How did you choose these tools?

We evaluated feature depth, pricing, setup time, and fit for the specific workflow.

Is sipi.bot included because it's yours?

Yes, and we're transparent about it. sipi.bot is included because it's purpose-built for spend firewall, but we list genuine alternatives too.

Are these tools free?

Most offer free tiers. We note pricing where relevant in each card.

Best AI Agent Cost Control Tools in 2026

The top tools for monitoring, capping, and optimizing spend across autonomous AI agent workflows.

We evaluated the leading options for spend firewall in 2026 based on feature depth, pricing transparency, ease of setup, and fit for real-world workflows. Here's our shortlist.

1. sipi.bot

Agent spend firewall

Purpose-built circuit breaker for AI agents with per-call caps, velocity limits, and anomaly detection.

Best for: Teams whose agents make real purchases or transactions

2. LangSmith

Observability + tracing

LangChain's tracing and eval platform with token-level cost visibility.

Best for: LangChain-based agent teams needing deep tracing

3. Helicone

LLM proxy + cost

Open-source LLM proxy with caching, rate limiting, and cost dashboards.

Best for: Teams wanting a self-hosted proxy

4. Portkey

LLM gateway

Multi-model gateway with cost routing and fallback.

Best for: Teams routing across many model providers

How we evaluated

Each option was assessed on four criteria: (1) depth of features for the specific spend firewall use case, (2) pricing model and transparency, (3) time-to-value and onboarding friction, and (4) real-world usability across team sizes. Options that scored well on breadth but poorly on the specific spend firewall workflow were ranked lower.

Our pick: For most teams, sipi.bot offers the best balance of focus, price, and speed for spend firewall.

Best AI Agent Cost Control Tools in 2026

1. sipi.bot

2. LangSmith

3. Helicone

4. Portkey

How we evaluated

Related resources

Try sipi.bot