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ENS Reverse Lookup – Get Primary ENS Name for Ethereum Address
x402
ENS Reverse Lookup – Get Primary ENS Name for Ethereum Address is a paid API for AI agents from api.api-agent-ia.ch, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-26).
Returns the primary ENS (Ethereum Name Service) name associated with a given Ethereum address via reverse resolution
Price / call$0.002
Success—
StatusUnknown
How this service works
Does this wallet have a readable name? Returns the primary ENS name of an address on Ethereum mainnet, or null if it has none ($0.002 per call).
Output
A JSON object containing the primary ENS name (e.g. 'vitalik.eth'), the network ('ethereum'), and the resolved Ethereum address (0x…). Returns null or an error if no ENS name is registered for the address.
Example use cases
Identify wallet owner from address
“I have the Ethereum address 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 — can you tell me if it has a primary ENS name registered to it?”
Display human-readable name in dApp
“We're building a wallet UI — look up the ENS name for 0xAb5801a7D398351b8bE11C439e05C5B3259aeC9B so we can show a friendly name instead of the raw address.”
Verify ENS ownership before payment
“Before I send funds, can you check if the address 0x1234567890abcdef1234567890abcdef12345678 has a primary ENS name linked so I can confirm I've got the right person?”
Technical details
Endpoint
GEThttps://api.api-agent-ia.ch/nom-ens?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to reverse-resolve an Ethereum address to its human-readable ENS name (reverse lookup). Choose this over a forward ENS resolver when your input is a 0x address and you want to find the name, not the other way around. Ideal for enriching wallet data, displaying friendly identities in UIs, or verifying ENS ownership before a transaction.
Side effects
- Address has no primary ENS name set — returns empty or null name field
- Invalid Ethereum address format supplied — likely returns a 400 or error response
- ENS resolution temporarily unavailable due to upstream node issues
- Rate limiting or payment failure if x402 payment is not processed correctly
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"name": "vitalik.eth",
"reseau": "ethereum",
"adresse": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"
}
}Tags
x402
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