Chord

npx add-mcp 'https://api.getchord.xyz/v1/mcp'

Chord

Non-custodial trading API and AI agent. One quote call finds the best route across the DEXs of eight EVM chains (Ethereum, Monad, Robinhood Chain, Arc, Avalanche, Base, BNB Chain and Arbitrum One), and one router contract executes it in a single transaction. On Solana, Chord quotes swaps through its own Solana router and Jupiter and returns an unsigned transaction for the user's wallet. Next to trading, Chord keeps a live index of swaps, holders, LP positions and wallet PnL on all nine chains, 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 come from 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
gemini extensions install https://github.com/getchordlabs/chord   # Gemini CLI, reads gemini-extension.json

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 signs or 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 on Smithery as tuantqse90/chord. Other ways in: the REST API with its OpenAPI spec (openapi/), the Agent Skill (skills/chord/), the Docs MCP at https://getchord.xyz/docs/mcp and the function-calling manifest at https://api.getchord.xyz/v1/mcp/tools.json.

Chains

Chain	Chain id	Swaps (quote + unsigned transaction)	Data
Ethereum	1	yes	tokens, trades, candles, wallet PnL
Monad	143	yes	tokens, trades, candles, wallet PnL, smart money, LP
Robinhood Chain	4663	yes	tokens, trades, candles, wallet PnL, smart money, holders, LP
Arc	5042	yes	tokens, trades, candles, wallet PnL, smart money, holders, LP
Avalanche C-Chain	43114	yes	tokens, trades, candles, wallet PnL
Base	8453	yes	tokens, trades, candles, wallet PnL
BNB Chain	56	yes	tokens, trades, candles, wallet PnL
Arbitrum One	42161	yes	tokens, trades, candles, wallet PnL
Solana	none	yes, through /v1/sol/trade/* (not in the MCP tools yet)	tokens, trades, candles, wallet PnL, smart traders, LP

GET /v1/chains answers the same table with the route behind each capability (Solana swaps live under /v1/sol/trade/*, outside that table).

What is in this repository

Folder	Contents
contracts/	Foundry project: ChordRouter (UUPS), AdapterRegistry, FeeCollector, one adapter per venue family (Uniswap V2/V3/V4, Algebra and Algebra Integral, Solidly, Liquidity Book, PancakeSwap Infinity, Metric, WOOFi, DODO V2, ERC-4626 deposit, Curve, Balancer and more), RhStockZap / RhTokenZap for cross-chain buys on Robinhood Chain, SwapAndBridgeCCTP, deploy scripts and fork tests per chain
agent/	chord-agent: a stdio bridge to the hosted MCP server for clients that only speak stdio, and the function-calling manifest (tools.json)
skills/chord/	Agent Skill for Claude Code, Codex and other agents: SKILL.md, references with live API output, chord.py client
docs-mcp/	Docs MCP server (stdio, and hosted at https://getchord.xyz/docs/mcp)
openapi/	OpenAPI spec of the public API (openapi.json) and the script that builds it
sdk/	The original TypeScript SDK from the Monad period

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

Contracts

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

Contract	Address
ChordRouter (UUPS proxy)	0x1b1fee89a381e595fe6536b99ba91f3e16e9601a
AdapterRegistry (UUPS proxy)	0x6cf25d2af1a58d7094b0ac253ae616a8e1f2ea3f
FeeCollector (UUPS proxy)	0x6c66229675fd9ceda9a9b2ea2bd983b3d8255834

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

Robinhood Chain (chain id 4663)

Contract	Address
ChordRouter implementation (upgraded 2026-10-02)	0x209e38890533469337488588cB9e4A44943EE8FE
Uniswap V4 adapter	0x3622116c527896Ab9C1510A45f3344AaBD03973a
V3 any-fork adapter (Uniswap V3, Ramses and other V3 forks)	0x3A7D13a420c8FBC29Bf4A1feDB22A5Dae3A8913E
V2 adapter	0xC4b930D9E5d20cc8b4C67f2118FE0cD8E6e36b72
Algebra adapter	0x63bd5402aCC3129c9b38c7d52f327b82f24B497D
RhStockZap	0x66627Ce32af8801525930B7C2a1Db4905193bb51

Router upgrade on Robinhood Chain: tx 0x9111f311319d778d2b53cce16fe7d471a15e61b8e00bdd08de074a5bcc571aa3.

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

Contract	Address
ChordRouter implementation	0x1cd8CeED960dE0c9787295c8F1BF278D4A36698c
ChordV3Adapter (Uniswap V3, PancakeSwap V3, SushiSwap V3)	0xd55fe37e30435cF15fe2C7fcAAF1aBf19d13b195
ChordV2Adapter (Uniswap V2, SushiSwap V2)	0xa61C202C4c989a1724E1B432C96A9f064856574d
ChordV4Adapter	0xFE82b7714c36083AB518067f03680C59ac57840a
ChordMetricV1Adapter	0x4e48D8bEDB4A781493e6193776FDa37e57Ce07b1
ChordAlgebraIntegralAdapter (Camelot V3)	0x3D26860E5d5ddE28FDcd11e14573CE7b103fA081
ChordWooFiAdapter	0xfdC2e11793197B9D16Ae1eDBa8049dcc9Fc15748
ChordDodoV2Adapter	0x3E46e23C171aAC3124D85BbCa33A2C0422342fA4

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

Ethereum (chain id 1, deployed 2026-10-15)

Same addresses as on Arbitrum One for the router implementation and the three core adapters:

Contract	Address
ChordRouter implementation	0x1cd8CeED960dE0c9787295c8F1BF278D4A36698c
ChordV3Adapter (Uniswap V3, PancakeSwap V3, SushiSwap V3)	0xd55fe37e30435cF15fe2C7fcAAF1aBf19d13b195
ChordV2Adapter (Uniswap V2, SushiSwap V2)	0xa61C202C4c989a1724E1B432C96A9f064856574d
ChordV4Adapter	0xFE82b7714c36083AB518067f03680C59ac57840a

All 9 contracts of the stack match on Sourcify; every venue was swapped both ways on mainnet before going public.

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).
• Ethereum: aligned Chord stack, deploy script and fork test (79233bc), swaps and the Ask side (8a46f39), tokens that need approve(0) first such as USDT (69a06af), public on Oct 15 (38b466e).
• New venues: Metric v1 on Monad and Avalanche (80daf2c, 23bfe8c), ERC-4626 deposit on Monad, which mints aprMON, shMON and gMON at the vault's rate when pools price below it (a41a703), WOOFi (83283af), Camelot V3 through the Algebra Integral adapter (454091c), DODO V2 on Avalanche and Arbitrum (1975d08), LFJ Liquidity Book v2.1 (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).
• Solana swaps: Chord's own Solana router and Jupiter in the public docs and the skill (ee2d912), open to everyone on Oct 15 (41b3fdc).

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 history for 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 that upgrades 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, and SwapAndBridgeCCTP, swap plus Circle CCTP burn in one call (9814cba).
• New adapters: UniV2TaxSafeAdapter, priced from what the pair actually received (0dc387b); Uniswap V4 with native 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 the meta-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 converts to 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 spec and 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 and is MIT from that date.