# 645 Ventures (slim)

> 645 Ventures's investments in AI tools on Anchor Terminal, Causely, Inc. and Fish Audio, with each listing's grade and the founders behind it.

- Full: https://www.anchorterminal.com/investors/645-ventures/index.md (~650 tokens) · this version ~530 tokens · JSON https://www.anchorterminal.com/investors/645-ventures/index.json · canonical https://www.anchorterminal.com/investors/645-ventures/
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-10-28
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)

Venture firm.

Website: https://645ventures.com

## Companies on Anchor Terminal

- **Causely, Inc.**
  - [Causely MCP server](https://www.anchorterminal.com/tools/causely.md), graded E, 39.7/100
  - Source: https://www.causely.ai/company
- **Fish Audio**, Seed, July 2026
  - [Fish Audio Drama 3](https://www.anchorterminal.com/tools/fish-audio-drama-3.md), graded C, 55.6/100
  - [Fish Audio S2 Pro](https://www.anchorterminal.com/tools/fish-audio-s2-pro.md), graded D, 52.5/100
  - [Fish Audio TTS API](https://www.anchorterminal.com/tools/fish-audio-tts.md), graded C, 60.7/100
  - [Fish Audio Voice Cloning API](https://www.anchorterminal.com/tools/fish-audio-voice-cloning.md), graded C, 60/100
  - Source: https://fish.audio/blog/fish-audio-52m-seed-funding/

## Where they invest

- Text-to-speech, 3
- Observability & incidents, 1
- Voice cloning & custom voices, 1

## Founders they backed

- [Shmuel Kliger](https://www.anchorterminal.com/people/shmuel-kliger/), Causely, Inc.
- [Christine Miller](https://www.anchorterminal.com/people/christine-miller/), Causely, Inc.
- [Endre Sara](https://www.anchorterminal.com/people/endre-sara/), Causely, Inc.
- [Enlin Xu](https://www.anchorterminal.com/people/enlin-xu/), Causely, Inc.

## Questions

### Which AI tools has 645 Ventures invested in?

Anchor Terminal lists Causely, Inc.

### How are 645 Ventures's companies graded?

On Anchor Terminal's benchmark, Causely MCP server (E, 39.7), Fish Audio Drama 3 (C, 55.6), Fish Audio S2 Pro (D, 52.5), Fish Audio TTS API (C, 60.7) and Fish Audio Voice Cloning API (C, 60).

Investors are named from the companies' own announcements, the investors' own pages, Y Combinator's company pages, public filings and news reports of a round, each with its source.