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/api/etf/issuer
GETAvailable

ETF / trust products of one issuer

ETF / trust products of one issuer

GET/api/etf/issuer

Request

Query parameters

NameTypeRequiredDefaultAllowed valuesDescription
issuerstringOptionalGrayscale—Issuer name (max 64 chars). Example: Grayscale

Example request

curl -s "https://www.coinboss.com/api/etf/issuer?issuer=Grayscale"

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 }`.
issuerstring—Fund issuer.
unitstring—Unit of the values in this object.
productsarray—ETF products of the issuer with their full flow history; BTC products first, then by ticker.
products[]object—One product: `ticker`, underlying `asset`, row `count`, `latest` summary and daily `data`.
products[].tickerstring—Fund ticker.
products[].assetstring—Asset symbol.
products[].countnumber—Number of items.
products[].latestobject—Most recent record.
products[].latest.datestring—Calendar date (UTC).
products[].latest.flownumber—Net creation / redemption flow of the day.
products[].latest.cum_totalnumber—Cumulative total.
products[].latest.aumnumber|null—Assets under management.
products[].latest.aum_datestring|null—Trading day (YYYY-MM-DD) of the row `latest.aum` is taken from; may be older than `latest.date`, null when no AUM exists.
products[].latest.sum_7dnumber—7-day sum.
products[].dataarray—Payload.
products[].data[]object—Payload.
products[].data[].datestring—Calendar date (UTC).
products[].data[].flownumber—Net creation / redemption flow of the day.
products[].data[].aumnumber|null—Assets under management.
products[].data[].premiumnumber|null—Premium (+) or discount (−) of the market price to NAV.
products[].data[].cumnumber—Cumulative net flow since listing.

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

Example response

/api/etf/issuer?issuer=Grayscale · Real response captured 2026-11-13 03:58:19 UTC. Long arrays and maps are shortened for display: products had 6 items; products[].data had 713 items.

  • {
    • "success": true,
    • "issuer": "Grayscale",
    • "unit": "million_usd",
    • "products": [
      • { … 5 },
      • { … 5 }
      ]
    }

Details

Authentication
None. Public endpoint.
Rate limit
1200 requests per minute per IP
Server cache
5m
Edge micro-cache
10s
Update frequency
hourly (minute 15); source publishes once per US trading day
Window
full history per product
Data sources
Per-product flow history for one ETF issuer, from a public ETF flow tracker; AUM from a public market-data site.
Exchange coverage
Products of the given issuer (default Grayscale) across BTC/ETH/SOL/HYPE; issuer name must match the stored label exactly.
Sorting
products: BTC first, then by ticker; data by date ascending
Units
million USD (flow, cum, aum); premium in percent
Method
cum is the running sum of daily flows per product; sum_7d sums the last 7 trading days.
Timestamps
Unix epoch milliseconds (UTC) unless the field description says otherwise
Response format
json
Stability
Stable

Live status

AvailableChecked 2026-11-13 03:58:19 UTCHTTP 20012 msSchema matchesNewest data point 28h old

Availability, last 30 days

100% of 410 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/etf/issuerAvailable
Parameters

string · default Grayscale — Issuer name (max 64 chars).

Request URLhttps://www.coinboss.com/api/etf/issuer?issuer=Grayscale
Choose an endpoint and press “Send request”. The response, headers and timing will appear here.