PowForge MCP is middleware designed for MCP server operators who need to control access to costly tools by combining payment gating and reputation checks. It addresses the challenge of preventing abuse by unknown or untrusted agents, ensuring that only callers who have both paid a Lightning invoice and meet a minimum reputation threshold can access protected endpoints. The middleware integrates a Lightning Network L402 payment flow with a Schnorr-signed depth-of-identity (DoI) score, allowing operators to reject callers below a configurable reputation threshold and to charge per tool call.
The platform provides an Express middleware package, installable via npm, that can be dropped in front of any MCP tool route. When a caller accesses a gated route, the middleware issues a 402 response with a Lightning invoice. Upon payment, the caller replays the request with the required authorization fields and their public key. The middleware then queries an external oracle for the caller’s DoI score, which is cached for five minutes per public key. Only callers whose score meets or exceeds the specified threshold are allowed to proceed; others receive a 403 response. The system uses one-time-use macaroons for authentication, which expire after a configurable period.
For non-Express environments, PowForge MCP offers a tool factory that returns a plain MCP tool definition with the gate logic embedded. This allows integration with any MCP server, including those using the official MCP SDK or custom HTTP transports. The middleware is suitable for operators managing tools with significant operational costs, such as image rendering, web scraping, or code execution, and for public MCP tool authors who want to deter abuse from throwaway identities while allowing genuine users to pay once and continue using the service.
Reputation thresholds are configurable, with suggested minimum scores corresponding to different levels of trust and operational risk. The middleware can be set to fail closed if the reputation oracle is unreachable or to allow fallback behavior. Installation is via two npm packages, and a working server example is available for cloning. The approach is intended to provide both payment enforcement and sybil resistance for open or high-cost MCP tools.
PowForge MCP sits in PulseGate's Infrastructure & Backend category. It focuses on enabling MCP server operators to monetize and secure tool calls with payment and reputation gating. PowForge MCP is an open-source project aimed at mcp server operators and developers. The project is open source (MIT). It runs on the command line.
PowForge builds and maintains PowForge MCP, and the product first shipped in 2026. The project is developed in the open on GitHub with 1 commits in the last 90 days. Across PulseGate's embedding index, PowForge MCP has few near neighbours, marking it as relatively distinct. Among its 5 catalogued features are MCP middleware, lightning payments, and reputation scoring. It exposes integrations via an MCP server.
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