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Synapse API — opBNB Token Balances
x402
Synapse API — opBNB 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 2026-09-13).
Retrieves token balances for a given wallet address on the opBNB blockchain network, optionally filtered by specific contract addresses.
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 list of token balances associated with the given wallet address on the opBNB network, including token contract addresses and their corresponding balance amounts. If specific contract addresses are provided, results are filtered to those tokens only.
Example use cases
DeFi portfolio balance check
“Show me all token balances for my wallet 0x1234abcd...5678 on the opBNB network so I can see my current holdings.”
Specific token holding verification
“Check whether wallet 0xDEAD...BEEF holds any tokens for these contracts on opBNB: 0xContractA... and 0xContractB....”
Automated wallet monitoring
“Every hour, pull the token balances for wallet 0xMonitor...0001 on opBNB and alert me if anything changes significantly.”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/opbnb/token/balancesWhen to prefer
Use this endpoint when you need to query token balances specifically on the opBNB (Optimistic BNB) Layer 2 network. Prefer this over generic multi-chain balance endpoints when your use case is opBNB-specific and you want pay-per-call pricing without subscription overhead.
Side effects
- Invalid or malformed wallet address returns an error or empty result
- Contract address array contains invalid addresses causing partial or failed lookups
- opBNB network outage or RPC unavailability causing timeout
- Wallet address with no token holdings returns empty balance list
- Rate limiting or payment failure via x402 protocol returning 402 status
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| owner | string | |
| contractAddresses | array |
Tags
x402
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