# A2A Indirect Prompt-Injection & Jailbreak Firewall

> A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from shopify-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://shopify-intel.agentdiet.dev/v1/prompt-shield?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Provider: shopify-intel.agentdiet.dev
- Website: https://shopify-intel.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/shopify-intel-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-128f3308
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_hz1gZplvOF_2SURoE-xPq

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-intel-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-128f3308 -d '<json body>'
```

Example prompt: Before I process this webpage content my scraper just pulled, can you scan it for hidden prompt injections or jailbreak payloads and give me the sanitized version?

## When to prefer this

Choose this endpoint when your AI agent pipeline ingests untrusted external content — scraped web pages, emails, third-party tool responses, or A2A payloads — and you need to sanitize it before passing it to an LLM to prevent indirect prompt injection or jailbreak attacks. It is especially valuable in autonomous agent loops where tool outputs feed back into the context window without human review.

## Known failure modes

- Empty or missing 'text' field returns a 400 validation error
- Payload too large may result in a timeout or size-limit error
- Ambiguous injection patterns may go undetected if obfuscated beyond heuristic thresholds
- Payment required (HTTP 402) if x402 micropayment header is missing or invalid
- Network latency spikes may delay response for very large HTML inputs

## 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-intel.agentdiet.dev/v1/prompt-shield)

## Output

Returns a JSON object containing the sanitized version of the input text with any detected prompt injection or jailbreak content neutralized, along with detection signals indicating whether an attack 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/shopify-intel-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-128f3308/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from shopify-intel.agentdiet.dev](https://www.zero.xyz/host/shopify-intel.agentdiet.dev/llms.txt)