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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/indirect-injection-guard)
Output
Returns a sanitized version of the submitted text with prompt injection and jailbreak payloads detected and flagged, along with a structured result object indicating whether malicious content was found and what was cleaned or neutralized.
Example use cases
Securing agent from malicious web content
“I just scraped this article from an untrusted website and want to pass the text to you for summarizing — but first, scan it for any hidden prompt injection instructions that might be embedded in the HTML or text trying to hijack your behavior.”
Screening inbound emails for AI agents
“Before my email-processing agent acts on this incoming message, check the full email body for any embedded jailbreak or indirect prompt injection payloads that could manipulate the agent's actions.”
Validating MCP tool response safety
“My agent just got back a response from a third-party MCP tool and I don't fully trust it — can you run the response text through the injection firewall to make sure there are no hidden instructions trying to override my agent's system prompt?”
Technical details
Endpoint
POSThttps://hn-pulse.agentdiet.dev/v1/indirect-injection-guard?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your AI agent is about to process text from untrusted external sources — scraped web pages, inbound emails, third-party API/tool responses, or A2A payloads — and you need to protect the agent from indirect prompt injection or jailbreak attacks before the content reaches the LLM context. It is especially valuable in autonomous agent pipelines where content from the open web or unknown tools is fed directly into an LLM without human review.
Side effects
- Empty or missing 'text' field returns a 400 validation error
- Extremely large payloads may time out or be rejected
- Legitimate content with instruction-like language (e.g. policy documents) may produce false positives
- Service unavailability returns 503
- Payment failure or insufficient balance returns 402 with x402 payment challenge
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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