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Tax API

Onchain Data for Tax Software

Expand your coverage in 2025 with enterprise-grade data for cross-chain tax reporting

Market-leading historical token price coverage across 60+ chains
Transaction history, asset deltas, and filters to isolate income events
Token balances and DeFi positions
NFT valuations, transfers, and sales
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Save Development Time

Eliminate the need to build and maintain complex data indexing and parsing systems. Our API provides pre-processed, ready-to-use data across 60+ chains, saving you months of development time.

Industry-Leading Data Quality

Benefit from our 5+ years of experience building consumer-facing crypto products. The same high data quality standards that power our user-facing applications ensure reliability for your clients.

Industry-Leading Coverage

Comprehensive data across chains, tokens, and asset types

60+
Chains Supported
4.2M+
Tokens with Historical Prices
3.8M+
Price Sources
51.9M
Estimated NFT Valuations
Price Data

Historical Price Data

Access historical prices for the broadest coverage of tokens on the market, essential for capital gains calculations.

Prices for over 4.2M tokens
Historical data at any timestamp
Based on real-time onchain markets

Historical Prices for Tax Calculations

ETH
Ethereum
ETH
$2,621.54
+2.84%
Historical Prices Available
At Transaction
Daily Close
Year-end
Custom Date
Transaction History

Complete Transaction History

Access complete transaction histories with powerful filters and detailed asset movements for accurate reporting.

Filter transactions by tax year
Identify taxable events with category filters
Detailed asset deltas for every transaction
Account abstraction support

Transaction History

Tax Year 2025
swapEthereum
Swapped 0.195 ETH for 355.81 USDC
2025-04-21Taxable
+$14.38
nft_saleEthereum
Sold Lil Pudgy #10407 for 1.1 ETH
2025-01-29Taxable
+$1,372.42
transferBase
Received 0.5 ETH from 0xjasper.eth
2025-03-15Non-taxable
View all 253 transactions →
Portfolio

Token Balances

Access token holdings across different networks with real-time computation built in.

Total portfolio value in USD
Native token balances across chains
Token metadata and prices
Network and account breakdowns

Token Portfolio

Tax Year 2025
$191,519.43
Total Value
ETH
Base
ETH
17.286
$45,317.03
12 tax events
USDC
Base
USDC
30,100
$30,100.00
8 tax events
SYNDOG
Base
SYNDOG
30,000,000
$38,615.10
3 tax events
DeFi

DeFi Balances

View positions within onchain applications like lending protocols, DEXes, liquidity pools, and more.

App positions across protocols
Detailed protocol metadata
Position values and underlying tokens
Lent, borrowed, and staked assets

DeFi Positions

Yield & Staking Income
$2,354.77
15 positions
Morpho
Base
Morpho
ionicUSDC
$1,078.49
+$42.30 income
Aave v3
Base
Aave v3
2 positions
$632.74
+$18.92 income
Uniswap v3
Ethereum
Uniswap v3
ETH/USDC LP
$643.54
+$156.78 income
NFT

NFT Valuations

Complete NFT data with estimated valuations, and sale history.

Trait-based valuation model
Floor prices and offers from top marketplaces
Metadata, transfers, and sales history

NFT Collection

Estimated Value: $7,623.45
4 sales events
Lil Pudgy #10407
Lil Pudgy #10407
$2,671.70
+$1,372.42 gain/loss
Aftermath #2834
Aftermath #2834
$458.74
-$12.30 gain/loss
onchain gaia #0
onchain gaia #0
$965.33
+$265.33 gain/loss
Doodle #4552
Doodle #4552
$199.34
+$50.12 gain/loss
Analytics

Portfolio Totals

Get consolidated portfolio values with detailed breakdowns across networks and asset types.

Total portfolio value across all assets
Network distribution breakdown
Token vs DeFi vs NFT allocation
Account-level contributions
Total Portfolio Value
$292,328.83
Total Tax Events
125
Asset Distribution & Tax Events
Tokens
$191,519.4389 events
DeFi
$2,354.7724 events
NFTs
$98,454.6312 events
Capital Gains
+$42,387.21
Income Events
+$7,854.93

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