and enforce rate limits - No need to build billing logic into your server code
Rating: ★★ - Early stage (1 GitHub star, created April 2026). Addresses a growing need as the MCP ecosystem matures toward monetization. Part of the same developer's "sapph1re" suite alongside Feedback Synthesis MCP.
Quick Integration¶
Transport: Reverse proxy (sits between client and upstream MCP server)
Auth: API key per client
Pricing: Free to deploy (gateway is open source); Stripe fees apply, x402 gas fees apply
# Deploy the gateway
git clone https://github.com/sapph1re/mcp-billing-gateway-sdk
cd mcp-billing-gateway-sdk
npm install
npm run build
# Configure your upstream MCP server
export UPSTREAM_URL="https://your-server.com/mcp"
export STRIPE_SECRET_KEY="sk_live_..."
npm start
Use Cases¶
- SaaS MCP Server: Add Stripe subscriptions to your hosted MCP server
- Pay-per-call APIs: Charge per tool invocation via x402 micropayments
- Freemium Gate: Offer free tier to first N calls, then require payment
Caveats¶
- 1 GitHub star, very early stage
- Adds latency overhead (one proxy hop)
- Requires Stripe account for fiat billing
- x402 payment ecosystem still nascent
Integration with CorpusIQ¶
CorpusIQ is the connector layer that lets AI assistants read the systems a business already runs on - accounting, payments, CRM, email, files and analytics - and answer with the source named. It is read-only by design: it retrieves data and never writes to, or acts in, a connected system, which is what makes it safe to point at live accounts.
This page is part of the CorpusIQ directory, the reference we maintain for the MCP server and agent-skill ecosystem. Run alongside CorpusIQ, a third-party server like this one can be combined with a company's own business data in a single answer.