Now in public beta
Wrap your OpenAI/Anthropic clients in 2 lines of code. Set budget caps, automate model downgrades, and stop runaway loops instantly.
MIT LicenseZero Dependencies
AI agents have unpredictable costs
A single agentic loop can burn through your entire monthly budget in minutes. One bad prompt, one recursive call, and you're looking at a four-figure surprise on your next invoice.
67%
of developers cite cost as #1 barrier to deploying AI agents
$4.2K
average unexpected bill from a single runaway agentic workflow
Estimated API Cost
$0.00
Looking normal...
Three layers of protection
TokenFence wraps your AI client locally. Zero latency overhead, full cost control.
Budget Caps
Set per-workflow spending limits. Never exceed your budget. Enforce hard limits at the SDK level before requests even fire.
Auto Downgrade
When 80% of budget is spent, automatically route to cheaper models. GPT-4o falls back to GPT-4o-mini seamlessly.
Kill Switch
Hard stop at budget limit. Graceful error handling, clean shutdown, no surprise bills. Your agents fail safely.
2 lines. That's it.
No config files, no dashboards to set up. Import, wrap, deploy.
How it works
Five steps from unprotected to fully guarded. All local, all fast.
01
Wrap your AI client
Import TokenFence and wrap your existing OpenAI or Anthropic client. Zero config required.
client = guard(openai.OpenAI())
02
Set your budget
Define spending limits per workflow, per user, or globally. Budgets reset on your schedule.
budget="$0.50"
03
Monitor in real-time
TokenFence tracks every token locally. No proxy, no external calls, no added latency.
# 0ms overhead
04
Auto-downgrade models
At 80% budget, requests automatically route to cheaper models. Quality degrades gracefully.
fallback="gpt-4o-mini"
05
Hard stop at limit
When budget is exhausted, TokenFence stops requests with a clean, catchable exception.
on_limit="stop"
Simple, transparent pricing
Start free. Upgrade when you need more protection.
Hobby
Free
For side projects and experimentation
- 50K requests/month
- Basic budget caps
- Single project
- Community support
- Core SDK access
Recommended
Pro
$49/mo
For production AI applications
- 500K requests/month
- Auto model downgrades
- Per-workflow budget caps
- Unlimited projects
- Email support
- Usage dashboard
Team
$149/mo
For growing teams and organizations
- 2M requests/month
- Everything in Pro
- Team management
- Priority support
- Advanced analytics
- Custom policies
Enterprise
Custom
For teams with advanced needs
- Unlimited requests
- SLA guarantee
- On-premise deployment
- Dedicated support
- Custom integrations
- SSO / SAML
- Audit logs
Frequently asked questions
Everything you need to know about TokenFence.
Stop burning money on runaway agents
Ship AI agents with confidence. Set budgets, enforce policies, stop runaway costs. Free to start, no credit card required.