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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 prompt injection or jailbreak content was detected in the input text, along with a sanitized version of the text with malicious instructions removed or flagged, so the agent can safely use the cleaned output.
Example use cases
Sanitizing scraped web content for agents
“I'm building an agent that browses the web and summarizes pages — before passing any scraped HTML to the LLM, scan it for hidden prompt injections and return the clean text so nothing malicious gets into my agent's context.”
Screening incoming emails for jailbreak attempts
“My AI agent reads and processes inbound emails automatically — can you check this email body for any hidden prompt injection or jailbreak instructions before the agent acts on it?”
Validating MCP tool output before agent use
“My agent just got a response back from an external MCP tool — before I feed that payload into the next step, run it through the prompt-injection firewall to make sure there's nothing adversarial hiding in there.”
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 consumes content from untrusted external sources — web scraping, email ingestion, third-party MCP/A2A tool responses, or user-submitted data — and you need a dedicated firewall layer to catch indirect prompt injections before they corrupt your agent's behavior. Particularly valuable in multi-agent pipelines where one compromised upstream payload could cascade through the entire system.
Side effects
- Empty or missing 'text' parameter returns a 400 validation error
- Very large payloads may exceed size limits or timeout
- False negatives possible for novel obfuscated injection techniques not yet in detection patterns
- Non-text binary content may not be parsed correctly
- Payment failure (HTTP 402) if x402 USDC balance is insufficient
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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