Get a signed x402 payment quote for NOMOS services. Tier 1: $0.02 simple verdict | Tier 2: $0.05 verdict + evidence | Tier 3: $0.10 full packet. Returns quote with payTo address, network (Base mainnet), amount in USDC atomic units.
Part of the NOMOS Cross-Border Broker server.
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AI agents call nomos_x402_quote to retrieve information from NOMOS Cross-Border Broker without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though nomos_x402_quote only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"nomos_x402_quote": {}
}
}See the full NOMOS Cross-Border Broker policy for all 5 tools.
These attack patterns abuse exactly the kind of access nomos_x402_quote gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Get a signed x402 payment quote for NOMOS services. Tier 1: $0.02 simple verdict | Tier 2: $0.05 verdict + evidence | Tier 3: $0.10 full packet. Returns quote with payTo address, network (Base mainnet), amount in USDC atomic units.. It is categorised as a Read tool in the NOMOS Cross-Border Broker MCP Server, which means it retrieves data without modifying state.
Register the NOMOS Cross-Border Broker MCP server in PolicyLayer and add a rule for nomos_x402_quote: 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 NOMOS Cross-Border Broker. Nothing to install.
nomos_x402_quote is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the nomos_x402_quote 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 nomos_x402_quote. 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.
nomos_x402_quote is provided by the NOMOS Cross-Border Broker MCP server (https://tooloracle.io/mcp/nomos). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 5 NOMOS Cross-Border Broker tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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