{"uid":"cap_7zeMSezuCm6Jgh86a2LlZ","slug":"onchain-risk-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-53e55cb8","name":"A2A Indirect Prompt-Injection & Jailbreak Firewall","description":"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)","url":"https://onchain-risk.agentdiet.dev/v1/system-prompt-guard?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","required":["text"],"properties":{"text":{"type":"string","minLength":1,"description":"Untrusted text, HTML, or tool output to scan for hidden prompt injection or jailbreak payloads"}}},"responseSchema":{"type":"object"},"example":null,"exampleRequest":null,"tags":[],"displayCostAmount":"0.005","displayCostAsset":"USD","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.005/call","primary":{"kind":"static","protocol":"mpp","network":"tempo","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"mpp","network":"tempo","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_w5hVtAFg8KZ9fUq0n9xEy","protocol":"mpp","methodType":"crypto","chain":"tempo","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":"onchain-risk.agentdiet.dev","brandSlug":"onchain-risk-agentdiet-dev-mpp","brandBaseUrl":"https://onchain-risk.agentdiet.dev","brandDocsUrl":null,"whatItDoes":"Scans untrusted text, HTML, emails, MCP responses, or A2A payloads for hidden prompt injections and jailbreak attempts, returning sanitized output.","exampleAgentPrompt":"Before my agent processes this scraped web page, check it for any hidden prompt injections or jailbreak payloads: '<html>...page content...</html>'","exampleUseCases":[{"title":"Guarding agent from poisoned web pages","prompt":"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?"},{"title":"Sanitizing email before LLM summarization","prompt":"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."},{"title":"Validating MCP tool response safety","prompt":"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?"}],"resultDescription":"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.","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-21T07:25:58.412Z","isFirstParty":false,"canonicalSlug":"onchain-risk-agentdiet-dev-a2a-indirect-prompt-injection-jailbreak-cf120aa3"}