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Synapse API — Humanity Token Balances
x402
Synapse API — Humanity 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 2026-10-29).
Fetches token balances for a given wallet address across specified ERC-20 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 a list of token balances associated with the specified owner wallet address for each provided contract address, including amounts held per token contract.
Example use cases
Portfolio token balance snapshot
“Check the token balances for wallet 0x1234abcd...5678 for USDC at 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 and USDT at 0xdAC17F958D2ee523a2206206994597C13D831ec7.”
DeFi dashboard balance check
“Pull the current balances for wallet 0xDeFi...9999 across these three token contracts: 0xTokenA, 0xTokenB, and 0xTokenC — I want to see how much of each token they're holding.”
Wallet audit for specific tokens
“Look up how many governance tokens this wallet 0xDao...abcd holds — here are the contract addresses for the tokens I care about: 0xGov1 and 0xGov2.”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/humanity/token/balances?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to look up ERC-20 token balances for a specific wallet address against one or more contract addresses, particularly in automated DeFi portfolio tracking, wallet auditing, or token distribution verification workflows. It is pay-per-call via x402/USDC micropayment, making it cost-effective for on-demand lookups rather than bulk historical queries.
Side effects
- Invalid or malformed wallet address returns an error or empty result
- Non-existent contract address may return zero balance or an error
- Network unavailability on the target blockchain results in a timeout or 503
- Missing required 'owner' field causes a 400 bad request
- Empty contractAddresses array may return an empty result set
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| owner | string | |
| contractAddresses | array |
Tags
x402
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