Many wallets do not "create" or "credit" tokens; the blockchain records token ownership and any wallet simply reads that state. Non-custodial wallets may automatically detect tokens and display them in the interface, while custodial exchanges decide whether to credit an airdrop to user balances. This distinction matters for users expecting liquid, spendable tokens after an airdrop.
How non-custodial wallets handle airdrops
Non-custodial wallets such as MetaMask, Coinbase Wallet, and Trust Wallet provide token detection features that scan the chain and surface ERC-20 and compatible tokens in the UI. This behavior is documented by the MetaMask team at ConsenSys in the MetaMask documentation, by the Coinbase Wallet team at Coinbase in their support materials, and by the Trust Wallet team at Trust Wallet in their help pages. Detection merely makes a token visible; the token was already present on-chain at the recipient address. If a token contract is nonstandard, private, or new, a wallet may not display it automatically and the user must add the token contract address manually to see the balance.
Custodial services and the decision to credit
Custodial platforms such as major exchanges operate differently. Exchanges like Binance and Coinbase evaluate an airdrop's technical compatibility, legal risks, and economic impact before announcing whether they will credit the token to customer accounts. Their public support statements appear in exchange announcements and support posts authored by each platform’s communications or operations teams. Because custodial services control private keys, they alone can choose to credit users; airmarked tokens on-chain do not automatically become exchange balances.
Relevance, causes, and consequences follow from these mechanics. Users who custody their own keys retain full entitlement to on-chain airdrops but may face friction converting or using tokens if wallets do not auto-display them or if networks require high transaction fees. Cultural and territorial nuances matter when exchanges or projects restrict distribution for regulatory reasons, leaving users in some jurisdictions unable to access credited tokens even if they hold the underlying private key. Scams and dusting attacks also exploit automatic detection, so trustworthy wallets and exchanges remain cautious and document policies to protect users, reflecting governance choices by the MetaMask team ConsenSys, the Coinbase Wallet team Coinbase, and the Trust Wallet team Trust Wallet.