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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 injection and jailbreak attacks, returning sanitized text.
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/mcp-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 malicious content was found.
Example use cases
Sanitize scraped web page before LLM processing
“I just scraped this article page and I want you to scan it for any hidden prompt injection or jailbreak payloads before you summarize it for me — here's the raw HTML.”
Validate MCP tool response safety
“Before you act on what that MCP server just returned, can you run the response through the injection firewall to make sure there are no adversarial instructions hiding in it?”
Screen inbound email for agent manipulation
“I have an email that came in from an unknown sender and I need to forward it to my AI assistant — please scan it first to detect any prompt injection tricks embedded in the body text.”
Technical details
Endpoint
GEThttps://hn-pulse.agentdiet.dev/v1/mcp-injection-firewall?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an AI agent needs to safely process untrusted external content — such as scraped web pages, inbound emails, MCP tool responses, or A2A payloads — before feeding that content into an LLM pipeline. It is especially valuable in agentic workflows where indirect prompt injection is a real attack vector and content provenance is unknown.
Side effects
- Empty or missing 'text' parameter returns a validation error
- Extremely long payloads may exceed processing limits or timeout
- Obfuscated or novel injection techniques may not be detected
- Payment failure via x402 results in 402 response blocking the scan
- Malformed HTML may cause partial sanitization
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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