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ERC20/ERC721 Total Supply Lookup
x402
ERC20/ERC721 Total Supply Lookup is a paid API for AI agents from twin.unykorn.org, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-01).
Returns the total token supply for a given ERC20 or ERC721 contract address on one of ten supported EVM chains
Price / call$0.003
Success—
StatusUnknown
How this service works
Total supply of an ERC20 or ERC721 contract — Genesis402 / UnyKorn Operator Network
Output
Returns a JSON object containing: a boolean ok status, the supply type (erc20-supply), and a receipt object with the transaction hash, USD amount charged, receipt ID, and ISO8601 timestamp of when the data was generated.
Example use cases
NFT collection size verification
“How many NFTs have been minted in total for the contract 0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D on Ethereum?”
DeFi token supply monitoring
“What's the total supply of the USDC token at 0x2791Bca1f2de4661ED88A30C99A7a9449Aa84174 on Polygon? I want to track it over time.”
New token launch audit
“I need to verify the total supply of a newly launched token at contract 0x1234567890abcdef1234567890abcdef12345678 on Base — can you pull the on-chain total supply?”
Technical details
Endpoint
POSThttps://twin.unykorn.org/erc20-supply?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, pay-per-call lookup of a token's total supply across any of ten major EVM chains without running your own RPC infrastructure. Ideal for agents that need on-chain token metadata without a long-term API subscription. The x402 micropayment model ($0.003/call) makes it cost-effective for low-frequency or one-off queries.
Side effects
- Invalid contract address format (not a valid 0x hex address) returns a validation error
- Unsupported chain name outside the allowed enum returns an error
- Contract address does not implement ERC20/ERC721 supply interface returns null or error
- Payment failure via x402 protocol results in 402 response and no data
- Network timeout or RPC node unavailability on the target chain
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| params | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"type": "erc20-supply",
"receipt": {
"tx_hash": "0x<64hex>",
"amount_usd": 0.003,
"receipt_id": "g402-<16hex>"
},
"generated_at": "<iso8601>"
}
}Tags
x402
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