SpendFirewall integration
SpendFirewall + LangChain
Add SpendFirewall as a callback handler in LangChain. Every tool call and LLM invocation is policy-checked against your agent's spend rules.
How the integration works
Add SpendFirewall as a callback handler in LangChain. Every tool call and LLM invocation is policy-checked against your agent's spend rules. The integration is a 5ms policy check inserted between your agent's spend intent and the actual langchain call.
Setup
- Create a SpendFirewall account and get your API key
- Add the SpendFirewall SDK to your LangChain integration
- Configure your spend policy: per-transaction limit, daily ceiling, merchant allowlist
- Every LangChain call now passes through the policy check
What gets enforced
- Per-transaction cost ceiling
- Daily spend ceiling
- Velocity cap (transactions per minute)
- Merchant allowlist
- Audit trail for every transaction
Frequently asked questions
Does this slow down my agent?
No. The policy check adds 5ms of latency, far below typical network latency to LangChain.
Can I disable the policy mid-run?
Only with admin override. Disabling is logged and alerted on.