Tollex Chain Simulate

x402

Tollex Chain Simulate is a paid API for AI agents from api.tollex.org, paid per call via x402, $0.0079/call, status unknown (last checked 2026-10-11).

Simulates an EVM transaction (call or value transfer) against a live or forked chain and returns the execution result without broadcasting

Price / call$0.0079

Seller volume →—

Success—

StatusUnknown

How this service works

Tollex lets software agents buy APIs and tools under rules you set: it finds a capability that fits, checks your policy before anything is signed, pays with x402 in USDC on Base or USDG on Robinhood Chain, reconciles uncertain payments and returns a signed receipt.

Output

Returns the outcome of the simulated EVM transaction, including whether it succeeds or reverts, a revert reason if applicable, gas used, return data, and a signed receipt. No state changes are persisted on-chain.

Example use cases

DeFi swap safety check

“Before I submit this Uniswap swap transaction, can you simulate it first? From 0xMyWallet...1111 to the Uniswap router at 0xRouter...2222, with the swap calldata 0x414bf389...and 0 ETH value — I want to know if it'll succeed or revert.”

NFT mint dry-run

“Simulate this NFT mint call before I actually send it: from 0xMinter...AAAA to the contract 0xNFTContract...BBBB, calldata is 0x6a627842000000...AAAA, and value is 0 wei. Does it revert?”

Safe multisig pre-flight check

“I'm about to execute a transaction from our Safe multisig at 0xSafe...CCCC to a DeFi protocol at 0xProtocol...DDDD with encoded calldata 0x095ea7b3... and value 0 — simulate it first so I can confirm it won't fail before the signers approve.”

Technical details

Endpoint

POSThttps://api.tollex.org/tools/chain_simulate?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need to dry-run an EVM transaction before committing it on-chain — especially when validating complex calldata, checking for reverts, or estimating gas without spending real funds. Prefer it over on-chain execution for pre-flight safety checks in DeFi, NFT minting, or multisig workflows. Compared to node-native eth_call, this adds policy-gated access, x402 micropayment billing, and a signed receipt for auditability.

Side effects

Invalid hex calldata format returns a 400 validation error
Malformed Ethereum address (not 0x + 40 hex chars) causes schema rejection
Target contract does not exist at the specified address — simulation may return empty result
Simulation of deeply recursive or out-of-gas calls may time out
Payment failure via x402 (insufficient USDC balance) blocks the request before simulation runs
Value field exceeding 78 digits is rejected by schema validation

Input

Schema · Request body

Field	Type	Description
to	string
data	string
from	string
value	string

Output

Schema · Response

{
  "type": "json",
  "example": {
    "tool": {
      "id": "chain_simulate",
      "version": "1.0.0",
      "provider": "tollex.robinhood-chain"
    },
    "result": {
      "ok": true,
      "returnData": "0x000000000000000000000000000000000000000000000000000000003b9aca00"
    },
    "evidence": [],
    "untrustedOutput": false
  }
}

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