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You can listen to bridge events that occur during the transfer lifecycle for each provider in the kit. Events for the built-in CCTP provider follow its transaction steps. You can subscribe to each event multiple times with different callbacks.

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Event types

This section lists the CCTP event types to which you can subscribe.

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Approve

Emitted when the transaction is approved. This happens when the transaction signer has approved the transfer amount on the source chain.
TypeScript
kit.on("approve", (payload) => {
  console.log("Approval completed:", payload.values.txHash);
});

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Burn

Emitted when tokens are burned on the source chain.
TypeScript
kit.on("burn", (payload) => {
  console.log("Burn completed:", payload.values.txHash);
});

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Attestation

Emitted when the kit receives the attestation, which serves as proof of the burn.
TypeScript
kit.on("fetchAttestation", (payload) => {
  console.log("Attestation completed:", payload.values.data.attestation);
});

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Mint

Emitted when tokens are minted on the destination chain.
TypeScript
kit.on("mint", (payload) => {
  console.log("Mint completed:", payload.values.txHash);
});

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*

Listen to all events.
TypeScript
kit.on("*", (payload) => {
  console.log("Event received:", payload);
});