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Synapse API — Plasma Token Balances
x402
Synapse API — Plasma 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).
Fetches ERC-20/token balances for a given wallet owner address across specified contract addresses on 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 token balance data for the specified owner address across each provided contract address, including the balance amounts held by that wallet for each token contract queried.
Example use cases
DeFi portfolio snapshot
“Can you pull the token balances for my wallet 0x1234abcd... across these contract addresses: 0xUSDC, 0xDAI, and 0xWETH? I want to see how much of each I'm holding.”
Smart contract airdrop eligibility check
“Check if wallet 0xdeadbeef... holds any tokens from these contract addresses — 0xToken1 and 0xToken2 — so I can verify if they qualify for the airdrop.”
On-chain treasury balance monitoring
“Fetch the current token balances for our DAO treasury wallet 0xTreasury123 across our governance token 0xGOV and stablecoin 0xUSDC contracts.”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/plasma/token/balancesWhen to prefer
Use this endpoint when you need to quickly look up on-chain token balances for one or more ERC-20 token contracts for a specific wallet address, especially when paying per-call via x402 micropayments without needing a persistent API key subscription.
Side effects
- Invalid or malformed owner address returns an error
- Unknown or invalid contract address may return zero balance or error
- Network/RPC errors for specific chains may cause lookup failure
- Missing required owner field returns validation error
- Empty contractAddresses array may return empty results
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| owner | string | |
| contractAddresses | array |
Tags
x402
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