OpenAI-compatible proxy -- zero code changes

One line of code. 100% schema-valid LLM output.

Drop-in proxy that validates, auto-repairs, and guarantees structured output from any LLM. Works with your existing OpenAI SDK.

Before

After

baseURL: "https://
  api.openai.com/v1"

baseURL: "https://
  <worker>.workers.dev/v1"

That is it. One URL change. Every response is now schema-validated.

Structured output that never breaks

Stop writing retry loops. Let SchemaGuard handle validation, repair, and fallback.

Define your output shape with Zod, JSON Schema, or TypeScript types. Every LLM response is validated before it reaches your app.

When output fails validation, SchemaGuard automatically retries with targeted prompts that fix only the broken fields.

Primary model fails? SchemaGuard cascades to your fallback chain -- GPT-4o to Claude to Gemini -- until you get valid output.

Use Zod, JSON Schema, or TypeScript interfaces to describe the exact shape you need.

Replace your provider base URL with SchemaGuard. No SDK changes, no new dependencies.

Every response is guaranteed schema-valid. Broken outputs are auto-repaired or cascaded.

Free forever for small projects. Pay only when you scale.

For side projects

$0/month

For production apps

$29/month

For engineering teams

$99/month

One URL change. 100% valid structured output. Start in under 2 minutes.