estimate-fee-per-gas
Calculate gas fees (in wei, gwei, or ether) for blockchain transactions to ensure timely inclusion in the next block. Adjust chain-specific fees using MetaMask MCP for secure and efficient transaction processing.
Instructions
Estimate for the fees per gas (in wei) for a transaction to be likely included in the next block.
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| chainId | No | ID of chain to use when fetching data. | |
| formatUnits | No | Units to use when formatting result. | gwei |
Implementation Reference
- src/tools/estimate-fee-per-gas.ts:15-25 (handler)The execute handler function for the 'estimate-fee-per-gas' tool. It calls wagmi's estimateFeesPerGas with the provided wagmiConfig and args, then returns a structured text response with the JSON-stringified result.execute: async (args) => { const result = await estimateFeesPerGas(wagmiConfig, args); return { content: [ { type: "text", text: JSONStringify(result), }, ], }; },
- Zod schema defining the input parameters for the tool: optional chainId (number) and optional formatUnits (enum: ether/gwei/wei, default gwei).parameters: z.object({ chainId: z.coerce.number().optional().describe("ID of chain to use when fetching data."), formatUnits: z.enum(["ether", "gwei", "wei"]).default("gwei").optional().describe("Units to use when formatting result."), }),
- src/tools/estimate-fee-per-gas.ts:8-26 (registration)The server.addTool call within the registerEstimateFeePerGasTools function, which registers the 'estimate-fee-per-gas' tool including its name, description, input schema, and handler.server.addTool({ name: "estimate-fee-per-gas", description: "Estimate for the fees per gas (in wei) for a transaction to be likely included in the next block.", parameters: z.object({ chainId: z.coerce.number().optional().describe("ID of chain to use when fetching data."), formatUnits: z.enum(["ether", "gwei", "wei"]).default("gwei").optional().describe("Units to use when formatting result."), }), execute: async (args) => { const result = await estimateFeesPerGas(wagmiConfig, args); return { content: [ { type: "text", text: JSONStringify(result), }, ], }; }, });
- src/tools/register-tools.ts:38-38 (registration)Invocation of the registerEstimateFeePerGasTools function within the main registerTools function, effectively registering the tool on the MCP server.registerEstimateFeePerGasTools(server, wagmiConfig);