> ## 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. # Build the purps.lol launch > Step 2. The same terms as prepare, plus the coin's image and socials, `ts` and `signature`. We upload the metadata, build the launch transaction (and a SOL-to-pair swap in front of it when the pair is not SOL and there is a dev buy), simulate it, and record the launch as pending. You get back unsigned transactions and the throwaway mint key. Sign each transaction with the creator wallet, and the one at `createIndex` with the mint key as well, then send them in order through /transactions/send. The launch goes live on its own once the pool exists on chain; poll /launches/{mint}. ## OpenAPI ````yaml https://purps.lol/api/v1/openapi.json post /launches/submit 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: /launches/submit: post: tags: - Launch on purps.lol summary: Build the purps.lol launch description: >- Step 2. The same terms as prepare, plus the coin's image and socials, `ts` and `signature`. We upload the metadata, build the launch transaction (and a SOL-to-pair swap in front of it when the pair is not SOL and there is a dev buy), simulate it, and record the launch as pending. You get back unsigned transactions and the throwaway mint key. Sign each transaction with the creator wallet, and the one at `createIndex` with the mint key as well, then send them in order through /transactions/send. The launch goes live on its own once the pool exists on chain; poll /launches/{mint}. operationId: submitLaunch requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/LaunchSubmit' responses: '200': description: The transactions to sign. content: application/json: schema: type: object properties: ok: type: boolean enum: - true data: $ref: '#/components/schemas/SolanaBuild' '400': description: Every failure carries the same envelope. content: application/json: schema: $ref: '#/components/schemas/Error' '401': description: Every failure carries the same envelope. content: application/json: schema: $ref: '#/components/schemas/Error' '403': 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' '503': description: Every failure carries the same envelope. content: application/json: schema: $ref: '#/components/schemas/Error' components: schemas: LaunchSubmit: type: object description: 'Everything in LaunchTerms, plus:' properties: image: type: string description: >- The coin's logo as a data URL (`data:image/png;base64,…`). PNG, JPEG, WebP or GIF, 512KB max. Send this or `imageUrl`. imageUrl: type: string description: >- A public https link to the logo instead of `image`. Fetched by us under the same size and type rules. description: type: string description: Up to 500 characters. website: type: string description: https:// link. Defaults to the coin's purps.lol page. twitter: type: string description: https:// link. telegram: type: string description: https:// link. ts: type: integer description: The `ts` the prepare step returned. required: true signature: type: string description: >- Your wallet's signature over the prepared message. Base58 on Solana, 0x-hex on Robinhood Chain. required: true SolanaBuild: type: object properties: mint: type: string description: The new coin's mint address. poolId: type: string description: The curve pool (purps.lol launches only). nullable: true transactions: type: array description: Base64 transactions to sign and send in order. items: type: string createIndex: type: integer description: >- Which of `transactions` is the create. Sign that one with the mint key as well. mintSecret: type: string description: >- The mint keypair's secret, base58. Powerless after the launch; use it once to countersign the create. nullable: true imageUrl: type: string description: Where the logo was stored. nullable: true url: type: string description: The coin's future page. 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`. ````