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# v0 API returns 404 not_found_error with valid project ID and API key

32 views · 4 likes · 4 posts


Roblenderman 7762 (@roblenderman-7762) · 2026-03-22 · ♥ 1

## Problem
Trying to setup `v0` as an API provider in `Kilo Code`. Not sure why I cannot connect. Getting `404`. I have a premium `v0` account with $20 in credits. Trying this as a test.

## API Configuration
Correct API Format (from [v0 docs](https://v0.app/docs/api/platform/overview)):

```bash
POST https://api.v0.dev/v1/{projectId}/messages
Headers:
  Content-Type: application/json
  x-api-key: {key}
Body:
  {
    "prompt": "Hello, say test",
    "model": "v0-1.0-md"
  }
```

## Test Result
Test result with provided key:

- **Project ID:** `vc1AzC75fnpYUxLsqE1lmgDf`
- **Key:** `mykey`
- **Response:**

```json
{
  "error": {
    "type": "not_found_error",
    "message": "Not Found"
  }
}
```

## Summary
- ✅ Server reachable (no network error)
- ✅ Correct endpoint accepts requests
- ❌ Project/key combination not found (`404 Not Found`)

The API key/project ID appears invalid or inactive for the `v0` platform. The connection to the server works, but authentication failed for this specific credential.

Just upgraded 30 min ago. Logged out and in. Created a new key for this. Any advice is appreciated.


V1nc3nt (@v1nc3nt78) · 2026-03-22 · ♥ 2

I am trying to use the `v0 API` but I keep receiving a `404` error.

> **Error: not_found_error (404)**

I have tried with different browsers and different networks, but the error still appears even with a valid project ID and API key.


Andrew Ross (@dopaminedriven) · 2026-03-22

@roblenderman-7762 see this [thread](https://community.vercel.com/t/why-api-v0-dev-returns-404-when-requesting-v0-1-5-md-model/36447)


Andrew Ross (@dopaminedriven) · 2026-03-22 · ♥ 1

@v1nc3nt78 see this [thread](https://community.vercel.com/t/why-api-v0-dev-returns-404-when-requesting-v0-1-5-md-model/36447)