# SIMBA Blocks Authentication Service API

**Canonical:** https://apis.io/apis/simba-chain/simba-chain-authentication-api/  
**Provider:** SIMBA Chain — https://apis.io/providers/simba-chain/  
**Base URL:** https://blocks.simbachain.com/api/member-service-validator  
**Documentation:** https://docs.simbachain.com/documentation/getting-started/obtaining-api-keys

SIMBA Blocks Authentication Service API is one of 4 APIs that [SIMBA Chain](https://apis.io/providers/simba-chain/) publishes on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. Tagged areas include Authentication, OpenID Connect, Verifiable Credentials, and Decentralized Identifiers. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, and an API reference.

SIMBA's OAuth 2.0 / OpenID Connect authorization server and token validator (the "member service validator"). Publishes an OIDC discovery document and a JWKS, issues tokens over the authorization_code, refresh_token and client_credentials grants with PKCE S256, validates external tokens for downstream services, and exposes a Verifiable-Presentation challenge endpoint (/oauth/vc-secure-session) that binds a W3C DID to a session with an optional DPoP proof header. OpenAPI 3.1.0, 22 operations across 15 paths.

## Machine-readable artifacts (7)

- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/simba-chain/refs/heads/main/openapi/simba-chain-member-service-validator-openapi.json
- **Overlay** — https://raw.githubusercontent.com/api-evangelist/simba-chain/refs/heads/main/overlays/simba-chain-member-service-validator-overlay.yaml
- **OpenIDConnectDiscovery** — https://raw.githubusercontent.com/api-evangelist/simba-chain/refs/heads/main/well-known/simba-chain-openid-configuration.json
- **JWKS** — https://raw.githubusercontent.com/api-evangelist/simba-chain/refs/heads/main/well-known/simba-chain-jwks.json
- **OAuthScopes** — https://raw.githubusercontent.com/api-evangelist/simba-chain/refs/heads/main/scopes/simba-chain-scopes.yml
- **Documentation** — https://docs.simbachain.com/documentation/getting-started/obtaining-api-keys
- **APIReference** — https://blocks.simbachain.com/api/member-service-validator/docs

## Other SIMBA Chain APIs (3)

- [SIMBA Blocks Member Service API](https://apis.io/apis/simba-chain/simba-chain-member-service-api/)
- [SIMBA Blocks Platform Service (Dynamic Contract API)](https://apis.io/apis/simba-chain/simba-chain-platform-service-api/)
- [SIMBA Blocks Documentation MCP Server](https://apis.io/apis/simba-chain/simba-chain-documentation-mcp/)

## Tags

Authentication, OpenID Connect, Verifiable Credentials, Decentralized Identifiers

---

Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/simba-chain/simba-chain-authentication-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/simba-chain/.