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A2A Indirect Prompt-Injection & Jailbreak Firewall
A2A Indirect Prompt-Injection & Jailbreak Firewall is a paid API for AI agents from onchain-risk.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://onchain-risk.agentdiet.dev/v1/system-prompt-guard)
Output
Returns a structured object indicating whether hidden prompt injections or jailbreak payloads were detected in the input text, along with sanitized version of the content safe for downstream LLM processing.
Example use cases
Guarding agent from poisoned web pages
“I'm about to feed this web page content to my AI agent — can you scan it first for any hidden prompt injections or adversarial instructions embedded in the HTML?”
Sanitizing email before LLM summarization
“Before you summarize this email for me, run it through the prompt injection firewall to make sure it doesn't contain any hidden instructions trying to hijack your behavior.”
Validating MCP tool response safety
“My agent just got back a response from an external MCP tool — can you check it for embedded jailbreak payloads or indirect prompt injections before I let my pipeline act on it?”
Technical details
Endpoint
GEThttps://onchain-risk.agentdiet.dev/v1/system-prompt-guard?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your AI agent pipeline ingests untrusted external content — web pages, emails, tool outputs, or agent-to-agent messages — and you need to detect or sanitize hidden prompt injections before passing content to an LLM. Especially valuable for agentic workflows where indirect prompt injection is a real attack surface.
Side effects
- Empty or missing 'text' parameter returns a validation error
- Extremely large payloads may time out or be truncated
- Novel or highly obfuscated injection techniques may evade detection
- Payment failure (HTTP 402) if x402 USDC balance is insufficient
- Non-text binary content may not be parseable
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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