# A2A Indirect Prompt-Injection & Jailbreak Firewall

> A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from cve-intel.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 content.

## Facts

- Endpoint: GET https://cve-intel.agentdiet.dev/v1/prompt-injection-shield?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: cve-intel.agentdiet.dev
- Website: https://cve-intel.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/cve-intel-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-7acb1444
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_YaMslxpQzAC6y00mg6Phr

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 cve-intel-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-7acb1444
```

Example prompt: Before you process that webpage I just fetched, scan the raw HTML for any hidden prompt injections or jailbreak instructions and give me the sanitized version I can safely use.

## When to prefer this

Use this endpoint whenever your AI agent is about to process content from an untrusted external source — scraped web pages, inbound emails, third-party API/MCP responses, or user-submitted text — before that content influences the agent's behavior. Prefer this over generic content moderation APIs when your concern is specifically prompt injection and jailbreak attacks targeting LLM agents rather than general harmful content. Especially valuable in agentic pipelines where an attacker-controlled web page or tool response could hijack the agent mid-task.

## Known failure modes

- Missing required 'text' parameter returns a 400 error
- Empty string input rejected due to minLength:1 constraint
- Very large payloads may time out or be truncated
- Payment not fulfilled (x402) returns 402 Payment Required
- Service unavailable returns 5xx error
- Sophisticated obfuscated injections may evade detection (false negatives possible)

## 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://cve-intel.agentdiet.dev/v1/prompt-injection-shield)

## Output

Returns a JSON object containing the scan result for the submitted text, including whether a prompt injection or jailbreak payload was detected and a sanitized version of the input text safe for downstream agent consumption.

## 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/cve-intel-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-7acb1444/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from cve-intel.agentdiet.dev](https://www.zero.xyz/host/cve-intel.agentdiet.dev/llms.txt)