Data API

Authentication

The SMR20 Data API authenticates with a single API key. Include it on every request using the x-api-key header (or an Authorization: Bearer header).

Demo key

A rate-limited demo key ships with the dev seed so you can try the API immediately:

smr20_demo_key_free_0001

Sending the key

cURL

# header form
curl -H "x-api-key: smr20_demo_key_free_0001" \
  https://smr20.com/api/v1/prices/today

# bearer form
curl -H "Authorization: Bearer smr20_demo_key_free_0001" \
  https://smr20.com/api/v1/prices/today

Errors

401 — missing or invalid API key.
429 — rate limit exceeded for your tier; retry after the window resets.