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Zerion API - Wallet Transaction Simulation
x402
Zerion API - Wallet Transaction Simulation is a paid API for AI agents from api.zerion.io, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-01).
Simulates a blockchain transaction for a given wallet and chain, returning predicted outcomes before execution
Price / call$0.01
Success—
StatusUnknown
How this service works
Interpreted wallet data for more than 40 chains and Solana: portfolios, DeFi positions, PnL, transactions and NFTs. REST for apps, x402 pay-per-call for agents.
Output
Returns a JSON object with a data field containing a resource id, resource type, and attributes describing the predicted outcome of the simulated transaction — including expected state changes, token flows, and success/failure indicators — along with a self-referencing links object.
Example use cases
Pre-flight DeFi swap check
“I'm about to swap 1 ETH for USDC on Uniswap using wallet 0xAbC...123 on Ethereum (chain ID 1) — can you simulate that transaction first so I can see if it'll go through and what I'll actually receive?”
Safe NFT purchase preview
“Before I buy this NFT, simulate the purchase transaction for my wallet 0xDef...456 on Polygon (chain ID 137) so I can confirm the expected changes to my holdings and whether the transaction will succeed.”
Approval transaction validation
“I need to approve a DeFi protocol to spend my USDC — can you run a simulation of that approval transaction for wallet 0x789...abc on Arbitrum (chain ID 42161) to make sure it looks safe before I sign it?”
Technical details
Endpoint
POSThttps://api.zerion.io/v1/wallets/simulation/transaction?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent or app needs to preview the outcome of a blockchain transaction before committing it on-chain — especially for DeFi swaps, NFT purchases, token approvals, or any high-stakes transaction where verifying expected results and safety is critical. Prefer this over live execution when the goal is risk assessment or user confirmation flows.
Side effects
- Invalid wallet address format returns 400 bad request
- Unsupported chain ID returns 422 or error response
- Malformed transaction object causes simulation failure
- Network congestion or RPC timeout may cause 503
- Insufficient input fields (missing address or transaction) returns 400
- Transaction simulation itself may return a reverted/failed state in attributes
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| address | string | Wallet address |
| chain_id | string | Chain ID |
| transaction | object | Transaction to simulate |
Output
Schema · Response
{
"type": "json",
"example": {
"data": {
"id": "<resource id>",
"type": "<resource type>",
"attributes": {}
},
"links": {
"self": "https://api.zerion.io/v1/..."
}
}
}Tags
x402
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