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ENS Reverse Resolver
x402
ENS Reverse Resolver is a paid API for AI agents from x402.professorsausages.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).
Reverse-resolves an Ethereum address to its primary ENS name, with forward-verification to ensure the name legitimately maps back to that address
Price / call$0.002
Success—
StatusUnknown
How this service works
Reverse-resolve an address to its primary ENS name (forward-verified)
Output
Returns the primary ENS name (e.g. 'vitalik.eth') registered to the given Ethereum address, confirmed via forward verification to ensure the ENS name itself resolves back to the queried address, preventing spoofed reverse records.
Example use cases
Humanize wallet address in dashboard
“I have a list of Ethereum addresses that made transactions on our platform last week. Can you look up the ENS names for each one so I can display friendly names instead of raw 0x addresses in our analytics dashboard?”
Verify ENS name before payment
“Before I send funds to 0x742d35Cc6634C0532925a3b844Bc454e4438f44e, can you check if it has a verified ENS name so I know I'm sending to a legit, identifiable wallet and not some random address?”
Identify whale wallet ENS handle
“I keep seeing this address 0xAb5801a7D398351b8bE11C439e05C5B3259aeC9B show up in large NFT purchases. Can you resolve it to an ENS name so I can figure out who this whale actually is?”
Technical details
Endpoint
GEThttps://x402.professorsausages.com/ens-resolve/address/:addressWhen to prefer
Use this endpoint when you need to humanize an Ethereum wallet address by finding its associated ENS name, especially when you require forward-verification to ensure the reverse record is authentic and not spoofed. Prefer this over manual on-chain lookups when you want a simple REST call with guaranteed forward-verification included.
Side effects
- Address has no primary ENS name set — returns null or 404
- Address is not a valid Ethereum address format — returns 400 validation error
- ENS name exists but forward verification fails — name is returned as unverified or rejected
- ENS resolver service unavailable — returns 503
- Payment failure — x402 payment not processed, returns 402
Tags
x402
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