# A2A Indirect Prompt-Injection & Jailbreak Firewall

> A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from whale-momentum.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 injection and jailbreak attempts, returning sanitized output.

## Facts

- Endpoint: GET https://whale-momentum.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: whale-momentum.agentdiet.dev
- Website: https://whale-momentum.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/whale-momentum-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-8171ebff
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_smFqV6bh55vAYBikH3smw

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 whale-momentum-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-8171ebff
```

Example prompt: Before you process this scraped webpage content, run it through the indirect injection guard to check for hidden prompt injections or jailbreak payloads and give me the sanitized version: [paste raw HTML or text here].

## When to prefer this

Choose this endpoint when your AI agent is about to process content from untrusted external sources — scraped web pages, user-submitted emails, third-party MCP/A2A tool responses — and you need a dedicated security layer to strip adversarial instructions before they can hijack your agent's behavior. Prefer it over generic content filters when the threat model is specifically indirect prompt injection or jailbreak payloads targeting LLMs.

## Known failure modes

- Empty or missing 'text' parameter returns a validation error
- Extremely large payloads may time out or be truncated
- Obfuscated or novel injection techniques may evade detection
- Non-text binary content may not be parseable
- Payment failure via x402 results in 402 response blocking the call

## 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://whale-momentum.agentdiet.dev/v1/indirect-injection-guard)

## Output

Returns a structured object indicating whether prompt injection or jailbreak content was detected in the input text, along with a sanitized version of the text with malicious instructions stripped or flagged, enabling safe downstream processing by AI agents.

## 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/whale-momentum-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-8171ebff/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from whale-momentum.agentdiet.dev](https://www.zero.xyz/host/whale-momentum.agentdiet.dev/llms.txt)