Resolve an ENS name to its Ethereum address. Returns null if the name is not registered or has no address record. Example: 'vitalik.eth' → '0xd8dA6BF26964aF9D68eC99A6d99030B4ec93B700'.
Part of the Boar blockchain MCP (basic) server.
Free to start. No card required.
AI agents use eth_resolve_ens to create or modify resources in Boar blockchain MCP (basic). 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 eth_resolve_ens 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 Boar blockchain MCP (basic).
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"eth_resolve_ens": {
"limits": [
{
"counter": "eth_resolve_ens_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Boar blockchain MCP (basic) policy for all 37 tools.
These attack patterns abuse exactly the kind of access eth_resolve_ens 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.
Resolve an ENS name to its Ethereum address. Returns null if the name is not registered or has no address record. Example: 'vitalik.eth' → '0xd8dA6BF26964aF9D68eC99A6d99030B4ec93B700'.. It is categorised as a Write tool in the Boar blockchain MCP (basic) MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Boar blockchain MCP (basic) MCP server in PolicyLayer and add a rule for eth_resolve_ens: 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 Boar blockchain MCP (basic). Nothing to install.
eth_resolve_ens 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 eth_resolve_ens 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 eth_resolve_ens. 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.
eth_resolve_ens is provided by the Boar blockchain MCP (basic) MCP server (boar-network/blockchain-basic). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 37 Boar blockchain MCP (basic) tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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