Fetch a verified contract's ABI from Sourcify by address. Returns the full ABI array and match type ('full' or 'partial'). Returns match_type 'none' for unverified contracts. Defaults to Ethereum mainnet (chain_id 1).
Part of the Boar blockchain MCP (basic) server.
Free to start. No card required.
AI agents call eth_get_abi to retrieve information from Boar blockchain MCP (basic) 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 eth_get_abi 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": {
"eth_get_abi": {}
}
}See the full Boar blockchain MCP (basic) policy for all 37 tools.
These attack patterns abuse exactly the kind of access eth_get_abi 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.
Fetch a verified contract's ABI from Sourcify by address. Returns the full ABI array and match type ('full' or 'partial'). Returns match_type 'none' for unverified contracts. Defaults to Ethereum mainnet (chain_id 1).. It is categorised as a Read tool in the Boar blockchain MCP (basic) MCP Server, which means it retrieves data without modifying state.
Register the Boar blockchain MCP (basic) MCP server in PolicyLayer and add a rule for eth_get_abi: 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_get_abi 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 eth_get_abi 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_get_abi. 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_get_abi 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.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.