Manifold Markets MCP Server

Instructions

Implementation Reference

• src/index.ts:650-682 (handler)

  Executes the cancel_bet tool: validates input with CancelBetSchema, authenticates with MANIFOLD_API_KEY, sends POST request to Manifold Markets API to cancel the specified bet, returns success message.

  case 'cancel_bet': {
    const { betId } = CancelBetSchema.parse(args);
    const apiKey = process.env.MANIFOLD_API_KEY;
    if (!apiKey) {
      throw new McpError(
        ErrorCode.InternalError,
        'MANIFOLD_API_KEY environment variable is required'
      );
    }
  
    const response = await fetch(`${API_BASE}/v0/bet/cancel/${betId}`, {
      method: 'POST',
      headers: {
        Authorization: `Key ${apiKey}`,
      },
    });
  
    if (!response.ok) {
      throw new McpError(
        ErrorCode.InternalError,
        `Manifold API error: ${response.statusText}`
      );
    }
  
    return {
      content: [
        {
          type: 'text',
          text: 'Bet cancelled successfully',
        },
      ],
    };
  }

• src/index.ts:88-90 (schema)

  Zod schema defining the input for cancel_bet tool: requires a 'betId' string.

  const CancelBetSchema = z.object({
    betId: z.string(),
  });

• src/index.ts:266-276 (registration)

  Registers the 'cancel_bet' tool in the MCP server's tool list, providing name, description, and input schema for listing available tools.

  {
    name: 'cancel_bet',
    description: 'Cancel a limit order bet',
    inputSchema: {
      type: 'object',
      properties: {
        betId: { type: 'string', description: 'Bet ID to cancel' },
      },
      required: ['betId'],
    },
  },