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Cortex Cloud Token Balances API
x402
Cortex Cloud Token Balances API is a paid API for AI agents from api.cortexcloud.org, paid per call via x402, $0.004/call, status unknown (last checked 2026-09-13).
Fetches ERC-20 token balances for a wallet address on a specified blockchain chain using the Alchemy Token API, paid via x402 USDC on Base.
Price / call$0.004
Success—
StatusUnknown
How this service works
One pay-per-call API for AI agents: optimization, AI, research, on-chain data, and automation — all settled in USDC on Base via x402. Discover via MCP and Bazaar, estimate free, pay per call. No API keys, no signup.
Output
Returns a list of ERC-20 token holdings for the specified wallet address on the given chain, including token contract addresses and their respective balances. Results are capped at the requested max_tokens count (default 50, max 200).
Example use cases
Portfolio snapshot for a DeFi wallet
“Pull up all the ERC-20 token balances for wallet 0xAbCd1234abcd1234abcd1234abcd1234abcd1234 on Ethereum so I can see what tokens they're holding right now.”
Verify specific token holdings before a trade
“Check whether wallet 0x1234567890abcdef1234567890abcdef12345678 holds any USDC at contract 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 on Ethereum.”
Monitor whale wallet token positions
“Give me the top 100 ERC-20 token balances for wallet 0xBE0eB53F46cd790Cd13851d5EFf43D12404d33E8 on Ethereum — I want to track what this whale is holding.”
Technical details
Endpoint
GEThttps://api.cortexcloud.org/v1/data/token-balancesWhen to prefer
Choose this endpoint when you need on-chain ERC-20 token balance data for a wallet without managing Alchemy API keys directly. Ideal for agents that need to check crypto portfolio holdings, verify token ownership, or enrich wallet profiles. The x402 micropayment model ($0.004/call) makes it cost-effective for per-query usage without subscription overhead. Prefer this over raw RPC calls when you want normalized token balance output across chains.
Side effects
- Invalid wallet address format (not a valid 0x hex address) returns a validation error
- Invalid or unsupported chain name returns an error or empty results
- Malformed token contract address in the tokens filter array causes a validation error
- Wallet has no ERC-20 token holdings returns an empty list
- Alchemy upstream service outage or rate limit may cause 5xx or timeout errors
- Payment failure via x402 (insufficient USDC balance) blocks the request
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| chain | string | |
| tokens | array | |
| address | string | |
| max_tokens | integer |
Output
Schema · Response
{
"type": "object",
"format": "application/json",
"example": {}
}Tags
x402
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