---
title: "Subscribe"
method: POST
path: "/subscribe"
---

# Subscribe

`POST /subscribe`

## Request

- Base URL: `https://api.optionsdataapi.com` (the document declares no server; this is the origin it was published from)
- URL: `https://api.optionsdataapi.com/subscribe`
- Auth: none declared

Create a subscription key after verifying on-chain USDC payment.
Fully automated: user sends USDC from their wallet, calls this endpoint
with the tx_hash, and receives an API key instantly.

## Query parameters

- `tx_hash` string, required
- `tier` string

## Response `200`

Successful Response

- unknown

## Other responses

- `422`: Validation Error

---

[API](https://skmtc.dev/optionsdataapi/apis/options-data-api.md) · [All operations](https://skmtc.dev/optionsdataapi/apis/options-data-api/llms.txt) · [OpenAPI document](https://skmtc.dev/optionsdataapi/apis/options-data-api/revisions/ccce476412d9?raw)