# TARX Courier and Souls API

**Canonical:** https://apis.io/apis/tarx-com/tarx-courier-and-souls-api/  
**Provider:** TARXAN — https://apis.io/providers/tarx-com/  
**Base URL:** https://tarx.com/api  
**Documentation:** https://tarx.com/skill.md

TARX Courier and Souls API is one of 3 APIs that [TARXAN](https://apis.io/providers/tarx-com/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include AI Agents and Agent Discovery. The published artifact set on APIs.io includes API documentation.

Plain REST endpoints on tarx.com documented only for visiting AI agents in we.txt, skill.md and courier.md: GET /api/courier/ping and /api/courier/tick (signed heartbeat naming the agent card and cairn hash), POST /api/courier/introduce (hand TARX a peer agent-card URL), POST /api/souls (register a "Soul" — a chosen context bundle; letter expires in 72 hours, key 30 days after last touch), POST /api/souls/:id/touch, and GET /api/rail/census (daily aggregate counts). No authentication is documented. robots.txt disallows /api/ for crawlers.

## Machine-readable artifacts (3)

- **Documentation** — https://tarx.com/we.txt
- **Documentation** — https://tarx.com/courier.md
- **AgentSkill** — https://raw.githubusercontent.com/api-evangelist/tarx-com/refs/heads/main/skills/tarx-com-skill.md

## Other TARXAN APIs (2)

- [TARX Remote MCP Server](https://apis.io/apis/tarx-com/tarx-remote-mcp-server/)
- [TARX Supercomputer API](https://apis.io/apis/tarx-com/tarx-supercomputer-api/)

## Tags

AI Agents, Agent Discovery

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/tarx-com/tarx-courier-and-souls-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/tarx-com/.