> ## Documentation Index
> Fetch the complete documentation index at: https://docs.p2p.org/llms.txt
> Use this file to discover all available pages before exploring further.

# Pricing, Rate Limits & Support

## Plans

|                        | Public (Tip-Based)                  | Private (API Key)                        |
| ---------------------- | ----------------------------------- | ---------------------------------------- |
| **Tip requirement**    | Required (minimum 100,000 lamports) | Required (minimum 50,000 lamports)       |
| **Authentication**     | Tip required in transaction         | API key + tip in transaction             |
| **Endpoint**           | `/public`                           | `/` or `/rpc`                            |
| **Supported methods**  | `sendTransaction` only              | All Solana RPC methods                   |
| **Default rate limit** | 1 TPS per IP                        | 50 TPS per client (custom for dedicated) |

**Tip accounts:**

```
BPZrtYhdoAhiHWV5EgGLoV7bZFbMamBZurGDq4DmST8v
7D5pdbkV75Sr73M1YFNZwXMed6DenwkdfbJwVWrX6drQ
ELpn2NryEW4B3psG36eSjF45YcGMQpGGuu9J2AgAccbV
FnckAPC9PitnRpGZM2M4WLwb3w9odRLJ7EDRZDngjvd6
3ZnDTgvVfwzqwWoqAUmDkgVtXvXqjmeb5t9zxD5pMbmv
3SLDFcdCzMbcFNguZhzmV4zqEAUvcPoKY13akpE4Tq1p
48tT6LJqrsoFrLpzZSHkjGdGTWtsJ1PvjgWZjh8qF1RK
7GM9fpVMHHcrK4cgzfVdzJvjiy1bSyfwSYzhxvgbfVLg
CBd8GE3ffMJKf3iCCcNNBEifMxH1WpgtTzRnXPxxbjGE
```

## Rate limits

### How it works

* **Algorithm:** Fixed 1-second window counter
* **Private endpoint:** Rate limited per client
* **Public endpoint:** Rate limited per source IP address

### Default limits

| Endpoint | Default TPS   | Customizable?    |
| -------- | ------------- | ---------------- |
| Public   | 1 per IP      | No               |
| Private  | 50 per client | Yes (per client) |

### Rate limit response

When the limit is exceeded, you receive an HTTP **429** response with rate limit headers:

<CodeGroup>
  ```bash bash theme={null}
  HTTP/1.1 429 Too Many Requests
  X-RateLimit-Limit: 10
  X-RateLimit-Remaining: 0
  Retry-After: 1
  Content-Type: application/json
  ```
</CodeGroup>

<CodeGroup>
  ```json JSON theme={null}
  {
    "jsonrpc": "2.0",
    "error": {
      "code": -32005,
      "message": "Rate limit exceeded"
    },
    "id": 1
  }
  ```
</CodeGroup>

Wait for the number of seconds indicated by `Retry-After` before sending the next request.

## FAQ

### What encoding should I use for transactions?

**Base64** (recommended). Always pass `{"encoding": "base64"}` in the params. The transaction bytes should be the serialized, signed transaction encoded as a base64 string.

### Can I use Syncro Sender for read-only RPC calls?

Yes, on **private endpoints** when this capability is enabled on your client profile. This proxies standard Solana RPC methods (e.g., `getBalance`, `getTransaction`, `getSlot`) through Syncro Sender's RPC backend.

### What happens if my tip is too low?

You'll receive an error response with code `-32602`:

<CodeGroup>
  ```json JSON theme={null}
  {
    "jsonrpc": "2.0",
    "error": {
      "code": -32602,
      "message": "Insufficient tip: provided 50000 lamports, required 100000 lamports"
    },
    "id": 1
  }
  ```
</CodeGroup>

The error message includes both the amount you provided and the required minimum, so you can adjust accordingly.

### How do I check if my transaction landed?

Use any standard Solana RPC's `getSignatureStatuses` method:

Syncro Sender handles **delivery** — it sends your transaction to validator leaders through multiple channels. Confirmation tracking should be done separately.

## Contact & support

* Telegram: [support.p2p.org](http://support.p2p.org/)
* Email [support@p2p.org](mailto:support@p2p.org)


## Related topics

- [Syncro Sender Overview](/docs/syncro-sender-overview.md)