# A2A Indirect Prompt-Injection & Jailbreak Firewall

> A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from sec-intel.agentdiet.dev, 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://sec-intel.agentdiet.dev/v1/injection-firewall?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: sec-intel.agentdiet.dev
- Website: https://sec-intel.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/sec-intel-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-100c9e57
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_E3YgkGWua_wgvc8T8a3yt

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 sec-intel-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-100c9e57
```

Example prompt: Before processing this scraped web page, run it through the injection firewall to check for any hidden prompt injections or jailbreak payloads — here's the raw HTML: '<html>...attacker content...</html>'.

## When to prefer this

Choose this endpoint when your AI agent pipeline ingests untrusted external content — web pages, emails, user input, or third-party tool responses — before passing that content to an LLM. This is especially critical in agentic workflows where prompt injection could hijack agent behavior. Prefer this over generic content filters when you specifically need to detect adversarial LLM-targeted injections and jailbreak patterns rather than spam or malware.

## Known failure modes

- Empty or missing 'text' parameter returns a validation error
- Very large payloads may be truncated or rejected
- Novel or obfuscated injection techniques may evade detection
- Non-text binary content may produce unexpected results
- Network timeout if the service is temporarily unavailable
- Payment failure (HTTP 402) if USDC balance is insufficient

## 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://sec-intel.agentdiet.dev/v1/injection-firewall)

## Output

Returns a scanned result object indicating whether prompt injection or jailbreak content was detected, along with sanitized text with malicious instructions removed or neutralized, allowing the agent to safely process the cleaned payload.

## 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/sec-intel-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-100c9e57/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from sec-intel.agentdiet.dev](https://www.zero.xyz/host/sec-intel.agentdiet.dev/llms.txt)