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CrocQuery Example ​

Say for example you wanted to query the price of WBERA relative to HONEY in this pool: https://bartio.bex.berachain.com/pool/0xd28d852cbcc68dcec922f6d5c7a8185dbaa104b7.

Let's walk through the steps to accomplish this using the CrocQuery contract, using Foundry's cast CLI. Specifically, we will be calling the queryPrice method.

1. Get the poolIdx ​

bash
cast call --rpc-url https://bartio.rpc.berachain.com/ 0xd28d852cbcc68DCEC922f6d5C7a8185dBaa104B7 "poolType()"

# [Example Output]:
# 0x0000000000000000000000000000000000000000000000000000000000008ca0
# (Equals 36000 in decimals)

2. Get base and quote tokens (shortened to the 20-byte address standard) ​

bash
cast call --rpc-url https://bartio.rpc.berachain.com/ 0xd28d852cbcc68DCEC922f6d5C7a8185dBaa104B7 "baseToken()" | sed 's/^0x//' | sed 's/^.\{24\}/0x/'

# [Example Output]:
# 0x0e4aaf1351de4c0264c5c7056ef3777b41bd8e03
# (HONEY)
bash
cast call --rpc-url https://bartio.rpc.berachain.com/ 0xd28d852cbcc68DCEC922f6d5C7a8185dBaa104B7 "quoteToken()" | sed 's/^0x//' | sed 's/^.\{24\}/0x/'

# [Example Output]:
# 0x7507c1dc16935b82698e4c63f2746a2fcf994df8
# (WBERA)

3. Call queryPrice on CrocQuery contract ​

Now, we have the arguments we need to call the queryPrice function:

bash
cast call --rpc-url https://bartio.rpc.berachain.com/ 0x8685CE9Db06D40CBa73e3d09e6868FE476B5dC89 'queryPrice(address,address,uint256)' 0x0e4aaf1351de4c0264c5c7056ef3777b41bd8e03 0x7507c1dc16935b82698e4c63f2746a2fcf994df8 36000

# [Example Output]:
# 0x00000000000000000000000000000000000000000000000791d612f8eb363f2a
# (Equals 139635816156789882666 in decimals)

This returns the square root price which we may wish to decode to a more human-readable format.

4. Decode the Q64.64 square root price ​

Any appropriate method could be used to decode the Q64.64 square root price. The general formula is as follows:

javascript
const sq = x / 2 ** 64;
const price = sq * sq;

where x is the Q64.64 square root price.

Thus, in our example, we have:

sq = 139635816156789882666 / 2 ** 64 = 7.56967276

price = 7.56967276 * 7.56967276 = 57.3 HONEY/WBERA