# Coil Change Detection API

**Canonical:** https://apis.io/apis/coil-trade/coil-trade-change-detection-api/  
**Provider:** Coil — https://apis.io/providers/coil-trade/  
**Base URL:** https://coil.trade  
**Documentation:** https://coil.trade/docs

Coil Change Detection API is one of 7 APIs that [Coil](https://apis.io/providers/coil-trade/) publishes on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. Tagged areas include Change Detection. The published artifact set on APIs.io includes an OpenAPI specification.

The polling loop: hash the board for free, buy the delta only when it moves. An unchanged hash is never billed.

## Operations (2)

| Method | Path | Summary |
|---|---|---|
| GET | `/api/board/state` | FREE — has the board materially changed? |
| GET | `/api/board/diff` | What changed since the state hash you hold — poll free, buy only when it moves |

## Machine-readable artifacts (1)

- **OpenAPI** — https://artifacts.apis.io/coil-trade/openapi/coil-trade-change-detection-api-openapi.yml

## Other Coil APIs (6)

- [Coil Access & Keys API](https://apis.io/apis/coil-trade/coil-trade-access-keys-api/)
- [Coil Coil Live API](https://apis.io/apis/coil-trade/coil-trade-coil-live-api/)
- [Coil Market Data API](https://apis.io/apis/coil-trade/coil-trade-market-data-api/)
- [Coil Paid reads API](https://apis.io/apis/coil-trade/coil-trade-paid-reads-api/)
- [Coil Research API](https://apis.io/apis/coil-trade/coil-trade-research-api/)
- [Coil Verification API](https://apis.io/apis/coil-trade/coil-trade-verification-api/)

## Tags

Change Detection

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