Check if a domain is listed for sale on secondary marketplaces and get estimated market price. Complements 'available' (new registration price) — this tool checks the resale market. Three possible statuses: - 'for_sale': domain has a listed price. This is a third-party marketplace price set by th...
Part of the DomainKits server.
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AI agents use market_price to create or modify resources in DomainKits. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call market_price repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach DomainKits.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"market_price": {
"limits": [
{
"counter": "market_price_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full DomainKits policy for all 38 tools.
These attack patterns abuse exactly the kind of access market_price gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Check if a domain is listed for sale on secondary marketplaces and get estimated market price. Complements 'available' (new registration price) — this tool checks the resale market. Three possible statuses: - 'for_sale': domain has a listed price. This is a third-party marketplace price set by the seller — it is not an appraisal or guaranteed transaction price. Always present buy_url. - 'make_offer': listed for sale but no fixed price, buyer must submit an offer via buy_url. - 'not_found': not publicly listed. Does NOT mean the domain is unavailable for purchase — owner may sell privately or hasn't listed yet. Suggest whois to find registrar info for direct outreach. Best practices: - Marketplace listing prices are set by sellers and often significantly higher than actual transaction prices. Do not treat estimated_price as definitive market value — it is one data point among many. - When used in valuation_cma workflow, batch-call market_price for multiple comparable domains. 'not_found' results should be excluded, 'make_offer' results noted as supplementary only. - Always disclose affiliate links when buy_url has affiliate=true. - Always include disclaimer: prices are provided by third-party marketplaces for reference only, subject to change by the seller at any time.. It is categorised as a Write tool in the DomainKits MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the DomainKits MCP server in PolicyLayer and add a rule for market_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 DomainKits. Nothing to install.
market_price is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the market_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 market_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.
market_price is provided by the DomainKits MCP server (https://api.domainkits.com/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 38 DomainKits tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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