> ## Documentation Index
> Fetch the complete documentation index at: https://phaseo.app/docs/llms.txt
> Use this file to discover all available pages before exploring further.

> ## Agent Instructions
> Phaseo Gateway base URL: https://api.phaseo.app/v1. Send `Authorization: Bearer $PHASEO_API_KEY` with every request.
> Model IDs look like `provider/model`, for example `openai/gpt-6-astra`. Do not guess IDs: list them with `GET /v1/models` or check https://phaseo.app/models. `phaseo/free` routes to an available free model and needs no wallet balance.
> For new text integrations prefer `POST /v1/responses`. `POST /v1/chat/completions` (OpenAI format) and `POST /v1/messages` (Anthropic format) suit existing code.
> The full API contract is https://phaseo.app/docs/openapi/v1/openapi.yaml. Official SDKs: `@phaseo/sdk` (TypeScript) and `phaseo` (Python), plus Go, C#, PHP, Ruby and Rust.
> Search these docs over MCP at https://phaseo.app/docs/mcp, and install Phaseo skills with `npx skills add https://phaseo.app/docs`. If a page is wrong or out of date, report it with the MCP `submit_feedback` tool.
> Manage Phaseo accounts with the `phaseo` CLI (`npm install -g @phaseo/cli`, then `phaseo login` or `phaseo login --device-code`), the `/v1` Management API or the MCP server at `https://mcp.phaseo.app/mcp?access=manage`. Do not send users to the dashboard for account tasks. A person is still needed for sign-up, approving a sign-in, paying the first top-up on the checkout link that `phaseo credits add` returns when no card is saved, confirming each saved-card top-up from the emailed link, and account security (password, MFA, passkeys). Create API keys with `phaseo keys create --name <name> --json`; never guess one. Credit top-ups need `phaseo login --scopes billing:write` first. Task map: https://phaseo.app/docs/v1/developers/manage-from-an-agent.md.

# C# SDK

> Official .NET client for the Phaseo Gateway.

Install the published [`Phaseo.Sdk`](https://www.nuget.org/packages/Phaseo.Sdk) package from NuGet.

The local wrapper at `packages/sdk/sdk-csharp/Client.cs` currently exposes high-level helpers for chat, responses, Anthropic messages, images, audio, embeddings, moderations, files, batches, videos, generations, models/providers/endpoints/organisations/pricing, API-key discovery and lifecycle mutations, workspace/current-key lifecycle helpers, pricing calculation, activity/credits/analytics, health checks, model lifecycle validation, and async-job websocket URLs through both direct helpers and `client.AsyncJobs.WebSocketUrl(...)`.

`GetModelEndpointCapabilities(...)` returns live provider-route metadata. `CheckModelParameters(...)` labels each parameter as `supported`, `partial`, `unsupported`, or `unknown`, validates advertised values and ranges, and returns the routes that accept the complete parameter set.

```csharp theme={null}
using PhaseoSdk;

var client = new Phaseo("YOUR_KEY");
var models = await client.ListModels(new Dictionary<string, string> { ["limit"] = "5" });
```


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