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OneSource ERC-1155 Token Balance Lookup
x402
OneSource ERC-1155 Token Balance Lookup is a paid API for AI agents from api.onesource.io, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-13).
Returns the ERC-1155 NFT token balance for a given wallet address, contract, and token ID on Ethereum mainnet or Sepolia testnet
Price / call$0.003
Success—
StatusUnknown
How this service works
ERC1155 token balance via balanceOf (eth_call) - how many copies of a token_id a wallet holds
Output
A JSON object containing the queried account address, contract address, token ID, and the integer balance (as a string) representing how many of that ERC-1155 token the account holds.
Example use cases
Example prompt
“How many ERC-1155 tokens does wallet 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 hold for token ID 1 on the contract 0xdAC17F958D2ee523a2206206994597C13D831ec7 on Ethereum mainnet?”
Technical details
Endpoint
GEThttps://api.onesource.io/api/chain/erc1155-balanceWhen to prefer
Use this endpoint when you need to check the exact quantity of a specific ERC-1155 (multi-token standard) token held by a wallet — especially for NFT games, semi-fungible tokens, or multi-edition collectibles. Prefer this over ERC-721 balance endpoints when dealing with tokens that can have quantity > 1. Choose this when no API key is available and you can pay per call with USDC on Base.
Side effects
- Invalid wallet address format returns an error (must be 0x-prefixed 40-char hex)
- Invalid contract address format returns an error
- Non-existent token ID may return balance of 0
- Network not found if unsupported network specified
- Payment failure (402) if USDC payment not provided or insufficient
- Rate limiting if too many unauthenticated requests made
Input
{
"account": "0x1234567890123456789012345678901234567890",
"network": "sepolia",
"contract": "0x0987654321098765432109876543210987654321",
"token_id": "1"
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
{
"data": {
"account": "0x1234567890123456789012345678901234567890",
"balance": "0",
"token_id": "1",
"contract_address": "0x0987654321098765432109876543210987654321"
},
"meta": {
"endpoint": "/api/chain/erc1155-balance",
"request_id": "007b7e62b1eac6ef"
}
}Schema · Response
{
"type": "json",
"example": {
"data": {
"account": "0xd8da6bf26964af9d7eed9e03e53415d37aa96045",
"balance": "42",
"token_id": "1",
"contract_address": "0xdac17f958d2ee523a2206206994597c13d831ec7"
},
"meta": {
"endpoint": "/api/chain/erc1155-balance",
"cost_usdc": "0.001",
"request_id": "00000000abcdef01",
"payment_chain": "base",
"payment_token": "USDC"
}
}
}Tags
x402
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