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A2A Indirect Prompt-Injection & Jailbreak Firewall
A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from alpha-stream.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://alpha-stream.agentdiet.dev/v1/system-prompt-guard)
Output
Returns a structured object indicating whether prompt injection or jailbreak content was detected, along with sanitized text with malicious instructions removed or flagged, allowing safe downstream processing by an AI agent.
Example use cases
Screening scraped web content before agent processing
“I'm about to let my agent read and summarize this scraped blog post — can you first scan the raw HTML for any hidden prompt injections or jailbreak payloads so my agent doesn't get hijacked?”
Sanitizing inbound email before LLM summarization
“I have an email from an unknown sender that my agent is going to parse and act on — please run the email body through the prompt-injection firewall first to check for any malicious embedded instructions.”
Validating MCP tool response before pipeline execution
“My agent just got back a response from an external MCP tool and I want to make sure it's clean before passing it downstream — can you scan the tool output for any hidden prompt injections or jailbreak attempts?”
Technical details
Endpoint
GEThttps://alpha-stream.agentdiet.dev/v1/system-prompt-guard?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your AI agent is consuming content from untrusted external sources — scraped web pages, inbound emails, third-party MCP tool outputs, or A2A payloads — and you need a lightweight, real-time firewall to prevent indirect prompt injection attacks before that content reaches your agent's context window. Prefer this over generic content filters when the threat model specifically involves adversarial manipulation of agent behavior through hidden instructions.
Side effects
- Empty or missing 'text' parameter returns a validation error
- Extremely long text inputs may be truncated or rejected
- Novel or obfuscated injection techniques may evade detection
- Response schema is loosely typed (generic object), so output structure may vary
- Payment failure via x402 results in HTTP 402 before scan occurs
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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