12. [RPC] Support RPC authentication (API Keys)

[dotandev]

Description
Allow the CLI to pass API keys or bearer tokens to the Horizon/RPC providers.

Requirements and Context

• Background: Many production RPC providers (NowNodes, BlockDaemon) require authentication.
• Success Criteria (Done):
  • ERST_RPC_TOKEN used in headers.
  • --rpc-token flag supported.

Suggested Execution

• Fork/Branch: feature/rpc-auth
• Implementation:
  • Update rpc.Client to include a custom http.RoundTripper.
  • Inject the Authorization or X-API-Key header into every request.

Test and Commit

• Testing:
  • Use a mock server to verify the presence of the authentication header.
• PR Inclusions:
  • Updated Client initialization.
  • Config/Flag support for tokens.

Example Commit Message
feat(rpc): support api keys and bearer tokens

Guidelines

• Must-haves: Do not log the token value in Debug logs.

---

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[ALIPHATICHYD]

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