# /u/*/submit — TSN Relay

POST /u/{namespace}/submit delivers an encrypted blob to an inbox.

## Purpose

POST /u/{namespace}/submit delivers an encrypted blob to an inbox.

Price: $0.01 USDC

## Request

```
POST /u/a1b2c3d4/submit
```

## Input

- `payload` — example: `encrypted-base64url-blob`

## Response

```json
{
  "ok": true
}
```

## Payment

No API key. Call once to receive `402 Payment Required` with the x402
terms, pay $0.01 USDC on Base Mainnet via https://x402.thesoulnetwork.eu, then send the 1-hour ticket as
`Authorization: Bearer <ticket>`.