API · 5-10 min · Spot · Staking · Liquidity Mining · Deposits · Withdrawals · 100+ countries
What’s covered
Spot trades
Buy, sell, and conversions.
Staking and Liquidity Mining
Staking rewards and liquidity mining income.
Deposits and Withdrawals
On-chain deposits and withdrawals.
Trading Fees and Rebates
Fee records and trading rebates.
Before you start
BigONE account
Active account with transaction history.
KoinX account
Free account - no credit card needed.
Connect BigONE to KoinX
API Key syncs your full BigONE transaction history automatically - no file exports needed.- API Key
Generate your BigONE API key
1
Log in to BigONE
Go to big.one and sign in to your account.
2
Open Settings
Click the profile icon in the top right corner and select Settings.
3
Go to API Keys
Click on the API Keys section.
4
Add a new API key
Click the Add button.
5
Set read-only permissions and create
Set the correct read-only permissions and click Next. Your API key will be created.
6
Copy your API key and Secret Key
Copy both your API Key and Secret Key and store them securely. The Secret Key is shown only once.
Connect BigONE to KoinX
1
Open KoinX Integrations
Log in to app.koinx.com -> Integrations -> Add Integration.
2
Select BigONE
Search for BigONE and select it.
3
Paste your keys and import
Paste your API Key and Secret Key into the respective fields and click Import Now.
Done. KoinX begins syncing your BigONE history. Large accounts may take a few minutes.
API key notes
- Read Only is required - keys with broader permissions may be rejected by KoinX as a security measure.
- Secret Key is shown once only - copy it immediately at the time of creation and store it securely.
- Sync from account creation date - import the full transaction history from when you opened your BigONE account to ensure the highest degree of accuracy in your tax report.
Frequently asked questions
What permissions does the BigONE API key need for KoinX?
What permissions does the BigONE API key need for KoinX?
Read Only permissions only. This gives KoinX access to your full transaction history without the ability to place trades or move funds. Never generate an API key with broader permissions for a third-party service.
Will BigONE show my Secret Key again after I leave the page?
Will BigONE show my Secret Key again after I leave the page?
No. BigONE displays the Secret Key only once at the time of creation. Copy it immediately and store it securely. If lost, delete the key from API Keys in Settings and generate a new one.
Do I need to report my BigONE transactions for tax purposes?
Do I need to report my BigONE transactions for tax purposes?
Yes. It is mandatory for all people engaged in crypto activities to follow the tax laws and provisions set by the relevant authority in their region. Not reporting can lead to penalties.
Does BigONE provide tax reports directly?
Does BigONE provide tax reports directly?
No. BigONE does not provide tax-ready reports. By connecting your BigONE account to KoinX via API key, your full transaction history is imported automatically and a compliant, country-specific tax report is generated within minutes.
Does KoinX support my country's crypto tax rules?
Does KoinX support my country's crypto tax rules?
Yes. KoinX supports 100+ countries with dedicated report formats for India, the US, UK, Australia, Canada, Germany, and more. After importing your BigONE data, select your country to generate the correct report.
Troubleshooting
API key error on connection
API key error on connection
Confirm the key was generated with read-only permissions in BigONE -> Profile -> Settings -> API Keys. Delete the credentials in KoinX and re-enter both values carefully - copy directly from BigONE to avoid invisible characters.
Transactions are missing after sync
Transactions are missing after sync
Ensure the transaction history covers the full period from your BigONE account creation date with no gaps. Trigger a manual re-sync from KoinX -> Integrations -> BigONE. If records are still missing, disconnect and reconnect with a fresh API key.
API sync keeps failing
API sync keeps failing
Check the BigONE platform for ongoing maintenance. If the platform is operational, verify the key is still active under Settings -> API Keys. Regenerate if expired, re-enter credentials in KoinX, and trigger a fresh sync.
API connection worked before but stopped syncing
API connection worked before but stopped syncing
BigONE API keys can become inactive following account security changes. Log in to BigONE, check the key status under Settings -> API Keys, and regenerate if inactive. Update the new credentials in KoinX under Integrations -> BigONE -> Edit.
Wrong permissions were selected during API creation
Wrong permissions were selected during API creation
Delete the existing key from BigONE -> Settings -> API Keys, generate a new key with read-only permissions only, and reconnect in KoinX with the new credentials.
KoinX is showing duplicate BigONE transactions
KoinX is showing duplicate BigONE transactions
Check KoinX -> Integrations for duplicate BigONE connections and remove any extras. If a file was previously uploaded for the same period, delete those transactions before re-syncing via API.
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Connect Bitget via Tax API Key or Normal API Key.
OKX Integration
Sync OKX trades and earn history via API or CSV.
Ready to generate your BigONE crypto tax report?
Create a free KoinX account - no credit card required. Import your BigONE transactions and generate a country-specific tax report in minutes.