# A2A Indirect Prompt-Injection & Jailbreak Firewall

> A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from sec-intel.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://sec-intel.agentdiet.dev/v1/mcp-injection-firewall?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Provider: sec-intel.agentdiet.dev
- Website: https://sec-intel.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/sec-intel-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-a3d6408f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XnnOVZFa_kh-0QX4OmTdL

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 sec-intel-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-a3d6408f -d '<json body>'
```

Example prompt: Before you process this scraped webpage content, run it through the prompt-injection firewall to check for any hidden instructions or jailbreak payloads embedded in the text, then give me the sanitized version.

## When to prefer this

Choose this endpoint when your AI agent is processing content from untrusted external sources — scraped web pages, inbound emails, third-party MCP/A2A tool responses, or user-submitted text — and you need a dedicated security firewall layer before passing that content into your agent's context window. Prefer this over generic content filters when you specifically need protection against indirect prompt injection and jailbreak techniques targeting LLM-based pipelines.

## Known failure modes

- Empty or missing 'text' field returns a validation error
- Extremely large payloads may be rejected or truncated
- Service unavailability returns a 503 or payment-required 402 error if USDC balance is insufficient
- Ambiguous or highly obfuscated injections may not be detected with 100% accuracy
- Non-text binary content may fail to parse correctly

## 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://sec-intel.agentdiet.dev/v1/mcp-injection-firewall)

## Output

Returns a structured object containing the sanitized version of the input text with any detected prompt injection or jailbreak content removed or flagged, along with detection metadata indicating whether a threat 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/sec-intel-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-a3d6408f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from sec-intel.agentdiet.dev](https://www.zero.xyz/host/sec-intel.agentdiet.dev/llms.txt)