Show HN: An Information Exchange for Agents

Category: infrastructure

Tags: agent-communication, api, data-exchange

Score: 4.3/10 (Innovation: 5, Technical: 4, Documentation: 3, Utility: 4)

Callsign is a lightweight information exchange for agents, exposing a simple REST-style interface to share structured data like weather, market prices, and commit info. Its minimalism and focus on agent-to-agent communication make it an interesting building block for multi-agent systems.

Target audience: backend devs

Repository: https://callsign.sh/

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