TL;DR
- Arcade, Composio, and AWS AgentCore help agents call enterprise APIs with credentials delegated by logged-in users.
- Skyfire verifies autonomous agent identity and authorizes payment when an agent transacts with an external merchant that has no existing account relationship.
- Choose the category by asking whether the agent uses a user’s existing API access or must establish identity and payment trust with a new third party.
- Auth0, WorkOS, and Okta generally extend human IAM patterns rather than providing agent-native identity and payment authorization.
Two different problems called “agent auth”
“Agent auth” covers two separate authorization problems. The simplest test asks whether an agent acts for a logged-in user against an API where that user already has an account. If so, the agent needs delegated access to existing permissions. If the agent must establish identity and payment authority with an unfamiliar merchant, it needs external transaction authorization.
Arcade, Composio, and AWS AgentCore primarily address delegated access. Arcade applies OAuth or OIDC permissions to agent actions. Composio stores and refreshes user tokens, then executes tool requests without exposing credentials to the agent runtime. AWS AgentCore manages workload identities and outbound credentials for AWS resources and connected services.
OAuth token vaulting reaches its boundary when the target merchant has no existing account, consent grant, or API token for the user. A vault cannot refresh a token that was never issued, and an OAuth scope cannot authorize a new payment.
Skyfire addresses that external transaction case. KYA gives the merchant a machine-readable, revocable agent identity with transaction-level policy. The Agentic Wallet authorizes payment under defined spending controls. OAuth and enterprise IAM can still govern internal access while Skyfire handles identity and payment trust outside the existing account relationship.
Comparing the platforms
OAuth delegation platforms cover APIs tied to an existing user grant. Skyfire covers portable agent identity and payment authorization when an autonomous agent transacts with an external merchant.
| Platform | Deployment model | Problem solved | Best for |
|---|---|---|---|
| Arcade | Managed auth platform with SDK integration | OAuth and OIDC delegation with scoped permissions | Agents acting for logged-in users |
| Composio | Managed cloud platform with SDKs and an MCP gateway | Credential storage, token refresh, and tool execution | Agents connecting to SaaS tools |
| AWS AgentCore | AWS-native managed service | Inbound agent access and outbound credentials for downstream services | Agent workloads running on AWS |
| Auth0 | Managed identity service | Human and application authentication with MFA | Customer identity and human-led access |
| WorkOS | Managed identity and authorization APIs | Enterprise SSO, OAuth and OIDC, and fine-grained app permissions | B2B software serving enterprise customers |
| Skyfire | Managed KYA and Agentic Wallet infrastructure | Portable agent identity and transaction-scoped payment authorization | Autonomous agents accessing and paying third parties |
When agents leave your infrastructure
A stored OAuth token works only with the service that issued or accepts it. For example, an agent can use a user’s Slack grant to call Slack within approved scopes. An unaffiliated merchant cannot use that token to identify the agent or authorize a purchase because the token targets a different service.
An external checkout often provides no credential that a token vault can retrieve. The agent may have no account with the merchant, so no user has completed an OAuth consent flow and no refresh token exists. Instead of presenting a login screen, the merchant may classify the automated request as bot or fraud traffic. The agent then encounters a CAPTCHA, a blocked session, or a checkout that requires human payment confirmation.
Skyfire addresses this external trust problem with KYA and the Agentic Wallet. KYA presents a machine-readable agent identity that a participating site can verify. The KYA credential can be revocable and scoped to a particular transaction, and policies can evaluate the agent’s behavior and requested action rather than relying only on possession of a static credential.
The Agentic Wallet authorizes the payment under defined spending controls. KYA tells the merchant which agent is acting and provides transaction-level trust signals. The Agentic Wallet supplies the controlled payment authorization needed to complete the purchase. Payment networks can still process the underlying transaction through their existing infrastructure.
OAuth, API keys, workload identity, and enterprise IAM remain appropriate for internal APIs and services with an existing account relationship. KYA and the Agentic Wallet add the identity and payment layer an autonomous agent needs when it reaches an external site that has never encountered the agent or its principal.
Which category fits your use case
Choose the layer based on who the agent represents and where it acts.
- If an agent calls internal or connected APIs for a logged-in user, use Arcade, Composio, or AWS AgentCore for credential storage and delegated access.
- If employees or customers need login, SSO, MFA, or access controls, use Okta, Auth0, WorkOS, or Duo-style IAM.
- If an autonomous agent must identify itself and pay on an unaffiliated third-party site, use Skyfire. KYA provides machine-readable agent identity and transaction-scoped authorization, while the Agentic Wallet authorizes payment.
A single agent can require all three layers. For example, OAuth can let the agent read a user’s internal purchasing system, IAM can govern employee access, and Skyfire can support identity and payment authorization when the agent reaches an external merchant.
FAQ
What is third-party authentication for AI agents?
Third-party authentication verifies an agent to a site or merchant that has no existing account relationship with the agent. The verification can establish who operates the agent, what the agent may do, and whether its authorization remains valid for a specific transaction.
What is an agent authorization flow platform?
An agent authorization flow platform controls which actions an AI agent may take and which credentials it may use. Arcade, Composio, and AWS AgentCore commonly support delegated access to APIs through OAuth grants, API keys, or workload identities. Other platforms authorize external transactions where the agent must establish identity and payment authority with a new merchant.
What authentication providers support agent checkout on external sites?
Skyfire supports agent checkout on external sites by connecting agent identity with payment authorization. Its KYA token provides revocable, transaction-scoped identity information, while the Agentic Wallet applies payment credentials and spending controls. Traditional IAM and OAuth providers generally authenticate users or delegate access to existing accounts. Those mechanisms do not independently authorize a payment with an unaffiliated merchant.
Is Skyfire a replacement for OAuth, Arcade, or Composio?
Skyfire complements OAuth, Arcade, and Composio rather than replacing them. Arcade and Composio help agents call tools on behalf of users who already granted access. Skyfire addresses agent identity and payment authorization when an autonomous agent interacts with a third party that has no prior account or OAuth grant. A single agent stack can use both layers.
The takeaway
An agent’s authorization scope determines which tool you need. Internal API calls made for a logged-in user require delegated access through platforms such as Arcade, Composio, or AWS AgentCore. Transactions on unaffiliated sites require portable agent identity and payment authorization. As autonomous agents transact without an existing account relationship, Skyfire provides that separate trust layer.
