Summary
This server connects Claude to the Ethereum Name Service, letting you resolve .eth domains to wallet addresses and do reverse lookups from addresses back to names. It runs on the x402 micropayment protocol, so you'll need to handle per-request pricing. Useful when you're building crypto tools or agents that need to translate human-readable ENS names into addresses for transactions or lookups. The implementation is TypeScript based and accessible via SSE transport at a hosted endpoint. Reach for this when you need ENS resolution without spinning up your own Ethereum node or managing API keys for third-party services.
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Public tool metadata for what this MCP can expose to an agent.
1 tools
crypto_resolve_ensUse this when you need to resolve an ENS name to an Ethereum address, or reverse-resolve an address to its ENS name. Returns resolution data in JSON. 1. address: resolved Ethereum address (0x...) 2.2 params
Use this when you need to resolve an ENS name to an Ethereum address, or reverse-resolve an address to its ENS name. Returns resolution data in JSON. 1. address: resolved Ethereum address (0x...) 2.
Parameters* required
addressstringEthereum address for reverse resolution (e.g. 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045)
namestringENS name to resolve (e.g. vitalik.eth)
ENS Resolver API
Resolve ENS names to ETH addresses and reverse -- avatar URLs included. Identity layer for agents. Pay-per-call via x402 (USDC on Base L2) -- no API key, no signup, no rate-limit wall.
Part of the klymax402 marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.
Quickstart -- MCP
Add to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):
{
"mcpServers": {
"ens-resolver": {
"url": "https://ens-resolver.api.klymax402.com/mcp"
}
}
}
Quickstart -- HTTP (x402)
curl -X POST "https://ens-resolver.api.klymax402.com/api/resolve" \
-H "Content-Type: application/json" \
-d '{}'
# -> 402 Payment Required, with an x402 payment challenge in the response body
Any x402-aware client (@x402/fetch, x402-agent-tools, ATXP) handles the 402 -> sign -> retry cycle automatically.
Tools
| Tool | Method | Path | Price | Description |
|---|---|---|---|---|
crypto_resolve_ens | POST | /api/resolve | $0.005 | Resolve ENS name to Ethereum address or reverse-resolve address to ENS name |
crypto_resolve_ens
Use this when you need to resolve an ENS name to an Ethereum address, or reverse-resolve an address to its ENS name. Returns resolution data in JSON.
Parameters
| Name | Type | Required | Description |
|---|---|---|---|
name | string | no | ENS name to resolve (e.g. vitalik.eth) |
address | string | no | Ethereum address for reverse resolution (e.g. 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045) |
Returns
address-- resolved Ethereum address (0x...)ensName-- ENS name (e.g. vitalik.eth)avatar-- avatar URL associated with the ENS name (if set)resolvedDirection-- "forward" (name to address) or "reverse" (address to name)
Example response:
{"address":"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045","ensName":"vitalik.eth","avatar":"https://...","resolvedDirection":"forward"}
When to use: sending funds to an ENS name to verify the correct address. Essential for identity resolution and human-readable wallet lookup.
Not for: wallet balances (use wallet_get_portfolio), token safety (use token_check_safety), NFT metadata (use crypto_get_nft_metadata).
Example agent prompts
- "Resolve an ENS name to an Ethereum address, or reverse-resolve an address to its ENS name"
Payment
- Protocol: x402 -- HTTP-native pay-per-call, no signup, no API key
- Network: Base L2 (
eip155:8453) - Asset: USDC
- Facilitator: Coinbase CDP (primary), PayAI (fallback)
- Also reachable via ATXP (OAuth-wrapped x402, RFC 9728 protected-resource metadata)
Part of klymax402
100 x402 micropayment APIs for AI agents -- one wallet, USDC on Base, zero signup.
- Catalog: https://klymax402.com/llms.txt
- Full API reference: https://klymax402.com/llms-full.txt
- Live stats: https://klymax402.com/stats
License
MIT
Featured
Plug Mailtrap into your AI workflow and let it handle the email.
Connect Mailtrap MCP →Agent, run crypto. Access onchain data & trade routes via 1inch.
Install now →Make coding agent sessions - Searchable, Shareable, Vendor-neutral & Scored.
Try For Free →Your agent targets a perfect 10 Code Health score. Deterministic. Every commit.
Try For Free →Integrate web data into your AI product. One API to scrape website & brand data.
Get API Key Now →belt cli automatically finds the best tools and skills for your agent. image, video, music, tts...
one prompt install →