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JSON body: {\"texts\": [\"...\" or {\"id\": \"...\", \"text\": \"...\"}], \"urls\": [\"https://...\"]}, 1 to 20 items in total. Price is $0.005 per item in USDC on Base via x402 (the 402 quotes the exact amount). Each result has verdict safe, suspicious or injection, a score and evidence spans; treat injection as do-not-forward. To read a web page safely in one call, POST /fetch-check with {\"urls\": [\"https://...\"]} (1 to 10): $0.005 per fetched URL, returns markdown, verdict, spans and safe_markdown; failed URLs are free. GET /selftest is free. MCP clients can use the streamable-http endpoint /mcp instead."},"paths":{"/check":{"post":{"summary":"Prompt-injection check (paid, x402)","description":"$0.005 USDC per item (text or URL), 1 to 20 items, x402 v2 exact on eip155:8453. Without payment the server answers 402 with the exact quote.","operationId":"checkPromptInjection","responses":{"200":{"description":"verdict per item","content":{"application/json":{"schema":{"type":"object","properties":{"results":{"type":"array","items":{"type":"object","properties":{"id":{"type":"string"},"verdict":{"type":"string","enum":["safe","suspicious","injection","error"]},"score":{"type":"number"},"intents":{"type":"array","items":{"type":"string"}},"human_summary":{"type":["string","null"],"description":"one fixed English sentence per intent, null when safe"},"spans":{"type":"array","items":{"type":"object","properties":{"start":{"type":["integer","null"]},"end":{"type":["integer","null"]},"start_byte":{"type":["integer","null"]},"end_byte":{"type":["integer","null"]},"start_utf16":{"type":["integer","null"]},"end_utf16":{"type":["integer","null"]},"intents":{"type":"array","items":{"type":"string"}},"types":{"type":"array","items":{"type":"string"}},"severity":{"type":"number"},"text":{"type":"string"},"offsets_in":{"type":"string","enum":["raw_html"]}}}},"signals":{"type":"array"},"sanitized_text":{"type":"string"}}}},"summary":{"type":"object"}}},"example":{"results":[{"id":"email-42","verdict":"injection","score":0.984,"intents":["override","secret_request"],"human_summary":"The text tries to replace or cancel the agent's instructions. 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Failed URLs (robots.txt, HTTP errors, timeouts, non-text) are free; a call where every URL fails is not charged. 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This is not a service; avoid relying on it for testing and monitoring purposes.","markdown_truncated":false,"fetch_truncated":false,"verdict":"safe","score":0.0,"intents":[],"human_summary":null,"spans":[],"hidden_html_parts":0,"safe_markdown":"This domain is for use in documentation examples without needing permission. This is not a service; avoid relying on it for testing and monitoring purposes.","charged":true}],"summary":{"urls":1,"ok":1,"failed":0,"charged_urls":1,"safe":1,"suspicious":0,"injection":0}}}}},"402":{"description":"Payment Required: x402 v2 challenge in the PAYMENT-REQUIRED header and the body"},"422":{"description":"invalid input, or no URL could be fetched; never charged"}},"x-payment-info":{"price":{"mode":"dynamic","currency":"USD","min":"0.005000","max":"0.050000"},"protocols":[{"x402":{"version":2,"scheme":"exact","network":"eip155:8453","asset":"USDC","pricePerItemUsd":"0.005","pricing":"amount = number of URLs fetched successfully x pricePerItemUsd"}}]}}},"/health":{"get":{"summary":"Health (free)","operationId":"health","responses":{"200":{"description":"Successful Response","content":{"application/json":{"schema":{}}}}},"tags":["Free"],"security":[]}},"/selftest":{"get":{"summary":"Known-answer self-test, 24 cases, hashed set (free)","operationId":"selftest","responses":{"200":{"description":"Successful Response","content":{"application/json":{"schema":{}}}}},"tags":["Free"],"security":[]}},"/.well-known/x402":{"get":{"summary":"x402 discovery document (free)","operationId":"x402Discovery","responses":{"200":{"description":"Successful Response","content":{"application/json":{"schema":{}}}}},"tags":["Free"],"security":[]}},"/.well-known/agent-card.json":{"get":{"summary":"A2A agent card (free)","operationId":"agentCard","responses":{"200":{"description":"Successful Response","content":{"application/json":{"schema":{}}}}},"tags":["Free"],"security":[]}},"/":{"get":{"summary":"Service info, JSON or HTML by Accept (free)","operationId":"info","responses":{"200":{"description":"Successful Response","content":{"application/json":{"schema":{}}}}},"tags":["Free"],"security":[]}},"/guide":{"get":{"summary":"Guide article, HTML (free)","operationId":"guide","responses":{"200":{"description":"Successful Response","content":{"application/json":{"schema":{}}}}},"tags":["Free"],"security":[]}},"/llms.txt":{"get":{"summary":"llms.txt summary for agents (free)","operationId":"llmsTxt","responses":{"200":{"description":"Successful Response","content":{"application/json":{"schema":{}}}}},"tags":["Free"],"security":[]}},"/stats":{"get":{"summary":"In-memory usage counters since process start, no caller data (free)","operationId":"stats","responses":{"200":{"description":"Successful Response","content":{"application/json":{"schema":{}}}}},"tags":["Free"],"security":[]}}},"externalDocs":{"url":"https://bitbucket.org/markedet/prompt-injection-check","description":"source and README"},"servers":[{"url":"https://prompt-injection-check.onrender.com"}],"x-mcp":{"url":"/mcp","transport":"streamable-http"}}