---
title: "Subscribe to a Mobula API plan via MPP payment. Creates or updates an agent customer with the selected plan (Startup, Growth, Enterprise) and billing frequency (monthly, yearly). Returns an API key and user_id. If upgrading, pass ?upgrade=true. Before subscribing, check /agent/mpp/subscription to verify no active plan. After subscribing, use the returned API key with header \"x-api-key: <key>\" (or \"Authorization: <key>\") to call any Mobula REST endpoint without further MPP payments. You can also connect to WebSocket streams at wss://streams.mobula.io for real-time trade feeds, price updates, and market events using the same API key. Full documentation: https://docs.mobula.io"
method: GET
path: "/agent/mpp/subscribe"
tags: ["Agent"]
---

# Subscribe to a Mobula API plan via MPP payment. Creates or updates an agent customer with the selected plan (Startup, Growth, Enterprise) and billing frequency (monthly, yearly). Returns an API key and user_id. If upgrading, pass ?upgrade=true. Before subscribing, check /agent/mpp/subscription to verify no active plan. After subscribing, use the returned API key with header "x-api-key: <key>" (or "Authorization: <key>") to call any Mobula REST endpoint without further MPP payments. You can also connect to WebSocket streams at wss://streams.mobula.io for real-time trade feeds, price updates, and market events using the same API key. Full documentation: https://docs.mobula.io

`GET /agent/mpp/subscribe`

Subscribe to a Mobula API plan via MPP payment. Creates or updates an agent customer with the selected plan (Startup, Growth, Enterprise) and billing frequency (monthly, yearly). Returns an API key and user_id. If upgrading, pass ?upgrade=true. Before subscribing, check /agent/mpp/subscription to verify no active plan. After subscribing, use the returned API key with header "x-api-key: <key>" (or "Authorization: <key>") to call any Mobula REST endpoint without further MPP payments. You can also connect to WebSocket streams at wss://streams.mobula.io for real-time trade feeds, price updates, and market events using the same API key. Full documentation: https://docs.mobula.io

## Response `200`

Successful response

## Other responses

- `402` — Payment Required

---

[API](https://skmtc.net/mobula/apis/mobula-api.md) · [All operations](https://skmtc.net/mobula/apis/mobula-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/mobula/mobula-api/versions/32f95d9e8ff2/schema)