CEX API

BigONE public market API

Public REST, no authentication for spot market data. All-ticker endpoint can emit null bid or ask sides for some pairs; CoinEel preserves available price and volume fields.

Access

Base URL: https://big.one/api
Authentication: Public REST, no authentication for spot market data.
CoinEel status: Implemented
Maker fee: Not verified yet
Taker fee: Not verified yet
Last updated: 2026-06-02
Last checked: 2026-06-02

Endpoints

Purpose	Endpoint	Parameters	Data availability
Markets / instruments	`GET /api/v3/asset_pairs`	No required parameters for CoinEel's all-market/all-ticker call.	Tradable spot pair identifiers, base/quote metadata where the venue exposes it, and status/trading flags where available.
Tickers / 24h stats	`GET /api/v3/asset_pairs/tickers`	No required parameters for CoinEel's all-market/all-ticker call.	Last price, 24h base/quote volume when exposed, bid/ask when exposed, and native 24h change when exposed.

Rate limits

Official general-info docs describe request constraints; exact public endpoint quotas may vary.

Official source: https://open.big.one/docs/ | https://open.big.one/docs/spot_market_api.html | https://open.big.one/docs/general-info/ | https://big.one/api/v3/asset_pairs | https://big.one/api/v3/asset_pairs/tickers

Fees

Maker: Not verified yet; taker: Not verified yet.

Example

curl -sS 'https://big.one/api/api/v3/asset_pairs/tickers'

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