Chord

Chord

Non-custodial trading API and AI agent. One quote call finds the best route across the DEXs of seven EVM chains(Monad, Robinhood Chain, Arc, Avalanche, Base, BNB Chain and Arbitrum One), and one router contract executes it in asingle transaction. Next to trading, Chord keeps a live index of swaps, holders, LP positions and wallet PnL on thosechains and on Solana, which apps and AI agents can query.

• App (Ask, AI trading agent + wallet): https://getchord.xyz/ask
• Docs and API reference: https://getchord.xyz/docs
• API: https://api.getchord.xyz/v1 (what each chain serves: https://api.getchord.xyz/v1/chains)
• Status, measured every minute from Cloudflare: https://getchord.xyz/status
• Hosted MCP server: https://api.getchord.xyz/v1/mcp

Chord started as NullTerminal, a DEX aggregator on Monad. Contract and package names that start with Null comefrom that period; the Chord* contracts in contracts/src/chord/ are the current builds of the same code.

Use it from an AI agent

The hosted MCP server needs no key and no install (Streamable HTTP). ?chain=<key> pins a default chain.

claude mcp add --transport http chord https://api.getchord.xyz/v1/mcp

17 tools, each taking a chain: chord_chains, chord_status, chord_overview, chord_tokens, chord_search,chord_token, chord_trades, chord_candles, chord_wallet, chord_wallet_trades, chord_smart_money,chord_holders, chord_lp_pools, chord_lp_positions, chord_quote, chord_swap_tx and chord_ask. Nothing signsor sends: chord_swap_tx returns an unsigned transaction, the approval it needs and a simulation run as the taker.

Listed in the official MCP Registry as io.github.getchordlabs/chord (server.json in this repository) and onSmithery as tuantqse90/chord. Other ways in: the REST API with itsOpenAPI spec (openapi/), the Agent Skill (skills/chord/), the Docs MCP at https://getchord.xyz/docs/mcp and thefunction-calling manifest at https://api.getchord.xyz/v1/mcp/tools.json.

Chains

GET /v1/chains answers the same table with the route behind each capability.

What is in this repository

The routing engine (Rust) and the API server (TypeScript) are not in this repository. They run behindapi.getchord.xyz.

Contracts

The three proxies sit at the same addresses on all seven EVM chains (aligned deployer nonces):

Every adapter pins the router as an immutable and reverts NotRouter for any other caller. The router only callsadapters the registry approves. Fees are set on-chain by FeeCollector.feeBpsFor(outputToken): 5 bps by default onevery chain, 0 bps for stablecoins, majors and the listed tokenized stocks on Robinhood Chain.

Robinhood Chain (chain id 4663)

Router upgrade on Robinhood Chain: tx 0x9111f311319d778d2b53cce16fe7d471a15e61b8e00bdd08de074a5bcc571aa3.

Arbitrum One (chain id 42161, deployed 2026-10-14)

All verified on Sourcify. Each venue was swapped both ways on mainnet through the router before the engine routed it.

Build and test

git submodule update --init --recursive
cd contracts
forge build
forge test --no-match-contract 'ForkTest$'

Since the buildathon (Oct 5 to Oct 15, 2026)

• Arbitrum One: aligned Chord stack, deploy script and fork test (edd957a), swaps and the Ask side (c28203c),public on Oct 15 (ca79736).
• New venues: Metric v1 on Monad and Avalanche (80daf2c, 23bfe8c), ERC-4626 deposit on Monad, which mintsaprMON, shMON and gMON at the vault's rate when pools price below it (a41a703), WOOFi (83283af), Camelot V3through the Algebra Integral adapter (454091c), DODO V2 on Avalanche and Arbitrum (1975d08), LFJ Liquidity Bookv2.1 (147f862), and two concentrated-liquidity factories on Arc through ChordV3Adapter r3 (95e65be).
• Agents: the stdio agent became a bridge to the hosted MCP server (02f7201), wallet trades on every chain(5256c20), Solana data, smart traders and LP routes in the OpenAPI spec and the skill (710b14d, 74957c2,d13d3ef), a docs page per network (0306a08).

Work done during the Arbitrum Open House Singapore Buildathon (Sep 13 to Oct 4, 2026)

Chord existed before the buildathon. This repository was extracted from our monorepo with its real commit historyfor these folders, so every commit dated 2026-09-13 or later was made during or after the buildathon(git log --since=2026-09-13). Highlights:

• ChordRouter: Chord-named implementations of router, registry and fee collector (08dcb96), and a script thatupgrades only the router proxy, used on Robinhood Chain, Monad and Arc on Oct 2 (dfb5386).
• Robinhood Chain cross-chain buys: RhTokenZap, a generic destination zap through the router, andSwapAndBridgeCCTP, swap plus Circle CCTP burn in one call (9814cba).
• New adapters: UniV2TaxSafeAdapter, priced from what the pair actually received (0dc387b); Uniswap V4 withnative USDC on Arc (0cc5ff3); ChordSolidlyAdapter (3775c10, f9a6fae); ChordLBPairAdapter (b3136f1);ChordAlgebraIntegralAdapter (b20d1de); ChordInfinityCLAdapter (95db92d).
• Agent surfaces: Agent Skill (014875e), Docs MCP (54ffb71), agent tools for Arc, LP and themeta-aggregator (98cd499, d751aeb, ad9f222), OpenAPI spec kept in line with the API (3c4ea54, 5130d2a).
• Ask wallet on Robinhood Chain (mostly in the closed API and web app, partly here): USDC on Arbitrum convertsto USDG on Robinhood Chain with one signature (609f37a), explicit Convert and multi-chain wallet (f2b4244).

License

MIT, see LICENSE. It covers everything in this repository: contracts, agent, skill, Docs MCP, OpenAPI specand SDK. The submodules in contracts/lib/ keep their own licenses (OpenZeppelin MIT, forge-std MIT or Apache-2.0).Sources verified on-chain before 2026-10-15 still read SPDX-License-Identifier: UNLICENSED; the code is the same andis MIT from that date.