Crypto tax and accounting API

Used by EY, Awaken Tax and Crypto Tax Calculator

Inside a historical balances response

A historical balances call returns every token an address held on the date you pass, each priced that day. Three fields carry a year-end valuation: the block the balances were read at, the price, and the value. Here is the Ether item from the call behind the panel above, and what to do with each.

1{2  "contract_decimals": 18,3  "contract_name": "Ether",4  "contract_ticker_symbol": "ETH",5  "contract_address": "0xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee",6  "block_height": 24128884,17  "is_native_token": true,8  "type": "cryptocurrency",9  "is_spam": false,10  "balance": "119077849440095085",11  "quote_rate": 2892.5405,212  "quote": 344.4375,313  "pretty_quote": "$344.44"14}

Transactions classified for tax reporting

Add with-classification=true to a transactions call and every transaction comes back with a type, a category, a one-line description and the assets the wallet sent and received. Map the types to your tax events instead of writing a decoder for every protocol.

1// data.items[n].classification2{3  "type": "swap",4  "category": "defi",5  "description": "Swapped 872.59 AERO for 0.279091760280112109 WETH.",6  "sent": [7    { "action": "token_sent", "amount": "872.59", "token": { … } },8    { "action": "paid_gas", "amount": "0.0000…", "token": { … } }9  ],10  "received": [11    { "action": "token_received", "amount": "0.2790…", "token": { … } }12  ]13}

1# Two query parameters on the paginated transactions endpoint2GET /v1/{chainName}/address/{walletAddress}/transactions_v3/page/{page}/3    ?with-classification=true&with-internal=true

Crypto transaction history API for tax

Each step of a tax or accounting workflow maps to an endpoint or two. Credit costs are per call unless a row says per item.

• Complete history, internal transfers included

  Page through every transaction an address made, oldest first if you need it. with-internal=true adds internal transfers, the ETH that moves inside contract calls, and with-classification=true labels each transaction as a swap, a send or a receive. Both work on select EVM chains.

  • Paginated transactions0.1 credits per item
  • Internal transfers+0.05 credits per item
  • Transaction classification+0.05 credits per item
  • Cross-chain transactions0.25 credits per item

• Historical prices for cost basis

  Look up a token's daily price over any date range, in any of 16 fiat currencies, to value each acquisition and disposal on the day it happened. Token transfers come back with the price at the time.

  • Historical token prices1 credit
  • ERC-20 transfers0.05 credits per item

• Balances on any date or block

  Read every token an address held at a block height or on a date, priced that day, for year-end statements and period-end close. Block heights turns a date range into the blocks it spans.

  • Historical token balances1 credit
  • Block heights1 credit

• Bitcoin wallets and xPubs

  Read the balance of every address derived from an xPub, yPub or zPub, the transactions of a single Bitcoin address, and a Bitcoin balance on a past date, with the same API key.

  • Bitcoin HD wallet balances0.1 credits per item
  • Bitcoin transactions0.1 credits per item
  • Historical Bitcoin balance1 credit

• Reconciliation across chains

  Find every chain an address has used in one call, then get each chain's transaction count and first and last transaction, so a client's ledger can be checked chain by chain.

  • Address activity0.5 credits
  • Transaction summary1 credit

Crypto tax API: GoldRush vs Moralis

Both return decoded wallet history with internal transactions and balances on past dates. The differences are chain coverage, how usage is billed, and how agents pay.

Sources: Moralis wallet history API, GoldRush vs Moralis, paginated transactions and Bitcoin HD wallet balances.

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Every account starts with a 14-day free trial: 25,000 API credits and 4 requests per second, with no credit card. A historical balances call costs 1 credit, so the trial covers 25,000 year-end snapshots. Paid plans start at $10 a month.