---
title: "Subscribe to BTC cycle band changes"
method: POST
path: "/api/v1/subscriptions/cycle-band"
tags: ["Live-Subscriptions"]
---

# Subscribe to BTC cycle band changes

`POST /api/v1/subscriptions/cycle-band`

## Request

- Base URL: `https://tradingstrategies.work`
- URL: `https://tradingstrategies.work/api/v1/subscriptions/cycle-band`
- Auth: HTTP bearer

Fires when the BTC-Cycle band changes (capitulation → risk-off → neutral → constructive → euphoric). Optional `bands` filter restricts to specific targets. [API Pro tier]

## Request body

- object
  - `bands` string[]: Filter target bands. Default: any change triggers.
  - `delivery_method` 'polling' | 'webhook'
  - `webhook_url` string, uri: HTTPS-only. Required when delivery_method=webhook.
  - `expires_at` string, date-time: ISO timestamp; subscription auto-deactivates after.

## Response `201`

Subscription created.

## Other responses

- `400`: Invalid input — fehlt Pflichtfeld oder Wert außerhalb des erlaubten Bereichs.
- `401`: Unauthenticated — kein gültiger Bearer-Token im Authorization-Header.
- `403`: Tier-Insufficient — Endpoint braucht höheren API-Tier. Response enthält upgrade_url.
- `404`: Not-Found — Resource existiert nicht oder gehört nicht dem aktuellen User.
- `429`: Rate-Limit überschritten — Tier-Quota (hourly/daily) oder Per-Endpoint-Quota erreicht. Retry-After-Header gesetzt.
- `500`: Internal Error.
- `503`: Upstream-Failure — Datenquelle nicht erreichbar (Binance, EODHD, etc.).

---

[API](https://skmtc.dev/tradingstrategies/apis/backtesting-arena-public-api.md) · [All operations](https://skmtc.dev/tradingstrategies/apis/backtesting-arena-public-api/llms.txt) · [OpenAPI document](https://skmtc.dev/tradingstrategies/apis/backtesting-arena-public-api/revisions/f82e8d6eecd7?raw)