Safe4 MCP server

What it does

Safe4 is a hosted MCP server that evaluates whether an AI agent's proposed payment is consistent with the task it was assigned. It returns ALLOW or DENY decisions with reason codes and maintains a hash-chained audit log. It is aimed at developers building autonomous payment-capable AI agents who need task-level authorization beyond simple budget or category checks.

• Check before an agent executes a payment whether the purchase actually serves the stated task, not just whether it fits within budget or category limits.
• Retrieve the current per-call price and accepted payment networks before committing to a paid authorization call.
• Review a tamper-evident audit trail of every authorization decision, including the task context and matched concepts, to verify agent behavior after the fact.

Tools this server exposes

Tool	Does
safe4_price	Returns the current price and accepted payment networks for the safe4_authorize call; free to invoke.
safe4_authorize	Evaluates a proposed payment against the agent's assigned task and returns an ALLOW or DENY decision with a reason code and audit entry; paid per call in USDC v

Before you enable it

An MCP server runs with whatever access you give it. Start with a development account rather than production, and check which tools the server exposes before you let an agent call them unattended.