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/api/grayscale/premium
GETDegraded

Grayscale trust premium / discount

Grayscale trust premium / discount

GET/api/grayscale/premium
Degraded. The newest data point is 22672 s old (expected within 21600 s)

Request

This endpoint takes no parameters.

Example request

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

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 }`.
fetched_atnumbermsWhen CoinBoss fetched the data from the source.
itemsarray—Result items.
items[]object—Result items.
items[].tickerstring—Fund ticker.
items[].namestring—Name.
items[].assetstring—Asset symbol.
items[].navnumberUSDLast published net asset value per share of the fund, from a third-party quote source; null when unavailable.
items[].pricenumber—Last price in the quote currency (USD or USDT unless stated).
items[].market_timenumbermsTimestamp.
items[].premium_pctnumber%Premium over the reference price.
historyarray—Historical points, oldest first unless stated.
history[]object—Historical points, oldest first unless stated.
history[].datestring—Calendar date (UTC).
history[].GBTCnumber%Premium (+) or discount (−) of the GBTC market price to its NAV as last recorded on that UTC date.
history[].BTCnumber%Premium (+) or discount (−) of the Grayscale Bitcoin Mini Trust (ticker `BTC`) market price to its NAV as last recorded on that UTC date.
history[].ETHEnumber%Premium (+) or discount (−) of the ETHE market price to its NAV as last recorded on that UTC date.
history[].ETHnumber%Premium (+) or discount (−) of the Grayscale Ethereum Mini Trust (ticker `ETH`) market price to its NAV as last recorded on that UTC date.

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

Example response

/api/grayscale/premium · Real response captured 2026-11-13 03:17:52 UTC. Long arrays and maps are shortened for display: items had 4 items; history had 66 items.

  • {
    • "success": true,
    • "fetched_at": 1794539571973,
    • "items": [
      • { … 7 },
      • { … 7 }
      ],
    • "history": [
      • { … 5 },
      • { … 5 }
      ]
    }

Details

Authentication
None. Public endpoint.
Rate limit
1200 requests per minute per IP
Server cache
10m
Edge micro-cache
10s
Update frequency
on request, cached 1 hour; one history point accumulated per day
Window
latest snapshot plus locally accumulated daily history
Data sources
Premium/discount of Grayscale BTC and ETH trusts computed from market price and NAV on a public market-data site.
Exchange coverage
GBTC, Bitcoin Mini Trust, ETHE, Ethereum Mini Trust.
Units
percent (premium_pct); USD (price, NAV)
Method
premium_pct = (market price - NAV) / NAV x 100.
Timestamps
Unix epoch milliseconds (UTC) unless the field description says otherwise
Response format
json
Stability
Stable

Live status

DegradedChecked 2026-11-13 03:17:52 UTCHTTP 2001 msSchema matchesNewest data point 6.3h old

The newest data point is 22672 s old (expected within 21600 s)

Availability, last 30 days

100% of 402 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/grayscale/premiumDegraded
Parameters

No parameters.

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