# A2A Indirect Prompt-Injection & Jailbreak Firewall

> A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from defi-yield.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://defi-yield.agentdiet.dev/v1/llm-jailbreak-defense?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: defi-yield.agentdiet.dev
- Website: https://defi-yield.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/defi-yield-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-fa89a8c1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7TwNpvc-OqRTUvuoiqW1O

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 defi-yield-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-fa89a8c1
```

Example prompt: Before you process this web page I just scraped, run it through the prompt injection firewall to check for hidden jailbreak instructions and give me the sanitized version: [paste HTML or text here].

## When to prefer this

Choose this endpoint when your AI agent processes untrusted external content — scraped web pages, inbound emails, third-party API responses, or MCP/A2A payloads — and you need a dedicated firewall layer before that content reaches your LLM. Prefer this over generic content filters when the threat model specifically involves indirect prompt injection or jailbreak attempts targeting an AI agent rather than traditional spam or malware detection.

## Known failure modes

- Empty or missing 'text' parameter returns a 400 validation error
- Extremely long inputs may be truncated or rejected
- Sophisticated obfuscated injections may evade detection (false negatives)
- Payment failure (HTTP 402) if x402 USDC balance is insufficient
- Network timeout on large HTML payloads
- Non-text binary content may not be correctly parsed

## 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://defi-yield.agentdiet.dev/v1/llm-jailbreak-defense)

## Output

Returns a JSON object containing the sanitized version of the input text with any detected prompt injection or jailbreak payloads removed or flagged, along with detection signals indicating whether malicious content was 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/defi-yield-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-fa89a8c1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from defi-yield.agentdiet.dev](https://www.zero.xyz/host/defi-yield.agentdiet.dev/llms.txt)