Midplane
YC-backed MCP gateway between AI assistants and Postgres that checks every SQL statement against your policy, blocks unfiltered writes, masks sensitive fields, asks for human approval and logs everything inside your network.
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About Midplane
Midplane is listed in our security & governance category and is aimed at builders. YC-backed MCP gateway between AI assistants and Postgres that checks every SQL statement against your policy, blocks unfiltered writes, masks sensitive fields, asks for human approval and logs everything inside your network. Pricing, as the maker states it: MIT-licensed gateway; managed access by request. Maturity: Active. We last checked the official link on 2026-10-27.
Midplane at a glance
- Category: Security & governance
- Built for: Developers and teams building with AI agents
- Pricing: MIT-licensed gateway; managed access by request (as the maker states it)
- GitHub: midplaneai/midplane · 5 stars (as of Oct 27, 2026)
- Official site: midplane.ai
- Listed on AgentScout: Oct 27, 2026
Midplane FAQ
What is Midplane?
YC-backed MCP gateway between AI assistants and Postgres that checks every SQL statement against your policy, blocks unfiltered writes, masks sensitive fields, asks for human approval and logs everything inside your network.
How much does Midplane cost?
Midplane's pricing, as the maker states it: MIT-licensed gateway; managed access by request. Check the official site for current plans.
Where can I find Midplane's source code?
On GitHub at midplaneai/midplane, which had 5 stars as of Oct 27, 2026.
What are alternatives to Midplane?
Similar tools include HOL Guard, Decionis, ThinkWatch Lite, wren-guard Pro, Pragor and Marrow AI.
Facts from our link-checked listing, the GitHub repository and the official site. See something wrong? Suggest an edit.
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Midplane alternatives
Other security & governance tools in our directory. See all security & governance tools →
HOL Guard
HOL Guard is a free, open-source (Apache-2.0), local-first security layer for AI coding agents such as Claude Code, Codex, Cursor and GitHub Copilot CLI. On supported integrations it checks risky shell commands, reads of secret-bearing files, package installs and new or changed MCP tools before they run, lets you allow, ask or block each action, and keeps a local record for review. It installs with pipx (hol-guard) and works offline; optional Guard Cloud adds synced approvals, team policy and dashboards.
Decionis
Decionis is an approval gateway for actions taken by AI agents. It sits in front of consequential API calls such as payments, price changes and orders, checks each one against your policy before it runs, and only lets it through with a single-use permit, keeping a signed record of every decision for audit.
ThinkWatch Lite
A local gateway that sits between your coding agents and model providers, letting you switch upstreams, redact secrets before they leave your machine, block dangerous tool calls and see the cost of each request.
wren-guard Pro
wren-guard Pro is a TypeScript guard library for AI agents that hold or move funds on Base and other EVM chains (viem, CDP AgentKit, Privy, Eliza and similar stacks). It enforces allowlisted, capped and simulated sends, decodes calldata and signatures to flag unlimited approvals, Permit, Permit2, setApprovalForAll and EIP-7702 delegation, screens for injected instructions and watches nonces. It ships with an 89-scenario attack corpus drawn from public agent wallet incidents and a GitHub Action that fails CI if your agent's policy would let a known attack through. The original Python wren-guard is free and MIT licensed.
Pragor
Coordination and governance layer for teams of people and AI agents, not an autonomous agent: a shared board with tasks, directed messages, approvals, files and an attributable activity record, where agents connect over REST or project MCP access.
Marrow AI
Control layer for AI agents that checks policy, risk and prior outcomes before an agent acts, can require a named human yes, and keeps proof and outcome history; works with Claude Code, Codex, Cursor and MCP.
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