World API

What it does

World API takes text prompts, single images, multiple images of one scene, or video and returns an asynchronous Operation object that tracks the generation of a 3D world. Generated worlds can be exported as GLB meshes or PLY splats through the Export API. Developers poll the operation until the world is ready, then retrieve the finished world from the response.

Developers call the /marble/v1/worlds:generate endpoint with a model such as marble-1.1 or marble-1.1-plus, authenticating with an API key sent in a WLT-Api-Key header. Requests consume credits: panorama generation and world generation are metered separately, so one request often produces two usage events. Credits purchased for the Marble web app cannot be used with the API; API credits must be bought on the World Labs Platform.

This suits developers building 3D world generation into their own software who are comfortable with API-key authentication and metered billing. Access requires a World Labs Platform account, a payment method, and purchased credits. Overage charges for usage beyond prepaid credits are billed after each month ends, and auto-refill does not cap spending, so usage should be monitored closely.

What it can do

• Generate 3D worlds from a text prompt via the /marble/v1/worlds:generate endpoint.
• Generate worlds from a single image, multiple images of one scene, or a video.
• Choose between marble-1.1 (standard) and marble-1.1-plus (larger worlds) models.
• Export GLB meshes through the Export API.
• Export PLY splats through the Export API.
• Check credit balance and usage events, with optional auto-refill to top up low balances.

Example workflows

Text-to-world generation

Input: a text prompt and display name. Steps: POST to /marble/v1/worlds:generate with model marble-1.1 and a world_prompt of type text. Output: an Operation object with an operation_id to poll for completion.

Mesh export of a generated world

Input: a completed world. Steps: call the Export API with asset_type mesh and format glb. Output: a GLB mesh containing textured and vertex_colored variants, billed once per world at 3,500 credits.

Before you choose

• API credits come from the World Labs Platform and are separate from Marble app credits, which cannot be used with the API.
• Overage charges for usage beyond prepaid credits are billed after the month ends and are not capped by auto-refill being off.

Listed under

• Creative
• Image and design
• 3D
• 3D scenes
• API
• Developer API
• Developers
• Game development

Get started

Requires a Marble account, a payment method, purchased platform credits, and an API key.

1. Sign in to the World Labs Platform with a Marble account and add a payment method on the billing page.
2. Purchase credits on the World Labs Platform (minimum 6,250 credits or $5.00 USD) and optionally enable auto-refill.
3. Generate an API key on the API keys page, store it securely, and send it in the WLT-Api-Key header.

Prepaid credits at $1.00 per 1,250 credits, with overage billed monthly. Usage events cost 80 to 3,500 credits; see the pricing page for current rates.

Source: docs.worldlabs.ai/api/pricing, checked 29 Oct 2026. Prices can change; check before you buy.

Sources for this overview

Product pages, documentation, and pricing checked 29 Oct 2026. Each source supports part of the overview; availability and prices can change.

• Quickstart - World Labs ↗docs.worldlabs.ai
• Pricing - World Labs ↗docs.worldlabs.ai

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docs.worldlabs.ai: product, pricing and policy pages

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Last checked 29 Oct 2026. Every field keeps its source and date; unknown means we couldn’t confirm it.