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Synapse API — Sonic Token Balances
x402
Synapse API — Sonic 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).
Fetches token balances for a given wallet address on the Sonic blockchain network, optionally filtered by specific token 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 for the specified wallet address on the Sonic blockchain, showing each token's contract address and corresponding balance amount, optionally scoped to the provided contract addresses.
Example use cases
DeFi portfolio snapshot on Sonic
“What tokens does wallet 0xAbc123... currently hold on the Sonic network? Show me all their token balances.”
Verify specific token holding
“Does wallet 0xDeFi456... hold any of the token at contract 0xToken789... on Sonic? I need to check their balance before approving a transfer.”
Multi-token airdrop eligibility check
“Check the Sonic token balances for wallet 0xUser999... across these three contract addresses — 0xContractA..., 0xContractB..., and 0xContractC... — so I can verify airdrop eligibility.”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/sonic/token/balancesWhen to prefer
Use this endpoint when you need to query token balances specifically on the Sonic blockchain network. Prefer this over generic multi-chain balance APIs when targeting Sonic specifically, or when you need pay-per-call pricing without subscription commitments via the x402 protocol.
Side effects
- Invalid wallet address format returns an error
- Non-existent or zero-balance wallet returns empty results
- Invalid contract address in the array causes a lookup failure
- Sonic network outage or RPC unavailability causes timeout
- Wallet with no token activity returns empty balance list
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| owner | string | |
| contractAddresses | array |
Tags
x402
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