Onchain Primitives Lab — 7 immutable primitives on Base

Seven small, focused, single-purpose contracts on Base mainnet. Each one is permissionless, immutable, and routes a small fee to the protocol treasury on every fee-bearing call. 220 tests passing across the suite.

Live on Base mainnet (chainId 8453)

Contract	What it is	Address
StealthAddressRegistry	EIP-5564 stealth meta-address registry	0xD227B45aF37591E6227EB30B757232c1D541c016
SlashablePromiseVault	commit ETH, slash to nemesis if you fail	0xe2b5AfF3e1e05f999BbF48EDD27C4c872b953268
ConditionalTokenDrop	time-gated permissionless airdrop pull	0x8Fb1224e814fcfE4dcd952a6d3DFF722d86862Ae
TimeCapsule	post a sealed-but-readable message at T	0x52E5829b8C71A8F4878B5569Df4255dfeB909a0C
AddressTaggingMarket	stake-weighted attestation market on addresses	0x0288DfE67bE8876D92c0EA41c190b506cd99eD63
GroupBountyPool	n-of-m signers release a shared bounty	0xaB4C7B22B952f99cC8Bf280D17230E8CaDd6CbD4
AtomicSwapHTLC	hash-time-locked atomic swap	0xc3D0CBC815DE1938D4714bf2603b33400f588433

All 7 verified on Basescan. Treasury 0x7a3E312Ec6e20a9F62fE2405938EB9060312E334. Total mainnet deploy spend: 0.000204 ETH. Total tests: 220 passing, 0 failing.

Engineering highlights

• promise-builder (35 tests): ETH-conservation fuzz, malicious-nemesis test, forbids self-slash escape hatches.
• tagging-builder (41 tests): tied-stake-attester-wins (incumbent bias prevents grief), support-extends-deadline (stops last-second bombs).
• capsule-builder: deliberately added peekCiphertext() view so the "bytes are public" warning is concrete.
• drop-builder: flat ETH setup fee instead of % on token total — avoids fee-on-transfer / rebasing edge cases.
• swap-builder: claim/refund windows are strictly disjoint — no race conditions.

Per-contract notes

Each contract has its own *.README.md next to its source in src/. Honest builder demand reads are in LAB_REPORT.md.

Build / test

forge install
forge build
forge test -vv

Part of the THRYX onchain surface

Companion deployments:

• DeadManSwitch: https://github.com/lordbasilaiassistant-sudo/deadman-switch
• Keeper-bounty patterns: https://github.com/lordbasilaiassistant-sudo/keeper-bounty-lab

Project home: https://thryx.fun

Use these contracts

Every address above is clickable straight into Basescan. To call from your own code:

// example: write a stealth meta-address
IStealthAddressRegistry(0xD227B45aF37591E6227EB30B757232c1D541c016).register(meta);

ABIs ship in out/<Contract>.sol/<Contract>.json after forge build. Treasury sink: 0x7a3E312Ec6e20a9F62fE2405938EB9060312E334. Project home with the full THRYX onchain inventory: https://thryx.fun

Built on

• Base — the Ethereum L2 this is deployed on (open-source, OP Stack).
• Foundry — Solidity toolchain for build, test, and deploy.
• Basescan — block explorer used for verification.
• EIP-5564 — stealth address standard implemented by StealthAddressRegistry.
• Claude Code by Anthropic — primary engineering assistant for the THRYX surface.

Support this work

If any of these primitives are useful to you, the easiest way to fund continued maintenance is direct on-chain:

• Treasury address (Base / Ethereum / any EVM): 0x7a3E312Ec6e20a9F62fE2405938EB9060312E334
• Etherscan: https://etherscan.io/address/0x7a3E312Ec6e20a9F62fE2405938EB9060312E334
• Basescan: https://basescan.org/address/0x7a3E312Ec6e20a9F62fE2405938EB9060312E334

The repo's Sponsor button (top of page) wires to the same address via .github/FUNDING.yml.

License

MIT.