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1

Verify Authorization header

Ensure requests include Authorization: Bearer YOUR_TOKEN and no stray whitespace.
2

Check token validity and scope

Confirm token is unexpired and has scope for the targeted datasets/chains. Rotate if necessary.
3

Test with minimal cURL

curl -i -X POST "https://api.blockdb.io/v1/evm/blocks" \
  -H "Authorization: Bearer $BLOCKDB_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"chain_id":1,"from_block":1,"to_block":2}'
4

Escalate with context

Share timestamp (UTC), request_id, and a minimal reproduction to support.