Cross-DEX Prices & Spreads

Name: Cross-DEX Prices & Spreads
Author: donnywin85

by donnywin85version 1.0.1i★ –iRuns on your computer

Registry nameio.github.donnywin85/arb-dex-mcp

Install

Overview

Description from the maker (original English)

Live cross-DEX pool prices, liquidity and spreads on 6 EVM chains, read from on-chain pool state.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiVery new↓ 86/wk · ★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Crypto & blockchain
You need to fill in: RAPIDAPI_KEY

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
You fill in yourself: RAPIDAPI_KEY, ARB_DEX_TIMEOUT_MS

Values marked secret are keys to your account. Never share them or paste them into a chat.

You need

npmNode.js installed (for the npx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "arb-dex": {
      "command": "npx",
      "args": [
        "-y",
        "arb-dex-mcp"
      ],
      "env": {
        "RAPIDAPI_KEY": "your-value",
        "ARB_DEX_TIMEOUT_MS": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add arb-dex --env RAPIDAPI_KEY=your-value --env ARB_DEX_TIMEOUT_MS=your-value -- npx -y arb-dex-mcp

Fill in the empty values before running it.

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "arb-dex": {
      "command": "npx",
      "args": [
        "-y",
        "arb-dex-mcp"
      ],
      "env": {
        "RAPIDAPI_KEY": "your-value",
        "ARB_DEX_TIMEOUT_MS": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "arb-dex": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "arb-dex-mcp"
      ],
      "env": {
        "RAPIDAPI_KEY": "your-value",
        "ARB_DEX_TIMEOUT_MS": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

Values you fill in

RAPIDAPI_KEY secret env
Your own RapidAPI key for the Multi-Chain DEX Prices & Liquidity API (https://rapidapi.com/donnydev/api/multi-chain-dex-prices-liquidity). The free-tier subscription is enough to start. Required for…
ARB_DEX_TIMEOUT_MS env
Optional request timeout in milliseconds. Defaults to 45000 — a full-chain live scan is a real on-chain sweep and can take ~30s.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 10, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account donnywin85, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Crypto & blockchaini

More stars than 0% of the other 1632 servers in this category
Published to the registry more recently than 37% of the other 1632 servers in this category
Basic checks equal to or better than 100% of the other 1632 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Cross-DEX Prices & Spreads safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

You need to fill in: RAPIDAPI_KEY

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (1.0.1) reached the registry 3 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: Déjà — la bourse du raisonnement, Crypto Regime MCP, XPayr Non-Custodial Crypto Gateway & AI Agent Commerce MCP

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:↓ Downloads per weeki★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

Déjà — la bourse du raisonnement

Reasoning exchange for AI agents: buy analyses others already did, sell yours. USDC on Solana.

by MistelGeehrtUpdated today

Runs on your computer

Install

Crypto Regime MCP

Crypto trend and regime MCP tools with automatic x402 payments or prepaid credits.

by ShicodiezEarlyUpdated today

Computer or cloud

Install

XPayr Non-Custodial Crypto Gateway & AI Agent Commerce MCP

21 MCP tools for non-custodial crypto checkout, USDT/USDC links, webhooks, and AI agents.

by xpayrcomVery newUpdated today

Runs on your computer

Install

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

arb-dex-mcp

Live cross-DEX crypto prices for your AI agent — per-venue pool price, pool liquidity and the gross cross-venue spread on 6 EVM chains, read straight from on-chain pool state.

Chains: BSC · Polygon · Arbitrum · Base · Avalanche · Optimism. Venues: PancakeSwap (v2 + v3), Uniswap v3, SushiSwap, QuickSwap, Biswap, ApeSwap, BaseSwap, Trader Joe, Pangolin — every v2-style pool and every v3 fee tier separately, because a $12k 1% pool and a $19M 0.01% pool are not the same quote.

Nothing is modelled, estimated or backfilled. Every payload states its own block number and carries its own scope note, so an agent that quotes a figure also has the caveats attached to it.

Works with no API key against a free hourly public snapshot. Docs · npm

Quickstart

Nothing to clone or build. Your MCP client fetches the package. Requires Node 18+.

Claude Desktop

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

"mcpServers": { "arb-dex": { "command": "npx", "args": ["-y", "arb-dex-mcp"], "env": { "RAPIDAPI_KEY": "your-rapidapi-key-here" } } } }

Restart Claude Desktop; the six tools appear under the connectors icon. Drop the `env` block entirely to run keyless — the server still starts and the free-snapshot tools still answer.

Claude Code

claude mcp add arb-dex --env RAPIDAPI_KEY=your-rapidapi-key-here -- npx -y arb-dex-mcp

Keyless:

claude mcp add arb-dex -- npx -y arb-dex-mcp

Then /mcp to confirm it connected.

Cursor

~/.cursor/mcp.json (global) or .cursor/mcp.json (per project):

"mcpServers": { "arb-dex": { "command": "npx", "args": ["-y", "arb-dex-mcp"], "env": { "RAPIDAPI_KEY": "your-rapidapi-key-here" } } } }

Cursor → Settings → MCP shows the server and its tools once the file is saved.

Any other MCP client

Same three facts: command npx, args ["-y", "arb-dex-mcp"], transport stdio, optional env RAPIDAPI_KEY.

Try it

Real prompts, and the real shape that comes back. Payloads below were measured live on 2026-08-15; they are trimmed for width but nothing is invented.

1. "What is WBNB/USDT trading at on every BSC venue right now?"

get_prices reads every pool holding the pair — v2 pairs and each v3 fee tier separately — at one stated block:

"pair": "WBNB/USDT", "network": "bsc", "chainId": 56, "blockNumber": 116151268, "pricesByVenue": [ { "venue": "pancake", "surface": "v2", "feeBps": 25, "price": 611.7347, "tvlUsd": 56834814.36 }, { "venue": "biswap", "surface": "v2", "feeBps": 10, "price": 610.8278, "tvlUsd": 415733.94 }, { "venue": "apeswap", "surface": "v2", "feeBps": 20, "price": 611.1244, "tvlUsd": 3659.06 }, { "venue": "pancakeV3:1", "surface": "v3", "feeBps": 1, "price": 610.5684, "tvlUsd": 18596810.32 }, { "venue": "pancakeV3:5", "surface": "v3", "feeBps": 5, "price": 610.6531, "tvlUsd": 4941099.44 }, { "venue": "pancakeV3:25", "surface": "v3", "feeBps": 25, "price": 610.6304, "tvlUsd": 52534.35 }, { "venue": "pancakeV3:100", "surface": "v3", "feeBps": 100, "price": 609.1025, "tvlUsd": 12206.21 } ], "bestBuy": { "venue": "pancakeV3:100", "price": 609.1025 }, "bestSell": { "venue": "pancake", "price": 611.7347 }, "midSpreadBps": 43.22, "crossDex": { "grossSpreadBps": 0, "grossUsd": 0, "optimalInput": { "amount": 0, "token": "WBNB", "usd": 0 }, "buyVenue": "-", "sellVenue": "-" }, "liquidity": { "venues": 7, "totalTvlUsd": 80856857.67 }, "source": "rpc" }

Read the two spread numbers against each other. The raw mid spread is 43 bps — and the gross capturable spread is 0. The 609.10 quote lives in a $12k pool; the size that would actually clear it moves the price past the gap before you get there. A tool that reported only the 43 bps would be handing an agent a number it cannot trade. This one reports both, and optimalInput is where the honesty lands.

2. "Show me the cross-DEX spreads on Base — are any actually capturable?"

get_spreads sweeps a whole chain and ranks by gross USD at the optimal size, not by headline basis points:

"network": "base", "chainId": 8453, "scannedPairs": 11, "opportunities": [], "found": 0, "filters": { "minSpreadBps": 10, "minVenueTvlUsd": 1000, "minGrossUsd": 0.01, "limit": 5 }, "ranking": "gross USD at the optimal trade size, NOT raw spread — a large spread with a tiny optimal size is not an opportunity", "scope": "GROSS cross-venue spread from live pool state, BEFORE gas, MEV and any slippage beyond the optimal size. Not a profit estimate and not trade advice. Venues below the liquidity floor are excluded because a spread against a dust pool is an artefact, not an opportunity.", "elapsedMs": 2847 }

`found: 0` is a real answer and it is the common one. Eleven pairs scanned, nothing cleared the floor. Venues under $1,000 TVL are dropped outright. When rows *do* come back, each carries capturable, warning and shallowestSideTvlUsd so a big basis-point number cannot mislead on its own. This tool will tell your agent there is nothing there — which is the whole point of asking it.

3. "How much history does arb-dex actually have, and for which chains?"

get_history_summary sizes the archive *before* you query it:

"rows": 133, "rowsWithPairDetail": 103, "rowsByEra": { "digest-totals-only": 30, "top-list-pairs": 5, "full-sweep": 98 }, "pairsTracked": 107, "firstAt": "2026-08-10T17:35:09.355Z", "lastAt": "2026-08-15T20:54:34.417Z", "spanHours": 123.32, "chainsSeen": ["arbitrum", "avalanche", "base", "bsc", "optimism", "polygon"], "pairs": [ { "chain": "polygon", "pair": "WBTC/USDC", "observations": 103, "qualifiedObservations": 39 }, { "chain": "bsc", "pair": "BTCB/USDT", "observations": 99, "qualifiedObservations": 15 }, { "chain": "arbitrum", "pair": "ARB/USDC", "observations": 98, "qualifiedObservations": 0 } ] }

Coverage is only what was measured. A gap stays a gap — rowsByEra says how much detail each era of rows carries, and ARB/USDC having 98 observations but 0 qualified is the archive telling you that pair has never once cleared the spread floor.

Tools

Tool	What it answers	Access
`get_chains`	Which chains are covered, their chain IDs, tokens and DEX venues	Any key · keyless returns the chain list only, and says so
`get_pairs`	What is priceable on one chain: token universe, venues, pair syntax	Any key · keyless returns the measured subset, labelled as such
`get_prices`	One pair's price at every venue holding a pool for it, plus reserves, TVL, fee tier and the cross-DEX spread	Any key
`get_spreads`	A whole chain's cross-venue dislocations, ranked by gross USD at the optimal size	Any key for `live: true` · keyless serves the free hourly snapshot
`get_history_summary`	What the measurement archive covers: rows, pairs tracked, chains seen, span, retention	Any key (free tier included)
`get_history`	One pair's per-venue price/liquidity series and gross cross-venue spread over 24h / 7d / 30d	PRO plan — see Plans

The two history tools read the service's own measurement archive, so they answer the question the live tools cannot: whether a dislocation *persisted* or was a single sample. Sampling is roughly hourly, and gaps are never interpolated or backfilled. Call get_history_summary first to see what span exists before asking for a window.

What it will not do

Spreads are gross — before gas, MEV and slippage beyond the optimal size. Not a profit estimate and not trade advice.
It never fabricates a row. Without a key, get_chains, get_pairs and get_spreads answer from the free public surface and each carries a limitation field naming exactly what a key would add. get_prices, get_history_summary and get_history return an explicit key-required error with the signup link rather than a thinner answer dressed up as a full one.
It does not execute trades, hold funds, or touch a wallet. It is read-only market data.
This package ships no credentials of any kind. The key is yours and stays in your config.

Get a key

The paid tools call the API through RapidAPI using your own key.

Subscribe — there is a free tier: https://rapidapi.com/donnydev/api/multi-chain-dex-prices-liquidity
Copy your X-RapidAPI-Key from the RapidAPI dashboard.
Put it in RAPIDAPI_KEY in the config above — never in code, and never in a commit.

Plans

Five of the six tools work on the free tier. Only the per-pair history series is gated:

Plan	Adds
BASIC ($0)	Live quotes on every chain, plus `get_history_summary` so you can size the archive before you buy it
PRO ($15/mo)	`get_history` — the measured per-venue series for one pair, 24h window, 1000 calls/mo
ULTRA ($49/mo)	No window limit and no history meter, plus depth/slippage and spread alerts
MEGA ($149/mo)	Bulk paging over the complete archive for your own store

Calling get_history below PRO returns an explicit tier_required error naming the plan and the upgrade URL — it does not fail silently or return an empty series.

Configuration

Env var	Default	Purpose
`RAPIDAPI_KEY`	—	Your RapidAPI key. Required for the paid tools.
`ARB_DEX_TIMEOUT_MS`	`45000`	Request timeout. A live full-chain sweep is a real on-chain read and can take ~30s.
`ARB_DEX_FREE_BASE_URL`	production origin	Override the free-surface host.
`ARB_DEX_RAPIDAPI_HOST`	`multi-chain-dex-prices-liquidity.p.rapidapi.com`	Override the RapidAPI host.

Set these in your MCP client's env block (see the configs above). .env.example ships in the package and documents the same variables for local runs from a clone.

Test

The test suite is not in the npm tarball — run it from a clone:

git clone https://github.com/donnywin85/arb-dex-mcp.git

cd arb-dex-mcp && npm install

npm run selftest # keyless: exercises the free fallbacks RAPIDAPI_KEY=... npm run selftest # keyed: exercises the paid routes

The test spawns the server over stdio and calls every tool against the real production API — nothing is mocked. It asserts on live values (block number, per-venue prices, scanned-pair counts), so a run that passes is evidence the data path works end to end.

Cross-DEX Prices & Spreads

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

Values you fill in

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Crypto & blockchaini

Common questions

Alternatives

Déjà — la bourse du raisonnement

Crypto Regime MCP

XPayr Non-Custodial Crypto Gateway & AI Agent Commerce MCP

README from the maker

arb-dex-mcp

Quickstart

Claude Desktop

Claude Code

Cursor

Any other MCP client

Try it

1. "What is WBNB/USDT trading at on every BSC venue right now?"

2. "Show me the cross-DEX spreads on Base — are any actually capturable?"

3. "How much history does arb-dex actually have, and for which chains?"

Tools

What it will not do

Get a key

Plans

Configuration

Test

Links