# A2A Indirect Prompt-Injection & Jailbreak Firewall

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

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

## Facts

- Endpoint: GET https://email-verify.agentdiet.dev/v1/indirect-injection-guard?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: email-verify.agentdiet.dev
- Website: https://email-verify.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/email-verify-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-f4bc5db8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_T_WPUAL3D1Cz5XbP94b7E

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 email-verify-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-f4bc5db8
```

Example prompt: Before passing this scraped web page content to the rest of my pipeline, scan it for any hidden prompt injections or jailbreak payloads and give me the sanitized version: '<html>...page content here...</html>'

## When to prefer this

Choose this endpoint when your agent pipeline ingests untrusted external content — scraped web pages, inbound emails, third-party MCP/A2A responses, or user-supplied text — and you need a real-time firewall check before processing. Prefer this over generic content filtering when the threat model is specifically prompt injection and jailbreak payloads targeting LLM agents.

## Known failure modes

- Empty or missing 'text' parameter returns a validation error
- Very large payloads may be truncated or rejected
- Highly obfuscated injections (e.g. Unicode steganography) may evade detection
- Service unavailability returns HTTP 402 or 5xx errors
- False positives may flag legitimate instructional content as injections

## 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://email-verify.agentdiet.dev/v1/indirect-injection-guard)

## Output

Returns a structured object containing the sanitized version of the submitted text and indicators of any detected prompt injection or jailbreak patterns found within it, allowing agents to safely consume external 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/email-verify-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-f4bc5db8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from email-verify.agentdiet.dev](https://www.zero.xyz/host/email-verify.agentdiet.dev/llms.txt)