Create a topic
Register a scalar feed verification topic to define the data schema for your data feeds.
Before creating a data feed, you need a verification topic that defines the data schema. Scalar feed topics use the fixed signature (int256 value) and are created on the Verification Topics & Issuers page.
Prerequisites
- Verification policy manager role (
claimPolicyManager) assigned on the System Access Manager - Issuer-Signed Scalar Feed addon installed (see Install addons)
Topic kinds
The platform supports three kinds of verification topics:
| Kind | Signature | Purpose |
|---|---|---|
| Verification | Custom ABI (e.g., (string), (uint256,bool)) | General-purpose identity verifications such as KYC or accreditation |
| Scalar feed | (int256 value) (fixed) | Numeric data feeds for prices, rates, and metrics |
| Bytes feed | Coming soon | Binary data feeds (not yet available) |
Only Scalar feed topics can be used when creating data feeds.
Steps
Navigate to Verification Topics & Issuers
Go to Platform Settings > Verification Topics & Issuers in the sidebar. This page lists all registered topics and trusted issuers.
Select the Scalar feed kind
Choose Scalar feed as the topic kind. The signature field automatically locks to (int256 value) and cannot be modified.
Enter a descriptive Topic name that identifies what data this topic represents (e.g., "FEED: BTC/USD", "FEED: Interest Rate").
Naming convention
While there is no enforced naming convention, prefixing feed topic names with "FEED:" helps distinguish them from compliance verification topics in dropdown lists.
Confirm the transaction
Click Continue to see the summary, then click Add topic and enter your PIN to authenticate the on-chain transaction.
Verify the topic was created
After the transaction confirms, the new topic appears in the verification topics list. It is now available for use when creating data feeds and when configuring trusted issuers.
Next steps
After creating a topic:
- Add a trusted issuer for this topic so that an identity can publish feed updates. See Configure trusted issuers.
- Create a feed that uses this topic. See Create a feed.
Troubleshooting
| Issue | Solution |
|---|---|
| Add topic button not visible | Verify you have the Verification policy manager role on the System Access Manager |
| Scalar feed option not available | Ensure the Issuer-Signed Scalar Feed addon is installed |
| Topic name already exists | Choose a unique name; duplicate topic names are not allowed |
| Transaction fails | Check that your wallet has sufficient gas and PIN/OTP is configured |