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Option A — Shared sandbox key (instant, no sign-up)

Use the pre-populated shared sandbox API key to get a token immediately:
Response
Pass the access_token as Authorization: Bearer <token> on every request. Tokens expire in 60 minutes — call /auth/token again with the same key to refresh. The API key itself never expires.
This is a shared public sandbox key. Any developer following these docs can read and write to the shared sandbox account. For private isolated testing, use Option B below.

Option B — Your own sandbox account

For isolated sandbox data with your own wallets and transactions:
  1. Sign up at sandbox-crypto.yativo.com — sign-up is passwordless, you’ll receive a one-time code by email
  2. Go to Settings → API Keys and create a sandbox API key
  3. Use your key with the token endpoint:

Using the token

Pass the token on every sandbox request:

Refreshing a token

Simply call /auth/token again with the same API key credentials — there is no separate refresh endpoint: