send.fun: launchpad and DEX SDK on Solana

send.fun is a Solana launchpad with a bonding curve, then its own constant-product DEX after the token migrates. Creators launch. Traders buy and sell. Builders integrate through a partner key. Product: send.fun. Docs: docs.send.fun.

The TypeScript package is @send-fun/sdk. The Rust crate is sendfun-sdk. Both build instructions. Neither sends a transaction. Docs say that twice. Start at /llms.txt and quick start.

The three programs

IDLs live in send-fun/sendfun-idl. Launchpad is create / buy / sell / migrate. DEX is post-migration AMM. Nexus is staking, airdrops, creator fees, partner fee config.

Happy path

Apply for a partner key if you route trades. Registered partners pay zero protocol fees on those routes. No key: use constants.DEFAULT_PARTNER and the default rates.

pnpm add @send-fun/sdk @solana/kit @solana/program-client-core
# cargo add sendfun-sdk --features fetch

import { constants, launchpad, math, nexus, utils } from "@send-fun/sdk"
import { address, createSolanaRpc } from "@solana/kit"

const rpc = createSolanaRpc("https://api.mainnet-beta.solana.com")
const quoteMint = constants.WSOL_MINT
const baseMint = address("YourTokenMint11111111111111111111111111111")
const [curvePda] = await launchpad.pda.findBondingCurvePda({
  baseMint,
  quoteMint,
})

Namespaces in both SDKs: constants, launchpad, dex, math, nexus, utils. Quote with math. You still assemble, sign, and send with @solana/kit.

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