Launchtube

Getting Stellar transactions successfully submitted to the network can be a chore. You've got a lot to think about between XLM fees, sequence numbers, block times, retries, rate limits, ledger limits, and more. This gets even trickier when trying to submit smart contract invocations. Soroban contracts can't pay Stellar transaction fees and they maintain nonces not sequence numbers.

The Launchtube service aims to alleviate all of these challenges and complexities by giving you an API which accepts Soroban ops and then handles getting those entries successfully submitted to the network. No XLM or G-addresses required! Just simulate and sign your Soroban ops, submit them to Launchtube, and we'll handle getting them onchain. Too easy!

Caution

Launchtube is an experimental service and while SDF maintains a mainnet implementation we make no guarantees about its stability, availablility or longevity. Do not use SDF's Launchtube service for mission-critical production services.

Base URL

• Testnet https://testnet.launchtube.xyz
• Mainnet https://launchtube.xyz

Public Endpoints

Authorization

Headers

• Authorization: Bearer {jwt token}

Note

• For Testnet JWT tokens just open https://testnet.launchtube.xyz/gen
• For Mainnet tokens drop a note in the #launchtube channel in our Discord

---

POST /

Submit a transaction

Important

Credits are spent with progressive levels of granularity as the transaction moves through the backend

• Initially upon submission 100_000 credits are spent
• Assuming your tx simulates successfully, those 100_000 credits are refunded and the simulation bid fee is spent
• If your tx submission is successful the bid fee is refunded and the final tx fee is spent

This ensures a fair and predictable system without restrictive rate limits by incentiving properly formed transactions

Body

• fee (optional)

  Number of credits (stroops) you want to spend on the inclusion fee to submit the transaction

AND

• xdr

  Transaction you want submitted as an XDR encoded String

OR

• func

  xdr.HostFunction encoded as an XDR String

• auth

  Array of xdr.SorobanAuthorizationEntry encoded XDR Strings

Headers

• Content-Type: x-www-form-urlencoded

Return

The response of the transaction submission as JSON assuming it was successful. Otherwise a (hopefully) useful JSON error

Headers

• X-Credits-Remaining: String numeric value of the token's remaining credits (stroops)

---

GET /info

Get the remaining credits (stoops) available for your token

Return

String numeric value of the token's remaining credits (stroops)

---

GET /activate

Webpage form to activate your token to enable usage of the API

Query

• token

  The {jwt token} you were given and wish to activate

---

POST /activate

The API endpoint used by the GET / webpage form to activate your token

Body

• token

  The {jwt token} you were given and wish to activate

Headers

• Content-Type: x-www-form-urlencoded

---

GET /claim

Webpage form to create and activate a new token

Query

• code

  The claim {claim code} you were given and wish to use to create and activate a new token with

---

POST /claim

The API endpoint used by the GET /claim webpage form to create and activate new tokens via claim codes

Body

• code

  The claim {claim code} you were given and wish to use to create and activate a new token with

Headers

• Content-Type: x-www-form-urlencoded

Return

HTML page with the newly activated token you can use as the {jwt token} to authenticate the service

---

Private Endpoints

Authorization

Headers

• Authorization: Bearer {auth token}

If you are a member of the SDF and need an auth token let tyler@stellar.org know

---

GET /qrcode

Generate a list of new credit JWT tokens

Return

PNG QR code image linking to {location.origin}/claim?code={claim code}.

Headers

• X-Claim-Code: String the claim code you can use to create new tokens

[!NOTE]
For SDF members only. If you open this page without an Authorization header it will be an HTML form to input your auth token which when saved will include it as a cookie which will allow you to generate QR codes right on the page whenever you refresh the page.

---

GET /gen

Generate a list of new credit JWT tokens

Query

• ttl

  The number of seconds these tokens should live for

• credits

  The number of credits these tokens can spend (in stroops)

• count

  The number of unique new tokens to generate (max of 100)

Return

JSON array of tokens which will be what you hand out like candy

---

DELETE /:sub

Delete a previously generated token

Params

• sub

  The JWT sub claim of the token you want to delete

Return

OK

---

POST /sql

Run a SQL query on the database

[!CAUTION]
Be careful! I don't do any query validation before running your query so you could easily bork the database with an erroneous query. So don't do that

Body

• query

  SQL query you want to run. e.g. SELECT * FROM Transactions LIMIT 100

• args

  Positional arguments for the query. Include as strings in an array. e.g. ["arg1", "arg2"]

Headers

• Content-Type: x-www-form-urlencoded

Return

JSON array of results from the query (if any) e.g.

[
    {
        "Sub": "712f3af6061d26ac4c573151e116547a3b58b364fcf5a6df8f1a5916d540cae3",
        "Tx": "40833f9c1b6e3187f7ff915a2bbad55e422650a283d3d13d941a5eaf81abaed7"
    },
    {
        "Sub": "712f3af6061d26ac4c573151e116547a3b58b364fcf5a6df8f1a5916d540cae3",
        "Tx": "f5b4d4638944ffab6ca693fe4036275c4822dd46e7e0f558a4e53a38f704fb45"
    },
    ...
]

Sub is the token's sub claim and Tx is the transaction hash

---

GET /seq

Get information about the sequencer Durable Object. You very probably don't ever need to run this. It's really just for system maintainers doing health or debug checks

Body

Review the endpoint code for available params

Return

JSON object with information about the sequencer. Again, review the code for the exact shape of the response