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Multicall3 Batch eth_call
x402
Multicall3 Batch eth_call is a paid API for AI agents from x402-audit.tatschluizguilherme.workers.dev, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-16).
Executes up to 20 read-only Ethereum calls in a single batched request via the Multicall3 contract on Base, Optimism, or Ethereum Mainnet, returning per-call success flags, return data, block number, and gas estimate
Price / call$0.1
Success—
StatusUnknown
How this service works
Pay-per-call on-chain API for AI agents and developers: wallet audits, token safety audits (honeypot detection), live gas prices, token prices, transaction receipts, balances, ENS resolution, block data, ERC-20 allowances, transaction simulation, swap quotes and multicall batches — all computed on-chain via public RPCs (no external market API). Pay per request in USDC on Base via the x402 exact scheme (EIP-3009 transferWithAuthorization). No API key, no signup, no subscription.
Output
An array of per-call results each containing a success boolean and raw returnData (hex), plus the blockNumber at which the batch was executed and an overall gas estimate for the batch. A call that reverts returns success:false without causing the entire batch to fail.
Example use cases
DeFi portfolio snapshot in one shot
“Check all 6 token balances and 3 Uniswap allowances for wallet 0xAbCd1234 on Base in a single multicall — return each result with a success flag so I know if any call failed, and include the block number.”
Multi-wallet balance audit
“Batch-fetch the native ETH and USDC balances of these 10 wallet addresses on Optimism in one request using Multicall3 — I want per-address success flags and the gas estimate for the batch.”
DeFi protocol state aggregation
“Run a multicall on Ethereum Mainnet to read the reserves, totalSupply, and fee from these 4 Uniswap V2 pair contracts at the same block — give me the returnData and success flag for each call.”
Technical details
Endpoint
GEThttps://x402-audit.tatschluizguilherme.workers.dev/multicallWhen to prefer
Choose this endpoint when you need to aggregate multiple read-only on-chain data points (balances, allowances, contract state) in a single round trip, avoiding multiple sequential RPC calls. Ideal for DeFi dashboards, portfolio trackers, or any agent workflow requiring 2–20 contract reads at the same block. Prefer over individual balance/allowance endpoints when fetching 3 or more values from the same or different contracts on Base, Optimism, or Ethereum Mainnet.
Side effects
- More than 20 calls submitted — batch limit exceeded
- Invalid calldata encoding causes individual call to revert (returned as success:false)
- Unsupported chain ID — only Base, Optimism, Ethereum Mainnet accepted
- Malformed request body returns 400 error
- Network congestion or RPC timeout causes full batch failure
- Contract address does not exist on the specified chain — success:false returned
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| calls | string |
Output
Schema · Response
{
"type": "json",
"example": {
"calls": [
{
"to": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
"data": "0x70a082310000000000000000000000008e8d53a67b59e6f2a28e0d6d52012a2b0e3e1886",
"success": true,
"returnData": "0x0000000000000000000000000000000000000000000000000000000000000000"
}
],
"network": "base",
"callCount": 2,
"multicall3": "0xcA11bde05977b3631167028862bE2a173976CA11",
"blockNumber": 24400123,
"gasEstimate": 61458,
"requestedAt": "2026-08-05T02:20:00.000Z"
}
}Tags
x402
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