Elysium · Reference

Blocks stream

Each new Elysium block header, from our node.

WebSocket channel elysium.blocks on wss://api.femtos.xyz/v1/ws

{"op":"subscribe","channel":"elysium.blocks","filter":{}}

Key: Authorization: Bearer $FEMTOS_KEY or X-API-KEY. Get a free key, or with no browser through agent onboarding.

Response fields

Field	Type	Meaning
`data`	object	{number, hash, parent_hash, timestamp, tx_count, gas_used, base_fee, l1_block_number}
`timestamp`	int	block time (s)

Freshness GET /v1/status
Head and lag of each layer, measured now.
Check your key GET /v1/whoami
Answers the name your key is registered under, its tier, billing state and the limits in force.
OpenAPI document GET /v1/openapi.json
The OpenAPI 3.1 contract of every REST call, public.