> ## Documentation Index > Fetch the complete documentation index at: https://docs.purps.lol/llms.txt > Use this file to discover all available pages before exploring further. # Prepare a Pons launch > Step 1: the message to sign with your EVM wallet (`personal_sign`, EIP-191). Pons is the one launchpad that still signs a message before the build, because launching there is invite-only and the signature is how the invite is checked before anything is spent. The message carries a `launches:` line that spells the launch out in words: name, ticker, pair, creator tax and first buy. Send `devBuy` and `creatorTaxBps` here too when you will send them to submit; they are part of those words. ## OpenAPI ````yaml /openapi.json post /pons/launches/prepare openapi: 3.1.0 info: title: PURPS API version: 2.0.0 description: >- Everything purps.lol can do, as JSON. Read the coin list, a coin's full page and the launchpad; launch coins on purps.lol, pump.fun and Pons; wire an existing pump.fun coin's fees into a strategy; steer a coin you own. No key, no signup. A launch is one call that returns unsigned transactions: the launch transaction can only land with your wallet's signature, and that is the proof. The few writes that need a message signature (Pons launches, wiring a strategy onto a coin, creator authority) come as a prepare/submit pair. Every transaction is signed in your wallet, never by us. Every response is `{ ok: true, data }` or `{ ok: false, error }`. Cross-origin requests are allowed from any site. Every answer from the API itself carries `RateLimit-Limit` and `RateLimit-Policy`; uncached ones (writes, prepare and submit, refusals) carry `RateLimit-Remaining` and `RateLimit-Reset` as well. The 503 while the API is paused and the 410 on old v1 write addresses carry neither. servers: - url: https://purps.lol/api/v2 security: [] tags: - name: Coins description: Read what the site shows. - name: Launch on purps.lol description: Launch a coin on purps.lol. Build, sign, send, poll. - name: Launch on pump.fun description: Launch straight on pump.fun with fees wired to a strategy. - name: Launch on Pons description: Launch through Pons, the launchpad on Robinhood Chain. - name: Redirect a pump.fun coin description: Point an existing pump.fun coin's creator fees at a strategy. - name: Manage a coin description: Attach a strategy to a coin launched without one. Creator-signed. - name: Creator authority description: >- Steer a purps.lol coin you own: act on a position, change its strategy, ask for authority, or hand the coin on. Every move is signed by the owner's wallet and published on the coin's Changes tab. - name: Transactions description: Send a signed Solana transaction through our relay and watch it land. paths: /pons/launches/prepare: post: tags: - Launch on Pons summary: Prepare a Pons launch description: >- Step 1: the message to sign with your EVM wallet (`personal_sign`, EIP-191). Pons is the one launchpad that still signs a message before the build, because launching there is invite-only and the signature is how the invite is checked before anything is spent. The message carries a `launches:` line that spells the launch out in words: name, ticker, pair, creator tax and first buy. Send `devBuy` and `creatorTaxBps` here too when you will send them to submit; they are part of those words. operationId: preparePonsLaunch requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/PonsTerms' responses: '200': description: What to sign. content: application/json: schema: type: object properties: ok: type: boolean enum: - true data: $ref: '#/components/schemas/Prepared' '400': description: Every failure carries the same envelope. content: application/json: schema: $ref: '#/components/schemas/Error' '429': description: Every failure carries the same envelope. content: application/json: schema: $ref: '#/components/schemas/Error' components: schemas: PonsTerms: type: object properties: name: type: string description: 1 to 32 characters. required: true symbol: type: string description: 1 to 10 characters. required: true pairToken: type: string description: A pair from /pairs `pons`. Omit or the zero address for ETH. creatorWallet: type: string description: The EVM wallet that signs and sends. required: true devBuy: type: string description: >- Your own first buy, in ETH, as a decimal string. Part of the signed words when sent, so send the same value to submit. creatorTaxBps: type: integer description: >- A creator tax on every trade, basis points, up to 2000. Default 0. Part of the signed words when sent, so send the same value to submit. Prepared: type: object properties: ts: type: integer description: Unix seconds. Send it back unchanged with the signature. message: type: string description: >- The exact text to sign. Sign the UTF-8 bytes as they are: no prefix, no hashing on Solana; `personal_sign` on Robinhood Chain. expiresInSeconds: type: integer description: How long the signature stays valid. 300. hash: type: string description: >- Pons launch prepare only: the terms' hash, as embedded in the message. For your records. configHash: type: string description: >- Strategy and Pons register prepare only: the hash of `config` exactly as you sent it, as embedded in the message. Error: type: object properties: ok: type: boolean description: Always false on a failure. error: type: string description: >- A short reason in plain words: `coin not found`, `too many requests`, `invalid wallet signature`. ````