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/api/p3/cb-kr-spread
GETAvailable

Daily BTC price spread between Coinbase and Kraken

Daily BTC price spread between Coinbase and Kraken

GET/api/p3/cb-kr-spread

Request

Query parameters

NameTypeRequiredDefaultAllowed valuesDescription
daysintegerOptional365≤ 4200Look-back window in days. Example: 365

Example request

curl -s "https://www.coinboss.com/api/p3/cb-kr-spread?days=365"

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 }`.
kraken_sincestring—Date of the earliest Kraken BTC/USD daily candle held (ISO timestamp of midnight UTC+8, so the UTC date shown is one day early).
kraken_untilstring—Date of the latest Kraken BTC/USD daily candle held (ISO timestamp of midnight UTC+8, so the UTC date shown is one day early).
latestobject—Most recent record.
latest.tsnumbermsTimestamp.
latest.cbnumberUSDCoinbase BTC-USD daily close of the most recent day in `series`.
latest.krnumberUSDKraken BTC/USD daily close of the most recent day in `series`.
latest.gapnumber—Price gap.
latest.gap_pctnumber%Price gap.
seriesarray—Time series.
series[]object—Time series.
series[].tsnumbermsTimestamp.
series[].cbnumberUSDCoinbase BTC-USD daily close for that day.
series[].krnumberUSDKraken BTC/USD daily close for that day.
series[].gapnumber—Price gap.
series[].gap_pctnumber%Price gap.

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

Example response

/api/p3/cb-kr-spread?days=365 · Real response captured 2026-11-13 03:58:09 UTC. Long arrays and maps are shortened for display: series had 364 items.

  • {
    • "success": true,
    • "kraken_since": "2013-10-05T16:00:00.000Z",
    • "kraken_until": "2026-11-11T16:00:00.000Z",
    • "latest": {
      • "ts": 1794412800000,
      • "cb": 71370.57,
      • "kr": 71356,
      • "gap": 14.57,
      • "gap_pct": 0.0204
      },
    • "series": [
      • { … 5 },
      • { … 5 }
      ]
    }

Details

Authentication
None. Public endpoint.
Rate limit
1200 requests per minute per IP
Server cache
10m
Edge micro-cache
10s
Update frequency
every 6 hours (daily bars)
Window
last 365 days by default (`days` max 4200)
Data sources
Coinbase vs Kraken BTC/USD daily close spread computed in-house from the two exchanges' public candles.
Exchange coverage
BTC/USD only; kraken_since / kraken_until report the covered date range.
Sorting
date ascending
Units
USD (gap) and percent (gap_pct)
Method
gap = Coinbase close - Kraken close; gap_pct = gap / Kraken close x 100.
Timestamps
Unix epoch milliseconds (UTC) unless the field description says otherwise
Response format
json
Stability
Stable

Live status

AvailableChecked 2026-11-13 03:58:09 UTCHTTP 2001 msSchema matchesNewest data point 36h 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/p3/cb-kr-spreadAvailable
Parameters

integer · default 365 · max 4200 — Look-back window in days.

Request URLhttps://www.coinboss.com/api/p3/cb-kr-spread?days=365
Choose an endpoint and press “Send request”. The response, headers and timing will appear here.