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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, $0.005/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://prompt-guard.agentdiet.dev/v1/injection-firewall)
Output
Returns a JSON object containing the sanitized version of the input text with any detected prompt injection or jailbreak payloads removed or flagged, along with detection metadata indicating whether threats were found.
Example use cases
Sanitizing scraped web content for an agent
“I scraped this article from an untrusted site before passing it to my summarizer agent — can you scan it for any hidden prompt injections first? Here's the raw HTML text.”
Screening MCP tool responses in a pipeline
“My agent just got back a response from an external MCP tool and I want to make sure it doesn't contain any embedded adversarial instructions before I let the agent act on it — can you run the firewall check on this payload?”
Checking inbound emails for jailbreak attempts
“We're piping customer emails into an AI support agent and I'm worried about prompt injection attacks hidden in the email body — scan this email text and let me know if there's anything malicious before it reaches the agent.”
Technical details
Endpoint
GEThttps://prompt-guard.agentdiet.dev/v1/injection-firewall?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your AI agent pipeline ingests content from untrusted external sources — web pages, emails, MCP tool responses, or A2A payloads — and you need a dedicated firewall step before that content influences agent behavior. Prefer this over generic content filtering when your threat model specifically includes indirect prompt injection and jailbreak attempts targeting LLM-based agents.
Side effects
- Empty or missing 'text' parameter returns a validation error
- Extremely long input text may hit size limits or time out
- Ambiguous or subtly obfuscated injections may evade detection
- Payment required (HTTP 402) if x402 micropayment header is missing or invalid
- Service unavailability returns a non-200 status with no sanitized output
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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