Google Flow API examples (useapi.net)

Runnable Node.js and Python examples for the Google Flow API by useapi.net — generate Veo 3.1 video, Gemini Omni Flash audio-native video, and Nano Banana 2 Lite / Nano Banana 2.1 / Nano Banana Pro images through a simple REST API that drives your own Google Flow subscription (no Google Cloud project, API key, or per-call metering).

Each example ships JavaScript and Python implementations (.mjs and .py) driven by a prompts.json you edit. Most are batch runners: they submit every prompt in the file and download every result, so you can queue a batch and come back to the winners. ugc-product-video/ is a pipeline instead — it chains six endpoints into one finished video, checkpointing as it goes.

| Example | What it does | Tutorial | Tutorial date | |---|---|---|---| | demo/ | Live agent chat app: a browser chat with Google Flow's creative agent through the API, with answers streamed live, the agent's images and videos inline (full-size view, download, reuse), uploads, characters and voices attached along the way, spending approvals, a Library and the agent's settings. Open the live demo or open demo/index.html locally. Vanilla JS, no build | Agent overview | October 16, 2026 | | veo-video/ | Batch-generate Veo 3.1 video — text-to-video, first/last-frame image-to-video | Generate Veo 3.1 video via curl | June 15, 2026 (October 5, 2026) | | images/ | Batch-generate images with Nano Banana 2 Lite (default), Nano Banana 2.1, Nano Banana Pro | Generate images via curl | June 15, 2026 (October 5, 2026) | | nano-banana-compare/ | Run one prompt through all three Nano Banana models (2 Lite, 2.1, Pro) and compare | Nano Banana 2 Lite vs 2.1 vs Pro compared | July 2, 2026 (October 5, 2026) | | omni-flash/ | Batch-generate Gemini Omni Flash audio-native video — text-to-video, first/last-frame image-to-video, reference-to-video, video-to-video edit | Generate Omni Flash video via curl | June 15, 2026 (October 5, 2026) | | ugc-product-video/ | Build a whole UGC product video — product sheets, a presenter, one still, an Omni 1.1 Flash clip per product, upscaled and joined | Make a UGC product video | September 4, 2026 | | n8n/ | Ready-to-import n8n workflow: a form that generates Veo 3.1 video or Nano Banana Pro images and returns the files | n8n template #19991 | September 28, 2026 | | n8n/ugc-ad-factory.json | Ready-to-import n8n form workflow that builds a whole UGC video ad with Omni 1.1 Flash: pick or re-roll at every step, upload your own product photos, 1–5 products, 1080p | Make UGC video ads in n8n | October 3, 2026 | | skills/omni-flash-video/ | Agent skill for Claude Code, Codex and Cursor: ask for a clip and the agent makes it with Omni 1.1 Flash or Veo 3.1 (dialogue, voices, reference images, first/last frames) and downloads the .mp4. Install: npx skills add useapi/google-flow-api --skill omni-flash-video | SKILL.md |

Quick start

You need Node.js v21 or newer or Python 3.x (neither has any dependencies to install), a useapi.net API token, and a connected Google Flow account (one $15/month subscription covers every useapi.net API):

git clone https://github.com/useapi/google-flow-api.git
cd google-flow-api/veo-video
node ./google-flow.mjs <API_TOKEN> <EMAIL>
# or, equivalently, with Python:
python3 ./google-flow.py <API_TOKEN> <EMAIL>

Edit prompts.json in each folder to queue your own prompts. Every supported parameter is documented on the POST /videos and POST /images endpoint pages.

MCP server

useapi.net also runs a hosted Model Context Protocol server for Google Flow, so an AI assistant such as Claude Code, Cursor or VS Code Copilot can use it on your own account. It has 12 tools: chat with Google Flow Agent, attach images, a video, voices and characters, answer its requests to spend credits, manage chats, set the project's approval mode, instructions and default models, list the account's characters, voices, images and videos, and upload images. Nothing to install or run locally.

• Endpoint: https://api.useapi.net/v1/google-flow/mcp
• Transport: Streamable HTTP
• Authorization: your useapi.net API token in the Authorization: Bearer … header, and an account connected with the Google Flow setup
• Listed in the official MCP Registry as net.useapi/google-flow

Claude Code:

claude mcp add --transport http useapi-google-flow https://api.useapi.net/v1/google-flow/mcp --header "Authorization: Bearer YOUR_API_TOKEN"

Cursor, VS Code, Windsurf and the full tool list: Google Flow MCP server docs. useapi.net is a third-party API, not affiliated with Google.

Common questions

• Does Google Flow have an official API or API key? No. Flow is a web app only, and Google doesn't issue a Google Flow API key. Veo 3.1, Omni 1.1 Flash and Nano Banana are sold separately on the metered Gemini API (Omni since June 30, 2026, about $0.10 per second of 720p video). This API drives your own Flow account instead.
• So what do I use as the API key? A useapi.net API token. Then connect your own Google account once through the Google Flow setup: sign in with Google, with no cookies to copy and no Google Cloud project or Gemini API key. The only other key is a captcha provider's, which you add once the 300 free solves on your first account run out.
• Connecting an account by hand instead? The Google Account Setup scripts (Windows, macOS, Linux) open a clean, single-use Brave profile with device-bound sessions switched off, so the cookies you copy keep working.
• What does the Google Flow API cost? A flat $15/month to useapi.net, which covers 3 Google Flow accounts and every other useapi.net API, plus the Google AI plan you already have. Images work even on a free Google account, and video spends your plan's Flow credits. For an 8-second clip, the official Gemini API charges $0.80 for Veo 3.1 Fast, $3.20 for Veo 3.1 Quality, $0.40 for Veo 3.1 Lite and about $0.81 for Omni 1.1 Flash at 720p. Through Flow, the same clips cost about $0.40, $2.00, $0.20 and $0.24 in credits on the Pro plan, or $0.10, $1.00, $0.05 and $0.12 on the Ultra $99 plan (less on Ultra $199). A Nano Banana Pro image is $0.134 on the Gemini API and included in Flow. Captcha solves cost about $0.80–$3.00 per 1,000 through your own provider. See the pricing comparison.
• Is there a second Omni allowance? Yes: Google Vids, on the same Google AI plan, with its own monthly allowance separate from Flow credits and no captcha. Examples: useapi/google-vids-api.
• More answers: Google Flow API questions.

中文说明

这是 useapi.net 托管的 Google Flow API 示例代码（Node.js 与 Python）。通过 REST API 调用 Veo 3.1 视频、Omni Flash 带音频视频，以及 Nano Banana 2 Lite / Nano Banana 2.1 / Nano Banana Pro 图片生成。

• 使用你自己的 Google 账号和 Google AI 订阅，已支持新域名 flow.google.com。
• 无需 Google Cloud 项目或 Gemini API Key，无需自己部署服务或维护浏览器。
• 账号通过自动化浏览器流程绑定，登录 Google 即可，无需手动复制 Cookie。
• reCAPTCHA 由服务端自动处理（首个账号赠送 300 次免费打码，之后接入你自己的打码服务）。
• 价格：useapi.net 每月 15 美元（含 3 个 Google Flow 账号及所有其他 API），加上你已有的 Google AI 订阅。图片生成在免费 Google 账号上也可使用。

中文教程（Veo 3.1、Omni 1.1 Flash、Nano Banana Pro，含价格对比与示例）：如何通过 Google Flow API 调用 Veo 3.1、Omni 1.1 Flash 和 Nano Banana Pro。快速开始见上方 Quick start，完整文档：Google Flow API。

About useapi.net

useapi.net is an experimental REST API for AI services. The Google Flow API drives your own Google Flow / Google AI subscription, so you spend your plan's credits at consumer rates instead of metered developer-API pricing. See the model matrix and the pricing comparison on the API overview.

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License

The example code in this repository is released under the MIT License. It covers the example scripts only, not the useapi.net service or API.