# A2A Indirect Prompt-Injection & Jailbreak Firewall

> A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from alpha-stream.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 text.

## Facts

- Endpoint: GET https://alpha-stream.agentdiet.dev/v1/llm-guard?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: alpha-stream.agentdiet.dev
- Website: https://alpha-stream.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/alpha-stream-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-3a86ea1a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Y-Sm9_U5lgvTuxqZmwAtF

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 alpha-stream-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-3a86ea1a
```

Example prompt: Before you process this webpage I just scraped, run it through the prompt injection firewall to check for any hidden instructions or jailbreak payloads and give me the sanitized version.

## When to prefer this

Choose this endpoint when your agent is processing untrusted external content — scraped web pages, user-submitted text, third-party API responses, MCP tool outputs, or A2A payloads — before feeding them into an LLM context. It is specifically designed for AI agent pipelines that need to neutralize indirect prompt injection and jailbreak attacks embedded in content from the open web or untrusted sources.

## Known failure modes

- Empty or missing 'text' parameter returns a validation error
- Very large payloads may exceed size limits or timeout
- False negatives possible for novel or obfuscated injection techniques
- Service unavailability returns HTTP 402 or 5xx errors
- Non-text binary content may not be properly analyzed

## 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://alpha-stream.agentdiet.dev/v1/llm-guard)

## Output

Returns a structured object indicating whether prompt injection or jailbreak content was detected in the input text, along with the sanitized version of the text with malicious instructions removed or flagged.

## 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/alpha-stream-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-3a86ea1a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from alpha-stream.agentdiet.dev](https://www.zero.xyz/host/alpha-stream.agentdiet.dev/llms.txt)