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A2A Indirect Prompt-Injection & Jailbreak Firewall
A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from hn-pulse.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.
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://hn-pulse.agentdiet.dev/v1/llm-guard)
Output
Returns a JSON object containing the scan result, which includes whether a prompt injection or jailbreak payload was detected and a sanitized version of the input text safe for downstream LLM consumption.
Example use cases
Securing scraped web content for agents
“I just scraped this blog post to feed into my research agent, but I'm worried it might have hidden prompt injections embedded in the HTML — can you scan it and give me the sanitized text before I pass it along?”
Guarding agent email processing pipeline
“My agent is about to read and act on these customer emails, but some of them look suspicious. Can you check each email body for hidden jailbreak payloads or injected instructions before the agent processes them?”
Validating MCP tool response before use
“My agent just got back a response from an external MCP tool I don't fully trust — can you run that response through the prompt-injection firewall to make sure there's nothing malicious hidden in it before I let my agent act on it?”
Technical details
Endpoint
POSThttps://hn-pulse.agentdiet.dev/v1/llm-guard?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your agent pipeline ingests content from untrusted external sources — scraped web pages, third-party API responses, emails, MCP tool outputs, or A2A payloads — and you need to detect and neutralize hidden prompt injections or jailbreak attempts before they reach your LLM. Prefer this over generic content filters when you specifically need protection against adversarial AI-targeting attacks rather than general toxicity or spam filtering.
Side effects
- Empty or missing 'text' field returns a validation error
- Extremely large payloads may time out or be rejected
- Payment failure (HTTP 402) if x402 USDC payment is not attached or insufficient
- Malformed JSON body returns a 400 error
- Ambiguous or borderline injections may produce false negatives
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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