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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 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/prompt-injection-shield)
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 AI processing.
Example use cases
Safe web scraping for agent pipeline
“I'm building an agent that reads news articles from the web. Before passing any scraped HTML to my summarizer model, scan it for hidden prompt injection instructions and return the clean text.”
Screening incoming emails before AI processing
“My AI assistant reads and categorizes my emails automatically. Can you run this email body through the prompt-injection firewall to make sure it doesn't contain any embedded instructions trying to hijack the agent?”
Validating MCP tool response before use
“I just got a response back from an external MCP tool and I want to make sure it's safe before my agent acts on it — scan the payload for any jailbreak or indirect prompt injection content.”
Technical details
Endpoint
GEThttps://hn-pulse.agentdiet.dev/v1/prompt-injection-shield?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your AI agent must process untrusted external content — such as scraped web pages, incoming emails, third-party API or MCP tool responses, or A2A payloads — and you need a dedicated firewall layer to detect and strip hidden prompt injections or jailbreak attempts before that content enters your LLM pipeline. Prefer this over generic content filters when you specifically need injection-aware scanning tailored to agentic and LLM attack vectors.
Side effects
- Empty or missing 'text' parameter returns a 400 validation error
- Extremely long text inputs may be truncated or rejected
- Payment not completed (HTTP 402) if x402 micropayment is not settled
- False negatives: sophisticated obfuscated injections may not be detected
- Service unavailability returns 5xx 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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