# World Labs World API (Marble)

> World Labs' World API generates explorable 3D worlds (Gaussian splats, a collider mesh and a panorama) from text, images, panoramas or video with its Marble models, as asynchronous jobs at api.worldlabs.ai paid for with prepaid credits.

- Canonical: https://www.anchorterminal.com/tools/world-labs
- Pricing: https://www.anchorterminal.com/tools/world-labs#pricing
- Reviews: https://www.anchorterminal.com/tools/world-labs#reviews
- Markdown: https://www.anchorterminal.com/tools/world-labs.md (~7,050 tokens)
- Slim: https://www.anchorterminal.com/tools/world-labs.min.md (~1,780 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/tools/world-labs.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- MCP: https://www.anchorterminal.com/mcp (the whole catalogue as tools, no key)
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)
- Updated: 2026-10-28

## Overview

**Grade D · 50.1/100 · rank #930 of 1221 · #2 in 3D worlds · not agent-ready · confidence medium**


## Assessment

An OpenAPI 3.1 file, llms.txt and per-event credit prices make the World API straightforward to call, and a Marble 1.1 world from text costs $1.264. There is no free API tier, status page or webhook, inputs may train World Labs' models unless the user opts out, and AMD agreed in September 2026 to buy the company.

## Facts

| Field | Value |
| --- | --- |
| Vendor | World Labs Technologies, Inc. (https://www.worldlabs.ai) |
| Kind | HTTP API |
| Category | 3D worlds (https://www.anchorterminal.com/categories/3d-worlds) |
| Transport | HTTP |
| Endpoint | `https://api.worldlabs.ai/marble/v1` |
| Auth | API key · An API key in the `WLT-Api-Key` header, created on the API keys page of the World Labs Platform (platform.worldlabs.ai) after signing in with a Marble account, adding a payment method and buying credits. No scopes are documented. Rate limits apply per API user or account, not per key. Worlds are private by default (`permission.public` false). |
| Pricing | Pay per use ($1.264 / tx) · Prepaid credits at $1.00 per 1,250 credits, minimum purchase 6,250 credits ($5.00), bought on the World Labs Platform. A standard Marble 1.1 world from text is 1,580 credits ($1.264), from a panorama 1,500 ($1.20), a draft world 150 to 250 ($0.12 to $0.20). Marble 1.1 Plus adds 0 to 1,500 variable credits. HQ mesh export 3,500 credits ($2.80), PLY splat export free. Marble app credits and plans don't apply to the API. Requests that overdraw the balance are billed as overage the next month (https://docs.worldlabs.ai/api/pricing). |
| x402 | No · No x402, MPP or L402 in the API docs, pricing page or OpenAPI file. Low balance returns 402 Payment Required with a link to the billing page, not a payment challenge (checked 2026-10-28). |
| Licence | Proprietary service. The example and Python client repositories are MIT |
| Source | https://github.com/worldlabsai/worldlabs-api-python |
| Docs | https://docs.worldlabs.ai/api |
| llms.txt | https://docs.worldlabs.ai/llms.txt |
| Last release | 2026-04-02 |
| GitHub stars | 24 (as of 2026-10-28) |
| Surface listed | The World API (Marble Public API v1) at api.worldlabs.ai, read from the docs, llms.txt, the OpenAPI file, pricing, rate limits, errors and FAQ pages, the terms and privacy policy, and the two worldlabsai GitHub repositories on 28 October 2026. No account was made and no request sent to the API |
| Models | marble-1.1-plus, marble-1.1, marble-1.0 and marble-1.0-draft. Atlas is early access for select partners and not on the API |
| Inputs | Text, one image (pano detected automatically), several images with azimuths, or a video (mp4, mov, mkv). By public URL, an uploaded media asset (signed upload, up to 1 GB) or inline base64. Inline content up to 10 MB, URL content up to 20 MB per the OpenAPI file |
| Outputs | SPZ splats at 100k, 500k and full resolution (about 2M splats), metric scale and ground-plane metadata, a collider mesh GLB (100k to 200k triangles), a 2560 x 1280 panorama, a caption and a thumbnail. PLY splats (free) and an HQ mesh export as textured and vertex-coloured GLB (3,500 credits, up to an hour) |
| Job time | About 5 minutes per world, asynchronous. Results by polling an operation; no webhook found |
| Free tier | None on the API. The Marble app's Free plan (up to 4 world generations) is a separate account and gives no API credits |
| Rate limits | About 3 world-generation starts a minute and 60 an hour by default. Approved higher-throughput accounts about 30 a minute standard and 90 draft. HQ mesh generation 4 an hour per user |
| Enterprise | Higher throughput on request to support. Custom Marble plans through sales. Order Forms can set other terms |
| Output licence | Paid account and API users own outputs and may use them commercially. Free Marble accounts get a personal, non-commercial licence (terms of 21 January 2026) |
| Training on data | The terms grant World Labs a licence to use user content to train its models. Paid users can opt out, prospectively |
| SDKs and examples | No published SDK. worldlabsai/worldlabs-api-python (0.1.0, MIT, not on PyPI) and worldlabsai/worldlabs-api-examples (MIT), described as for experimentation, not production |
| Ownership | AMD signed a definitive agreement on 28 September 2026 to acquire World Labs, valued at about $8.2 billion in stock, expected to close by the end of 2026 |
| Capabilities | 3d.world-generate, 3d.reconstruct, 3d.export |
| Tags | official, hosted, closed-source, card-required, prepaid, async-jobs, openapi, llms-txt, commercial-licence, python |
| JSON | https://www.anchorterminal.com/api/v1/tools/world-labs.json |

## Score breakdown (methodology v0.7, October 2026 research run)

Assessed 2026-10-28 from public evidence against the published checklist (https://www.anchorterminal.com/benchmark/#checklist). Confidence: medium. Performance and Task success pending (no score, not in the total); the total is Σ(score × weight) ÷ 80 over the 7 assessed categories. "This run" is each category's share of the 100 points.

| Category | Weight | This run | Score (0–100) | Points |
| --- | --- | --- | --- | --- |
| Reliability | 16% | 20 | 45 | 9.0 |
| Performance | 10% | pending | pending | n/a |
| Schema & documentation | 13% | 16.2 | 79 | 12.8 |
| Agent ergonomics | 13% | 16.2 | 70 | 11.4 |
| Security & auth | 14% | 17.5 | 48 | 8.4 |
| Payments & pricing | 10% | 12.5 | 20 | 2.5 |
| Task success | 10% | pending | pending | n/a |
| Maintenance & community | 7% | 8.8 | 10 | 0.9 |
| Transparency & trust (editorial 40, provenance 76) | 7% | 8.8 | 58 | 5.1 |
| Negative events | up to −15 | up to −15 | none recorded | 0 |
| **Total** | | | | **50.1 → D** |

### Why each score

- Reliability 45 (checked 2026-10-28): Hosted API reading. No status page found, and status.worldlabs.ai doesn't resolve (0). No readable incident history (5). Rate limits published with numbers, about 3 world-generation starts a minute and 60 an hour by default, about 30 and 90 a minute for approved accounts (15). The 429 guidance says to wait for Retry-After when present, back off with jitter, and poll an accepted operation rather than resubmit; no idempotency key (15). No SLA found, and the terms disclaim warranties, describing the service as is (0). Launched publicly on 21 January 2026 and not labelled beta or preview (10).
- Performance: Pending. Latency is measured per call by our probes, which haven't run yet, so this run doesn't score it. Its weight is shared across the assessed categories until the first probe window closes.
- Schema & documentation 79 (checked 2026-10-28): A public OpenAPI 3.1 file covering all ten operations (25). llms.txt and a Markdown copy of every docs page (10). Operation descriptions state what each call does, what it returns and its errors, and the guides explain input types, pano detection and the two-step billing, with little on when not to use a call (13). Typed request bodies with a discriminated `world_prompt`, enums for export type and format, a seed range and documented limits such as 64-character names and 10 tags (13). curl, JavaScript and Python examples for every input type, an errors page with a status table and the 422 shape, though operation error codes aren't listed (13). Versioned paths (/marble/v1) and a model-name deprecation note, but no API changelog; the Marble release notes stop at 2 April 2026 (5).
- Agent ergonomics 70 (checked 2026-10-28): World responses are compact JSON with asset URLs, and splats come at 100k, 500k and full resolution so an agent can pick the size it downloads (18). `worlds:list` takes page_size, a cursor, and filters for status, model, tags, visibility and creation time, with sort order (20). Errors carry a `detail` string or per-field paths, 402 links to billing and failed operations carry a code and message, but some 400s come back as a bare Bad request (16). No idempotency key. A 429 start is documented as not accepted, and a repeated mesh export returns the cached result or the running operation at no cost (8). One required field, but the default model is the legacy marble-1.0, results are polled with no webhook, and there is no published SDK, only a Python client in a GitHub repository (8).
- Security & auth 48 (checked 2026-10-28): One kind of API key in the `WLT-Api-Key` header, created on the platform's API keys page, with more than one key per account. No scopes found, and revocation and rotation aren't described in the public docs (20). Worlds are private by default (`public` and `allow_id_access` false), but there is no read-only key, and DELETE removes a world and its assets permanently (5). Returns generated assets and an AI caption, not third-party text (10). A usage page lists usage events per request, and responses carry a request_id for support, with no audit log found (8). A responsible disclosure page with security@worldlabs.ai and a good-faith safe harbour, no bug bounty, no security.txt (404) and no SOC 2 or ISO 27001 found (5).
- Payments & pricing 20 (checked 2026-10-28): No x402, MPP or L402 (0). Credit costs per usage event are published without a login at $1.00 per 1,250 credits, $1.264 for a Marble 1.1 world from text (20). No free API tier. The Marble app's Free plan is a separate account, and API use needs a card and a $5 minimum purchase (0). A person signs in, adds a payment method, buys credits and creates the key in a browser (0).
- Task success: Pending. Task success needs the category task suites run through each tool, which haven't run yet, so this run doesn't score it. Its weight is shared across the assessed categories until then. A data provider's data-quality score is published on its listing now and becomes half of this category when it's scored.
- Maintenance & community 10 (checked 2026-10-28): Closed-service reading. The last dated change found is the 2 April 2026 release note adding Marble 1.1 and 1.1 Plus, 209 days ago. Atlas (1 September 2026) is early access only and not on the API, and the API docs carry no dates (0). No three dated changes in the last 90 days (0). The Marble release notes are stale for the API, and support runs through a Discord help channel and support@worldlabs.ai; we didn't test whether either answers (7). The only client is worldlabs-api-python 0.1.0, unpublished on PyPI and last changed on 20 January 2026 (3). No CI configured in either worldlabsai repository (0).
- Transparency & trust 58 (checked 2026-10-28): Closed service with clear terms of 21 January 2026, including output ownership and commercial use for paid and API users (15). The terms let World Labs use user content to train its models, with a prospective opt-out for paid users, and the privacy policy says training data may be kept longer. Retention is stated only as long as needed, two privacy policies with different dates are published (12 August and 12 November 2025), and the terms say API credits expire after a year while the pricing page says they don't (10). Model-name deprecation and a default-model change are announced without dates (5). A dated subprocessor list of seven vendors (12 November 2025), with no data locations (10).

Fix list for a coding agent, everything this grade says the listing lacks, the biggest gain first (15 items): https://www.anchorterminal.com/fixes/world-labs.md (JSON https://www.anchorterminal.com/fixes/world-labs.json)

### What we couldn't check

- What happens to the World API, its prices and its terms after AMD's acquisition closes. Nothing was found on this
- Whether failed or moderated generations are charged. The pricing page doesn't say
- Whether API keys can be revoked or rotated from the platform. The platform pages render only with JavaScript and the docs don't describe it
- unchecked: whether the Discord help channel or support@worldlabs.ai answers, which wasn't tested
- The default export coordinate system. The export specs say OpenCV, the release note of 11 December 2025 says OpenGL

### Sources

- API quickstart: <https://docs.worldlabs.ai/api> (seen 2026-10-28)
- llms.txt: <https://docs.worldlabs.ai/llms.txt> (seen 2026-10-28)
- OpenAPI file: <https://docs.worldlabs.ai/api/reference/openapi.yaml> (seen 2026-10-28)
- API pricing and overage: <https://docs.worldlabs.ai/api/pricing> (seen 2026-10-28)
- rate limits and 429 handling: <https://docs.worldlabs.ai/api/rate-limits> (seen 2026-10-28)
- errors and troubleshooting: <https://docs.worldlabs.ai/api/errors> (seen 2026-10-28)
- API FAQ: <https://docs.worldlabs.ai/api/faq> (seen 2026-10-28)
- API models: <https://docs.worldlabs.ai/api/models> (seen 2026-10-28)
- export file specs: <https://docs.worldlabs.ai/marble/export/specs> (seen 2026-10-28)
- Marble release notes: <https://docs.worldlabs.ai/marble/release-notes> (seen 2026-10-28)
- Marble subscriptions and billing: <https://docs.worldlabs.ai/marble/support/account-billing> (seen 2026-10-28)
- World API launch post, 21 January 2026: <https://www.worldlabs.ai/blog/announcing-the-world-api> (seen 2026-10-28)
- Atlas announcement, early access: <https://www.worldlabs.ai/blog/atlas> (seen 2026-10-28)
- terms of service, 21 January 2026: <https://www.worldlabs.ai/terms-of-service> (seen 2026-10-28)
- privacy policy, 12 November 2025: <https://www.worldlabs.ai/privacy-policy> (seen 2026-10-28)
- privacy policy on the docs site, 12 August 2025: <https://docs.worldlabs.ai/privacy-policy> (seen 2026-10-28)
- subprocessors: <https://www.worldlabs.ai/subprocessors> (seen 2026-10-28)
- security and responsible disclosure: <https://www.worldlabs.ai/security> (seen 2026-10-28)
- Python client repository: <https://github.com/worldlabsai/worldlabs-api-python> (seen 2026-10-28)
- API examples repository: <https://github.com/worldlabsai/worldlabs-api-examples> (seen 2026-10-28)
- World Labs post on joining AMD: <https://www.worldlabs.ai/blog/amd-announcement> (seen 2026-10-28)
- AMD press release on the acquisition: <https://ir.amd.com/news-events/press-releases/detail/1299/amd-to-acquire-world-labs-to-advance-the-future-of-ai-compute> (seen 2026-10-28)

## Score history

Every move of a score since the listing was graded, newest first, with its cause. A score can't move without an entry here. JSON: https://www.anchorterminal.com/api/v1/tools/world-labs/history.json

- 2026-10-28: graded 50.1 D (methodology 0.7)

## Who's behind it (provenance 76/100, checked 2026-10-28)

| Check | Finding | Points |
| --- | --- | --- |
| Legal entity named | World Labs Technologies, Inc. | 20/20 |
| Domain age | worldlabs.ai, registered 2023-11-22 (2 years) | 7/15 |
| Endpoint on the vendor's domain | api.worldlabs.ai | 15/15 |
| Terms of service | published | 10/10 |
| Privacy policy | published | 10/10 |
| Status page | not found | 0/10 |
| Changelog | published | 10/10 |
| security.txt | not found | 0/10 |
| People named | 4 named with their role, 4 with a public profile | 10/10 |
| Support route | a support address, help pages, a community | 5/5 |

Legal entity and address (640 2nd Street, San Francisco, CA 94107) from the terms of service, last updated 21 January 2026.

Two privacy policies are published. www.worldlabs.ai/privacy-policy is dated 12 November 2025, and docs.worldlabs.ai/privacy-policy, linked from the API FAQ, is dated 12 August 2025.

The changelog is the Marble app's release notes, last dated 2 April 2026. No API changelog was found.

No status page found. status.worldlabs.ai doesn't resolve.

https://www.worldlabs.ai/.well-known/security.txt returned 404. The security page gives security@worldlabs.ai for disclosure.

RDAP for worldlabs.ai gives a registration date of 2023-11-22.

### Terms and privacy, as read

A reading by a fixed set of rules, each answered with the vendor's own sentence. Not legal advice.

**Terms of service** (https://www.worldlabs.ai/terms-of-service), not read yet.


**Privacy policy** (https://www.worldlabs.ai/privacy-policy), not read yet.


## Humans behind the project (researched 2026-10-28 from public pages, not part of the grade)

### Key people

- Fei-Fei Li, Co-founder and CEO, World Labs. LinkedIn: https://www.linkedin.com/in/fei-fei-li-4541247/
- Justin Johnson, Co-founder, World Labs. LinkedIn: https://www.linkedin.com/in/justin-johnson-41b43664/
- Ben Mildenhall, Co-founder, World Labs. LinkedIn: https://www.linkedin.com/in/ben-mildenhall-86b4739b/
- Christoph Lassner, Co-founder, World Labs. LinkedIn: https://www.linkedin.com/in/christoph-lassner-475a669b/
- Note: the four founders are named on www.worldlabs.ai/about and in autodesk's investment post of 18 february 2026, which gives fei-fei li as ceo and links each founder's linkedin profile; the linkedin links come from that post. amd's release of 28 september 2026 calls fei-fei li co-founder and ceo. world labs' post on joining amd names fei-fei li, justin johnson and ben mildenhall as leading the team after the deal and doesn't mention christoph lassner, whose current role wasn't established. no personal x or github accounts are linked from world labs' pages. the rest of the leadership may be missing.
- World Labs Technologies, Inc.: X https://x.com/theworldlabs GitHub https://github.com/worldlabsai

### Ownership and investors

- Valuation: $8.2B, the price paid, AMD purchase agreement, closing by the end of 2026, September 2026 (source https://ir.amd.com/news-events/press-releases/detail/1299/amd-to-acquire-world-labs-to-advance-the-future-of-ai-compute)
- Backed by: Andreessen Horowitz, Radical Ventures, NEA, Marc Benioff, Ashton Kutcher, Adobe, AMD, Databricks, NVIDIA, Autodesk, Emerson Collective, Fidelity Management & Research Company, Sea, ADIC, Cisco, Intel, Salesforce, Samsung, Sanabil, Sound, Temasek, Zoom

### Getting support

- Discord: https://discord.gg/jSSSgXWT3v
- Support email: support@worldlabs.ai
- Help: https://docs.worldlabs.ai/marble/support/support-feedback
- Help: https://docs.worldlabs.ai/api/faq
- Help: https://docs.worldlabs.ai/api/errors
- Sources: https://www.worldlabs.ai/about, https://www.worldlabs.ai/blog, https://www.worldlabs.ai/blog/amd-announcement, https://www.worldlabs.ai/blog/funding-2026, https://www.worldlabs.ai/security, https://www.worldlabs.ai/terms-of-service, https://docs.worldlabs.ai/marble/support/support-feedback, https://docs.worldlabs.ai/api/rate-limits, https://docs.worldlabs.ai/api/examples, https://github.com/worldlabsai/worldlabs-api-python, https://adsknews.autodesk.com/en/news/autodesk-invests-in-world-labs/, https://ir.amd.com/news-events/press-releases/detail/1299/amd-to-acquire-world-labs-to-advance-the-future-of-ai-compute, https://www.foley.com/news/2024/09/foley-represents-nea-as-co-lead-investor-in-funding-for-ai-startup-world-labs/

## Live (updated 2026-10-28 06:09 UTC)

- Right now: up, HTTP 401, 419 ms, checked 2026-10-28 06:09 UTC (get on `https://api.worldlabs.ai/marble/v1`, asks for auth)
- Uptime 24h 100.0% (19 probes) · 30 days 100.0% (19 probes) · p50 423 ms · p95 545 ms
- Watching changelog <https://docs.worldlabs.ai/marble/release-notes>
- Watching pricing <https://docs.worldlabs.ai/api/pricing>
- Watching privacy <https://www.worldlabs.ai/privacy-policy>
- Watching terms <https://www.worldlabs.ai/terms-of-service>
- Always current: https://www.anchorterminal.com/api/v1/live/world-labs.json

## Probe metrics

Not measured yet. Our benchmark probes haven't run, so there's no availability, latency or error rate from a run and Performance is pending. Live uptime, where we poll the endpoint, is under Live and doesn't change the score.

## Prices

| Item | Price | Unit | Note |
| --- | --- | --- | --- |
| Marble 1.1 world from text | $1.264 | per transaction | 1,580 credits per world. 1,600 ($1.28) from multiple images or video, 1,500 ($1.20) from a panorama |
| Marble 1.1 Plus world from text | $1.264 | per transaction | 1,580 to 3,080 credits ($1.264 to $2.464) by world size. Observed median $1.264 to 25 June 2026 |
| Marble 1.0 Draft world from text | $0.184 | per transaction | 230 credits. 150 ($0.12) from a panorama |
| HQ mesh export | $2.80 | per transaction | 3,500 credits per world, both GLB variants. Cached exports are free. PLY splat export free |
| API credit | $0.0008 | per credit | $1.00 per 1,250 credits, minimum purchase $5.00 |

Across all listings: https://www.anchorterminal.com/prices/index.md

## Strengths

- Public OpenAPI 3.1 file and llms.txt, with a Markdown copy of every docs page
- Credit costs published per usage event at $1.00 per 1,250 credits, with observed Marble 1.1 Plus costs by percentile
- Text, image, multi-image, panorama and video inputs on one endpoint. Each world returns SPZ splats at three sizes, a collider GLB and a panorama
- The terms of 21 January 2026 give paid and API users ownership of outputs, including commercial use
- `worlds:list` filters by status, model, tags, visibility and creation time, with cursor pagination

## Weaknesses

- No free API tier. Credits need a card and a $5 minimum purchase, and Marble app plans and credits don't carry over
- No status page, SLA or webhook found. Jobs of about 5 minutes are polled
- The terms license user content for model training by default. Paid users can opt out, prospectively only
- No dated API changelog. The last dated release note is 2 April 2026, and the Python client is unpublished and unchanged since January 2026
- AMD signed a definitive agreement to acquire World Labs on 28 September 2026. No statement on the World API's future was found



## Before you call it (notes for agents)

1. Send `model` explicitly, such as `marble-1.1`. Omitting it selects the legacy `marble-1.0`, and that default is due to change
2. Poll GET /marble/v1/operations/{operation_id} until `done` is true. A world takes about 5 minutes, and a non-null `error` carries `code` and `message`
3. On 429, wait for Retry-After when present and back off with jitter. A start that returned an `operation_id` was accepted, so poll it rather than resend
4. Multiply splat coordinates by `semantics_metadata.metric_scale_factor` and subtract `ground_plane_offset` from Y before measuring anything
5. Check GET /marble/v1/credits before a batch. A request can overdraw the balance, and the overage is invoiced after the month ends

## Connect

First request:

```bash
curl -X POST 'https://api.worldlabs.ai/marble/v1/worlds:generate' \
  -H 'Content-Type: application/json' \
  -H "WLT-Api-Key: $WLT_API_KEY" \
  -d '{"display_name":"Mystical Forest","model":"marble-1.1","world_prompt":{"type":"text","text_prompt":"A mystical forest with glowing mushrooms"}}'
```

Through letme: https://letme.dev/world-labs (letme picks it for 3d.reconstruct, the top-graded tool for the job). letme answers with the pick and how to call it direct. How it works: https://www.anchorterminal.com/letme/index.md

## Similar tools

Ranked by shared capabilities, then score. Same-category tools with no shared capability key are listed last.

| Tool | Grade | Score | Rank | Shared capabilities | x402 | Markdown |
| --- | --- | --- | --- | --- | --- | --- |
| SpAItial API (Echo) | C | 56.7 | 731 | 3d.world-generate, 3d.export | no | https://www.anchorterminal.com/tools/spaitial.md |

## Panel reviews (0)

Reviewed by the Anchor panel (https://www.anchorterminal.com/reviewers/index.md): .

Desk reviews, written from public documentation, pricing, terms, source and status history on 1 October 2026. No calls made. For a desk review, the outcome says whether the reviewer's questions could be answered from public material: success, partial or failure. How reviews work: https://www.anchorterminal.com/reviews/how-it-works.md

## Notable

- World Labs launched the World API on 21 January 2026, two months after Marble opened to everyone on 12 November 2025 (source: <https://www.worldlabs.ai/blog/announcing-the-world-api>, <https://www.worldlabs.ai/blog/marble-world-model>)
- AMD announced a definitive agreement on 28 September 2026 to acquire World Labs in an all-stock transaction valued at about $8.2 billion, expected to close by the end of 2026 (source: <https://ir.amd.com/news-events/press-releases/detail/1299/amd-to-acquire-world-labs-to-advance-the-future-of-ai-compute>)
- Omitting `model` selects the legacy `marble-1.0`. The docs say the default will change to `marble-1.1` and the legacy names `Marble 0.1-plus` and `Marble 0.1-mini` will be removed, both without a date (source: <https://docs.worldlabs.ai/api/models>)
- Atlas, announced on 1 September 2026 as World Labs' new world model, is in early access with select partners and isn't on the World API (source: <https://www.worldlabs.ai/blog/atlas>)
- Requests are admitted against a low-balance threshold, not a per-request estimate, so a request can take the balance below zero. The overdraft is converted at the credit rate and charged after the monthly period, and auto-refill doesn't cap it (source: <https://docs.worldlabs.ai/api/pricing>)
- Each world returns `semantics_metadata` with a metric scale factor and ground-plane offset. Splats are in model units until scaled (source: <https://docs.worldlabs.ai/api/faq>)
- Third-party MCP servers for the World API exist (for example github.com/sandraschi/worldlabs-mcp). World Labs publishes none, and the official MCP registry has no World Labs entry (checked 2026-10-28)

- All 1 3d worlds comparisons: https://www.anchorterminal.com/compare/3d-worlds/index.md

## Compare

- [SpAItial API (Echo) vs World Labs World API (Marble)](https://www.anchorterminal.com/compare/spaitial-vs-world-labs.md): C 56.7 vs D 50.1

## Verify this listing

For the vendor. The badge or a plain link to this page verifies the listing, from a page on worldlabs.ai or one of its subdomains, or the README of github.com/worldlabsai/worldlabs-api-python. It shows the listing is the vendor's and that the vendor knows it's here, and it never changes a grade, rank or review. The vendor sends the page's address to `POST https://www.anchorterminal.com/api/v1/verify` as `{"slug": "world-labs", "url": "…"}`, or calls the `verify_listing` tool at https://www.anchorterminal.com/mcp. We fetch the page once, then again every week; two failed checks in a row and the verification lapses, and a later pass restores it. What we check: https://www.anchorterminal.com/builders/index.md#verify

HTML badge:

```html
<a href="https://www.anchorterminal.com/tools/world-labs"><img src="https://www.anchorterminal.com/badges/world-labs.svg" alt="World Labs World API (Marble) on Anchor Terminal" height="20"></a>
```

Markdown badge, for a README:

```markdown
[![World Labs World API (Marble) on Anchor Terminal](https://www.anchorterminal.com/badges/world-labs.svg)](https://www.anchorterminal.com/tools/world-labs)
```

Plain link:

```html
<a href="https://www.anchorterminal.com/tools/world-labs">World Labs World API (Marble) on Anchor Terminal</a>
```

## Share this listing

For the vendor. Sharing assets for social media, two PNGs of 1200 × 630 that say World Labs World API (Marble) is listed on Anchor Terminal, with the vendor's logo and this page's address and no grade or score.

- Dark: https://www.anchorterminal.com/assets/share/world-labs-dark.png
- Light: https://www.anchorterminal.com/assets/share/world-labs-light.png
- Create a video and download its frames: https://www.anchorterminal.com/assets/listing-video/index.html?listing=world-labs

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Query this catalogue directly over MCP: https://www.anchorterminal.com/mcp (Streamable HTTP, no key). How: https://www.anchorterminal.com/agents/#mcp
