n8n

n8n is a workflow automation platform whose OpenAI node accepts a custom base URL in its credentials. Point that node at MirAPI and your chat workflows run on your MirAPI key and prepaid balance.

What you need

Element	Value
Base URL	`https://api.mirapi.ai/v1`
API key	Your MirAPI key (`sk-...`)
Model	`deepseek-chat`
Protocol	OpenAI-compatible (`/v1`)

Configure

Create a MirAPI key in https://platform.mirapi.ai → API Keys and copy it (it is shown only once).
In n8n, create OpenAI credentials (Credentials → New → OpenAI) and set the Base URL and API Key:

Base URL: https://api.mirapi.ai/v1
API Key:  sk-...

Add an OpenAI → Chat Model node and set its Model to deepseek-chat.

Verify with a workflow

Build a minimal workflow: Webhook → OpenAI Chat Model → Respond to Webhook.

Webhook node: add a Message parameter.
OpenAI Chat Model node: set the model to deepseek-chat and the system prompt to You are a helpful assistant.
Respond to Webhook node: output {{ $json.message }}.

Call the webhook URL:

curl -X POST "<webhook-url>" \
  -H "Content-Type: application/json" \
  -d '{"message": "Reply with exactly: connected to MirAPI"}'

The response should contain connected to MirAPI. The first request draws a small amount from your prepaid balance; confirm it later in the Platform billing log or via GET /api/usage/token.

How it works

n8n’s OpenAI Chat Model node speaks the OpenAI Chat Completions protocol. MirAPI serves that protocol at https://api.mirapi.ai/v1, so the node’s requests land on POST /v1/chat/completions. Responses stream as standard SSE (data: lines ending with data: [DONE]), and reasoning content arrives before the final answer.

MirAPI serves the same models over three protocols. The OpenAI node described here uses the OpenAI-compatible protocol; the same key also works over the other two protocols if you use n8n’s Anthropic or Gemini nodes:

Protocol	Base URL	Authentication
OpenAI-compatible	`https://api.mirapi.ai/v1`	`Authorization: Bearer`
Anthropic	`https://api.mirapi.ai`	`x-api-key` or `Authorization: Bearer`
Gemini	`https://api.mirapi.ai` or `https://api.mirapi.ai/v1beta`	`x-goog-api-key` or `?key=`

Errors and billing

Status	Meaning	What to do
`401`	Key missing, invalid, or unknown	Fix the key in the OpenAI credentials
`403`	Key valid but rejected: balance exhausted, model not whitelisted, quota reached, or IP not allowed	Resolve the cause, then retry
`413`	Request too large	Reduce the payload
`429`	Rate limited (no `Retry-After` header)	Retry with jittered exponential backoff (1s → 2s → 4s, cap ~30s)
`500`	Server error	Safe to retry idempotent requests

Every error message ends with a request ID; include it in any support ticket.

Chat usage is billed per token for input, output, and cache read, priced per 1M tokens. Reasoning tokens count as output, and cache reads cost less than normal input. Prompt caching is automatic on OpenAI-compatible models; confirm hits via usage.prompt_tokens_details.cached_tokens. The balance is prepaid in USD and never expires, with no subscription or minimum spend. When it runs out, you get 403, and the same key works again immediately after a top-up. Reconcile usage in the Platform billing log or via GET /api/usage/token (account-level summary) and GET /api/log/token (per-request detail).

Tool-specific pitfalls

Keep /v1. n8n appends /chat/completions to the base URL; omitting /v1 breaks the request path.
The model list is manual. n8n cannot auto-discover MirAPI models, so type deepseek-chat if it is not listed. Use the exact id from GET /v1/models and drop any vendor/ prefix.
403 with a valid key usually means the model is not whitelisted for that key or the balance is exhausted. Top up or adjust the key’s whitelist, then retry.
Streaming needs nothing special. Newer n8n versions stream chat output by default; the gateway’s stream is standard SSE, so the node handles it without extra configuration.