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Aria Compute PIN is the end-side post-training service for fine-tuning, LoRA adaptation, reinforcement learning, evaluation, and model export. The PIN API exposes these capabilities over HTTP at base URL http://<pin-host>:8001 under the /v1 path prefix. All /v1/* routes require a Bearer API key passed in the Authorization header, except for public routes such as /health, /version, /v1/auth/login, and /v1/auth/register. Routes under /v1/agent/* use a node-agent HMAC token scheme and are intended for internal agent callbacks. Error responses follow a standard envelope:
Common status codes include 400 for validation errors, 401 for unauthorized requests, 404 for missing resources, and 500 for internal errors.

Authentication

Learn how to authenticate with Bearer API keys and node-agent HMAC tokens.

Create a Job

Submit fine-tuning, LoRA, or RL jobs through the PIN API.

List Models

Browse available base models and exported checkpoints.

Billing Summary

Retrieve usage and billing summaries for your organization.