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OneSource Token Total Supply
x402
OneSource Token Total Supply is a paid API for AI agents from skills.onesource.io, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-13).
Returns the total supply of an ERC20 or ERC721 token contract by calling totalSupply on-chain via eth_call
Price / call$0.003
Success—
StatusUnknown
How this service works
Total supply of an ERC20 or ERC721 token contract via totalSupply (eth_call)
Output
Returns a JSON object with the token's name, symbol, decimals, total supply (as a raw integer string), whether it's an ERC721, and the contract address. For example, USDC on Ethereum returns name='USD Coin', symbol='USDC', decimals=6, total_supply='54863922761251119', is_erc721=false.
Example use cases
Check NFT collection minting progress
“Can you look up how many NFTs have actually been minted for the Pudgy Penguins collection? I need the total supply from the smart contract.”
Compare token supplies across networks
“I'm researching USDT — can you grab the total supply for the USDT contract on both Ethereum and Base so I can compare the distributions?”
Validate token metadata before trade
“Before I swap into this token, pull up the total supply and decimals for the contract at 0x6B175474E89094C44Da98b954EedeAC495271d0F on Ethereum to make sure it's legit.”
Technical details
Endpoint
GEThttps://skills.onesource.io/api/chain/total-supplyWhen to prefer
Use this endpoint when you need on-chain totalSupply data for any ERC20 or ERC721 token on supported networks (Ethereum, Base, Avalanche, Sepolia, MegaETH). It also returns human-readable token metadata (name, symbol, decimals) in one call, making it ideal for DeFi analytics, NFT supply checks, or token research without running your own RPC node.
Side effects
- Invalid contract address format returns a 400 error
- Contract address that doesn't implement totalSupply returns an error or null supply
- Unsupported network value causes validation failure
- Network RPC unavailability causes a timeout or 503
- Non-token contract address (e.g. wallet or proxy with no ERC20 interface) may return unexpected results
Input
{
"network": "ethereum",
"contract": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48"
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| network | string | |
| contract | string |
Output
{
"data": {
"name": "USD Coin",
"symbol": "USDC",
"decimals": 6,
"is_erc721": false,
"total_supply": "52402765504217914",
"contract_address": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48"
},
"meta": {
"endpoint": "/api/chain/total-supply",
"request_id": "7685fd0756c95991"
}
}Schema · Response
| Field | Type | Description |
|---|---|---|
| datarequired | object | |
| metarequired | object |
Tags
x402
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