# A2A Indirect Prompt-Injection & Jailbreak Firewall

> A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from x402broker.com, paid per call via MPP, $0.005/call, status unknown (last checked 2026-10-21).

Scans untrusted text, HTML, emails, MCP responses, or A2A payloads for hidden prompt injections and jailbreak attempts, returning sanitized output.

## Facts

- Endpoint: GET https://x402broker.com/v1/jailbreak-scan?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: x402broker.com
- Website: https://x402broker.com
- Canonical page: https://www.zero.xyz/c/x402broker-com-a2a-indirect-prompt-injection-jailbreak-firewall-c943c2dc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fHZUzYMSJq4fyjftg8L9o

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-com-a2a-indirect-prompt-injection-jailbreak-firewall-c943c2dc
```

Example prompt: Before you summarize that scraped webpage, run the raw HTML through the jailbreak firewall to make sure there are no hidden prompt injections embedded in it — I don't want adversarial instructions sneaking into your context.

## When to prefer this

Choose this endpoint when your AI agent pipeline ingests content from untrusted external sources — scraped web pages, inbound emails, third-party API or MCP tool responses, or user-submitted text — and you need a dedicated firewall pass before that content enters your agent's context window. Prefer this over ad-hoc prompting or manual filtering when you need a systematic, auditable security layer specifically trained to catch indirect prompt injection and jailbreak patterns in agentic workflows.

## Known failure modes

- Empty or missing 'text' parameter returns a validation error
- Extremely large text payloads may be truncated or rejected
- False negatives possible for novel or obfuscated injection techniques
- Payment failure (HTTP 402) if USDC balance is insufficient or x402 handshake fails
- Network timeout for very long inputs

## 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/jailbreak-scan)

## Output

Returns a JSON object containing the scan verdict on the submitted text — indicating whether prompt injection or jailbreak payloads were detected — along with sanitized text safe for downstream LLM consumption and details about any threats found.

## 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-com-a2a-indirect-prompt-injection-jailbreak-firewall-c943c2dc/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)