# A2A Indirect Prompt-Injection & Jailbreak Firewall

> A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from json-repair.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 output.

## Facts

- Endpoint: GET https://json-repair.agentdiet.dev/v1/injection-firewall?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: json-repair.agentdiet.dev
- Website: https://json-repair.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/json-repair-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-21e3e898
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8W2jAeB79JQNVMA1raayv

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 json-repair-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-21e3e898
```

Example prompt: Before you process that scraped webpage, scan it through the prompt-injection firewall first — I need to make sure the HTML doesn't contain any hidden jailbreak instructions or indirect prompt injection payloads trying to hijack you.

## When to prefer this

Choose this endpoint when your agent pipeline ingests content from untrusted external sources — scraped web pages, user-submitted text, third-party tool outputs, MCP responses, or A2A payloads — and you need to detect and strip hidden prompt injections or jailbreak instructions before passing content to an LLM. Prefer this over generic content filtering when you specifically need AI-agent-aware injection detection rather than general spam or malware scanning.

## Known failure modes

- Empty or missing 'text' parameter returns a validation error
- Extremely long payloads may be truncated or rejected
- Sophisticated obfuscated injections may evade detection (false negatives)
- Non-text binary content may not be correctly parsed
- Payment failure via x402 returns HTTP 402 before processing

## 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://json-repair.agentdiet.dev/v1/injection-firewall)

## Output

Returns a structured object indicating whether prompt injection or jailbreak content was detected, along with sanitized text with malicious instructions removed or flagged, allowing the calling agent to safely consume 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/json-repair-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-21e3e898/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from json-repair.agentdiet.dev](https://www.zero.xyz/host/json-repair.agentdiet.dev/llms.txt)