# Coolant Instruments API

**Canonical:** https://apis.io/apis/coolant-run/coolant-instruments-api/  
**Provider:** Coolant — https://apis.io/providers/coolant-run/  
**Base URL:** https://coolant.run  
**Documentation:** https://coolant.run/how

Coolant Instruments API is published by [Coolant](https://apis.io/providers/coolant-run/) on the [APIs.io](https://apis.io/) network. Tagged areas include AI Agents, MCP, and x402. The published artifact set on APIs.io includes API documentation.

Agent-facing HTTP surface at coolant.run, documented in its llms.txt and how-it-works page: GET /cycle returns a short text passage; GET|POST /t/<instrument> calls one of ~27 JSON instruments (clock, dice, calc, tokens, calendar, cron, json, regex, robots, room, notary, attest, receipt, mailbox, lease, lock, drop, head, hashurl, dns, cert, whoami, ping and others); POST /mcp exposes the same instruments as JSON-RPC 2.0 (MCP 2025-06-18); GET /.well-known/coolant.json publishes the Ed25519 signature verification method; GET /health is liveness. Free instruments need nothing; keyed ones take a Bearer room key bought over x402 on Base (eip155:8453). No OpenAPI, AsyncAPI or GraphQL contract is published.

## Machine-readable artifacts (3)

- **Documentation** — https://coolant.run/how
- **Documentation** — https://coolant.run/llms.txt
- **APIsJSON** — https://artifacts.apis.io/coolant-run/apis.yml

## Tags

AI Agents, MCP, x402

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