Detect chains that dont support PUSH0

detect-push0-support.js

async function detectPush0Support(rpcs) {
    return (await Promise.all(rpcs.map(async rpc => {
        try {
            const res = await fetch(rpc, {
                method: "POST",
                headers: {
                    "Content-Type": "application/json"
                },
                body: JSON.stringify({
                    "method": "eth_call",
                    "params": [
                        {
                            "from": null,
                            "data": "0x604260005260205FF3"
                        },
                        "latest"
                    ],
                    "id": 1,
                    "jsonrpc": "2.0"
                })
            }).then(r => r.json())
            if (res.result !== "0x0000000000000000000000000000000000000000000000000000000000000042") {
                return rpc
            }
        } catch (e) {
            console.log("error", rpc, String(e))
        }
    }))).filter(Boolean)
}

detectPush0Support([
    "https://arb1.arbitrum.io/rpc",
    "https://rpc.ankr.com/optimism",
    "https://rpc.ankr.com/polygon",
    "https://rpc.ankr.com/avalanche",
    "https://rpc.ankr.com/fantom",
]).then(failedRpcs => console.log("Chains with no PUSH0 support: ", failedRpcs))