RPC method

debug_traceCall on Flare

Supported on SwiftNodes

Measured 2026-10-11 by our weekly probe, which calls debug_traceCall through the same Flare endpoint customers use.

What debug_traceCall does

Executes a call against a block's state and returns its execution trace (with a tracer such as callTracer), without sending a transaction. It is the standard way to see what a call would do internally before you submit it.

Example request

curl -s https://rpc.swiftnodes.io/rpc/flare?key=YOUR_API_KEY \
  -X POST -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":1,"method":"debug_traceCall","params":[{"to":"0x0000000000000000000000000000000000000000","data":"0x"},"latest",{"tracer":"callTracer"}]}'

import { createPublicClient, http } from "viem";

const client = createPublicClient({ transport: http("https://rpc.swiftnodes.io/rpc/flare?key=YOUR_API_KEY") });

// Any JSON-RPC method, typed loosely: debug_traceCall on Flare
const result = await client.request({
  method: "debug_traceCall",
  params: [{"to":"0x0000000000000000000000000000000000000000","data":"0x"},"latest",{"tracer":"callTracer"}],
});

Other methods on Flare

debug_traceCall on other chains

Support differs by chain; the full measured table is on the debug_traceCall reference.

Frequently asked questions

Does Flare support debug_traceCall?

Yes. debug_traceCall answered correctly on the SwiftNodes Flare endpoint in our weekly method probe (2026-10-11), which sends real requests through the customer path.

Flare endpoints, live block height and WebSocket status are on the Flare RPC page.

One key covers every chain we serve, and SwiftNodes has a free tier.