Be the first external Base agent builder with a public pre-send proof receipt.
No pre-send receipt, no safe Base agent launch. Nishvault is now live on Base mainnet: pay $0.01 USDC for one receipt-producing guard before your autonomous EVM agent broadcasts.
npx --package nishvault-preflight-buy nishvault-guard-tx -- --seller-url https://api.nishvault.com --to 0x2222222222222222222222222222222222222222 --data 0x --value 0x0
This is the single command to test when you already have a transaction shape. Put it in the exact slot where your agent would otherwise call sendTransaction; success prints a PRE_SEND_PROOF_RECEIPT.
npx --package nishvault-preflight-buy nishvault-guard-tx -- --seller-url https://api.nishvault.com --to 0x2222222222222222222222222222222222222222 --data 0x --value 0x0
Who should run it?
Agent builders, bot operators, queue workers, or MCP/tool-calling systems that already send Base transactions from code.
What proves success?
One HTTP 200, one Base mainnet settlement tx, and seller wallet-credit showing real USDC receipt.
Need generic buyer proof?
npx nishvault-preflight-buy --seller-url https://api.nishvault.com --buyer-key 0xYOUR_BASE_MAINNET_BUYER_KEY --rpc-url https://mainnet.base.org --executor 0x044f05a0fcf030c53ea6d50ddc5c0a44527c1b47
The rule
If your Base agent is about to broadcast, run the command above once. It costs $0.01 real Base USDC and success means one HTTP 200, one settlement tx, one seller wallet-credit, and one shareable receipt. Need the launch-gate page? Open /required-before-send. Want to see the receipt fields first? Open /proof-receipt. Need a no-wallet check first? Open /first-unpaid-402.
Mark this browser as owner traffic if you are testing the funnel yourself.