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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 injections and jailbreak attempts, returning sanitized content.
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/system-prompt-guard)
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 safe for downstream agent consumption.
Example use cases
Safe web scraping pipeline guard
“I'm about to feed this scraped HTML from an external site into my AI agent — can you scan it first for any hidden prompt injections or adversarial instructions before I let the agent process it?”
Email-based jailbreak detection
“I received this email that my agent is supposed to summarize — can you check the email body for any hidden jailbreak attempts or prompt injection tricks embedded in the text before the agent reads it?”
MCP tool output sanitization
“My agent just got back a response from an external MCP tool and I want to make sure it's safe — can you scan this tool output for any hidden instructions or prompt injection payloads before I pass it along in the pipeline?”
Technical details
Endpoint
GEThttps://hn-pulse.agentdiet.dev/v1/system-prompt-guard?utm_source=zero.xyzWhen to prefer
Use this endpoint when your AI agent pipeline ingests content from untrusted external sources — scraped web pages, user-submitted text, third-party API responses, emails, or MCP/A2A tool outputs — and you need a lightweight, per-call firewall check before that content reaches your LLM. Prefer this over manual filtering when you need automated, low-latency detection of indirect prompt injection and jailbreak payloads embedded in arbitrary text or HTML.
Side effects
- Empty or missing 'text' parameter returns a 400 validation error
- Extremely long text inputs may be truncated or rejected
- False negatives possible for novel or obfuscated injection techniques
- Rate limiting or payment failures (HTTP 402) if x402 USDC payment not resolved
- Non-text binary content may produce unreliable scan results
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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