# 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 injection and jailbreak attacks, returning sanitized output.

## Facts

- Endpoint: POST https://domain-osint.agentdiet.dev/v1/prompt-firewall?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-344fd07c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_5AcqZGGtvsIfxNV_TszpM

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-344fd07c -d '<json body>'
```

Example prompt: Before you process this scraped webpage content, run it through the prompt injection firewall to check for any hidden adversarial instructions or jailbreak attempts — here's the raw HTML: <paste content>.

## When to prefer this

Use this endpoint when your AI agent is about to process untrusted external content — scraped web pages, third-party API responses, user emails, MCP tool outputs, or A2A payloads — and you need a fast, dedicated firewall layer to strip adversarial prompt injections before they reach your LLM. Prefer this over general content moderation endpoints when the threat model is specifically indirect prompt injection or jailbreak attempts targeting agent behavior.

## Known failure modes

- Empty or missing 'text' field returns a validation error
- Extremely large payloads may exceed processing limits
- Obfuscated or highly novel injection techniques may evade detection
- Non-text binary content may produce unexpected results
- Network timeout on unusually large HTML 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/prompt-firewall)

## Output

Returns a structured object indicating whether prompt injection or jailbreak content was detected in the input, along with sanitized text safe for downstream LLM consumption. Includes detection flags and cleaned payload output.

## 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-344fd07c/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)