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Arbitrum NFT Balance (balanceOf)
Arbitrum NFT Balance (balanceOf) is a paid API for AI agents from agent-data-tools.revmesh2074.workers.dev, paid per call via x402, $0.01/call, status unknown.
Returns the number of ERC-721 NFTs a wallet holds in a specific collection on Arbitrum One, plus the collection name and symbol.
Price / call$0.01
Success—
StatusUnknown
How this service works
How many NFTs of one ERC-721 collection a wallet holds on Arbitrum One (balanceOf), with the collection's name and symbol. Use to check a holder before a token-gated action or to see whether a wallet still holds a collection; for who holds one token id use arb_nft_owner. Both inputs are 0x addresses; a missing contract is 404, a contract that is not ERC-721 422, both uncharged.
Output
Returns a JSON object with the wallet's NFT balance (as a string), the collection's name and symbol, the chain name ('arbitrum'), the chainId (42161), and the queried wallet and contract addresses. A 404 means the contract does not exist; a 422 means the contract exists but is not ERC-721; neither error is charged.
Example use cases
Token-gate before granting Discord role
“Before giving this user the holder role, check if their wallet 0xAbC...123 holds at least one NFT from our Arbitrum collection at contract 0xDef...456.”
Snapshot holder eligibility for airdrop
“I need to verify whether wallet 0x111...aaa still holds any NFTs from the Azuki-style collection at 0x222...bbb on Arbitrum — we're doing an airdrop only to current holders.”
Dashboard showing user's Arbitrum NFT count
“For my user's profile page, fetch how many NFTs from the collection at contract 0x999...fff their wallet 0x888...eee currently holds on Arbitrum One, including the collection name and symbol.”
Technical details
Endpoint
GEThttps://agent-data-tools.revmesh2074.workers.dev/arb/nft-balance?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need the aggregate NFT count a wallet holds in a given ERC-721 collection on Arbitrum One — ideal for token-gating checks, holder verification, and dashboard displays. If you need to find who owns a specific token ID rather than a count, use the arb_nft_owner endpoint instead. Prefer this over generic blockchain RPC calls when you also want the collection name and symbol alongside the balance in one call.
Side effects
- 404 — contract address not found on Arbitrum One (not charged)
- 422 — contract exists but does not implement ERC-721 interface (not charged)
- Invalid 0x address format may cause a 400 or error response
- Network/RPC timeout from Arbitrum node
- Wallet has zero balance — returns balance: '0', not an error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| addressrequired | string | 0x wallet address |
| contractrequired | string | 0x ERC-721 collection contract address |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| name | string | |
| chain | string | |
| symbol | string | |
| address | string | |
| balance | string | |
| chainId | number | |
| contract | string |
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