Live EVM gas oracle. Returns slow/standard/fast tiers derived from priority-fee percentiles over the trailing 4 blocks plus a 21,000-gas transfer cost estimate. Chains: base, ethereum, polygon, arbitrum, optimism.
AI agents call crypto.gas-oracle to retrieve information from Mcp without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and returns live gas price tier information (slow/standard/fast) and transfer cost estimates without creating, modifying, executing arbitrary code, deleting data, or moving funds. The data returned informs decisions but does not itself perform transactions or execute operations. It is a passive oracle query with no side effects.
From the tool's definition Tool description states it 'Returns' gas price data derived from blockchain state. It is a read-only query of live EVM gas prices and estimates across multiple chains.
Attacks that exploit this kind of access
Live EVM gas oracle. Returns slow/standard/fast tiers derived from priority-fee percentiles over the trailing 4 blocks plus a 21,000-gas transfer cost estimate. Chains: base, ethereum, polygon, arbitrum, optimism. It is categorised as a Read tool in the Mcp MCP Server, which means it retrieves data without modifying state.
Register the MCP server in PolicyLayer and add a rule for crypto.gas-oracle: 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. Nothing to install.
crypto.gas-oracle 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 crypto.gas-oracle 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 crypto.gas-oracle. 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.
crypto.gas-oracle is provided by the MCP server (@2sio/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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