Non-blocking variant of POST /v1/sessions. Returns a request_id
immediately and provisions the underlying browser pod in the
background. Poll GET /v1/sessions/async/{request_id}/status until
status becomes ready to obtain the resolved session_id,
cdp_url and live_view_url.
When true (default), skip profile validation for active identities and reuse the saved
browser profile. Set to false to validate the profile and re-authenticate if it is no
longer signed in. Pending identities still authenticate on first use.
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Defaults to `false`.","uniqueKey":"browser.profile.persist","typeLabel":"boolean"}},"uniqueKey":"browser.profile","typeLabel":"object"},"adblock":{"type":"object","description":"Configuration for ad-blocking.","properties":{"active":{"type":"boolean","description":"Enable or disable ad-blocking. Defaults to `true`.","uniqueKey":"browser.adblock.active","typeLabel":"boolean"}},"uniqueKey":"browser.adblock","typeLabel":"object"},"popup_blocker":{"type":"object","description":"Configuration for popup blocking.","properties":{"active":{"type":"boolean","description":"Blocks popups, including ads and CAPTCHA consent banners. Requires adblock to be active. Defaults to `true`.","uniqueKey":"browser.popup_blocker.active","typeLabel":"boolean"}},"uniqueKey":"browser.popup_blocker","typeLabel":"object"},"captcha_solver":{"type":"object","description":"Configuration for captcha-solving.","properties":{"active":{"type":"boolean","description":"Enable or disable captcha-solving. Requires proxy to be active. Defaults to `false`.","uniqueKey":"browser.captcha_solver.active","typeLabel":"boolean"}},"uniqueKey":"browser.captcha_solver","typeLabel":"object"},"headless":{"type":"object","description":"Configuration for headless mode.","properties":{"active":{"type":"boolean","description":"Whether browser should be headless or headful. Defaults to `false`.","uniqueKey":"browser.headless.active","typeLabel":"boolean"}},"uniqueKey":"browser.headless","typeLabel":"object"},"viewport":{"type":"object","description":"Configuration for the browser's viewport size.","properties":{"width":{"type":"integer","description":"Width of the viewport in pixels. Defaults to `1440`.","uniqueKey":"browser.viewport.width","typeLabel":"integer"},"height":{"type":"integer","description":"Height of the viewport in pixels. Defaults to `900`.","uniqueKey":"browser.viewport.height","typeLabel":"integer"}},"uniqueKey":"browser.viewport","typeLabel":"object"},"fullscreen":{"type":"object","description":"Configuration for fullscreen mode.","properties":{"active":{"type":"boolean","description":"Enable or disable fullscreen mode. When enabled, the browser will start in fullscreen mode. Defaults to `false`.","uniqueKey":"browser.fullscreen.active","typeLabel":"boolean"}},"uniqueKey":"browser.fullscreen","typeLabel":"object"},"pdf_viewer":{"type":"object","description":"Configuration for PDF viewer mode.","properties":{"active":{"type":"boolean","description":"Enable or disable PDF viewer mode. When disabled, the browser will download PDFs instead of viewing them. Defaults to `true`.","uniqueKey":"browser.pdf_viewer.active","typeLabel":"boolean"}},"uniqueKey":"browser.pdf_viewer","typeLabel":"object"},"p2p_download":{"type":"object","description":"Configuration for peer-to-peer download capture functionality.","properties":{"active":{"type":"boolean","description":"Enable or disable P2P downloads. When enabled, the browser will capture downloads for direct data extraction, instead of uploading them on Anchor's storage. Defaults to `false`.","uniqueKey":"browser.p2p_download.active","typeLabel":"boolean"}},"uniqueKey":"browser.p2p_download","typeLabel":"object"},"extensions":{"type":"array","description":"Array of extension IDs to load in the browser session. Extensions must be previously uploaded using the Extensions API.","items":{"type":"string","format":"uuid","uniqueKey":"browser.extensions.items.[INDEX]","typeLabel":"string\u003cuuid>"},"uniqueKey":"browser.extensions","typeLabel":"string\u003cuuid>[]"},"volume":{"type":"object","description":"Mount a persistent volume into the session. Files the browser downloads are written to the volume's `downloads/` folder and remain available after the session ends. Create volumes with the Volumes API.","required":["id"],"properties":{"id":{"type":"string","format":"uuid","description":"ID of a volume owned by your team (see `POST /v1/volumes`). The volume must be in the `ready` state.","isRequired":true,"uniqueKey":"browser.volume.id","typeLabel":"string\u003cuuid>"},"read_only":{"type":"boolean","description":"Mount the volume read-only. Downloads then stay local to the session instead of being written to the volume. Defaults to `false`.","uniqueKey":"browser.volume.read_only","typeLabel":"boolean"}},"uniqueKey":"browser.volume","typeLabel":"object"},"disable_web_security":{"type":"object","description":"Configuration for disabling web security features.","properties":{"active":{"type":"boolean","description":"Whether to disable web security features (CORS, same-origin policy, etc.). Allows accessing iframes and resources from different origins. Defaults to `false`.","uniqueKey":"browser.disable_web_security.active","typeLabel":"boolean"}},"uniqueKey":"browser.disable_web_security","typeLabel":"object"},"extra_stealth":{"type":"object","description":"Enables our dedicated patched Chromium build, designed to avoid bot detection and blocking. Works with Anchor Proxy enabled only.","properties":{"active":{"type":"boolean","description":"Enable or disable extra stealth mode.","uniqueKey":"browser.extra_stealth.active","typeLabel":"boolean"}},"uniqueKey":"browser.extra_stealth","typeLabel":"object"},"force_popups_as_tabs":{"type":"object","description":"Configuration for forcing popups to open as tabs instead of popup windows.","properties":{"active":{"type":"boolean","description":"Enable or disable forcing popups as tabs. Defaults to `false`.","uniqueKey":"browser.force_popups_as_tabs.active","typeLabel":"boolean"}},"uniqueKey":"browser.force_popups_as_tabs","typeLabel":"object"},"web_bot_auth":{"type":"object","description":"Configuration for Cloudflare Web Bot Auth HTTP message signing. Enables authentication with websites that require Cloudflare's web bot authentication.","properties":{"active":{"type":"boolean","description":"Enable or disable web bot auth. Defaults to `false`.","uniqueKey":"browser.web_bot_auth.active","typeLabel":"boolean"}},"uniqueKey":"browser.web_bot_auth","typeLabel":"object"},"disable_dialogs":{"type":"object","description":"Suppresses native browser dialogs (window.alert, window.confirm, window.prompt). Useful for automated workflows where dialogs would block execution.","properties":{"active":{"type":"boolean","description":"Enable or disable suppression of native browser dialogs. Defaults to `false`.","uniqueKey":"browser.disable_dialogs.active","typeLabel":"boolean"}},"uniqueKey":"browser.disable_dialogs","typeLabel":"object"},"tracing":{"type":"object","description":"Console and network tracing. Network logs keep query parameter names but omit values, cookies, and credential headers.","properties":{"active":{"type":"boolean","description":"Enable or disable tracing. Defaults to `true`.","uniqueKey":"browser.tracing.active","typeLabel":"boolean"},"snapshots":{"type":"boolean","description":"Store document HTML for the DOM tab. HTML is saved as-is and may include tokens or PII. Defaults to `false`.","uniqueKey":"browser.tracing.snapshots","typeLabel":"boolean"},"sources":{"type":"boolean","description":"Accepted for backward compatibility and ignored.","uniqueKey":"browser.tracing.sources","typeLabel":"boolean"}},"uniqueKey":"browser.tracing","typeLabel":"object"},"sensitive_data_mask":{"type":"object","description":"Automatically detects and masks sensitive data (passwords, emails, phone numbers, credit card fields, tokens) in web pages. Supports custom CSS selectors globally or per site, and custom regex patterns.","properties":{"active":{"type":"boolean","description":"Enable or disable sensitive data masking. 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Matched elements will be blurred.","uniqueKey":"browser.sensitive_data_mask.site_selectors","typeLabel":"object"},"custom_patterns":{"type":"array","items":{"type":"object","properties":{"regex":{"type":"string","description":"Regular expression pattern to match sensitive data.","uniqueKey":"browser.sensitive_data_mask.custom_patterns.items.[INDEX].regex","typeLabel":"string"},"mask":{"type":"string","description":"Replacement string for matched text. Defaults to `****`.","uniqueKey":"browser.sensitive_data_mask.custom_patterns.items.[INDEX].mask","typeLabel":"string"}},"uniqueKey":"browser.sensitive_data_mask.custom_patterns.items.[INDEX]","typeLabel":"object"},"description":"Custom regex patterns to detect and mask additional sensitive data types.","uniqueKey":"browser.sensitive_data_mask.custom_patterns","typeLabel":"object[]"}},"uniqueKey":"browser.sensitive_data_mask","typeLabel":"object"}},"uniqueKey":"browser","typeLabel":"object"},"integrations":{"type":"array","description":"Array of integrations to load in the browser session. Integrations must be previously created using the Integrations API.","items":{"type":"object","required":["id","type","configuration"],"properties":{"id":{"type":"string","format":"uuid","description":"Unique integration ID","example":"550e8400-e29b-41d4-a716-446655440000","isRequired":true,"uniqueKey":"integrations.items.[INDEX].id","typeLabel":"string\u003cuuid>"},"type":{"type":"string","enum":["1PASSWORD"],"description":"Integration type","isRequired":true,"uniqueKey":"integrations.items.[INDEX].type","typeLabel":"enum\u003cstring>"},"configuration":{"oneOf":[{"type":"object","required":["load_mode"],"properties":{"load_mode":{"type":"string","enum":["all"],"description":"Load all secrets from 1Password","isRequired":true,"uniqueKey":"integrations.items.[INDEX].configuration.oneOf.0.load_mode","typeLabel":"enum\u003cstring>"}},"isRequired":true,"uniqueKey":"integrations.items.[INDEX].configuration.oneOf.0","typeLabel":"object"},{"type":"object","required":["load_mode","secrets"],"properties":{"load_mode":{"type":"string","enum":["specific"],"description":"Load specific secrets from 1Password","isRequired":true,"uniqueKey":"integrations.items.[INDEX].configuration.oneOf.1.load_mode","typeLabel":"enum\u003cstring>"},"secrets":{"type":"array","items":{"type":"string","uniqueKey":"integrations.items.[INDEX].configuration.oneOf.1.secrets.items.[INDEX]","typeLabel":"string"},"minItems":1,"description":"Array of secret references to load","example":["op://vault/item/field"],"isRequired":true,"uniqueKey":"integrations.items.[INDEX].configuration.oneOf.1.secrets","typeLabel":"string[]"}},"isRequired":true,"uniqueKey":"integrations.items.[INDEX].configuration.oneOf.1","typeLabel":"object"}],"isRequired":true,"uniqueKey":"integrations.items.[INDEX].configuration","typeLabel":"object"}},"uniqueKey":"integrations.items.[INDEX]","typeLabel":"object"},"example":[{"id":"550e8400-e29b-41d4-a716-446655440000","type":"1PASSWORD","configuration":{"load_mode":"all"}}],"uniqueKey":"integrations","typeLabel":"object[]"},"identities":{"description":"Activates an authenticated session.\n","type":"array","items":{"type":"object","description":"Previously configured identity to be used for the authenticated session.","properties":{"id":{"type":"string","description":"The identity ID to use for the browser session.","uniqueKey":"identities.items.[INDEX].id","typeLabel":"string"}},"uniqueKey":"identities.items.[INDEX]","typeLabel":"object"},"example":[{"id":"123e4567-e89b-12d3-a456-426614174000"}],"uniqueKey":"identities","typeLabel":"object[]"},"identity_skip_validation":{"type":"boolean","default":true,"description":"When `true` (default), skip profile validation for active identities and reuse the saved\nbrowser profile. Set to `false` to validate the profile and re-authenticate if it is no\nlonger signed in. Pending identities still authenticate on first use.\n","uniqueKey":"identity_skip_validation","typeLabel":"boolean"},"identity_async_auth":{"type":"boolean","default":false,"description":"Run identity authentication in the background and return the session immediately.","uniqueKey":"identity_async_auth","typeLabel":"boolean"}},"uniqueKey":"","typeLabel":"object"},"examples":{"Example":{"title":"Example","value":{"session":{"initial_url":"\u003cstring>","tags":["production","scraping","customer-123"],"recording":{"active":true},"proxy":{"active":true,"type":"anchor_proxy","country_code":"us","region":"\u003cstring>","city":"\u003cstring>"},"timeout":{"max_duration":123,"idle_timeout":123},"live_view":{"read_only":true,"one_time_url":true},"x402":false,"domain_allowlist":["example.com","example.org"]},"browser":{"profile":{"name":"\u003cstring>","persist":true},"adblock":{"active":true},"popup_blocker":{"active":true},"captcha_solver":{"active":true},"headless":{"active":true},"viewport":{"width":123,"height":123},"fullscreen":{"active":true},"pdf_viewer":{"active":true},"p2p_download":{"active":true},"extensions":["3c90c3cc-0d44-4b50-8888-8dd25736052a"],"disable_web_security":{"active":true},"extra_stealth":{"active":true},"force_popups_as_tabs":{"active":true},"web_bot_auth":{"active":true},"disable_dialogs":{"active":true},"tracing":{"active":true,"snapshots":true,"sources":true},"sensitive_data_mask":{"active":true,"custom_selectors":["\u003cstring>"],"site_selectors":{},"custom_patterns":[{"regex":"\u003cstring>","mask":"\u003cstring>"}]}},"integrations":[{"id":"550e8400-e29b-41d4-a716-446655440000","type":"1PASSWORD","configuration":{"load_mode":"all"}}],"identities":[{"id":"123e4567-e89b-12d3-a456-426614174000"}],"identity_skip_validation":true,"identity_async_auth":false}}},"exampleType":"generated"}},"exampleType":"generated"},"responses":{"77f93cb8-9667-4db0-b464-b92b1fd74b31":{"description":"Async session creation accepted; poll the status endpoint to resolve.","content":{"application/json":{"schema":{"type":"object","properties":{"data":{"type":"object","required":["request_id","status","session_id"],"properties":{"request_id":{"type":"string","format":"uuid","description":"Identifier of the async request. Use it to poll\n`GET /v1/sessions/async/{request_id}/status` for the resolved\n`session_id`, `cdp_url` and `live_view_url` once the pod\ncomes up.\n","isRequired":true,"uniqueKey":"data.request_id","typeLabel":"string\u003cuuid>"},"status":{"type":"string","enum":["pending"],"description":"Always `pending` immediately after creation.","isRequired":true,"uniqueKey":"data.status","typeLabel":"enum\u003cstring>"},"session_id":{"type":"null","description":"Always `null` immediately after creation; resolved via the polling endpoint.","isRequired":true,"uniqueKey":"data.session_id","typeLabel":"null"}},"uniqueKey":"data","typeLabel":"object"}},"uniqueKey":"","typeLabel":"object"},"examples":{"Example":{"title":"Example","value":{"data":{"request_id":"3c90c3cc-0d44-4b50-8888-8dd25736052a","status":"pending","session_id":null}}}},"exampleType":"generated"}},"exampleType":"generated"},"6c184614-3332-44c9-bccc-b2ed2cef7b1e":{"description":"Invalid request parameters or configuration.","content":{"application/json":{"schema":{"type":"object","properties":{"error":{"type":"object","properties":{"code":{"type":"integer","uniqueKey":"error.code","typeLabel":"integer"},"message":{"type":"string","uniqueKey":"error.message","typeLabel":"string"}},"uniqueKey":"error","typeLabel":"object"}},"uniqueKey":"","typeLabel":"object"},"examples":{"Example":{"title":"Example","value":{"error":{"code":123,"message":"\u003cstring>"}}}},"exampleType":"generated"}},"exampleType":"generated"},"401e8611-6c0f-4e21-8fa8-6e32c7d63b68":{"description":"Payment Required - Insufficient credits.","content":{"application/json":{"schema":{"type":"object","properties":{"error":{"type":"object","properties":{"code":{"type":"integer","uniqueKey":"error.code","typeLabel":"integer"},"message":{"type":"string","uniqueKey":"error.message","typeLabel":"string"}},"uniqueKey":"error","typeLabel":"object"}},"uniqueKey":"","typeLabel":"object"},"examples":{"Example":{"title":"Example","value":{"error":{"code":123,"message":"\u003cstring>"}}}},"exampleType":"generated"}},"exampleType":"generated"},"3521c26f-a03d-4373-bf6d-7908c95f53c4":{"description":"Project cost limit reached.","content":{"application/json":{"schema":{"type":"object","properties":{"error":{"type":"object","properties":{"code":{"type":"integer","uniqueKey":"error.code","typeLabel":"integer"},"message":{"type":"string","uniqueKey":"error.message","typeLabel":"string"}},"uniqueKey":"error","typeLabel":"object"}},"uniqueKey":"","typeLabel":"object"},"examples":{"Example":{"title":"Example","value":{"error":{"code":123,"message":"\u003cstring>"}}}},"exampleType":"generated"}},"exampleType":"generated"},"2a585f00-3459-4c64-90bf-5e9dbf173487":{"description":"API key would exceed batch browser limit.","content":{"application/json":{"schema":{"type":"object","properties":{"error":{"type":"object","properties":{"code":{"type":"integer","uniqueKey":"error.code","typeLabel":"integer"},"message":{"type":"string","uniqueKey":"error.message","typeLabel":"string"}},"uniqueKey":"error","typeLabel":"object"}},"uniqueKey":"","typeLabel":"object"},"examples":{"Example":{"title":"Example","value":{"error":{"code":123,"message":"\u003cstring>"}}}},"exampleType":"generated"}},"exampleType":"generated"}},"security":{"77987bfb-d8b5-47cd-8d3b-b4ce8ade4074":{"api_key_header":{"type":"apiKey","in":"header","name":"anchor-api-key","description":"API key for your Anchor Browser account, sent as the `anchor-api-key` header on every\nrequest. Create one at [app.anchorbrowser.io](https://app.anchorbrowser.io) (API Access).\n","scopes":[],"schemeName":"api_key_header"}}},"servers":{"c43aa3a0-83dc-41ca-90c7-e31bdef62746":{"url":"https://api.anchorbrowser.io","description":"API server"}},"processedSecurityOptions":[{"schemes":[{"scheme":{"type":"apiKey","in":"header","name":"anchor-api-key","description":"API key for your Anchor Browser account, sent as the `anchor-api-key` header on every\nrequest. Create one at [app.anchorbrowser.io](https://app.anchorbrowser.io) (API Access).\n","scopes":[],"schemeName":"api_key_header"},"schema":{"title":"anchor-api-key","type":"string","description":"API key for your Anchor Browser account, sent as the `anchor-api-key` header on every\nrequest. Create one at [app.anchorbrowser.io](https://app.anchorbrowser.io) (API Access).\n","isRequired":true,"typeLabel":"string","deprecated":false},"schemeName":"api_key_header","name":"anchor-api-key"}],"title":"api_key_header"}]},"originalFileLocation":"openapi.yaml"},"subdomain":"anchor-b3ec2715","siteName":"Anchor Browser Docs","title":"Start Browser Session (async) - Anchor Browser Docs","navMaps":{"firstHrefInVersion":{"Latest - v1":{"href":"/api-reference/browser-sessions/start-browser-session-async","matchLevel":0}},"firstHrefInLanguage":{}},"lastModified":"2026-11-05T16:18:23.542Z","originalFileLocation":"api-reference/browser-sessions/start-browser-session-async.mdx"},"headHtml":"\u003cscript data-mint-head>(function(){var d=document.documentElement,p=null;if(!p){try{p=localStorage.getItem(\"isDarkMode\")}catch(e){}if(p==='true')p='dark';else if(p==='false')p='light';if(p!=='light'\u0026\u0026p!=='dark'\u0026\u0026p!=='system')p=\"system\"}var r=p==='system'?(matchMedia(\"(prefers-color-scheme: dark)\").matches?'dark':'light'):p;d.classList.remove(r==='dark'?'light':'dark');d.classList.add(r);d.setAttribute(\"data-theme-preference\",p)})();\u003c/script>\u003cmeta data-mint-head name=\"description\" content=\"Non-blocking variant of POST /v1/sessions. 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