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Crypto Pen Pals

Get matched with another builder in a different ecosystem, chat via XMTP, and share what you're building.

Intermediate
Social Apps
Social & Community
2–4 weeks

Overview

A matching service that pairs builders across ecosystems for async XMTP chats and optional onchain intro cards.

Problem

Builders in siloed ecosystems rarely meet peers elsewhere who could share patterns, intros, and feedback.

Suggested Features

  • ·Ecosystem-based matching
  • ·XMTP encrypted chat
  • ·Builder profile cards
  • ·Opt-in match scheduling

Suggested APIs

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XMTP

OSS

Wallet-to-wallet messaging protocol for encrypted onchain DMs.

EthereumBase
Free

Privy

Wallet onboarding and embedded wallet infrastructure for apps.

EthereumBase+1
Free
Freemium

Farcaster

OSS

Decentralized social protocol for feeds, frames, and mini apps.

EthereumBase
Free

Suggested Ecosystems

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Ethereum

The leading smart contract platform and DeFi hub.

Base

Coinbase L2 with fast, low-cost EVM transactions.

Solana

High-throughput chain with low fees and fast finality.

Sui

Move-based L1 with parallel transaction execution.

Related Recipes

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XMTP Inbox
XMTP Inbox

Community wallet-to-wallet chat app built on XMTP for encrypted DMs between addresses.

Demo App
wallet-dm
Open Source
GitHub
EthereumBase
Intermediate1 Hour
View RecipeSourceGitHub
Chatter
Chatter

XMTP chat app template using Next.js and Privy for wallet login and messaging.

Template
turbo-eth
Open Source
GitHub
EthereumBase
Beginner1 Hour
View RecipeSourceGitHub

Related Ideas

Proof of Ship

Builders log what they shipped each week, verified by GitHub commits, with a public leaderboard.

Intermediate · 2–4 weeks

Examples

XMTP