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Synapse API — Abstract Token Balances
x402
Synapse API — Abstract Token Balances is a paid API for AI agents from synapse-api-brown.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).
Retrieves token balances for a given wallet address across specified ERC-20 or native token contract addresses on Abstract (or supported blockchain networks)
Price / call$0.01
Success—
StatusUnknown
How this service works
High-speed API suite for AI processing, web scraping, and smart data utilities across 57+ blockchain networks. Pay-per-call via x402.
Output
Returns a structured list of token balances for the specified wallet owner address, keyed by each provided contract address, including balance amounts and potentially token metadata such as symbol and decimals.
Example use cases
DeFi portfolio snapshot for wallet
“Pull the token balances for wallet 0xAbC123...def across these contract addresses: 0xUSDC..., 0xWETH..., and 0xDAI... — I want to see exactly how much of each token they're holding.”
Verify token eligibility for airdrop
“Check whether wallet 0xDeFi456...abc holds any balance of the token at contract 0xNewToken... — I need to confirm eligibility before the airdrop snapshot.”
Monitor whale wallet holdings
“Look up the current token balances for 0xWhale789...xyz for contracts 0xPEPE... and 0xSHIB... so I can track what that wallet is accumulating.”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/abstract/token/balancesWhen to prefer
Choose this endpoint when you need to look up on-chain token balances for a specific wallet across one or more ERC-20 or native token contracts, especially when operating in an agent pipeline that supports x402 pay-per-call micropayments. Prefer this over general blockchain explorers when you need programmatic, API-level access to balance data without scraping.
Side effects
- Invalid or malformed owner address returns an error or empty result
- Unsupported contract address returns null or zero balance
- Rate limiting or payment failure (x402) returns a 402 Payment Required response
- Network timeout if the underlying blockchain node is slow
- Empty contractAddresses array may return no results or an error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| owner | string | |
| contractAddresses | array |
Tags
x402
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