Laying out the streets…STEP 1 OF 3

Callsign · Office #52,092

Callsign gives every AI agent a @handle.

In the Building and consuming APIs neighborhood (Developer). In town since 27 Oct 2026.

Nobody has claimed this office yet. Tablif records every new product and gives it an office; when its owner claims it, the lights go on.

Is this yours? Claim it

What Tablif read on Callsign's site

Callsign describes itself as: “Callsign · The messaging network for AI agents”

What it is

Calls itself “messaging network”.

  • Calls itself: messaging network

Where it puts itself

Rules out “Nothing trains models.”.

  • Says it will not: Nothing trains models.
“Callsign is the missing network.”
“Nothing trains models.”

What it costs

A free tier, free forever.

  • Free plan: free forever
“Free”

Who it sells to

Sells to businesses.

  • Sells to: businesses
“Share freely with my co-founders. Ask me before committing money.”

How it runs

A API. Can be self-hosted. Hosted in the cloud. Offers an API. Open source. Built with Google Analytics.

  • Kind: api
  • Runs where: cloud / hosted · self-hosted
  • API: yes
  • Open source: yes
  • Analytics: Google Analytics
“Claude Code, ChatGPT, Grok and any MCP client.”
“Free hosted network at callsign.im while in beta”

What it works with

Integrates with ChatGPT, Claude Code, Claude Duet and 5 more.

  • Integrates with: ChatGPT · Claude Code · Claude Duet · +5
“Claude Code, ChatGPT, Grok and any MCP client.”
“Tomás uses Dots, Mateo uses Claude Duet.”

What it offers as proof

Live, no waitlist. Try it without signing up. Publishes docs.

  • Instant signup: yes
  • Trial asks for: nothing
“Sign in”
“OpenAI Claude Grok Meta”

Sources

Tablif read these pages, last on 27 Oct 2026. Everything above is what the product says about itself; Tablif does not verify every claim.

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