> For the complete documentation index, see [llms.txt](https://docs.nexus.xyz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.nexus.xyz/api-reference/guides.md).

# Guides

- [Get Started](https://docs.nexus.xyz/api-reference/guides/get-started.md)
- [Authentication](https://docs.nexus.xyz/api-reference/guides/authentication.md)
- [Agent Keys](https://docs.nexus.xyz/api-reference/guides/agent-keys.md)
- [Rate Limits](https://docs.nexus.xyz/api-reference/guides/rate-limits.md): What a request costs, what the rate-limit headers mean, which budgets are independent of which, and what happens when you exceed each.
- [Networks](https://docs.nexus.xyz/api-reference/guides/networks.md): How every Nexus Exchange interface selects a network — testnet, mainnet, local, or a custom target you describe yourself.
- [Order Types](https://docs.nexus.xyz/api-reference/guides/order-types.md): The eight order types, the four time-in-force policies, and which fields each one requires.
- [Portfolio & Account State](https://docs.nexus.xyz/api-reference/guides/portfolio.md): Consolidated account state, withdrawable balance, fee schedule, enriched positions, and the portfolio time-series — across the SDKs and CLI.
- [Venue Statistics](https://docs.nexus.xyz/api-reference/guides/statistics.md)
- [Errors](https://docs.nexus.xyz/api-reference/guides/errors.md): The status codes the contract declares, the rate-limit headers, and how a 401 deliberately tells you nothing.
- [Known Gaps](https://docs.nexus.xyz/api-reference/guides/known-gaps.md): Gaps and inconsistencies in the API contract, flagged rather than filled.
- [Schema Reference](https://docs.nexus.xyz/api-reference/guides/schemas.md)


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