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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 output.
Price / call$0.005
Success—
StatusUnknown
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/llm-guard)
Output
Returns a JSON object indicating whether prompt injection or jailbreak content was detected, along with sanitized text safe to pass to downstream LLMs or agent pipelines.
Example use cases
Sanitize scraped web content for agent pipeline
“I'm about to feed this scraped article HTML into my LLM summarizer — can you scan it for hidden prompt injections or jailbreak payloads first and give me the sanitized version?”
Guard agent inbox from adversarial emails
“Before my email-processing agent reads this incoming message, run it through the prompt-injection firewall to make sure there's nothing in there trying to override its instructions.”
Validate MCP tool response before acting
“My agent just got a response back from an external MCP tool — can you check it for any embedded jailbreak attempts or indirect prompt injections before I let the agent act on it?”
Technical details
Endpoint
GEThttps://shopify-spy.agentdiet.dev/v1/llm-guard?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your AI agent pipeline ingests untrusted external content — scraped web pages, emails, MCP/A2A tool responses, or user-submitted text — and you need a fast, per-call firewall check before passing that content to an LLM. Prefer this over general-purpose content filters when the specific threat model is indirect prompt injection or jailbreak hijacking of an AI agent.
Side effects
- Empty or whitespace-only text input returns a validation error
- Extremely long payloads may hit request size limits
- Obfuscated or encoded injections may evade detection
- Payment failure (x402) if USDC balance is insufficient
- Network timeout for very large HTML documents
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| textrequired | string | Untrusted text, HTML, or tool output to scan for hidden prompt injection or jailbreak payloads |
Output
Schema · Response
{
"type": "object"
}Reviews
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