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Kernel Stealth Headful Browser Session
browserstealthheadfulcdpautomationplaywright
Kernel Stealth Headful Browser Session is a paid API for AI agents from KERNEL at api.onkernel.com, paid per call via MPP, $0.5/call, status unknown (last checked 2026-10-11).
Provisions a stealth headful Chromium browser session accessible via CDP/WebDriver WebSocket, paid per-session using the Machine Payments Protocol (MPP) with no account required.
Price / call$0.5
Success—
StatusUnknown
How this service works
Buys a stealth headful browser for the duration in the offer with a Machine Payments Protocol (MPP) payment, without a Kernel account. A request without an `Authorization: Payment` credential gets a 402 challenge; the paid retry returns the browser and a `Payment-Receipt` header. A challenge can be paid until its `expires` time, 30 minutes after it is issued by default. A challenge buys one browser. Resending the same paid credential is intentional and safe: it returns the same browser without charging again until the session expires, even after the challenge has expired, so an agent can retry after a timeout. After the session expires it gets a 402 with a fresh challenge and `code: session_expired`. A different payment for a challenge that was already charged is rejected with a 402 before any charge.
Output
Returns a JSON object containing a unique session_id, a CDP WebSocket URL (cdp_ws_url) and a WebDriver WebSocket URL (webdriver_ws_url) for connecting automation frameworks like Playwright or Puppeteer, an optional browser_live_view_url for watching the session, stealth and headless boolean flags, session duration in minutes, created_at and expires_at timestamps, and a payment object with the Stripe PaymentIntent reference and amount charged. A Payment-Receipt header is also included in the HTTP response.
Example use cases
AI agent browsing the web autonomously
“Spin up a stealth headful browser session I can hook Playwright into so my agent can navigate websites, click around, and extract data without getting blocked by bot detection.”
One-off scraping job without infrastructure
“I need a temporary remote browser for about 30 minutes to scrape a site that blocks headless browsers — get me a CDP WebSocket URL I can connect to with Puppeteer, no account setup needed.”
Testing a web app in a live browser
“Can you provision a stealth Chromium browser session so I can run my end-to-end tests against it? I want a real headful browser with a live view URL so I can watch what's happening.”
Technical details
Endpoint
POSThttps://api.onkernel.com/mpp/browsers?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an AI agent or automated workflow needs a real, stealth-capable headful Chromium browser on demand without maintaining accounts, API keys, or browser infrastructure. It is ideal for tasks requiring bot-detection evasion, CDP-based automation (Playwright, Puppeteer), or one-off browsing jobs billed per session via crypto/USDC. Prefer it over self-hosted browsers when you want zero-infra setup, or over headless-only services when stealth and a live view are required.
Side effects
- No Authorization: Payment header → 402 challenge response with payment details and expiry (expected first step in MPP flow)
- Malformed email address in request body → 400 error before any challenge or charge
- Challenge already paid with a different payment credential → 402 rejection before any charge
- Session expired → 402 with fresh challenge and code: session_expired
- Challenge expired (>30 min) without payment → must restart the payment flow
- Network timeout on paid retry → resend same credential safely, returns same browser without re-charging
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| string | Optional address for the Stripe receipt. When omitted, the billing email shared with the payment token is used, if any. A malformed address is rejected with a 400 before any challenge or charge. |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| accessrequired | object | |
| paymentrequired | object | |
| stealthrequired | boolean | |
| headlessrequired | boolean | |
| cdp_ws_urlrequired | string | |
| created_atrequired | string | |
| expires_atrequired | string | |
| session_idrequired | string | |
| duration_minutesrequired | integer | |
| webdriver_ws_urlrequired | string | |
| browser_live_view_url | string |
Tags
browserstealthheadfulcdpautomationplaywrightwebcompute
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