TokenFence

AI agents are powerful tools, but they can become very expensive very quickly. Sometimes, a small mistake in a prompt or a loop in the agent's process can cause costs to skyrocket, leading to surprisingly large bills. Many developers find the unpredictable cost of AI agents to be a major reason they hesitate to use them. Some have even faced bills of thousands of dollars from a single AI workflow that went out of control.

TokenFence provides a way to manage these costs. It works by adding a protective layer around AI services like OpenAI and Anthropic with just a couple of lines of code. This helps control spending without slowing down the AI's performance.

TokenFence uses three main methods to keep costs in check:

• Budget Caps:You can set a spending limit for each AI task. These limits are strictly enforced before any requests are even sent, ensuring you never go over your budget.
• Auto Downgrade:When your spending reaches 80% of the set budget, TokenFence can automatically switch to using less expensive AI models. For example, it can switch from a high-end model like GPT-4o to a more affordable one like GPT-4o-mini.
• Kill Switch:If the budget limit is reached, TokenFence stops all activity. This ensures a safe shutdown and prevents unexpected charges.

Using TokenFence is simple. Developers can add a function calledguardto their existing AI code. This function helps wrap the AI client, set a budget, monitor spending in real time with no performance loss, enable automatic model downgrades, and enforce the spending limit.

TokenFence works with popular AI development tools such as OpenAI, Anthropic, CrewAI, AutoGen, LangChain, and LangGraph. It is available for both Python and TypeScript.

Pricing

TokenFence offers different plans to suit various needs. There is a free 'Hobby' plan that allows for up to 50,000 requests per month and includes basic budget controls. For production use, the 'Pro' plan costs $49 per month and supports up to 500,000 requests per month, with features like automatic model downgrades and per-workflow budget caps. The 'Team' plan is available for $149 per month, offering up to 2 million requests per month and additional features for team collaboration and advanced analytics. An 'Enterprise' plan with custom pricing is also available for businesses with more complex requirements.

Vibes

TokenFence helps developers feel more confident when launching AI agents. It allows them to set clear budgets, enforce spending rules, and prevent runaway costs. The service offers a free starting option, so no credit card is needed to begin managing AI expenses.