Base Vault is an on-chain mystery puzzle game built on Base. Players crack ciphers and answer cryptic challenges across escalating tiers to earn rare, non-purchasable NFTs. Everything — progression, payments, and rewards — is recorded on Base mainnet.

The core idea: every reward is earned, not bought. Only players who prove their skill across all three tiers can claim a Vault Legend.

A wallet on Base is required to play and track progress.

• > TIER 1 — Free. Solve 3 terminal ciphers (Caesar, binary, logic, crypto, math). 3 wrong answers locks the wallet for a short cooldown.
• > TIER 2 — Mint the Vault Key NFT (33 USDC) to unlock the next chamber.
• > TIER 3 — Mint the Master Key NFT (66 USDC) for the final descent.
• > CLAIM — Complete all tiers, get allowlisted, and mint your Vault Legend (gas only).

The game UI is available in English, German, Arabic, Chinese and Japanese — puzzles and AI hints included.

• 👑 Vault Legend — the grand prize. Only 333 will ever exist, across 3 phases: Early (1–33), Core (34–133), Final (134–333). Cannot be bought, traded for, or gifted into — only earned.
• 🔑 Vault Key / Master Key — tiered access NFTs that gate Tier 2 and Tier 3.
• 💎 Vault Points (VP) — an ERC-20 reward token earned on tier completion.
• 📊 Vault Leaderboard — completion scores recorded on-chain.

Stuck on a cipher? The Vault Shop sells premium hints for 0.01 USDC, paid instantly with the x402 protocol on Base — no checkout, no account.

• 1. The client signs an EIP-3009 transferWithAuthorization (gasless) — one wallet signature, no gas.
• 2. The server returns HTTP 402 with payment requirements, then verifies and settles the payment.
• 3. Settlement runs through the Coinbase CDP facilitator for real USDC settlement on Base mainnet.
• 4. The hint unlocks. A Builder Code attribution is declared on the resource server.

The Vault Guardian is an AgentKit agent (ViemWalletProvider on Base mainnet, with wallet + ERC-20 action providers) wired to Claude. It gives cryptic, adaptive hints that grow more helpful the more you struggle — without ever revealing the answer.

The Guardian replies in the player's selected language, matching the rest of the UI.

All deployed and verified on Base mainnet:

• · Next.js (App Router) · TypeScript · Tailwind
• · wagmi + viem + RainbowKit (multi-RPC fallback on Base)
• · Solidity (ERC-721 / ERC-20), verified on Basescan
• · x402 + @coinbase/x402 (CDP facilitator) for payments
• · @coinbase/agentkit + Claude for the Vault Guardian
• · Farcaster Mini App · IPFS (Pinata) for NFT metadata

• 🌐 App — vaultgame.online
• 💻 GitHub — github.com/izzetcakmak/base-vault
• 🔵 Base — base.org