Beta
HyperCore APIs are in beta. Message fields, limits, and behavior may change, including breaking changes. To request access, contact [email protected].
Mid prices for each market, sent whenever a mid changes.
{
"method": "subscribe",
"subscriptionId": "mids_01",
"subscription": {
"type": "allMids",
"coins": [
"BTC",
"ETH"
]
}
}| Parameter | Type | Required | Description |
|---|---|---|---|
coins | string[] | No | Markets to include, up to 200. Omit, or send [], for every market (one unfiltered subscription per stream per connection). Unknown coins stay subscribed and return empty data until the market exists. |
{
"channel": "subscriptionResponse",
"subscriptionId": "mids_01",
"data": {
"type": "allMids",
"coins": [
"BTC",
"ETH"
]
}
}{
"seq": 1,
"channel": "allMids",
"subscriptionId": "mids_01",
"data": {
"blockNumber": 1183759643,
"blockTime": 1791999593526,
"isSnapshot": true,
"mids": {
"BTC": "81772.5",
"ETH": "2436.05"
}
}
}| Field | Description |
|---|---|
data.mids | Map of coin to mid price (a decimal string). The snapshot includes only markets with both a bid and an ask. In later messages, a value is null when that market loses its bid or ask; treat null as "no mid" until a later message sends a price. |
The first message includes every subscribed market that currently has a mid. A market without both a bid and an ask is left out until it has one. Later messages include only markets whose mid changed, with null when a market loses its mid.
{"method":"unsubscribe","subscriptionId":"mids_01"}Book streams have no replay. After a disconnect, or if seq skips, resubscribe; the first message is a fresh snapshot. If you receive a book_reset error, drop local state for the subscription and rebuild from the snapshot that follows. See replay and recovery.