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ENS Resolver
x402
ENS Resolver is a paid API for AI agents from ens-resolver.underscoredone.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).
Resolves an ENS name to its Ethereum address, or reverse-resolves an Ethereum address to its ENS name.
Price / call$0.01
Success—
StatusUnknown
How this service works
Look up an ENS name or an Ethereum address and get back the matching one, automatically figuring out which direction you need.
Output
Returns the resolved counterpart: if given an ENS name like vitalik.eth, returns the corresponding Ethereum address; if given a 0x Ethereum address, returns the matching ENS name. Response is a JSON object with API version metadata.
Example use cases
Example prompt
“What Ethereum address does vitalik.eth resolve to? Also, can you do the reverse and look up the ENS name for 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045?”
Technical details
Endpoint
POSThttps://ens-resolver.underscoredone.com/resolveWhen to prefer
Use this endpoint when an AI agent needs to resolve ENS names to Ethereum addresses or perform reverse resolution in a lightweight, pay-per-call manner without managing RPC infrastructure. Ideal for agents that occasionally need ENS lookups without a persistent Ethereum node connection.
Side effects
- ENS name does not exist or has no resolver set — returns error or null address
- Ethereum address has no reverse ENS record registered — returns empty or null name
- Malformed input (invalid ENS name or non-0x address) — returns validation error
- ENS resolution temporarily unavailable due to Ethereum node issues — returns 5xx error
- Payment not processed correctly via x402 protocol — returns 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| query | string | An ENS name like vitalik.eth, or an Ethereum address starting with 0x. The service automatically figures out which one you gave it. |
Output
Schema · Response
{
"type": "json",
"example": {
"api_version": "1.0.0"
}
}Tags
x402
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