# A2A Indirect Prompt-Injection & Jailbreak Firewall

> A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from domain-osint.agentdiet.dev, paid per call via MPP, $0.005/call, status unknown (last checked 2026-10-23).

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

## Facts

- Endpoint: POST https://domain-osint.agentdiet.dev/v1/indirect-injection-guard?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Provider: domain-osint.agentdiet.dev
- Website: https://domain-osint.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/domain-osint-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-c6161c0d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ZwAAgfeLQ63wyW0YRuEmz

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 domain-osint-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-c6161c0d -d '<json body>'
```

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

## When to prefer this

Choose this endpoint when your AI agent or pipeline is about to consume untrusted external content — scraped web pages, third-party API responses, MCP tool outputs, inbound emails, or A2A payloads — and you need a dedicated firewall pass before feeding that content to an LLM. It is especially valuable in multi-agent architectures where one agent's output becomes another's input, creating indirect injection attack surfaces. Prefer this over generic content filters when you specifically need prompt-injection and jailbreak detection tuned to LLM adversarial patterns.

## Known failure modes

- Empty or missing 'text' field returns a 400 validation error
- Extremely large payloads may exceed size limits and return a 413 error
- Ambiguous or novel injection techniques may not be detected (false negatives)
- Non-text binary content passed as string may produce garbled sanitization results
- Network timeouts on slow connections may interrupt scanning of large documents

## 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://domain-osint.agentdiet.dev/v1/indirect-injection-guard)

## Output

Returns a structured object containing the sanitized version of the input text with any detected prompt injection or jailbreak payloads identified and removed or flagged, enabling safe downstream consumption by LLM pipelines or agentic workflows.

## 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/domain-osint-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-c6161c0d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from domain-osint.agentdiet.dev](https://www.zero.xyz/host/domain-osint.agentdiet.dev/llms.txt)