Crypto check

Your wallet extensions answer any site. This page asks only what needs no popup.

Lists the wallet extensions in this browser, from their EIP-6963 announcements or the window.ethereum, Solana and Bitcoin globals. Warns when several fight over window.ethereum.

Asks each extension for accounts (eth_accounts) and network (eth_chainId). Both are silent and return only what you already approved here, which should be nothing. Phantom is asked with onlyIfTrusted, which never opens a popup.

Shows whether WebUSB, WebHID, Web Serial and Web Bluetooth exist here, the paths a Ledger or Trezor uses, and whether this site's Permissions-Policy turns them off. It never asks for a device.

What a drainer site asks for:

eth_requestAccounts
  connect, see your addresses
eth_signTypedData_v4
  Permit or Permit2: tokens
  move on one signature
setApprovalForAll
  a whole NFT collection
increaseAllowance
  a higher spend limit

Matching the first four and last four isn't enough: attackers plant lookalikes in your history. Check the whole address.

examples, don't send

real 0x1a93180bfeaf3f5a418c
     3f45428db2e681174bcc
fake 0x1a9339b32f58b305b300
     0eca1df83bdc97464bcc

both shown as 0x1a93...4bcc

Block height, the block reward now and after the next halving, blocks until then, and the chain's size on disk. These and the prices on the first page come from this site's /prices.json, so your browser never calls a price API.