CoreWeave Webhooks & Events

Overview

CoreWeave emits Kubernetes-native events and custom status callbacks for GPU workload lifecycle management. Monitor instance readiness, job completion, volume attachment, and node health to build automated scaling, alerting, and recovery pipelines for GPU-accelerated inference and training workloads.

Webhook Registration

const response = await fetch("https://api.coreweave.com/v1/webhooks", {
  method: "POST",
  headers: {
    "Authorization": `Bearer ${process.env.COREWEAVE_API_KEY}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    url: "https://yourapp.com/webhooks/coreweave",
    events: ["instance.ready", "job.completed", "volume.attached", "node.unhealthy"],
    secret: process.env.COREWEAVE_WEBHOOK_SECRET,
  }),
});

Signature Verification

import crypto from "crypto";
import { Request, Response, NextFunction } from "express";

function verifyCoreWeaveSignature(req: Request, res: Response, next: NextFunction) {
  const signature = req.headers["x-coreweave-signature"] as string;
  const timestamp = req.headers["x-coreweave-timestamp"] as string;
  const payload = `${timestamp}.${req.body.toString()}`;
  const expected = crypto.createHmac("sha256", process.env.COREWEAVE_WEBHOOK_SECRET!)
    .update(payload).digest("hex");
  if (!crypto.timingSafeEqual(Buffer.from(signature), Buffer.from(expected))) {
    return res.status(401).json({ error: "Invalid signature" });
  }
  next();
}

Event Handler

import express from "express";
const app = express();

app.post("/webhooks/coreweave", express.raw({ type: "application/json" }), verifyCoreWeaveSignature, (req, res) => {
  const event = JSON.parse(req.body.toString());
  res.status(200).json({ received: true });

  switch (event.type) {
    case "instance.ready":
      registerEndpoint(event.data.instance_id, event.data.gpu_type); break;
    case "job.completed":
      collectArtifacts(event.data.job_id, event.data.output_path); break;
    case "volume.attached":
      mountStorage(event.data.volume_id, event.data.node_name); break;
    case "node.unhealthy":
      drainAndReschedule(event.data.node_id, event.data.reason); break;
  }
});

Event Types

Event	Payload Fields	Use Case
instance.ready	instance_id, gpu_type, ip_address	Register inference endpoint
job.completed	job_id, output_path, duration_seconds	Collect training artifacts
volume.attached	volume_id, node_name, mount_path	Confirm storage availability
node.unhealthy	node_id, reason, gpu_count	Drain node and reschedule pods
instance.terminated	instance_id, exit_code, gpu_type	Clean up resources and alert

Retry & Idempotency

const processed = new Set<string>();

async function handleIdempotent(event: { id: string; type: string; data: any }) {
  if (processed.has(event.id)) return;
  await routeEvent(event);
  processed.add(event.id);
  if (processed.size > 10_000) {
    const entries = Array.from(processed);
    entries.slice(0, entries.length - 10_000).forEach((id) => processed.delete(id));
  }
}

Error Handling

Issue	Cause	Fix
Signature mismatch	Clock skew between clusters	Validate timestamp within 5-minute window
Duplicate instance.ready	Rescheduled pod on same node	Track instance IDs for deduplication
Stale node.unhealthy	Transient GPU memory error	Wait for consecutive events before draining
Missing output_path	Job failed before writing	Check exit_code before collecting artifacts

Resources

• CoreWeave Kubernetes Docs

Next Steps

See coreweave-security-basics.