# A2A Indirect Prompt-Injection & Jailbreak Firewall

> A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from llms-generator.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://llms-generator.agentdiet.dev/v1/llm-guard?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: llms-generator.agentdiet.dev
- Website: https://llms-generator.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/llms-generator-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-881ffc86
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_d3XxmUvFt6i3AO9sDPX9M

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 llms-generator-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-881ffc86
```

Example prompt: Before you process this scraped web page, run it through the prompt-injection firewall to check for hidden instructions or jailbreak payloads and give me the sanitized version.

## When to prefer this

Choose this endpoint when your agent pipeline ingests untrusted external content — web pages, emails, tool responses, or A2A payloads — and you need a lightweight, per-call firewall check before passing that content to an LLM. Ideal for multi-agent architectures where one agent's output becomes another's input and cross-agent prompt injection is a concern.

## Known failure modes

- Empty or missing 'text' parameter returns a 400 validation error
- Very large payloads may time out or be truncated
- Obfuscated or novel injection techniques may evade detection
- Non-UTF-8 encoded content may cause parsing errors
- Payment not fulfilled returns HTTP 402 requiring x402 USDC payment

## 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://llms-generator.agentdiet.dev/v1/llm-guard)

## Output

Returns a JSON object containing the scan result for the submitted text, indicating whether prompt injection or jailbreak payloads were detected, along with the sanitized version of the input text safe for downstream LLM consumption.

## 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/llms-generator-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-881ffc86/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from llms-generator.agentdiet.dev](https://www.zero.xyz/host/llms-generator.agentdiet.dev/llms.txt)