diff --git a/mmgen_node_tools/BlocksInfo.py b/mmgen_node_tools/BlocksInfo.py
index 70d9821..25e1caf 100755
--- a/mmgen_node_tools/BlocksInfo.py
+++ b/mmgen_node_tools/BlocksInfo.py
@@ -24,7 +24,7 @@ import re,json
 from collections import namedtuple
 from time import strftime,gmtime
 
-from mmgen.common import *
+from mmgen.util import msg,Msg,Msg_r,die,suf,secs_to_ms,secs_to_dhms,is_int
 from mmgen.rpc import json_encoder
 
 class BlocksInfo:
@@ -362,7 +362,8 @@ class BlocksInfo:
 		first = self.conv_blkspec(first)
 		last  = self.conv_blkspec(last or first)
 
-		if p.debug: msg(repr(self.range_data(first,last,from_tip,nblocks,step)))
+		if p.debug:
+			msg(repr(self.range_data(first,last,from_tip,nblocks,step)))
 
 		if first > last:
 			die(1,f'{first}-{last}: invalid block range')
diff --git a/mmgen_node_tools/data/version b/mmgen_node_tools/data/version
index 6496c42..623245b 100644
--- a/mmgen_node_tools/data/version
+++ b/mmgen_node_tools/data/version
@@ -1 +1 @@
-3.1.dev16
+3.1.dev17
diff --git a/mmgen_node_tools/main_addrbal.py b/mmgen_node_tools/main_addrbal.py
index 9f2e11e..177bac4 100755
--- a/mmgen_node_tools/main_addrbal.py
+++ b/mmgen_node_tools/main_addrbal.py
@@ -12,7 +12,10 @@
 mmnode-addrbal: Get balances for arbitrary addresses in the blockchain
 """
 
-from mmgen.common import *
+from mmgen.obj import CoinTxID,Int
+from mmgen.cfg import Config
+from mmgen.util import msg,Msg,die,suf,make_timestr,async_run
+from mmgen.color import red
 
 opts_data = {
 	'text': {
@@ -115,7 +118,7 @@ async def main(req_addrs):
 	addrs = [CoinAddr(proto,addr) for addr in req_addrs]
 
 	from mmgen.rpc import rpc_init
-	rpc = await rpc_init( cfg, proto )
+	rpc = await rpc_init(cfg)
 
 	height = await rpc.call('getblockcount')
 	Msg(f'{proto.coin} {proto.network.upper()} [height {height}]')
@@ -156,13 +159,11 @@ async def main(req_addrs):
 
 		(do_output_tabular if cfg.tabular else do_output)( proto, addr_data, dict(zip(blk_heights,blk_hdrs)) )
 
-cfg = opts.init(opts_data,init_opts={'rpc_backend':'aiohttp'})
+cfg = Config( opts_data=opts_data, init_opts={'rpc_backend':'aiohttp'} )
 
 if len(cfg._args) < 1:
 	die(1,'This command requires at least one coin address argument')
 
-from mmgen.obj import CoinTxID,Int
-
 try:
 	async_run(main(cfg._args))
 except KeyboardInterrupt:
diff --git a/mmgen_node_tools/main_blocks_info.py b/mmgen_node_tools/main_blocks_info.py
index 38914c5..1fe5e82 100755
--- a/mmgen_node_tools/main_blocks_info.py
+++ b/mmgen_node_tools/main_blocks_info.py
@@ -20,8 +20,7 @@
 mmnode-blocks-info: Display information about a block or range of blocks
 """
 
-import mmgen.opts as opts
-from mmgen.globalvars import gc
+from mmgen.cfg import gc,Config
 from mmgen.util import async_run,fmt_list
 from .BlocksInfo import BlocksInfo,JSONBlocksInfo
 
@@ -157,7 +156,7 @@ This program requires a txindex-enabled daemon for correct operation.
 	}
 }
 
-cfg = opts.init(opts_data)
+cfg = Config(opts_data=opts_data)
 
 async def main():
 
@@ -165,7 +164,7 @@ async def main():
 
 	cls = JSONBlocksInfo if cfg.json else BlocksInfo
 
-	m = cls( cfg, cfg._args, await rpc_init(cfg,cfg._proto) )
+	m = cls( cfg, cfg._args, await rpc_init(cfg) )
 
 	if m.fnames and not cfg.no_header:
 		m.print_header()
diff --git a/mmgen_node_tools/main_feeview.py b/mmgen_node_tools/main_feeview.py
index f5212e3..527dc85 100755
--- a/mmgen_node_tools/main_feeview.py
+++ b/mmgen_node_tools/main_feeview.py
@@ -20,7 +20,8 @@
 mmnode-feeview: Visualize the fee structure of a node’s mempool
 """
 
-from mmgen.common import *
+from mmgen.cfg import Config
+from mmgen.util import async_run,die,fmt,make_timestr,check_int_between
 from mmgen.util2 import int2bytespec,parse_bytespec
 
 min_prec,max_prec,dfl_prec = (0,6,4)
@@ -39,7 +40,7 @@ fee_brackets = [
 	100000, 1000000, 10000000, 100000000, 1000000000, 10000000000, 2100000000000000,
 ]
 
-cfg = opts.init({
+opts_data = {
 	'sets': [
 		('detail',True,'ranges',True),
 		('detail',True,'show_mb_col',True),
@@ -75,8 +76,10 @@ Note that there is no global mempool in Bitcoin, and your node’s mempool may
 differ significantly from those of mining nodes depending on uptime and other
 factors.
 """
+	}
 }
-})
+
+cfg = Config(opts_data=opts_data)
 
 if cfg.ignore_below:
 	if cfg.show_empty:
@@ -202,7 +205,7 @@ async def main():
 	proto = cfg._proto
 
 	from mmgen.rpc import rpc_init
-	c = await rpc_init( cfg, proto )
+	c = await rpc_init(cfg)
 
 	mempool = await c.call('getrawmempool',True)
 
diff --git a/mmgen_node_tools/main_halving_calculator.py b/mmgen_node_tools/main_halving_calculator.py
index e92d161..1e35b2a 100755
--- a/mmgen_node_tools/main_halving_calculator.py
+++ b/mmgen_node_tools/main_halving_calculator.py
@@ -22,11 +22,13 @@ mmnode-halving-calculator: Estimate date(s) of future block subsidy halving(s)
 
 import time
 from decimal import Decimal
-from mmgen.common import *
+
+from mmgen.cfg import Config
+from mmgen.util import async_run
 
 bdr_proj = 9.95
 
-cfg = opts.init({
+opts_data = {
 	'sets': [('mined',True,'list',True)],
 	'text': {
 		'desc': 'Estimate date(s) of future block subsidy halving(s)',
@@ -41,7 +43,9 @@ cfg = opts.init({
 -s, --sample-size=N Block range to calculate block discovery interval for next
                     halving estimate (default: dynamically calculated)
 """ }
-})
+}
+
+cfg = Config(opts_data=opts_data)
 
 if cfg.bdr_proj:
 	bdr_proj = float(cfg.bdr_proj)
diff --git a/mmgen_node_tools/main_netrate.py b/mmgen_node_tools/main_netrate.py
index 78c9823..da0b4dc 100755
--- a/mmgen_node_tools/main_netrate.py
+++ b/mmgen_node_tools/main_netrate.py
@@ -20,8 +20,10 @@
 mmnode-netrate: Bitcoin daemon network rate monitor
 """
 
-import time
-from mmgen.common import *
+import sys,time
+
+from mmgen.cfg import Config
+from mmgen.util import async_run
 
 opts_data = {
 	'text': {
@@ -34,14 +36,14 @@ opts_data = {
 	}
 }
 
-cfg = opts.init(opts_data)
+cfg = Config(opts_data=opts_data)
 
 ERASE_LINE,CUR_UP = '\033[K','\033[1A'
 
 async def main():
 
 	from mmgen.rpc import rpc_init
-	c = await rpc_init( cfg, cfg._proto )
+	c = await rpc_init(cfg)
 
 	async def get_data():
 		d = await c.call('getnettotals')
diff --git a/mmgen_node_tools/main_peerblocks.py b/mmgen_node_tools/main_peerblocks.py
index af723c9..56b412c 100755
--- a/mmgen_node_tools/main_peerblocks.py
+++ b/mmgen_node_tools/main_peerblocks.py
@@ -20,9 +20,6 @@
 mmnode-peerblocks: List blocks in flight, disconnect stalling nodes
 """
 
-import mmgen.opts as opts
-from mmgen.util import async_run
-
 opts_data = {
 	'text': {
 		'desc': 'List blocks in flight, disconnect stalling nodes',
@@ -36,10 +33,11 @@ opts_data = {
 
 async def main():
 
-	cfg = opts.init(opts_data)
+	from mmgen.cfg import Config
+	cfg = Config(opts_data=opts_data)
 
 	from mmgen.rpc import rpc_init
-	rpc = await rpc_init( cfg, cfg._proto )
+	rpc = await rpc_init(cfg)
 
 	from .PeerBlocks import BlocksDisplay,PeersDisplay
 	blocks = BlocksDisplay(cfg)
@@ -49,4 +47,5 @@ async def main():
 		await blocks.run(rpc)
 		await peers.run(rpc)
 
+from mmgen.util import async_run
 async_run(main())
diff --git a/mmgen_node_tools/main_ticker.py b/mmgen_node_tools/main_ticker.py
index da96bb8..83d0b1c 100755
--- a/mmgen_node_tools/main_ticker.py
+++ b/mmgen_node_tools/main_ticker.py
@@ -13,7 +13,6 @@ mmnode-ticker: Display price information for cryptocurrency and other assets
 """
 
 import sys,os
-from mmgen.common import *
 from .Ticker import *
 
 opts_data = {
@@ -197,7 +196,8 @@ To add a portfolio, edit the file
 	}
 }
 
-gcfg = opts.init(opts_data,do_post_init=True)
+from mmgen.cfg import Config
+gcfg = Config( opts_data=opts_data, do_post_init=True )
 
 import mmgen_node_tools.Ticker as Ticker
 Ticker.gcfg = gcfg
@@ -206,6 +206,6 @@ cfg_in = get_cfg_in()
 
 cfg = make_cfg(gcfg._args,cfg_in)
 
-opts.post_init(gcfg)
+gcfg._post_init()
 
 main(cfg,cfg_in)
diff --git a/mmgen_node_tools/main_txfind.py b/mmgen_node_tools/main_txfind.py
index 4c0bcc2..cabed6f 100755
--- a/mmgen_node_tools/main_txfind.py
+++ b/mmgen_node_tools/main_txfind.py
@@ -20,7 +20,8 @@
 mmnode-txfind: Find a transaction in the blockchain or mempool
 """
 
-from mmgen.common import *
+from mmgen.cfg import Config
+from mmgen.util import msg,Msg,die
 
 opts_data = {
 	'text': {
@@ -62,7 +63,7 @@ async def main(txid):
 		msg(f'TxID: {txid}')
 
 	from mmgen.rpc import rpc_init
-	c = await rpc_init(cfg._proto)
+	c = await rpc_init(cfg)
 
 	exitval = 0
 	try:
@@ -82,7 +83,7 @@ async def main(txid):
 
 	return exitval
 
-cfg = opts.init(opts_data)
+cfg = Config(opts_data=opts_data)
 
 msgs = msg_data['quiet' if cfg.quiet else 'normal']
 
diff --git a/setup.cfg b/setup.cfg
index 6eb85ec..0cdbed1 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -23,7 +23,7 @@ python_requires = >=3.7
 include_package_data = True
 
 install_requires =
-	mmgen>=13.3.dev43
+	mmgen>=13.3.dev44
 
 packages =
 	mmgen_node_tools