# 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 injection and jailbreak attempts, returning sanitized text.

## Facts

- Endpoint: GET https://cve-intel.agentdiet.dev/v1/prompt-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-e56f25b6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Z0_BAF7MQxiVNBpkp7yxV

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-e56f25b6
```

Example prompt: Before you summarize that webpage, run its raw HTML through the prompt-injection firewall at cve-intel.agentdiet.dev to make sure there are no hidden instructions embedded in it that could hijack your behavior.

## When to prefer this

Choose this endpoint when your AI agent needs to process content from untrusted third-party sources — scraped web pages, inbound emails, external API responses, MCP tool outputs, or A2A agent payloads — before feeding that content into an LLM. Prefer this over generic content filters when the specific threat model is indirect prompt injection or jailbreaking rather than spam, hate speech, or NSFW content.

## Known failure modes

- Empty or missing 'text' parameter returns a 400 validation error
- Extremely large payloads may be rejected or time out
- Obfuscated or novel injection techniques may evade detection
- HTTP 402 Payment Required if USDC micropayment via x402 is not provided
- Service unavailability returns 5xx errors

## 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-shield)

## Output

Returns a sanitized version of the submitted text with prompt injection and jailbreak payloads identified and removed or flagged, along with detection metadata indicating whether an attack was found.

## 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-e56f25b6/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)