diff --git a/llmage/accounting.py b/llmage/accounting.py
index 0a018c5..cbd3af8 100644
--- a/llmage/accounting.py
+++ b/llmage/accounting.py
@@ -1,3 +1,6 @@
+import asyncio
+import time
+from datetime import datetime
 from appPublic.log import exception, debug
 from appPublic.uniqueID import getID
 from appPublic.dictObject import DictObject
@@ -52,17 +55,27 @@ async def checkCustomerBalance(llmid, userorgid):
 	debug(f'{userorgid=} checkCustomerBalance() failed')
 	return False
 
-async def llm_accounting(request, llmusage):
-	env = request._run_ns
+async def llm_accounting(llmusage):
+	env = ServerEnv()
 	llmid = llmusage.llmid
-	async with get_sor_context(request._run_ns, 'llmage') as sor:
+	async with get_sor_context(env, 'llmage') as sor:
 		sql = "select * from llm where id=${llmid}$"
 		recs = await sor.sqlExe(sql, {'llmid': llmusage.llmid})
 		if len(recs) == 0:
+			ns = {
+				'id': llmusage.id,
+				'accounting_status': 'failed'
+			}
+			await sor.U('llmusage', ns)
 			e = Exception(f'llm not found({llmid})')
 			exception(f'{e}')
 			raise e
 		if recs[0].ppid is None:
+			ns = {
+				'id': llmusage.id,
+				'accounting_status': 'failed'
+			}
+			await sor.U('llmusage', ns)
 			e = Exception(f'llm ({llmid}) donot has a pricing_program')
 			exception(f'{e}')
 			raise e
@@ -133,3 +146,52 @@ async def llm_accounting(request, llmusage):
 		}
 		await sor.U('llmusage', ns)
 
+async def get_accounting_llmusages(luid=None):
+	env = ServerEnv()
+	lus = []
+	t = time.time - 20
+	dt = datetime.fromtimestamp(t)
+	tsstr = dt.strftime('%Y-%m-%d %H:%M:%S.') + f'{dt.microsecond // 1000:03d}'
+	async with get_sor_context(env, 'llmage') as sor:
+		sql = """select a.*. b.ppid 
+from llmusage a, llm b 
+where a.llmid = b.id 
+	and a.status = 'SUCCEEDED'
+	and a.use_time < ${tsstr}$
+	and a.accounting_status='created'"""
+		ns = {'tsstr': tsstr}
+		if luid:
+			sql += " and a.id=${luid}$"
+			ns['luid'] = luid
+		recs = await sor.sqlExe(sql, ns)
+		for r in recs:
+			if r.usages is None:
+				io = json.loads(r.ioinfo)
+				if len(io['output']) == 0:
+					llmusage.accounting_status = 'failed'
+					await sor.U('llmusage', {'id': llmusage.id, 'accounting_status': 'failed'})
+					continue
+				r.usages = io['output'][-1]['usage']
+			if r.usages is None:
+				llmusage.accounting_status = 'failed'
+				await sor.U('llmusage', {'id': llmusage.id, 'accounting_status': 'failed'})
+				continue
+			try:
+				r = await llm_charging(sor, llmusage.ppid, llmusage)
+			except Exception as e:
+				continue
+			llmusage.amount = r.amount
+			llmusage.cost = r.cost
+			await sor.U('llmusage', llmusage.copy())
+			lus.append(r)
+	return lus
+
+	async def backend_accounting():
+		env = ServerEnv()
+		debug(f'backend accounting started ...')
+		while True:
+			lus = await get_accounting_llmusages()
+			for lu in lus:
+				await llm_accounting(lu)
+			await asyncio.sleep(0.1)
+
diff --git a/llmage/asyncinference.py b/llmage/asyncinference.py
index fd0cda0..3a00c94 100644
--- a/llmage/asyncinference.py
+++ b/llmage/asyncinference.py
@@ -226,7 +226,7 @@ async def query_task_status(request, upappid, apiname, luid, userid, taskid):
 					if llmusage.accounting_status != 'accounted' \
 									and changed.amount > 0.00001:
 						try:
-							await llm_accounting(request, llmusage)
+							await llm_accounting(llmusage)
 						except Exception as e:
 							debug(f'{changed=} accounting failed,{e=} ')
 					return
diff --git a/llmage/callback.py b/llmage/callback.py
index 57dbbec..c09ed68 100644
--- a/llmage/callback.py
+++ b/llmage/callback.py
@@ -49,6 +49,6 @@ async def asynctask_callbacka(appname, apiname, params_kw)
 			raise e
 
 	if llmusage:
-		await llm_accounting(request, llmusage)
+		await llm_accounting(llmusage)
 
 		
diff --git a/llmage/init.py b/llmage/init.py
index 04c5af7..9eab240 100644
--- a/llmage/init.py
+++ b/llmage/init.py
@@ -1,6 +1,7 @@
 from appPublic.base64_to_file import hex2base64
 from appPublic.registerfunction import RegisterFunction
 from ahserver.serverenv import ServerEnv
+from ahserver.configuredServer import add_cleanupctx
 from .keling import keling_token
 from .jimeng import jimeng_auth_headers
 from .utils import (
@@ -22,6 +23,7 @@ from .llmclient import (
 from .accounting import (
 	checkCustomerBalance, 
 	llm_charging,
+	backend_accounting,
 	llm_accounting
 )
 
@@ -31,6 +33,11 @@ from .asyncinference import (
 	get_today_asynctask_list
 )
 
+async def start_backend(app):
+	task = asyncio.create_task(abackend_accounting())
+	yield
+	task.cancel()
+
 def load_llmage():
 	env = ServerEnv()
 	env.llm_query_orders = llm_query_orders
@@ -54,3 +61,4 @@ def load_llmage():
 	env.llm_query_price = llm_query_price
 	rf = RegisterFunction()
 	rf.register('jimeng_auth_headers', jimeng_auth_headers)
+	add_cleanupctx(start_backend)
diff --git a/llmage/llmclient.py b/llmage/llmclient.py
index ae1acfc..9ead916 100644
--- a/llmage/llmclient.py
+++ b/llmage/llmclient.py
@@ -114,7 +114,7 @@ async def uapi_request(request, llm, sor, callerid, callerorgid, params_kw=None)
 		llmusage.accounting_status = 'created'
 		await write_llmusage(llmusage)
 		if llmusage.amount > 0.0001:
-			await llm_accounting(request, llmusage)
+			await llm_accounting(llmusage)
 
 	except Exception as e:
 		exception(f'{e=},{format_exc()}')
diff --git a/llmage/syncinference.py b/llmage/syncinference.py
index 625569c..737d6f4 100644
--- a/llmage/syncinference.py
+++ b/llmage/syncinference.py
@@ -79,7 +79,7 @@ async def sync_uapi_request(request, llm, sor, callerid, callerorgid, params_kw=
 		yield b
 		await write_llmusage(llmusage)
 		if llmusage.amount > 0.0001:
-			await llm_accounting(request, llmusage)
+			await llm_accounting(llmusage)
 	except Exception as e:
 		exception(f'{e=},{format_exc()}')
 		estr = erase_apikey(e)