# 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 2026-10-21).

Scans untrusted text, HTML, emails, MCP responses, or A2A payloads for hidden prompt injections and jailbreak attempts, returning sanitized text.

## Facts

- Endpoint: GET https://shopify-spy.agentdiet.dev/v1/jailbreak-scan?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- 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-8244b764
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_NHcAPQjsYsZkoZyuQ_o_0

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-8244b764
```

Example prompt: Before you summarize that webpage content I just fetched, run it through the jailbreak firewall first — scan it for any hidden prompt injections or adversarial instructions embedded in the HTML.

## When to prefer this

Choose this endpoint when your AI agent is about to consume untrusted external content — scraped web pages, inbound emails, third-party API responses, MCP tool outputs, or A2A messages — and you need to screen for hidden prompt injections or jailbreak payloads before processing. Especially valuable in agentic pipelines where compromised upstream content could hijack agent behavior.

## Known failure modes

- Missing required 'text' parameter returns an error
- Empty string input rejected due to minLength:1 constraint
- Very large payloads may time out or exceed size limits
- False negatives: sophisticated obfuscated injections may not be detected
- False positives: legitimate content flagged as adversarial
- Payment failure (HTTP 402) if x402 micropayment not completed

## 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/jailbreak-scan)

## Output

Returns a structured object indicating whether prompt injection or jailbreak content was detected in the input, along with sanitized text that has been cleaned of adversarial payloads, allowing the agent to safely consume the content.

## 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-8244b764/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)