[Application Development] Gas oracle returns 0 base fees

[bejitono]

Did you check the documentation?

• Yes

Did you check for duplicate questions?

• Yes

Issue Description

We are doing an eth_call to read the baseFee from the gas oracle contract 0x420000000000000000000000000000000000000F which has worked fine until today but is now returning a base fee of 0. We're doing the same on Base which currently works fine.

Additional Information

Example request:
{"method":"eth_call","params":[{"data":"0x6ef25c3a","to":"0x420000000000000000000000000000000000000f"},"latest"],"jsonrpc":"2.0","id":1}

Feedback

No response

[Chomtana]

It seem to be working on my call...

[bejitono]

hm it's still returning {"jsonrpc":"2.0","id":1,"result":"0x0000000000000000000000000000000000000000000000000000000000000000"} on my end. I'm using https://opt-mainnet.g.alchemy.com/v2/{api_key} with the example request posted above fwiw.

[Chomtana]

It sometimes work sometimes not...

[sbvegan]

I've raised this internally, I'll make sure to relay back any information I find out.

[sbvegan]

Alright some of our client engineers did some digging and there has been a change in the behavior of upstream geth's rpc api. For these queries, you have to set a proper max gas price. See the following example of adding a gas price and getting the expected result:

soyboy@soyboys-MacBook-Air ~ % curl https://mainnet.optimism.io \
  -X POST \
  -H "Content-Type: application/json" \
  --data '{"method":"eth_call","params":[{"data":"0x6ef25c3a","to":"0x420000000000000000000000000000000000000f", "gasPrice":"0x1000000"},"latest"],"jsonrpc":"2.0","id":1}' | jq
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   263  100   103  100   160    414    644 --:--:-- --:--:-- --:--:--  1082
{
  "jsonrpc": "2.0",
  "result": "0x00000000000000000000000000000000000000000000000000000000004d01f4",
  "id": 1
}

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