# Arcjet (arcjet.com)

Checks each action an AI agent takes against prompt injection, PII, bot and policy rules before the call runs, and logs the decision.

- Atlas card: https://inite.ai/en/atlas/arcjet.com
- Site: https://arcjet.com
- For: developers and security teams running AI agents that take actions in apps, APIs and databases
- Categories: security
- Use not measured/100 · alive 100/100

## Used for

- block prompt injection in user input and tool output
- redact personal data before it reaches the model
- stop runaway agent loops from exhausting token budgets

## Price

- from 25 USD/month, no free plan (read 2026-10-17 on https://arcjet.com/pricing)

## For developers

- MCP server: com.arcjet/mcp (namespace; auth on 2026-10-17)
- Read 2026-10-17

## MCP server, measured daily

Server: https://api.arcjet.com/mcp, checked every day since 2026-10-19 (2 checks).

- Answered: measuring, 2 daily checks so far
- Median first answer: 221 ms
- Sign-in: OAuth (the client signs the user in)
- Method: https://inite.ai/en/atlas/mcp/report

## Your data

- Certifications stated: none
- Read 2026-10-17

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Source: INITE Atlas, https://inite.ai/en/atlas/arcjet.com. JSON: https://inite.ai/api/atlas/arcjet.com. MCP: https://inite.ai/api/mcp (atlas_lookup).