BETS/wstETH pool not returning bptPrice about balancer-sdk

[lgahdl]

The bptPrice function is fetching 88 tokens at the same time, the max allowed by coingecko is 10

[RomualdH]

The bptPrice function is fetching 88 tokens at the same time, the max allowed by coingecko is 10

Is there a way to fetch only one?

[lgahdl]

Yeah, but to find this bpt price, our flow is fetching prices for 88 tokens, so I separated our coingecko requests into chunks of 10, because now they have paid plan and free plan, and the free plan can fetch only 10 tokens per request :/
Info: https://www.coingecko.com/en/api/pricing

{
	"timestamp": "2023-11-28T20:54:17.207+00:00",
	"error_code": 10012,
	"status": {
		"error_message": "Number of contract addresses in the request exceeds the allowed limit (10 addresses). Please note that to ensure fair usage and prevent abuse, the allowed limit may be adjusted periodically. To enjoy higher allowed limit, please subscribe to Demo plan or a paid plan at https://www.coingecko.com/en/api/pricing"
	}
}

[RomualdH]

so I separated our coingecko requests into chunks of 10

Thanks for your answer @lgahdl!
Is it published so that we could update the package?

[brunoguerios]

@RomualdH - it's published on the new beta package here

[brunoguerios]

@RomualdH - in case you're using the SDK instead of the SOR directly, you can find the change here

[RomualdH]

@RomualdH - in case you're using the SDK instead of the SOR directly, you can find the change here

Hi @brunoguerios, seems now the error is Error fetching token prices from coingecko with status 429
My snippet is:

price = await balancer.pools.bptPrice(
  await balancer.pools.find('0x26cc136e9b8fd65466f193a8e5710661ed9a98270002000000000000000005ad')
)

[brunoguerios]

Thanks for reporting @RomualdH - I created a new issue so we can keep track of it. We'll get to it as soon as possible.

[lgahdl]

Hi @RomualdH, the coingecko API reduced their rate limit to 5 instead of 30 requests per minute today, I added a new config to add coingecko API Key, if you have a paid plan you will be able to initialize the SDK with your coingecko API Key:

const balancerSDK = new BalancerSDK({
  network: 1,
  rpcUrl: 'https://rpc.ankr.com/eth',
  coingecko: {
    coingeckoApiKey: 'YOUR_API_KEY',
    tokensPerPriceRequest: 30
  },
})

PR: #557

[RomualdH]

if you have a paid plan

Hi @lgahdl, is there a way to calculate the bpt price based on its underlaying tokens?

[brunoguerios]

Hi @lgahdl, is there a way to calculate the bpt price based on its underlaying tokens?

@RomualdH - if you look at the implementation within the SDK you'll see that it uses the underlying token prices to calculate the bptPrice. Is that what you mean?

[RomualdH]

Hi @lgahdl, is there a way to calculate the bpt price based on its underlaying tokens?

@RomualdH - if you look at the implementation within the SDK you'll see that it uses the underlying token prices to calculate the bptPrice. Is that what you mean?

Yes, but why do we need the price feed from CG if we have the weight of each token in the pool? That wouldn't be enough to calculate the price?

[brunoguerios]

Yes, but why do we need the price feed from CG if we have the weight of each token in the pool? That wouldn't be enough to calculate the price?

No, it's not enough. Price in the end means USD value. You need each token USD value + weight to calculate the bptPrice.

[RomualdH]

No, it's not enough. Price in the end means USD value. You need each token USD value + weight to calculate the bptPrice.

Can't I calculate wstETH price from it's wstETH/USDC pool, and then BETS price from wstETH/BETS pool based on the number of tokens weight (8020)?
Or maybe do a swap simulation from the BPT to USDC to know the price?

[brunoguerios]

Can't I calculate wstETH price from it's wstETH/USDC pool, and then BETS price from wstETH/BETS pool based on the number of tokens weight (8020)? Or maybe do a swap simulation from the BPT to USDC to know the price?

You sure can 👍
The USD value approach is the one that we use and is suited for a more generalized solution.
If you're interested in a single specific BPT price, you can use any of those options you mentioned.
Please keep in mind that they are estimates based on the pools you're querying. If these pools happen to be out of balance compared to the current market price, the estimates will be off.
Although I believe estimates should be quite good as long as the pools you're querying have deep liquidity.

[RomualdH]

Do you have a snippet to help me calculate it please?

[RomualdH]

I managed to do it with APIs and this formula (BETS.balance * BETSPrice + wstETH.balance * wstETHPrice) / pool.totalShares.