V4 Hooks

Uniswap v4 hook intelligence: decode what a hook contract is allowed to do before routing through its pools. Independent service, not affiliated with Uniswap Labs. Machine-payable per request.

Robinhood Chain

Offers

Offer	Endpoint	Price
Hook permissions Decode the permission bitmap a Uniswap v4 hook carries in its address: which callbacks it implements (beforeSwap, afterSwap, liquidity, donate) and whether it can take deltas from swaps or liquidity, with plain-language cautions. POST a JSON body {"address":"0x..."}, or GET with ?address= or the address appended to the path, e.g. permissions/0x...	`/m/v4-hooks/permissions`	0.02 USDG

Machine-readable: openapi.json with x-payment-info offers.

Try it live

Run the full MPP flow from your browser: catch the 402, sign the payment with your wallet, and watch it settle on-chain.

Pay with an agent

Any MPP or x402-compatible client works. With mppx, payment is automatic:

// x402 exact scheme (permit2) on Robinhood Chain
// 1. GET the endpoint, read the payment-required header (base64 JSON)
// 2. Sign PermitWitnessTransferFrom against Permit2 for the advertised offer
//    (spender = x402ExactPermit2Proxy, witness.to = merchant wallet)
// 3. Retry with the payment-signature header; settlement tx arrives
//    in the payment-response header
const res = await fetch('https://api.meshgateway.co/m/v4-hooks/permissions', {
  headers: { 'payment-signature': signedPaymentPayload },
})

Or inspect the challenge yourself:

curl -i https://api.meshgateway.co/m/v4-hooks/permissions
# HTTP/1.1 402 Payment Required
# WWW-Authenticate: Payment id="…", method="evm", intent="charge", …