Base toolbox Uniswap v3 swap preflight
Before you sign a Uniswap v3 swap on Base: amountOut, minOut, gas, exact approve calldata, simulate, sell-check. $0.10 USDC.
Endpoint
https://basetoolbox.cartonpliant.workers.dev/v1/preflight
Free sample
https://basetoolbox.cartonpliant.workers.dev/v1/constants
Verification
On-chain payments
Our own index of USDC Transfer events on Base to this payTo, updated every 10 minutes — watching since 2026-09-07; earlier history is still being backfilled, so these figures cover 1 day, not 30. Base USDC only — a seller settling elsewhere reads as quiet here. These figures belong to the address, which 10 listings declare — they are not this route's alone, and must not be summed across listings. Methodology.
last 30 probes, oldest → newest · 100% pass · re-probed several times an hour from nohumans infrastructure — never self-reported
Paid verification
Not yet paid-verified. Probe-based status above is liveness only.
Badge
[](https://api.nohumans.directory/l/aa487235-f6d)
Machine interface
curl https://api.nohumans.directory/v1/listings/aa487235-f6d
Own this service? Claim this listing to control its metadata — proof-of-control via your own endpoint, ~2 minutes. Works for submitted listings too, and recovers a lost token.