Forsig
Runtime guardrails for OpenAI
OpenAI compatible today · Anthropic & Google coming soon

Predictable AI spend.Enforced at runtime.

Forsig sits between your app and OpenAI to enforce budgets, velocity caps, model allowlists, and instant shutdown — then settles exact usage for audit and reporting.

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✅ Keep your OpenAI SDK
✅ Drop-in baseURL change
✅ Audit-grade logs
import OpenAI from "openai";

const client = new OpenAI({
  apiKey: process.env.OPENAI_API_KEY,
  baseURL: "https://api.forsig.com/v1", // point to Forsig gateway
  defaultHeaders: {
    "x-forsig-allowance-key": process.env.FORSIG_ALLOWANCE_KEY!,
  },
});

const resp = await client.chat.completions.create({
  model: "gpt-4o-mini",
  messages: [{ role: "user", content: "Summarize this ticket..." }],
});

OpenAI compatible today. Anthropic & Google are coming soon.

How it works

Forsig enforces policy between your app and OpenAI

Enforcement travels with the allowance key: preflight checks, safe execution, and exact settlement for reporting.

Your app
You call the model as usual.
Forsig gateway
Preflight budgets, velocity caps, and allowlists.
OpenAI
Request executes using your provider key.
Audit trail
Settle exact tokens & cost breakdowns.
BudgetsVelocity capsModel allowlistFreezeKill switch
Product

Runtime guardrails for cost and control

Strong defaults, operator controls, and audit-ready visibility — without changing how your team builds.

Runtime enforcement
Intercept every request and verify it against budgets, velocity caps, and allowlists before it runs.
Instant operator controls
Freeze an agent immediately when you see anomalies — or flip a kill switch during an incident.
Allowance keys
Issue scoped keys that carry policy with them. Rotate safely, revoke instantly, and share prefixes.
Full visibility
Audit-grade logs: spend, request counts, tokens, and model breakdowns — ready for ops and finance.
Pricing

Start free. Upgrade when you’re scaling.

We’re onboarding early teams now. Join the waitlist to get access.

Starter
Early access
$0
For prototypes and early production.
  • Allowance keys
  • Budgets + velocity caps
  • Audit logs
  • Freeze controls
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Team
Contact
Custom
Higher limits, support, and production ops help.
  • Role-based access
  • Exports & reporting
  • SLA + support
  • Deployment guidance
Talk to founders
Waitlist

Get early access to Forsig

Invitation-only onboarding. We’ll email you when your spot is ready.

OpenAI ✅Anthropic ⏳Google ⏳