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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/paid)
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 LLM consumption.
Example use cases
Protecting agent from malicious scraped web content
“I'm about to have you summarize this article I scraped from the web — can you first scan the raw HTML through the prompt injection firewall to strip out any hidden instructions before you read it?”
Sanitizing untrusted MCP tool responses
“That MCP server I connected to is third-party and I don't fully trust it — can you run its last response through the prompt injection scanner before you act on any of its instructions?”
Screening inbound emails for jailbreak payloads
“Before my agent processes these customer emails and drafts replies, I need you to scan each email body for hidden prompt injections or jailbreak attempts and flag anything suspicious.”
Technical details
Endpoint
GEThttps://prompt-guard.agentdiet.dev/paid?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your AI agent is processing untrusted external content — scraped web pages, third-party API responses, MCP tool outputs, A2A payloads, or user-submitted emails — and you need to detect and strip hidden prompt injection or jailbreak instructions before passing the content to an LLM. Prefer this over general content moderation APIs when the threat model is specifically adversarial prompt manipulation targeting AI agents rather than harmful human-facing content.
Side effects
- Empty or missing 'text' parameter returns a 400 validation error
- Extremely long payloads may be truncated or rejected
- Payment not completed via x402 returns HTTP 402 requiring USDC micropayment
- False negatives possible for novel or obfuscated injection techniques
- Service downtime returns 5xx errors 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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