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/api/p3/premium-index
GETAvailable

Perp premium index list

Perp premium index list (all venues)

GET/api/p3/premium-index

Request

This endpoint takes no parameters.

Example request

curl -s "https://www.coinboss.com/api/p3/premium-index"

Response fields

The field table is generated from real responses, so it lists exactly what the endpoint returns. Paths use a[] for array items and {*} for objects keyed by a dynamic name such as a coin or an exchange.

FieldTypeUnitDescription
successboolean—true when the request succeeded. On failure the body is `{ success: false, code, error, request_id }`.
nownumbermsServer time when the response was built.
dataarray—Payload.
data[]object—Payload.
data[].exchangestring—Exchange id, lower case (for example `binance`).
data[].symbolstring—Instrument symbol as normalised by CoinBoss (for example BTCUSDT).
data[].basestring—Base asset symbol.
data[].spotnumber—Spot market block or value.
data[].perpnumber—Perpetual market block or value.
data[].premium_usdnumberUSDTAbsolute premium of the perpetual over spot on that exchange: `perp` − `spot`, in the quote currency (USDT).
data[].premium_pctnumber%Premium over the reference price.
data[].staleboolean—Rows or flag for data older than the freshness window.

Generated 2026-11-11 23:00 UTC from 1 real responses.

Example response

/api/p3/premium-index · Real response captured 2026-11-13 01:42:46 UTC. Long arrays and maps are shortened for display: data had 95 items.

  • {
    • "success": true,
    • "now": 1794534166584,
    • "data": [
      • { … 8 },
      • { … 8 }
      ]
    }

Details

Authentication
None. Public endpoint.
Rate limit
1200 requests per minute per IP
Server cache
60s
Edge micro-cache
10s
Update frequency
every 5 min
Window
latest snapshot (rows older than 1 h flagged stale)
Data sources
Spot vs perpetual prices polled in-house from the public ticker APIs of 5 exchanges (binance, okx, bybit, bitget, gate).
Exchange coverage
5 exchanges x 19 major coins; rows with spot price <= 0 dropped
Sorting
|premium_pct| desc
Units
premium_usd in USD; premium_pct in percent
Method
premium_usd = perp price - spot price (basis_abs); premium_pct = basis_pct
Timestamps
Unix epoch milliseconds (UTC) unless the field description says otherwise
Response format
json
Stability
Stable

Live status

AvailableChecked 2026-11-13 01:42:46 UTCHTTP 2002 msSchema matches

Availability, last 30 days

100% of 383 checks passed

Errors

Failed calls share one shape on every endpoint. The full list is on the errors page. Errors and rate limits →

CodeHTTPMeaningWhat to do
INVALID_PARAM400A required parameter is missing or a value is not accepted. `param` names the parameter when it is known.Do not retry unchanged; fix the request.
UNAUTHORIZED401The `CB-API-KEY` header was sent but the key is unknown or revoked. Public data needs no key — drop the header or use a valid key.Do not retry unchanged.
FORBIDDEN403The route is not part of the public API (internal or account-only).Do not retry.
NOT_FOUND404Unknown route, or the requested coin / exchange / fund does not exist.Do not retry; check the path and identifiers against the catalog.
RATE_LIMITED429More requests than the per-minute limit. `Retry-After` gives the seconds to wait.Wait for `Retry-After`, then retry with backoff.
INTERNAL500Unexpected server error. The message is generic by design; quote `request_id` when reporting it.Retry once after a few seconds; report it with the request id if it persists.
UPSTREAM_FAILED503The data source behind this endpoint did not answer in time. No stale or substitute numbers are returned in its place.Retry with backoff; check the status page.
UNAVAILABLE501 / 503The dataset is temporarily not ready (cache warming) or the endpoint has no lawful public source yet.Retry later; the catalog marks endpoints that are unavailable by design.
REQUEST_FAILED200Some older endpoints answer HTTP 200 with `success: false`. Always check `success`, not only the HTTP status.Depends on the message; treat as a failed request.

Try it

GET/api/p3/premium-indexAvailable
Parameters

No parameters.

Request URLhttps://www.coinboss.com/api/p3/premium-index
Choose an endpoint and press “Send request”. The response, headers and timing will appear here.