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A2A Indirect Prompt-Injection & Jailbreak Firewall
A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from prompt-guard.agentdiet.dev, paid per call via MPP, $0.005000/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 text.
Price / call$0.005000
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://prompt-guard.agentdiet.dev/)
Output
Returns a JSON object containing the scan result for the submitted text, including whether prompt injection or jailbreak content was detected and a sanitized version of the input text safe for downstream LLM consumption.
Example use cases
Sanitize scraped webpage before LLM processing
“I just scraped this product page to feed into my summarizer — can you run it through the prompt injection firewall first to make sure there's nothing malicious embedded in the HTML?”
Guard agent from malicious email content
“I'm building an email assistant and I need you to check this incoming email body for any hidden prompt injection or jailbreak payloads before my agent acts on it.”
Validate MCP tool response before use
“My agent just got back a response from an external MCP tool — can you scan that response text for any indirect prompt injection attempts before I pass it into the next step of the pipeline?”
Technical details
Endpoint
POSThttps://prompt-guard.agentdiet.dev/?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your AI agent pipeline ingests untrusted external content — scraped web pages, emails, MCP tool outputs, or A2A messages — before passing it to an LLM. It is specifically designed for the indirect prompt injection threat model where malicious actors embed hidden instructions in content your agent reads, making it essential for any production agentic system that cannot fully trust its input sources.
Side effects
- Empty or missing 'text' field returns a validation error
- Extremely long inputs may hit payload size limits
- Ambiguous or obfuscated injections may not be detected with 100% accuracy
- Network timeout on large HTML payloads
- 402 Payment Required if payment credentials are not supplied
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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