Get fee recommendations and estimate gas costs for EVM blockchains. Use this before preparing or signing a transaction to determine appropriate gas parameters. Actions: • get-fee-recommendations: Get recommended gas price tiers (slow/standard/fast) • get-eip-1559-fee-recommendations: Get EIP-1559...
Part of the Mcp Blockchain Fees server.
Free to start. No card required.
AI agents call blockchain_fees_evm to retrieve information from Mcp Blockchain Fees 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 blockchain_fees_evm 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": {
"blockchain_fees_evm": {}
}
}See the full Mcp Blockchain Fees policy for all 3 tools.
These attack patterns abuse exactly the kind of access blockchain_fees_evm 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 fee recommendations and estimate gas costs for EVM blockchains. Use this before preparing or signing a transaction to determine appropriate gas parameters. Actions: • get-fee-recommendations: Get recommended gas price tiers (slow/standard/fast) • get-eip-1559-fee-recommendations: Get EIP-1559 fee parameters (baseFee, maxPriorityFee) for supported chains • estimate-native-coin-transfer-gas: Estimate gas for a native coin transfer (e.g. ETH, BNB) • estimate-token-transfer-gas: Estimate gas for an ERC-20/ERC-721 token transfer • estimate-contract-interaction-gas: Estimate gas for a smart contract call. It is categorised as a Read tool in the Mcp Blockchain Fees MCP Server, which means it retrieves data without modifying state.
Register the Mcp Blockchain Fees MCP server in PolicyLayer and add a rule for blockchain_fees_evm: 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 Mcp Blockchain Fees. Nothing to install.
blockchain_fees_evm 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 blockchain_fees_evm 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 blockchain_fees_evm. 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.
blockchain_fees_evm is provided by the Mcp Blockchain Fees MCP server (@cryptoapis-io/mcp-blockchain-fees). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 3 Mcp Blockchain Fees tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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