> ## 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 Robinhood Chain launch

> Step 1: the message to sign with your EVM wallet (`personal_sign`, EIP-191).



## OpenAPI

````yaml https://purps.lol/api/v1/openapi.json post /robinhood/launches/prepare
openapi: 3.1.0
info:
  title: PURPS API
  version: 1.0.0
  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 Robinhood Chain;
    wire an existing pump.fun coin's fees into a strategy. No key, no signup. A
    write is authorised by your own wallet's signature and 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.
servers:
  - url: https://purps.lol/api/v1
security: []
tags:
  - name: Coins
    description: Read what the site shows.
  - name: Launch on purps.lol
    description: Launch a coin on purps.lol. Prepare, sign, submit, send, poll.
  - name: Launch on pump.fun
    description: Launch straight on pump.fun with fees wired to a strategy.
  - name: Launch on Robinhood Chain
    description: Launch through Pons 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: Transactions
    description: Send a signed Solana transaction through our relay and watch it land.
paths:
  /robinhood/launches/prepare:
    post:
      tags:
        - Launch on Robinhood Chain
      summary: Prepare a Robinhood Chain launch
      description: >-
        Step 1: the message to sign with your EVM wallet (`personal_sign`,
        EIP-191).
      operationId: prepareRobinhoodLaunch
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/RobinhoodTerms'
      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:
    RobinhoodTerms:
      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 `robinhood`. Omit or the zero address for ETH.
        creatorWallet:
          type: string
          description: The EVM wallet that signs and sends.
          required: true
    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: The terms' hash, as embedded in the message. For your records.
    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`.

````