# x402broker Prompt Injection & Jailbreak Firewall

> x402broker Prompt Injection & Jailbreak Firewall is a paid API for AI agents from x402broker.com, paid per call via x402 or MPP, $0.005/call, status unknown (last checked 2026-10-20).

Scans untrusted text (web pages, emails, MCP responses, A2A payloads) for hidden prompt injections and jailbreak attempts, returning sanitized content.

## Facts

- Endpoint: GET https://x402broker.com/v1/prompt-firewall?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402, MPP
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402broker-prompt-injection-jailbreak-firewall-f163a4d6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_0nFB6wTX1BJ6E5uVEWn_Z

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability x402broker-prompt-injection-jailbreak-firewall-f163a4d6
```

Example prompt: Before you summarize that web page content, run it through the prompt injection firewall to check for any hidden jailbreak instructions embedded in the text.

## When to prefer this

Choose this endpoint when you need to safely process untrusted external content (web pages, emails, API responses, tool outputs) before feeding it into an LLM or agentic pipeline. Ideal for multi-agent systems, MCP orchestration, and A2A workflows where indirect prompt injection is a real attack surface. Prefer this over generic content filters when your threat model specifically includes adversarial text trying to manipulate an AI agent's behavior.

## Known failure modes

- Missing required 'text' query parameter returns an error
- Extremely long input may be truncated or rejected
- Obfuscated or novel injection patterns may evade detection
- Non-text or binary content may not be handled correctly
- Payment failure (x402) blocks the request

## How this service works

Scans untrusted web pages, emails, MCP responses, or A2A payloads for hidden prompt injections and returns sanitized text. (Live x402 v2, IETF MPP & MCP endpoint at https://x402broker.com/v1/prompt-firewall)

## Output

Returns a sanitized version of the input text with hidden prompt injections removed or flagged, along with detection signals indicating whether injection attempts or jailbreak patterns were found in the original content.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "text"
 ],
 "properties": {
  "text": {
   "type": "string",
   "minLength": 1,
   "description": "Untrusted text, HTML, or tool output to scan for hidden prompt injection or jailbreak payloads"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402broker-prompt-injection-jailbreak-firewall-f163a4d6/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402broker.com](https://www.zero.xyz/host/x402broker.com/llms.txt)