Multi-chain wallets
Track EVM (Ethereum and its L2s), Bitcoin, and Solana wallets from a single endpoint. Balances come straight from on-chain data.
Qeychain API
Track wallets across Ethereum, Bitcoin, and Solana. Compute FIFO cost basis. Export IRS Form 8949 and Schedule 1. All over a REST API.
Build on Qeychain
Section titled “Build on Qeychain”The Qeychain API turns on-chain wallet activity into advisor-ready portfolio and tax data. Point it at a wallet address and get back current holdings, full transaction history, cost basis, and finished IRS tax forms — no indexing infrastructure to run yourself.
Cost basis & tax
FIFO cost-basis engine with Form 8949, Schedule 1, and TurboTax TXF exports — short/long-term splits handled to IRS calendar rules.
Transactions & lineage
Classified transaction history with filters and CSV/JSON export, including money-trail lineage across swaps and bridges.
Auto-synced reference
The API reference is generated from the live service, so it always matches the deployed endpoints and schemas.
Start here
Section titled “Start here”QuickstartAuthenticate and make your first calls in five minutes.
AuthenticationHow to authenticate requests to the API.
Supported chains & walletsExactly which chains and address formats are supported.
Tax reportingGenerate Form 8949, Schedule 1, and tax summaries.
API ReferenceEvery endpoint, parameter, and response — generated from the code.
Response formatThe standardized v1 response envelope and pagination.