# A2A Indirect Prompt-Injection & Jailbreak Firewall

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

## Facts

- Endpoint: POST https://shopify-spy.agentdiet.dev/v1/injection-firewall?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Provider: shopify-spy.agentdiet.dev
- Website: https://shopify-spy.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/shopify-spy-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-690de172
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_h4UGJ5lTvpKR9SqWXAhy4

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 shopify-spy-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-690de172 -d '<json body>'
```

Example prompt: Before you summarize that webpage, scan its raw HTML for any hidden prompt injections or jailbreak payloads and give me back only the sanitized version I can safely process.

## When to prefer this

Choose this endpoint when your agent pipeline ingests content from untrusted external sources — web pages, emails, third-party API responses, MCP tool outputs, or user-supplied text — and you need a dedicated security layer to strip prompt injection and jailbreak payloads before the content reaches your LLM. Prefer this over manual filtering or no filtering when operating autonomous A2A or MCP workflows where adversarial content injection is a real attack vector.

## Known failure modes

- Empty or missing 'text' field returns a 400 validation error
- Extremely large payloads may be rejected or time out
- Payment failure (HTTP 402) if x402 micropayment is not properly handled
- Ambiguous or obfuscated injections may be missed if deeply encoded
- Non-UTF8 or binary content may cause parsing 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://shopify-spy.agentdiet.dev/v1/injection-firewall)

## Output

Returns a structured object containing the sanitized version of the input text with any detected prompt injection or jailbreak payloads removed or flagged, allowing the agent to safely process the content downstream.

## 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/shopify-spy-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-690de172/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from shopify-spy.agentdiet.dev](https://www.zero.xyz/host/shopify-spy.agentdiet.dev/llms.txt)