# A2A Indirect Prompt-Injection & Jailbreak Firewall

> A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from defi-yield.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-injection and jailbreak attacks, returning sanitized output.

## Facts

- Endpoint: GET https://defi-yield.agentdiet.dev/v1/rag-poison-shield?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: defi-yield.agentdiet.dev
- Website: https://defi-yield.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/defi-yield-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-5076ff8e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_32Upcg6TD9HEeFGb-xUVz

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 defi-yield-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-5076ff8e
```

Example prompt: Before I pass this scraped webpage content into our RAG pipeline, scan it for any hidden prompt injections or jailbreak payloads and give me the sanitized version: [paste untrusted text here].

## When to prefer this

Choose this endpoint when your AI agent pipeline ingests content from untrusted external sources — web scraping, emails, third-party MCP tool responses, or user-submitted text — and you need a dedicated firewall layer to catch indirect prompt-injection and jailbreak attempts before that content reaches your LLM. Prefer this over generic content moderation APIs when the threat model is specifically adversarial AI manipulation rather than hate speech or NSFW content.

## Known failure modes

- Empty or missing 'text' parameter returns a validation error
- Extremely long inputs may be truncated or rejected
- Highly obfuscated injections using novel encodings may evade detection
- Payment failure (HTTP 402) if x402 USDC micropayment is not completed
- Network timeout for very large HTML payloads
- False positives on legitimate instructional text that resembles injection syntax

## 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://defi-yield.agentdiet.dev/v1/rag-poison-shield)

## Output

Returns a JSON object containing the sanitized version of the input text with any detected prompt-injection or jailbreak payloads removed or neutralized, along with detection signals indicating whether malicious content 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/defi-yield-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-5076ff8e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from defi-yield.agentdiet.dev](https://www.zero.xyz/host/defi-yield.agentdiet.dev/llms.txt)