Get dynamic pricing for x402 proxy requests. FREE - returns total cost (proxy fee + target cost).
Part of the Xportalx server.
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AI agents call x402_proxy_price to retrieve information from Xportalx 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 x402_proxy_price 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": {
"x402_proxy_price": {}
}
}See the full Xportalx policy for all 29 tools.
These attack patterns abuse exactly the kind of access x402_proxy_price 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 dynamic pricing for x402 proxy requests. FREE - returns total cost (proxy fee + target cost).. It is categorised as a Read tool in the Xportalx MCP Server, which means it retrieves data without modifying state.
Register the Xportalx MCP server in PolicyLayer and add a rule for x402_proxy_price: 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 Xportalx. Nothing to install.
x402_proxy_price 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 x402_proxy_price 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 x402_proxy_price. 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.
x402_proxy_price is provided by the Xportalx MCP server (https://fflpdljiuruqdnewvwkk.supabase.co/functions/v1/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 29 Xportalx tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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