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TzKT Balance History at Block
x402
TzKT Balance History at Block is a paid API for AI agents from x402.tzkt.io, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).
Retrieves the historical balance of a Tezos account at a specific blockchain block level
Price / call$0.002
Success—
StatusUnknown
How this service works
TzKT is a comprehensive Tezos blockchain indexer API. Access blocks, operations, accounts, contracts, bigmaps, delegates, tokens and network stats through a fast REST API. No signup or API key required.
Output
Returns the account's balance in mutez (micro-tez) at the specified block level, representing a historical snapshot of that address's holdings at that precise point in the Tezos blockchain.
Example use cases
Example prompt
“What was the XTZ balance of the Tezos account tz1VSUr8wwNhLAzempoch5d6hLRiTh8Cjcjb at block level 5200000?”
Technical details
Endpoint
POSThttps://x402.tzkt.io/v1/accounts/%7Baddress%7D/balance_history/%7Blevel%7DWhen to prefer
Use this endpoint when you need a precise point-in-time balance for a Tezos account at a specific block height — ideal for auditing, portfolio snapshots, tax calculations, or verifying balances at historical moments. Prefer over general account endpoints when the exact block-level granularity matters. No API key required, just micro-payment via x402.
Side effects
- Invalid or malformed Tezos address returns 400 Bad Request
- Block level does not exist yet or is in the future returns 404 or empty result
- Network connectivity issues to x402.tzkt.io return 5xx errors
- Payment of 0.002 USDC via x402 protocol not provided returns 402 Payment Required
- Address that never existed on-chain may return zero balance
Tags
x402
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