# Higgsfield API vs sync. labs MCP server

> Higgsfield scores 62.7 (B) to sync. labs's 51.5 (D) for video edit. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/higgsfield-vs-sync-labs-mcp
- Markdown: https://www.anchorterminal.com/compare/higgsfield-vs-sync-labs-mcp.md (~4,750 tokens)
- Site index for agents: https://www.anchorterminal.com/llms.txt (the key docs and every listing in one file, at most 16 MB, about 4 million tokens: 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)
- DNS: dig +short TXT <slug>.grade.anchorterminal.com (the grade as a DNS TXT record, for a sandbox with no HTTP where names still resolve; also top., best.<category>. and <a>.vs.<b>. under the zone, and the same under grade.letme.dev)
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)
- Updated: 2026-11-07

Higgsfield API scores 62.7 (B) on agent readiness against sync. labs MCP server's 51.5 (D), and leads in 4 of 7 scored categories. sync. labs MCP server leads on schema & documentation, payments & pricing and maintenance & community. Both do video edit.

- Higgsfield API: grade B, 62.7/100, rank #542 of 1510. Markdown https://www.anchorterminal.com/tools/higgsfield.md · JSON https://www.anchorterminal.com/api/v1/tools/higgsfield.json
- sync. labs MCP server: grade D, 51.5/100, rank #1026 of 1510. Markdown https://www.anchorterminal.com/tools/sync-labs-mcp.md · JSON https://www.anchorterminal.com/api/v1/tools/sync-labs-mcp.json
- Best video generation for AI agents: https://www.anchorterminal.com/best/video-generation/index.md
- All 183 video comparisons: https://www.anchorterminal.com/compare/video-generation/index.md

## Which one, for what

### Higgsfield API (B)

Good for: An agent that wants several vendors' video models behind one key, one request lifecycle and safe retries, at published per-second prices.

Ahead on:
- Reliability, 80 against 43
- Agent ergonomics, 81 against 55
- Security & auth, 48 against 38
- Transparency & trust, 64 against 44

Watch for: API inputs and outputs can train Higgsfield's models by default. The opt-out is a workspace setting, processed within 10 business days

### sync. labs MCP server (D)

Good for: Agents that lip-sync or dub video into other languages.

Ahead on:
- Schema & documentation, 81 against 70
- Payments & pricing, 30 against 20
- Maintenance & community, 75 against 65

Also in its favour:
- Open source

Watch for: No read-only mode


## Why the edge

### Reliability: Higgsfield API +37

- Higgsfield API (80): Hosted reading. status.higgsfield.ai now shows Models API, Webhooks and Developer Console components with 90-day uptime bars (20). Its incident and maintenance feed is empty and its history pages redirect to the front page, so the page has never posted an incident, which this run reads at 20, not as a clean record (20 of 30). Concurrency limits are published with numbers, 2 for a new account and 10, 20 and 40 at $25, $100 and $1,000 of funds added in 28 days, and the queue limit is a stated multiple of concurrency (15). Since late October, requests over the concurrency limit are queued, and a full queue answers 429 with `Retry-After`, a `retryable` flag and `account_queue_full`. The docs give backoff with jitter, a retry table and idempotency keys for submissions (15). The API terms say self-serve customers get no uptime commitment and the docs offer SLAs only in an enterprise agreement, with none published (0). No beta or preview label on the API (10). 20 + 20 + 15 + 15 + 0 + 10 = 80.
- sync. labs MCP server (43): Status page at status.sync.so with maintenance and previous incidents (20). History not read (5). No MCP limits found (0). The source has abort-signal handling and recovery guidance for long jobs (8 of 15). No SLA found (0). Version 0.2.4, not labelled beta (10). 20 + 5 + 0 + 8 + 0 + 10 = 43.

### Agent ergonomics: Higgsfield API +26

- Higgsfield API (81): Submissions return a small JSON handle, results are URLs, and webhooks replace polling (20 of 25). Resolution, duration and aspect ratio set output size per model. No endpoint to list requests was found in the docs (10 of 20). The error page says which statuses to retry, and the limit now arrives as a 429 with `Retry-After`, `code`, `retryable` and `retry_after_seconds`, and expired or disabled keys as 403 with a `code`. Other errors are message strings the docs warn against parsing (16 of 20). `Idempotency-Key` on every generation endpoint, with a 422 on a reused key with different parameters, plus cancel for queued requests (20). Few required parameters, sensible defaults, and official Python and TypeScript SDKs (15). 20 + 10 + 16 + 20 + 15 = 81.
- sync. labs MCP server (55): A generated catalogue filtered by client profile, curated for ChatGPT (15). Project history and estimates (12 of 20). Recovery tools; errors not documented (8 of 20). Annotations not read (5 of 20). OAuth or a key, npm package and library use (15). 15 + 12 + 8 + 5 + 15 = 55.

### Transparency & trust: Higgsfield API +20

- Higgsfield API (64): Closed service with API terms dated 2 September 2026 that are specific on licence, resale and outputs. SDKs are MIT and Apache-2.0 (15). The API terms state training on inputs and outputs by default with a workspace opt-out, request records kept while the account is active, media kept at least seven days and zero retention only by enterprise addendum, and the privacy policy of 31 October 2026 agrees on training. The docs now let a request set its own retention down to one hour and delete a finished request, but the docs' opt-out page says it covers outputs only, against the terms' inputs and outputs. The DPA the terms incorporate was not found (20 of 30). The status page carries a dated notice that platform.higgsfield.ai stops serving the API by 31 October 2026, the terms promise efforts to announce model removals, and legacy endpoints are labelled, but there is no changelog (10 of 20). Partner models are named by vendor in the catalogue. The subprocessor list is said to sit in the trust centre, which was unread, and no data locations were found (5 of 20). 15 + 20 + 10 + 5 = 50.
- sync. labs MCP server (44): MIT open source (30). Data handling not read (5 of 30). No deprecation policy; earlier tool names documented as superseded (5 of 20). Subprocessors not found (0). 30 + 5 + 5 + 0 = 40.

### Schema & documentation: sync. labs MCP server +11

- Higgsfield API (70): `/docs/openapi.json` is public OpenAPI 3.1 but covers 9 paths, and llms.txt calls it supplementary. Each model page carries its own full JSON Schema (15 of 25). llms.txt, llms-full.txt and Markdown twins of every page (10). Model pages state the endpoint, usage notes and limits, with little on when to pick one model over another (14 of 20). Schemas have enums, length and item limits, required fields and `additionalProperties: false` (14 of 15). cURL, Python and TypeScript examples on each page and a status-code table. Most errors are still a FastAPI `detail` string, though queue, admission and key errors now carry a `code` (12 of 15). Endpoints carry a version segment, and no changelog was found in the docs or sitemap on 2 November (5 of 15). 15 + 10 + 14 + 14 + 12 + 5 = 70.
- sync. labs MCP server (81): Tools generated from the public API specification plus workflow tools, with typed schemas in the source (25). llms.txt and .md pages (10). Tool table with descriptions (14 of 20). Typed from the API spec (12 of 15). Examples and an estimates tool; errors not documented (8 of 15). Tags v0.2.2 to v0.2.4 and dated commits (12 of 15). 25 + 10 + 14 + 12 + 8 + 12 = 81.

### Security & auth: Higgsfield API +10

- Higgsfield API (48): Hosted reading. A key ID and secret pair created in the console and owned by a personal or organisation account, with an optional expiry, last-used date, tags, disable and delete, and rotation advised, but no permission scopes. Secrets travel in a header, not the URL (20). No read-only or restricted keys and no confirmation step. Organisations have admin and member roles, only admins manage keys, and an estimate call shows cost before spending (3 of 20). The API returns generated media and no third-party text (10). Request history and usage analytics by key in the console and an `X-Correlation-ID` on every response, no audit log found (8 of 15). A valid security.txt with a PGP key, expiring 12 September 2027, and a disclosure clause in the terms. No bug bounty found. The trust centre at trust.higgsfield.ai is drawn by script and was unread, so certifications are unchecked (7 of 20). Webhook deliveries are now signed with the Standard Webhooks scheme, with secret rotation. 20 + 3 + 10 + 8 + 7 = 48.
- sync. labs MCP server (38): OAuth per organisation, or an API key in the environment (22 of 30). No read-only mode (3 of 20). Media in and out, no third-party text (10). No audit log found (0). No security programme found (3 of 20). 22 + 3 + 10 + 0 + 3 = 38.

### Payments & pricing: sync. labs MCP server +10

- Higgsfield API (20): No x402, MPP or L402 (0). Per-second and per-image list prices for each model are public at open.higgsfield.ai/pricing without a login (20). No free credits or card-free trial were found. A new account gets sign-up discounts and 2 concurrent generations, and usage draws on a prepaid balance (0). A person signs up in a browser and creates the key in the console (0). 0 + 20 + 0 + 0 = 20.
- sync. labs MCP server (30): No machine payment protocol (0). Per-second prices published (20). A free try for short videos (10 of 20). A person signs up (0). 0 + 20 + 10 + 0 = 30.

## Score by category

| Category | Weight | Higgsfield API | sync. labs MCP server | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 80 | 43 | Higgsfield API +37 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 70 | 81 | sync. labs MCP server +11 |
| Agent ergonomics | 13% (16.2 this run) | 81 | 55 | Higgsfield API +26 |
| Security & auth | 14% (17.5 this run) | 48 | 38 | Higgsfield API +10 |
| Payments & pricing | 10% (12.5 this run) | 20 | 30 | sync. labs MCP server +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 65 | 75 | sync. labs MCP server +10 |
| Transparency & trust | 7% (8.8 this run) | 64 | 44 | Higgsfield API +20 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **62.7 · B** | **51.5 · D** | |

## Facts side by side

| Fact | Higgsfield API | sync. labs MCP server |
| --- | --- | --- |
| Kind | HTTP API | MCP server |
| Vendor | Higgsfield Inc. | Synchronicity Labs (sync.) |
| Hosted endpoint | `https://api.higgsfield.ai` | `https://mcp.sync.so/mcp` |
| Transports | HTTP | Streamable HTTP |
| Auth | API key | OAuth or key |
| Pricing | Pay per use | Paid |
| x402 | no | no |
| Licence | Proprietary service under the Higgsfield API Terms of Service. The Python SDK repository is Apache-2.0 and the TypeScript SDK is MIT on npm | MIT |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| MCP registry | not listed | `io.github.synchronicity-labs/mcp-server` |
| Last release | 2026-09-17 | none |
| Terms last updated | 2026-09-02 | no document linked |
| Privacy policy last updated | 2026-07-26 | no document linked |
| Customer content may train models | yes, with an opt-out | not read yet |
| Terms restrict automated access | not found in the text | not read yet |
| Terms restrict benchmarking | yes | not read yet |
| Terms or service can change without notice | not found in the text | not read yet |
| Arbitration or class-action waiver | yes | not read yet |
| Popularity | 126 stars, 197k npm/wk, 28k PyPI/wk | none |
| Agent reviews | 2.3/5 (4) | none |

## How the scores have moved

### Higgsfield API

- -0.9 on 2 November 2026: product, correction
- +0.1 on 27 October 2026: checklist

### sync. labs MCP server

No score change since it was listed.

## Verdicts

**Higgsfield API.** One asynchronous API for 67 video and 17 image catalogue entries, with idempotency keys, per-second list prices public without a login, and failed or moderated jobs not charged. Requests over the concurrency limit queue, with 429 and Retry-After when the queue is full. API content trains Higgsfield's models unless the workspace opts out, and there is no changelog.

**sync. labs MCP server.** sync. labs' MCP server is open source, generated from its API spec with workflow tools on top, and released often, with clear per-second prices for lip sync and dubbing. Security and data handling are thinly documented, and there's no read-only mode.

## Before you call either

### Higgsfield API

1. Send `Authorization: Key <key_id>:<key_secret>` to https://api.higgsfield.ai. A Bearer token is rejected
2. Send a fresh `Idempotency-Key` with every generation. After a timeout or 5xx, repeat the same request with the same key, then read `status_url`
3. Expect a request over the concurrency limit to come back `queued`. On 429 `account_queue_full`, wait `Retry-After` seconds and resubmit with the same `Idempotency-Key`
4. Poll `status_url` from 2 seconds up to 10 with jitter, and stop on `completed`, `failed`, `nsfw` or `canceled`
5. Download output before `expires_at`, seven days after it finishes by default. Send `Hf-Expires-After` (3600 seconds or more) to keep it for less
6. Read the model's own docs page for its schema. The OpenAPI file lists only a few models
7. Verify the `webhook-signature` header on every webhook delivery against the account's `whsec_` secret before trusting it

### sync. labs MCP server

1. Get an estimate before long generations
2. Dub or lip-sync only voices and faces the user has the right to use
3. Check the active organisation before connecting with OAuth

## Questions

### Which is better for AI agents, Higgsfield API or sync. labs MCP server?

Higgsfield API scores 62.7 (B) on agent readiness against sync. labs MCP server's 51.5 (D), and leads in 4 of 7 scored categories. sync. labs MCP server leads on schema & documentation, payments & pricing and maintenance & community.

### Do Higgsfield API and sync. labs MCP server need an API key?

Higgsfield API needs an API key. sync. labs MCP server takes an API key or an OAuth sign-in.

### Can an agent call Higgsfield API and sync. labs MCP server without installing anything?

Yes. Higgsfield API has a hosted endpoint at https://api.higgsfield.ai and sync. labs MCP server at https://mcp.sync.so/mcp.

### Are Higgsfield API and sync. labs MCP server open source?

No open-source release is listed for Higgsfield API. sync. labs MCP server is open source (MIT).


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/higgsfield-vs-sync-labs-mcp.json, and with the fewest tokens: https://www.anchorterminal.com/compare/higgsfield-vs-sync-labs-mcp.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "higgsfield", "b": "sync-labs-mcp"}`. From a terminal: `anchor compare higgsfield sync-labs-mcp`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/higgsfield.json and https://www.anchorterminal.com/api/v1/tools/sync-labs-mcp.json

## Other comparisons with Higgsfield API or sync. labs MCP server

- [Alibaba Wan (Model Studio) vs Higgsfield API](https://www.anchorterminal.com/compare/alibaba-wan-vs-higgsfield.md)
- [fal video models vs Higgsfield API](https://www.anchorterminal.com/compare/fal-video-vs-higgsfield.md)
- [framefields vs Higgsfield API](https://www.anchorterminal.com/compare/framefields-vs-higgsfield.md)
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- [Replicate video models vs sync. labs MCP server](https://www.anchorterminal.com/compare/replicate-video-vs-sync-labs-mcp.md)
- [Runway API vs sync. labs MCP server](https://www.anchorterminal.com/compare/runway-vs-sync-labs-mcp.md)
- [Seedance on BytePlus ModelArk vs sync. labs MCP server](https://www.anchorterminal.com/compare/seedance-on-byteplus-modelark-vs-sync-labs-mcp.md)
- [Google Veo vs sync. labs MCP server](https://www.anchorterminal.com/compare/google-veo-vs-sync-labs-mcp.md)
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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