No pre-send receipt, no safe Base agent launch.
Do not pitch Nishvault as a simulator. Use it as the required proof gate before an EVM agent reaches sendTransaction. The output is a PRE_SEND_PROOF_RECEIPT, not another dashboard tab.
npx --package nishvault-preflight-buy nishvault-guard-tx -- --seller-url https://api.nishvault.com --to 0x2222222222222222222222222222222222222222 --data 0x --value 0x0
Unprotected sendTransaction
agent builds tx -> sendTransaction -> hope
No pre-send receipt, no x402 payment trail, no proof that the agent checked revert risk before broadcast.
Guarded sendTransaction
agent builds tx -> Nishvault guard -> PRE_SEND_PROOF_RECEIPT -> sendTransaction
The builder can share the receipt fields: network, price, tx shape, paid status, settlement tx, and seller wallet-credit expectation.
Need to preview exactly what the receipt looks like? Open /proof-receipt. Want the public status slot? Open /first-real-buyer. Want the no-wallet stop sign first? Open /first-unpaid-402.
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