# A2A Indirect Prompt-Injection & Jailbreak Firewall

> A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from company-enrich.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 output.

## Facts

- Endpoint: GET https://company-enrich.agentdiet.dev/v1/system-prompt-guard?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: company-enrich.agentdiet.dev
- Website: https://company-enrich.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/company-enrich-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-18a8a1e0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_cBsY5shakBssW6ICF5mbB

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 company-enrich-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-18a8a1e0
```

Example prompt: Before you summarize that webpage I just fetched, scan its full HTML text for any hidden prompt injections or jailbreak instructions — give me the sanitized version I can safely process.

## When to prefer this

Choose this endpoint when your AI agent pipeline consumes content from untrusted external sources — web scrapes, inbound emails, third-party MCP/A2A tool responses — and you need a lightweight, per-call firewall to detect and strip hidden prompt injections before that content influences agent behavior. Prefer it over manual content filtering when you need structured detection results and sanitized output in a single call, especially within an agentic workflow where speed and automation matter.

## Known failure modes

- Empty or missing 'text' parameter returns a validation error
- Very large payloads may time out or be truncated
- Highly obfuscated or novel injection techniques may evade detection
- Non-text binary content may not be correctly parsed
- HTTP 402 payment required if x402 payment header is missing or insufficient

## 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://company-enrich.agentdiet.dev/v1/system-prompt-guard)

## Output

Returns an object indicating whether prompt injection or jailbreak content was detected in the submitted text, along with a sanitized version of the text with malicious instructions removed or flagged, enabling safe downstream use by an AI agent.

## 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/company-enrich-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-18a8a1e0/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from company-enrich.agentdiet.dev](https://www.zero.xyz/host/company-enrich.agentdiet.dev/llms.txt)