Returns the allowance for a given ERC20 token, owner, and spender
Parameters
chain_id
(uint64, default: 1)token_address
(address as hex string, default: 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48)owner
(address as hex string, default: 0x48D004a6C175dB331E99BeAf64423b3098357Ae7)spender
(address as hex string, default: 0x39AA39c021dfbaE8faC545936693aC917d5E7563)block_number
(uint64, default: 0)- Optional. Can be used to view allowances at a particular block. If unset, defaults to
0
and returns latest.
- Optional. Can be used to view allowances at a particular block. If unset, defaults to
Returns
amount
(int256 as decimal string)- The amount of the allowance normalized with token_decimals. Note that many contracts treat the max value of uint256 (~1.1579×10^77) as an unlimited allowance that doesn't decrement when the spender uses it.
txn_last_changed
(address as hex string)- The most recent transaction that impacted the balance.
block_last_changed
(int64)- The most recent block that impacted the balance.
Query
WITH latest_block_number AS (
SELECT token_address,
owner,
spender,
MAX(block_number) AS latest_block_number
FROM @sim.erc20_allowance_changes_block
WHERE chain_id = $chain_id
AND token_address = lower($token_address)
AND owner = lower($owner)
AND spender = lower($spender)
AND (
block_number <= $block_number
OR $block_number = 0
)
GROUP BY token_address,
owner,
spender,
chain_id
)
SELECT (1.0 * a.allowance / POWER(10, a.token_decimals)) AS allowance,
a.txn_hash as txn_last_changed,
a.block_number as block_last_changed
FROM @sim.erc20_allowance_changes_block a
INNER JOIN latest_block_number lbn ON a.block_number = lbn.latest_block_number
WHERE a.token_address = lower($token_address)
AND a.owner = lower($owner)
AND a.spender = lower($spender)
AND a.chain_id = $chain_id