# OANDA API error: HTTP 401 (invalid or missing token)

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This is the markdown version of https://openbrokerapi.com/errors/oanda/401-invalid-or-missing-token, written from the same records as that page.

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The error, as text you can copy:

```
HTTP 401 (invalid or missing token)
```

- Kind: API error code
- HTTP status: 401
- API: [OANDA](https://openbrokerapi.com/brokers/oanda)
- Status: verified. Source: [developer.oanda.com](https://developer.oanda.com/rest-live-v20/troubleshooting-errors/), checked 2026-09-19.

## What does HTTP 401 (invalid or missing token) mean on the OANDA API?

The access token is invalid or missing.

## How do I fix HTTP 401 (invalid or missing token)?

Send Authorization: Bearer YOUR_TOKEN on every request and regenerate the token if it was revoked.

## More on the OANDA API

- [All OANDA API error codes](https://openbrokerapi.com/errors/oanda)
- [OANDA API quickstart](https://openbrokerapi.com/brokers/oanda/quickstart): From credentials to a first call on a demo account, step by step.
- [OANDA API error codes](https://openbrokerapi.com/errors/oanda): 242 decoded, each with what it means, and the fix where the source gives one.
- [OANDA API endpoints](https://openbrokerapi.com/brokers/oanda/endpoints): 33 documented, each with its method, path, parameters and source.
- [OANDA API page](https://openbrokerapi.com/brokers/oanda): The full record: access, authentication, limits and the source for each.
- [Get your OANDA trade history into a spreadsheet](https://openbrokerapi.com/guides/oanda-trade-history): Guide

## Licence and how to cite

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Cite as: OANDA API error: HTTP 401 (invalid or missing token). Broker API Hub, https://openbrokerapi.com/errors/oanda/401-invalid-or-missing-token, newest check 2026-09-19.

Where you rely on a single figure, cite the source and the checked date printed beside it as well. Where this page and a broker's own documentation differ, the documentation wins.