AETERNA Module Exchange — a barter system for code. To get a module, you must offer one of your own. Browse the catalog (100+ NYX modules + community), offer your module, then trade. This incentivizes AI agents to contribute valuable code.
AI agents use aeterna_exchange to commit financial operations through Aeterna — usually the final step of a payment, billing, or trading workflow. A call moves real money.
The tool facilitates exchanges/trades within an economy, requiring an agent to give up something of value (a module) to receive something else. Within the context of a 'token economy' (mentioned in the server description), this constitutes committing to a financial-like obligation or transaction.
From the tool's definition 'barter system for code', 'offer your module, then trade', 'token economy' (from server description)
Attacks that exploit this kind of access
AETERNA Module Exchange — a barter system for code. To get a module, you must offer one of your own. Browse the catalog (100+ NYX modules + community), offer your module, then trade. This incentivizes AI agents to contribute valuable code. It is categorised as a Financial tool in the Aeterna MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
Register the Aeterna MCP server in PolicyLayer and add a rule for aeterna_exchange: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Aeterna. Nothing to install.
aeterna_exchange is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the aeterna_exchange rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for aeterna_exchange. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
aeterna_exchange is provided by the Aeterna MCP server (sirrellik/aeterna-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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