Swap API MCP server

by Swap-API·io.github.Swap-API/mcp·v0.1.0·22 stars

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MCP server for SwapAPI - get executable token swap calldata for EVM chains

B80/100grade B

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Safety scan

B80/100

full report

Adoption

Growing

22 stars36 downloads/wk

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If you have run it, two minutes of your experience saves the next person an afternoon.

Swap API tools (1)

write = sends, deletes, buys or posts

Read from the package source without running it. The installed server may list more.

swap_tokens
Get executable call data to swap tokens on EVM chains. Returns transaction data ready to submit on-chain.

Public scan report

scanner v0.1.10 · 2026-09-27 · same rubric, same numbers if you re-run it

no findings

Code scan3 source files scanned25/25
–Live reliabilityno gateway calls yet and no remote to proben/a
–Tool poisoningtools not inspected (local package is not executed); not countedn/a
Auth qualitylocal package, no credentials required12/15
Maintenancelast push 178 days ago8/15
Maintainer identityregistry namespace matches repository owner7/10

Overall 80/100. Components that don't apply are left out of the denominator. Any critical finding is an F.Rubric Appeal a finding JSON

How Swap API compares

Against every graded MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score: 80/100; higher than 60% of 48,255 servers
Tools: 1; the typical server has 7
Tools that change things: 0%; typical: 0%. Fewer write tools means less an agent can break
GitHub stars: 22; more than 91% of 28,688 servers
Downloads a week: 36; more than 26% of 12,191 servers with a package

What its tools let an agent do: 1 read

Install Swap API in Claude Code, Cursor or VS Code

Runs npx -y @swapapi/mcp on your machine. Read the scan report first; the gateway never runs local packages.

claude mcp add mcp -- npx -y @swapapi/mcp

Add to Cursor

What the publisher says

From the Swap API repository's README, as published. We do not edit it. Read it on GitHub

Swap API

Executable token swap calldata in one GET request. No API keys. No accounts. No SDK bloat.

https://api.swapapi.dev

Quick Start

Swap 1 ETH for USDC on Ethereum:

curl "https://api.swapapi.dev/v1/swap/1?\
tokenIn=0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE&\
tokenOut=0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48&\
amount=1000000000000000000&\
sender=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"

That's it. The response contains everything you need to sign and broadcast.

Example Response

{
  "success": true,
  "data": {
    "status": "Successful",
    "tokenFrom": {
      "address": "0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE",
      "symbol": "ETH",
      "name": "Ether",
      "decimals": 18
    },
    "tokenTo": {
      "address": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
      "symbol": "USDC",
      "name": "USD Coin",
      "decimals": 6
    },
    "swapPrice": 2435.12,
    "priceImpact": 0.0003,
    "amountIn": "1000000000000000000",
    "expectedAmountOut": "2435120000",
    "minAmountOut": "2422947280",
    "tx": {
      "from": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
      "to": "0x011E52E4E40CF9498c79e329EBc29ed08c8B5abB",
      "data": "0x2646478b...",
      "value": "1000000000000000000",
      "gasPrice": 30000000000,
      "gas": "250000"
    }
  },
  "timestamp": "2026-03-12T00:00:00.000Z"
}

API Reference

Endpoint: GET /v1/swap/{chainId}

Parameters:

Response codes:

200 — Quote ready
400 — Invalid params or unsupported chain
429 — Rate limit exceeded (60/min per IP)
502 — Upstream service error

More Curl Examples

Base (ETH → USDC)

curl "https://api.swapapi.dev/v1/swap/8453?\
tokenIn=0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE&\
tokenOut=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913&\
amount=500000000000000000&\
sender=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"

Arbitrum (USDC → ETH with 1% slippage)

curl "https://api.swapapi.dev/v1/swap/42161?\
tokenIn=0xaf88d065e77c8cC2239327C5EDb3A432268e5831&\
tokenOut=0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE&\
amount=1000000000&\
sender=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045&\
maxSlippage=0.01"

Ethereum Mainnet (DAI → USDC)

curl "https://api.swapapi.dev/v1/swap/1?\
tokenIn=0x6B175474E89094C44Da98b954EedeAC495271d0F&\
tokenOut=0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48&\
amount=1000000000000000000000&\
sender=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"

Polygon (MATIC → USDC)

curl "https://api.swapapi.dev/v1/swap/137?\
tokenIn=0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE&\
tokenOut=0x2791Bca1f2de4661ED88A30C99A7a9449Aa84174&\
amount=10000000000000000000&\
sender=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"

Executing Swaps

The API gives you an unsigned transaction. Sign it and broadcast:

With Foundry cast

Shortened. The full README is on GitHub.

Nothing above is checked by us. What we check is on the safety report.

Swap API: common questions

Is Swap API MCP server safe?: Mostly: it is graded B (80/100). Read the Swap API safety report
How do I install Swap API?: It runs on your machine. Copy the Claude Code, Cursor, VS Code or Claude Desktop config from the install section.
Does Swap API need an API key?: Not as far as the registry entry and our scan can tell: no credentials are declared or required.
Is Swap API maintained?: The last commit was 215 days ago (2026-04-03). The latest release is v0.1.0.
How does Swap API compare with other MCP servers?: safety score 80/100 (higher than 60% of 48,255 servers); tools 1 (the typical server has 7); tools that change things 0% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.