# PullSource

> **PullSource** = `string` \| ((`pieceCid`) => `string`)

Defined in: [packages/synapse-sdk/src/types.ts:611](https://github.com/FilOzone/synapse-sdk/blob/e66c35ddb1749f0e55bae2e4f430d1449cca89bd/packages/synapse-sdk/src/types.ts#L611)

Source for pulling pieces from another provider.
Either a base URL string or a function that returns a piece URL for a given PieceCID.