# Toolchain
> Install the pay CLI, configure accounts, and reference every subcommand.

- [Toolchain](/docs/toolchain/index.md): Install the pay CLI, configure accounts, and use the grouped command reference.
- [Install](/docs/toolchain/install/index.md): Install the pay CLI, set up a wallet, and wire it into your AI agent.
- [Configuration](/docs/toolchain/configuration/index.md): Files pay reads on every invocation — pay.toml, accounts.yml, and the PAY_* environment variables.
- [Global flags](/docs/toolchain/global-flags/index.md): Flags that select network, account, automation, protocol, and debugger behavior — plus the environment variables that override defaults.
- [Commands](/docs/toolchain/commands/index.md): Full pay CLI reference, grouped the way pay --help groups them.
- [Pass-through commands](/docs/toolchain/commands/pass-through/index.md): pay curl, wget, http, claude, codex, and whoami — wrap an external tool while pay handles HTTP 402.
- [Developer commands](/docs/toolchain/commands/developers/index.md): pay server and pay catalog — gate an API with stablecoin payments, then make it discoverable.
- [Agent commands](/docs/toolchain/commands/agents/index.md): pay mcp and pay skills — run the Pay MCP server and browse the pay-skills provider catalog.
- [Account commands](/docs/toolchain/commands/accounts/index.md): pay topup, account, setup, send, and subscriptions — manage wallets, fund them, send stablecoins, and track MPP subscriptions.
- [Other commands](/docs/toolchain/commands/other/index.md): pay fetch and pay install — the built-in HTTP client and the shorthand for adding provider sources.
- [Troubleshooting](/docs/toolchain/troubleshooting/index.md): Common errors and the fix for each.