📦

HashLock OTC

Institutional-grade OTC crypto trading with HTLC atomic settlement on Ethereum, Bitcoin, and Sui. Counterparty-risk-free for AI agents — if either side fails, both sides refund automatically via on-chain hash time-locked contracts. ## Tools - **create_trade** — post an RFQ (BUY/SELL) - **accept_quote** — accept a market-maker quote - **confirm_my_lock** — build the on-chain HTLC lock tx for you to sign in your wallet - **confirm_my_claim** — build the preimage-reveal claim tx - **refund_my_lock** — build the refund tx after timelock expiry - **get_trade_status** — query full trade + HTLC state ## Auth Paste your bearer token in the `HASHLOCK_ACCESS_TOKEN` field as `Bearer <token>`. Tokens are 7-day SIWE-issued; obtain one at https://hashlock.markets/mcp/auth (sign in with your Ethereum wallet, no email required). ## Links - Website: https://hashlock.markets - NPM (stdio, alternative): https://www.npmjs.com/package/@hashlock-tech/mcp - GitHub: https://github.com/Hashlock-Tech/hashlock-mcp License: MIT

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Documentation

@hashlock-tech/mcp

Hashlock Markets — trustless, non-custodial OTC trading protocol with zero slippage and DVP (delivery-vs-payment) guarantee. Swap any asset — crypto, RWAs, stablecoins — with sealed-bid RFQ price discovery and HTLC atomic settlement across Ethereum, Bitcoin, and SUI. Agent-friendly via MCP.

Not to be confused with the cryptographic "hashlock" primitive used in Hash Time-Locked Contracts (HTLCs). This package is the MCP server for the Hashlock Markets trading protocol and product at hashlock.markets.

Not affiliated with Hashlock Pty Ltd (hashlock.com), an independent Australian smart contract auditing firm. The two organizations share a similar name by coincidence only — distinct products, legal entities, jurisdictions, and founders.

What is this?

@hashlock-tech/mcp is the canonical Model Context Protocol server for Hashlock Markets — trustless settlement infrastructure for the autonomous economy. It lets AI agents (Claude, GPT, Cursor, Windsurf, any MCP-compatible client) create RFQs, respond as a market maker, fund HTLCs, and settle cross-chain atomic swaps across Ethereum, Bitcoin, and Sui (expanding to Base, Arbitrum, Solana, TON).

Hashlock Markets features 5 industry-first primitives: BTC Collateral Vaults (Sui-native via Hashi), Forward OTC Settlement (T+24h/T+48h), Verified Counterparty Directory, Multi-leg Trade Atomicity, and Execution Rewards with Tiered KYC. Three interaction modes: AI ↔ AI, AI ↔ Human, Human ↔ Human.

Install

Option A (preferred) — Remote streamable-http

Connect Claude Desktop / Cursor / Windsurf directly to the Hashlock Markets MCP endpoint. No local install.

{
  "mcpServers": {
    "hashlock": {
      "url": "https://hashlock.markets/mcp",
      "transport": "streamable-http",
      "headers": {
        "Authorization": "Bearer <token from hashlock.markets/sign/login>"
      }
    }
  }
}

Option B — Local stdio via npx

{
  "mcpServers": {
    "hashlock": {
      "command": "npx",
      "args": ["-y", "@hashlock-tech/mcp"],
      "env": {
        "HASHLOCK_ACCESS_TOKEN": "<token from hashlock.markets/sign/login>"
      }
    }
  }
}

Config file location:

macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
Windows: %APPDATA%\Claude\claude_desktop_config.json

Restart your client after editing.

Authentication

Hashlock Markets uses SIWE (Sign-In With Ethereum) bearer tokens.

Visit hashlock.markets/sign/login
Sign a message with your Ethereum wallet
Receive a 7-day JWT
Set it as HASHLOCK_ACCESS_TOKEN (stdio) or Authorization: Bearer <token> header (remote)
Re-sign after expiry

Available Tools

Tool	Description
`create_rfq`	Create a Request for Quote (RFQ) to buy or sell crypto OTC. Broadcasts to market makers for sealed-bid responses.
`respond_rfq`	Market-maker side: submit a price quote in response to an open RFQ.
`create_htlc`	Fund a Hash Time-Locked Contract for atomic OTC settlement (records on-chain lock tx hash).
`withdraw_htlc`	Claim an HTLC by revealing the 32-byte preimage — settles the atomic swap.
`refund_htlc`	Refund an expired HTLC after timelock — only the original sender, only post-deadline.
`get_htlc`	Query current HTLC status for a trade (both sides, contract addresses, lock amounts, timelocks).

All tools support three chains: Ethereum (EVM), Bitcoin (wrapped HTLC), and SUI (Move HTLC).

Environment Variables

Variable	Required	Default	Description
`HASHLOCK_ACCESS_TOKEN`	Yes	—	7-day SIWE JWT from hashlock.markets/sign/login
`HASHLOCK_ENDPOINT`	No	`https://hashlock.markets/api/graphql`	GraphQL endpoint override (rarely needed)

Tool Examples

Create an RFQ

"Create an RFQ to sell 2 ETH for USDT"

Tool: create_rfq
Input: { baseToken: "ETH", quoteToken: "USDT", side: "SELL", amount: "2.0" }
Output: { rfqId, broadcast status }

Respond to an RFQ

"Quote 3400 USDT per ETH on RFQ abc-123"

Tool: respond_rfq
Input: { rfqId: "abc-123", price: "3400.00", amount: "2.0" }

Check HTLC Status

"What's the HTLC status for trade xyz-789?"

Tool: get_htlc
Input: { tradeId: "xyz-789" }

Fund an HTLC

"Record my ETH lock transaction for trade xyz-789"

Tool: create_htlc
Input: { tradeId: "xyz-789", txHash: "0xabc...", role: "INITIATOR", chainType: "evm" }

Claim with Preimage

"Claim the HTLC using the preimage"

Tool: withdraw_htlc
Input: { tradeId: "xyz-789", txHash: "0xdef...", preimage: "0x1234..." }

Deprecated legacy packages

Do not use these — they depended on an intent REST API that was never shipped, and are superseded by @hashlock-tech/mcp:

hashlock-mcp-server (unscoped, npm) — deprecated 2026-04-19
langchain-hashlock (PyPI) — superseded for MCP-based integrations