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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 2026-10-21).
Scans untrusted text, HTML, emails, MCP responses, or A2A payloads for hidden prompt injections and jailbreak attempts, returning sanitized content.
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/guard)
Output
Returns a structured object indicating whether prompt injection or jailbreak content was detected in the input text, along with sanitized/cleaned version of the text safe for downstream LLM consumption.
Example use cases
Guarding agent from malicious web pages
“I'm about to feed this scraped webpage into my AI pipeline — can you first scan it for any hidden prompt injection attacks or jailbreak instructions buried in the HTML?”
Sanitizing MCP tool responses
“Before my agent acts on this MCP tool response, run it through the prompt-injection firewall to make sure there are no adversarial instructions hidden inside it.”
Screening inbound emails for AI hijacking
“This email is going to be summarized by my AI agent — can you check it first for any indirect prompt injections or jailbreak payloads that might try to take over the agent's behavior?”
Technical details
Endpoint
GEThttps://hn-pulse.agentdiet.dev/v1/guard?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your AI agent is about to process content from untrusted external sources — scraped web pages, emails, third-party API responses, MCP tool outputs, or A2A payloads — and you need to detect and strip hidden prompt injection or jailbreak instructions before they reach your LLM. Prefer this over generic content filters when you specifically need adversarial-prompt detection in agentic pipelines.
Side effects
- Empty or missing 'text' parameter returns a 400 validation error
- Extremely long text inputs may be truncated or rejected
- Payment required (HTTP 402) if USDC micropayment via x402 is not provided
- False negatives possible for novel or obfuscated injection techniques
- Non-UTF8 or binary content may cause parsing errors
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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