Alter vs Auth0 for AI agents
Auth0 is an identity platform: it authenticates people, issues tokens, and since Auth0 for AI Agents went generally available it also stores third-party tokens for agents to use. If you need customer login, Auth0 is a serious product and Alter is not a replacement for it.
The difference shows up after authentication. With Token Vault, your application exchanges an Auth0 token for the external provider's access token, and then your application calls the provider. Auth0 is not on that outbound request, so it cannot see the endpoint, the parameters, or the response.
Alter sits in the request path. The agent calls Alter, Alter evaluates policy against the actual request, injects the credential, makes the call, and records what happened. The agent never holds the token.
That is the whole comparison. The rows below are consequences of it, not separate features.
Alter and Auth0, capability by capability
Every mark that is not a plain yes carries the sentence that explains it and a link to Auth0's own documentation.
| Capability | Alter | Auth0 |
|---|---|---|
| Credentials | ||
| Injects the credential into the outbound call | Partial Token Vault stores the external provider's access and refresh tokens and exchanges them back to your application, which then makes the call itself. The credential is brokered to your code rather than injected on the way out. Source (opens in a new tab) | |
| The agent never holds the third-party token | — The exchange returns the provider's access token to the application, so whatever code calls the provider — including an agent — holds it. Source (opens in a new tab) | |
| Providers supported out of the box | 137 | Catalog, 9 named Token Vault's page names nine connection types as examples — Google, Microsoft, Box, Slack, GitHub, custom social, Google Workspace, Microsoft Entra ID and OpenID Connect — then points at Auth0 Integrations for the full list. Nine is not their total, and this page has not counted the catalog. Source (opens in a new tab) |
| Policy | ||
| Policy evaluated per outbound call, down to the parameter | — Auth0 is not in the request path to the third-party API, so there is no point at which it could evaluate that call's endpoint or parameters. Scope is decided when the token is issued. Source (opens in a new tab) | |
| Default deny: an unlisted endpoint is refused | Partial Scopes bound at issuance restrict what a token may do, which is a real control. It is not per-request: anything the scope permits is permitted every time, for the life of the token. Source (opens in a new tab) | |
| Control | ||
| A named human approves a specific pending call before it runs | Partial CIBA with Rich Authorization Requests does put the transaction in the consent prompt — Auth0's worked example confirms a payment amount — so the approver sees the arguments. Auth0 then validates a RAR object no further than its type, makes the resource server responsible for the content, and is not on the call, so nothing checks that what executes is what was approved. Enterprise plan or add-on. Source (opens in a new tab) | |
| Each agent is a distinct principal with its own keys | ||
| Revoking one agent cuts its access without rotating others | Partial Revoking the stored grant stops future exchanges. An access token already handed to your application stays valid until it expires, because Auth0 is not in the path to reject its use. Source (opens in a new tab) | |
| Evidence | ||
| An audit row for every credential-touching request | — Auth0 logs the events it handles — logins, exchanges, consent. It cannot log the provider calls your application makes with the token, having never seen them. Source (opens in a new tab) | |
| End users can see and revoke what an agent may do for them | Partial Connected Accounts lets a user link and unlink external providers. What an agent did with that access afterwards is not something Auth0 observes. Source (opens in a new tab) | |
Comparison accurate as of September 18, 2026, based onAuth0's public documentation. Products change: if something here is out of date, tell us athello@alterauth.com and we will correct it.
- Auth0 Docs: Token Vault (opens in a new tab) — read September 18, 2026
- Auth0 Docs: Token Vault, supported external providers (opens in a new tab) — read September 18, 2026
- Auth0 Docs: User Authorization with CIBA (opens in a new tab) — read September 18, 2026
Auth0 is a trademark of Okta, Inc.. Alter is not affiliated with or endorsed by Okta, Inc..
Token exchange versus a request path
Auth0's model is an exchange: your application presents an Auth0 token and receives the provider's access token, then calls the provider. Alter's model is a proxy: the agent asks Alter to make the call, and Alter decides, injects, calls, and records. Neither is a better implementation of the other — they are different positions relative to the request, and every row in the table follows from which one you pick.
- Exchange: policy is whatever the token's scope allowed, decided once at issuance.
- Request path: policy sees this endpoint, these parameters, this agent, right now.
- Exchange: the calls your application makes are invisible to the identity provider.
- Request path: every call leaves an audit row whether it succeeded, was denied, or failed.
Who checks that the call matches the approval
Auth0's human-in-the-loop is stronger than a scopes-only account of it suggests. CIBA carries <code>authorization_details</code> into the consent prompt, so the person can be shown the amount and the beneficiary before approving, and Auth0's own worked example is confirming a payment. The difference is what happens next. Auth0 issues a token carrying those details, validates a RAR object no further than its type, and assigns the granular validation of the content to the resource server — after which your application makes the call, unobserved. Alter holds the pending request itself, so the thing that executes on approval is <strong>that request</strong>, with the endpoint and body the approver read.
When Auth0 is the better choice
A comparison that never reaches this section is a brochure.
Customer login, properly
Universal Login, enterprise connections, MFA and the rest of CIAM. Alter does not do human sign-in for your product, and if that is the problem you have, Auth0 is the answer.
One vendor for users and agents
If your users already live in Auth0, keeping agent identity beside them is a real consolidation argument, and their agent features are shipping quickly.
Standards depth
OpenID Connect, CIBA, token exchange — Auth0 implements the specifications thoroughly and contributes to them. Alter builds on the same standards rather than competing with them.
Questions people ask
Is Alter a replacement for Auth0?
No. Auth0 signs your users in; Alter governs what your agents do with third-party credentials afterwards. Plenty of teams run both, with Auth0 as the identity provider and Alter in front of outbound calls.
Auth0 has Token Vault. Is that not the same as a credential vault?
Both store third-party tokens. The difference is what happens next: Token Vault returns the token to your application to use, and Alter keeps it and makes the call for you. That is why Alter can apply policy per call and log every one.
Can Alter use Auth0 as the identity provider?
Yes. Alter accepts OIDC identity providers, Auth0 included, so the human identity that authorizes a grant can be the one you already have.
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