New Feature: Simpler, Faster Transaction Submission

0slot is introducing a new Transaction Submission method. Building upon the traditional submission method (see How to start with 0slot?). This new feature provides a simpler and faster way to submit transactions.

Principles & Advantages

Skips CORS Preflight: Eliminates the latency (often tens of milliseconds) caused by CORS preflight checks.
Plain Text instead of JSON Payload: Using a plain text payload avoids JSON parsing overhead. Additionally, smaller payloads reduce transfer time and costs.

How to Use

Below is an example of how to submit a transaction using a curl command:

curl -X POST 'http://de.0slot.trade/txn?api-key=KEY' \
-H "Content-Type: text/plain" \
-d "<base64_transaction_string>"

Configuration Details

1. API Key: Replace KEY in the URL with the API KEY or TOKEN provided by 0slot.

2. Server Selection: In the example, "de.0slot.trade" is the server domain. We provide faster servers for different global locations. Please test and select the most suitable server. Below are the available 0slot server addresses by region:

New York (NY): ny.0slot.trade
Frankfurt (DE): de.0slot.trade
Amsterdam, Netherlands (AMS NL): ams.0slot.trade
Tokyo (JP): jp.0slot.trade
Los Angeles (LA): la.0slot.trade

3. Required Header: You must specify the unique request header: Content-Type: text/plain

4. Keep-Alive: If there are long intervals between calls, you can use the health endpoint to maintain a keepalived connection: http://de.0slot.trade/health (remember to replace de.0slot.trade with your selected server):

5. Protocols: Both HTTP and HTTPS are supported.

6. Anti-MEV and Secure Parameters: The existing anti-mev and secure parameters remain valid.

Anti-MEV: http://de.0slot.trade/txn?api-key=KEY&anti-mev=true
Secure: http://de.0slot.trade/txn?api-key=KEY&secure=true

Response of Submitting a Transaction

The response of submitting a transaction contains different status codes and plain-text response bodies.
Below is a table summarizing each status code and its corresponding meaning.

Status Code	Message (Plain Text)	Meaning
200	`ok`	Transaction submitted successfully
403	`api-key key is null`	The `api-key` in the request URL is empty; a valid `api-key` must be provided
403	`api-key does not exist`	The provided `api-key` does not exist; please verify or contact support
403	`api-key has expired`	The `api-key` has expired; please verify or contact support
419	`rate limit exceeded`	The request frequency has exceeded the account’s allowed rate limit
500	`ok`	Transaction submission failed

Important Notes

Backward Compatibility: The traditional 0slot submission method (refer to How to start with 0slot?) remains fully effective and is not affected by this upgrade. Users may choose to adopt the new Transaction Submission method based on their specific needs.

Support

For additional assistance, our support team is available through these channels:

Discord Support: Join our community
Twitter/X: Follow @0slot_trade
Telegram: Message @kurt0slot