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Agent Kits

Your coding agent, on one prepaid key.

8 maintained tools, each with the exact settings to point it at Relaykit: base URL, key and model ids that we have checked against the gateway. Pick yours, paste, run one test.

  1. 01

    Create a key

    In the console, one per tool or project, with a spend limit if you like. Open keys

  2. 02

    Paste the config

    Copy the block for your tool below. Replace sk-your-key-here with your key.

  3. 03

    Run the check

    Each kit ends with a one-line test. The request shows up in your usage log.

01 · CLI

Claude Code

Anthropic’s agentic coding tool for the terminal. It reads your repository, edits files and runs commands, and also ships as a VS Code extension.

Protocol
Anthropic Messages
Models
claude-opus-5-5claude-sonnet-5claude-haiku-4-5claude-sonnet-5-5
Where it goes
Two environment variables, or the env block in ~/.claude/settings.json.
# this terminal only
export ANTHROPIC_BASE_URL="https://api.oneaiapikey.com"
export ANTHROPIC_AUTH_TOKEN="sk-your-key-here"
export ANTHROPIC_MODEL="claude-sonnet-5"
{
  "env": {
    "ANTHROPIC_BASE_URL": "https://api.oneaiapikey.com",
    "ANTHROPIC_AUTH_TOKEN": "sk-your-key-here",
    "ANTHROPIC_MODEL": "claude-sonnet-5",
    "ANTHROPIC_DEFAULT_OPUS_MODEL": "claude-opus-5-5",
    "ANTHROPIC_DEFAULT_SONNET_MODEL": "claude-sonnet-5",
    "ANTHROPIC_DEFAULT_HAIKU_MODEL": "claude-haiku-4-5"
  }
}
claude
# then type /status: the base URL line should show https://api.oneaiapikey.com
  • Try it in this terminal: No /v1 on the base URL: Claude Code appends /v1/messages itself. Then run claude from the same terminal.
  • ~/.claude/settings.json: Merge the env keys into an existing file. Use the user-level file, never a project file that is committed to git.
Full Claude Code guideChange model or shell

02 · CLI

Codex CLI

OpenAI’s open-source coding agent for the terminal. It talks to models through the Responses API.

Protocol
OpenAI-compatible (Responses API)
Models
gpt-6.1-solgpt-5.6-solgpt-5.6-terra
Where it goes
A model provider entry in ~/.codex/config.toml plus one key variable.
model = "gpt-6.1-sol"
model_provider = "relaykit"

[model_providers.relaykit]
name = "Relaykit"
base_url = "https://api.oneaiapikey.com/v1"
env_key = "RELAYKIT_API_KEY"
wire_api = "responses"
stream_idle_timeout_ms = 300000
request_max_retries = 4
# add to ~/.bashrc or ~/.zshrc to keep it
export RELAYKIT_API_KEY="sk-your-key-here"
codex exec "Reply with the single word: ready"
Full Codex CLI guideChange model or shell

03 · IDE

Cursor

An AI code editor built on VS Code. Chat and Agent can use your own OpenAI-format key with a base URL override.

Protocol
OpenAI-compatible
Models
All 11 models, defaultclaude-sonnet-5
Where it goes
Cursor Settings → Models: API key, base URL override and custom model names.
OpenAI API Key:            sk-your-key-here
Override OpenAI Base URL:  https://api.oneaiapikey.com/v1
Add custom model:          claude-sonnet-5
curl -sS https://api.oneaiapikey.com/v1/models -H "Authorization: Bearer sk-your-key-here"
  • Cursor Settings → Models → API Keys: The base URL override is global: turn it off to go back to the models in your Cursor plan.
  • Check the key: A JSON list of model ids means the key and URL are right.
Full Cursor guideChange model or shell

04 · Extension

Cline

An open-source coding agent inside VS Code that asks for approval before it edits files or runs commands.

Protocol
OpenAI-compatible
Models
All 11 models, defaultclaude-sonnet-5
Where it goes
The OpenAI Compatible provider in Cline’s settings panel.
API Provider:  OpenAI Compatible
Base URL:      https://api.oneaiapikey.com/v1
API Key:       sk-your-key-here
Model ID:      claude-sonnet-5
curl -sS https://api.oneaiapikey.com/v1/models -H "Authorization: Bearer sk-your-key-here"
  • Check the key: A JSON list of model ids means the key and URL are right.
Full Cline guideChange model or shell

05 · Extension

Kilo Code

An open-source coding agent for VS Code with a companion command-line tool.

Protocol
OpenAI-compatible
Models
All 11 models, defaultclaude-sonnet-5
Where it goes
A custom provider in the extension, or kilo.jsonc for the CLI.
Provider ID:   relaykit
Display name:  Relaykit
Provider API:  OpenAI Compatible
Base URL:      https://api.oneaiapikey.com/v1
API key:       sk-your-key-here
Model:         claude-sonnet-5
{
  "$schema": "https://app.kilo.ai/config.json",
  "model": "relaykit/claude-sonnet-5",
  "provider": {
    "relaykit": {
      "npm": "@ai-sdk/openai-compatible",
      "name": "Relaykit",
      "options": {
        "baseURL": "https://api.oneaiapikey.com/v1",
        "apiKey": "{env:RELAYKIT_API_KEY}"
      },
      "models": {
        "claude-sonnet-5": {
          "name": "Claude Sonnet 5",
          "tool_call": true
        }
      }
    }
  }
}
# add to ~/.bashrc or ~/.zshrc to keep it
export RELAYKIT_API_KEY="sk-your-key-here"
Full Kilo Code guideChange model or shell

06 · CLI

OpenCode

An open-source coding agent for the terminal with a full-screen interface and many pluggable providers.

Protocol
OpenAI-compatible
Models
All 11 models, defaultclaude-sonnet-5
Where it goes
A custom provider in opencode.json using @ai-sdk/openai-compatible.
{
  "$schema": "https://opencode.ai/config.json",
  "model": "relaykit/claude-sonnet-5",
  "provider": {
    "relaykit": {
      "npm": "@ai-sdk/openai-compatible",
      "name": "Relaykit",
      "options": {
        "baseURL": "https://api.oneaiapikey.com/v1",
        "apiKey": "{env:RELAYKIT_API_KEY}"
      },
      "models": {
        "claude-sonnet-5": {
          "name": "Claude Sonnet 5"
        }
      }
    }
  }
}
# add to ~/.bashrc or ~/.zshrc to keep it
export RELAYKIT_API_KEY="sk-your-key-here"
opencode run "Reply with the single word: ready"
Full OpenCode guideChange model or shell

07 · CLI

Aider

An open-source pair programmer in the terminal that edits files in your git repository and commits each change.

Protocol
OpenAI-compatible
Models
All 11 models, defaultclaude-sonnet-5
Where it goes
OPENAI_API_BASE and OPENAI_API_KEY, and the openai/ prefix on the model name.
# add to ~/.bashrc or ~/.zshrc to keep it
export OPENAI_API_BASE="https://api.oneaiapikey.com/v1"
export OPENAI_API_KEY="sk-your-key-here"
aider --model openai/claude-sonnet-5
openai-api-base: https://api.oneaiapikey.com/v1
model: openai/claude-sonnet-5
# keep the key in OPENAI_API_KEY, not in this file
  • Start Aider: The openai/ prefix tells Aider to use the OpenAI-compatible route.
Full Aider guideChange model or shell

08 · IDE

Zed

A fast, native code editor. Its Agent Panel can use any OpenAI-compatible provider.

Protocol
OpenAI-compatible
Models
All 11 models, defaultclaude-sonnet-5
Where it goes
language_models.openai_compatible in Zed’s settings.json.
{
  "language_models": {
    "openai_compatible": {
      "Relaykit": {
        "api_url": "https://api.oneaiapikey.com/v1",
        "available_models": [
          {
            "name": "claude-sonnet-5",
            "display_name": "Claude Sonnet 5",
            "max_tokens": 128000,
            "max_output_tokens": 16000,
            "capabilities": {
              "tools": true,
              "images": true,
              "parallel_tool_calls": false,
              "prompt_cache_key": false,
              "chat_completions": true
            }
          }
        ]
      }
    }
  }
}
# add to ~/.bashrc or ~/.zshrc to keep it
export RELAYKIT_API_KEY="sk-your-key-here"
  • Zed settings.json: max_tokens is a conservative context budget; raise it if you know the model’s limit.
  • Key: Or paste the key in the Agent Panel settings. Zed reads RELAYKIT_API_KEY when it is launched from that shell.
Full Zed guideChange model or shell

Before a long session

Give each agent its own key and a spend limit.

Agents can loop. A per-key credit cap turns a runaway session into a stopped key instead of an empty balance, and the usage log shows which tool spent what.

Get API keyHow key limits work