Approval risk
Highlights unlimited token approvals and collection-wide NFT permissions.
Know what a Base transaction will do before it is signed.
Machine Preflight gives wallets and AI agents a clear, caller-specific risk report in one request. It helps catch dangerous approvals, privileged calls, likely reverts and suspicious targets before funds are put at risk.
0.02 USDCper successful report
No accountstandard x402 payment
Read-onlynever signs or broadcasts
Base analysispay on Base or Solana
A small check before a costly mistake
Execution problems
Runs a read-only simulation and reports likely reverts before signing.
Unexpected authority
Recognizes sensitive administrative actions such as upgrades, pauses and ownership changes.
Wrong destination
Checks the target contract code and warns when calldata is sent to an address without code.
Built for products that move onchain
Add a second opinion before the final confirmation screen.
Apply a machine-readable safety policy before an autonomous signature.
Check the exact transaction your product is about to request.
How it works
Build the final unsigned Base transaction, including the real sender address.
Send it to the API. An x402-compatible client handles the micro-payment.
Use the risk level, findings and simulation result before asking for a signature.
One endpoint to integrate
POST https://preflight.natio.re/v1/preflight/transaction
Content-Type: application/json
{"chainId":8453,"from":"0x2222222222222222222222222222222222222222","to":"0x4200000000000000000000000000000000000006","data":"0x","valueWei":"0"}from must be the address that will send the transaction. This keeps permission checks, balances and gas estimates relevant to the real caller.
Pay 0.02 USDC on Base or Solana for each successful report. An unpaid request returns the standard x402 v2 payment instructions, so compatible clients can pay and retry automatically.
Suggested policy: stop on a critical or high finding, a reverted simulation, or an unavailable analysis. A low result is useful evidence, not a guarantee.
Documentation for every reader
- OpenAPI 3.1 — exact schemas and payment metadata.
- llms.txt — concise operating instructions for AI agents.
- Agent skill — reusable decision workflow before signing.
- Service health · dependency readiness.
Clear limits
The report is a technical safety signal, not financial advice or a complete smart-contract audit. Onchain state can change between the report and the final transaction. Machine Preflight never requests a private key, signs a transaction, broadcasts it or takes custody of funds.