# taskfuel.ai > taskfuel is the unified interface for paid HTTP-402 APIs: an agent can discover and call pay-per-use services through one prepaid USD account without managing wallets or payment protocols. ## Getting started - [Setting up taskfuel](https://app.taskfuel.ai/setup.md): Start here. Three alternative ways in. Pick one there and follow only that one. - [Using taskfuel](https://app.taskfuel.ai/using.md): After setup, whichever way you took: quote before you pay, what the spending limits are, and what to show the user first. ## Reference - [Building apps powered by taskfuel](https://app.taskfuel.ai/building-apps.md): A different job from the above: giving an app its own key so it calls paid services server-side, with no user in the loop at call time. - [OpenAPI document](https://app.taskfuel.ai/openapi.json): OpenAPI 3.1.1 description of the gateway's public HTTP API. - [MCP server](https://app.taskfuel.ai/mcp): The Streamable HTTP MCP endpoint itself; tools are `discover`, `call`, `rate`, `feedback`, `balance`. ## Product - [taskfuel.ai](https://taskfuel.ai): Product overview and entry point. - [Account dashboard](https://app.taskfuel.ai): Sign in, approve agent connections, manage API keys, view balance, and top up with a card.