We can check the fee history of any Skandha bundler, this will return a collection of historical gas prices for submitted userops. A sample request through curl like this can be used, with any Skandha bundler deployment being the endpoint. This can be run in any command line. skandha_feeHistory is the method. 
curl --location 'https://rpc.etherspot.io/v1/137' \
--header 'Content-Type: application/json' \
--data '{
    "id": 3,
    "method": "skandha_feeHistory",
    "params": [
        "0x5ff137d4b0fdcd49dca30c7cf57e578a026d2789",
        "15",
        "latest"
    ],
    "jsonrpc": "2.0"
}'
The skandha_feeHistory method accepts 3 params:
  • EntryPoint address: address of the entrypoint contract.
  • blockCount: Number of blocks in the requested range.
  • newestBlock: Highest number block of the requested range.
In return the bundler will return a collection of historical gas prices for submitted userops. A successful response will look like this: 
{
    "jsonrpc": "2.0",
    "id": 3,
    "result": {
        "actualGasPrice": [
            "0x307a7e7f36",
            "0x307a7e7f36",
            "0x2ff9dac0c4",
            "0x2e61367b3d",
        ],
        "maxFeePerGas": [
            "0x3f7de0dc1d",
            "0x3f7de0dc1d",
            "0x41c725f6d1",
            "0x3f322ffe26",
        ],
        "maxPriorityFeePerGas": [
            "0xcb2c6926c",
            "0xcb2c6926c",
            "0xd27d46490",
            "0xca3a332d4",
        ]
    }
}