# Matters API

**Canonical:** https://apis.io/apis/thomson-reuters/matters-api/  
**Provider:** Thomson Reuters — https://apis.io/providers/thomson-reuters/  
**Base URL:** https://api.thomsonreuters.com/legal-tracker/matters-api/v1  
**Documentation:** https://developers.thomsonreuters.com/pages/api-catalog/0caa6ecb-2358-45a5-aa51-1a5b5c3c965d

Matters API is one of 324 APIs that [Thomson Reuters](https://apis.io/providers/thomson-reuters/) publishes on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. Tagged areas include Legal and Legal Tracker. The published artifact set on APIs.io includes an OpenAPI specification and API documentation.

The Matters API exposes endpoints to create, update and retrieve a matter. Batching of matter requests is also supported through the $batch endpoint.

## Operations (47)

| Method | Path | Summary |
|---|---|---|
| GET | `/Matters` | Get entities from Matters |
| GET | `/Matters('{MatterId}')` | Get entity from Matters by key |
| GET | `/Matters('{MatterId}')/BilledToEntity` | Get related BilledToEntity |
| GET | `/Matters('{MatterId}')/APRoute` | Get related APRoute |
| GET | `/Matters('{MatterId}')/Country` | Get related Country |
| GET | `/Matters('{MatterId}')/MatterType` | Get related MatterType |
| GET | `/Matters('{MatterId}')/PracticeGroup` | Get related PracticeGroup |
| GET | `/Matters('{MatterId}')/OrgUnit` | Get related OrgUnit |
| GET | `/Matters('{MatterId}')/SubstantiveLaw` | Get related SubstantiveLaw |
| GET | `/Matters('{MatterId}')/MatterCustomTreeNodeField` | Get related MatterCustomTreeNodeField |
| GET | `/Matters('{MatterId}')/MatterCustomCurrencyField` | Get related MatterCustomCurrencyField |
| GET | `/Matters('{MatterId}')/MatterCustomRichTextAreaField` | Get related MatterCustomRichTextAreaField |
| GET | `/Matters('{MatterId}')/MatterCustomNumberField` | Get related MatterCustomNumberField |
| GET | `/Matters('{MatterId}')/MatterCustomDropdownField` | Get related MatterCustomDropdownField |
| GET | `/Matters('{MatterId}')/MatterCustomTextField` | Get related MatterCustomTextField |
| GET | `/Matters('{MatterId}')/MatterCustomDateField` | Get related MatterCustomDateField |
| GET | `/Matters('{MatterId}')/State` | Get related State |
| GET | `/Matters('{MatterId}')/MatterCustomTextAreaField` | Get related MatterCustomTextAreaField |
| GET | `/Matters('{MatterId}')/MatterAllocation` | Get related MatterAllocation |
| GET | `/Matters('{MatterId}')/LeadCompanyPerson` | Get related LeadCompanyPerson |
| GET | `/Matters('{MatterId}')/LeadOutsideCounsel` | Get related LeadOutsideCounsel |
| GET | `/Matters('{MatterId}')/MatterCreator` | Get related MatterCreator |
| GET | `/Matters('{MatterId}')/No2CompanyPerson` | Get related No2CompanyPerson |
| GET | `/Matters('{MatterId}')/Accruals` | Get entities from related Accruals |
| GET | `/Matters('{MatterId}')/Invoices` | Get entities from related Invoices |
| GET | `/Matters('{MatterId}')/Budgets` | Get entities from related Budgets |
| GET | `/Matters('{MatterId}')/InvoiceAllocations` | Get entities from related InvoiceAllocations |
| GET | `/Matters('{MatterId}')/InvoiceLines` | Get entities from related InvoiceLines |
| GET | `/Matters('{MatterId}')/Timekeepers` | Get entities from related Timekeepers |
| GET | `/Matters('{MatterId}')/MatterFirms` | Get entities from related MatterFirms |
| GET | `/Matters('{MatterId}')/TimekeeperRateSheets` | Get entities from related TimekeeperRateSheets |
| GET | `/Matters('{MatterId}')/MatterParticipants` | Get entities from related MatterParticipants |
| GET | `/Matters('{MatterId}')/InvoiceReductions` | Get entities from related InvoiceReductions |
| GET | `/Matters('{MatterId}')/InvoiceTaxes` | Get entities from related InvoiceTaxes |
| GET | `/matters` | Retrieves all matters |
| POST | `/matters` | Create a new matter record |
| GET | `/matters/{id}` | Find a matter by ID |
| PATCH | `/matters/{id}` | Update field values for an existing matter identified by the Tracker matter ID |
| GET | `/matters/{id}/financials` | Returns matter financials by ID |
| GET | `/matters({key}='{value}')` | Find a matter by Tracker Matter ID or Associated Matter ID in alternate keys… |
| PATCH | `/matters({key}='{value}')` | Update field values for an existing matter identified by the Tracker Matter ID… |
| GET | `/templates/{id}` | Returns a matter template by id |
| GET | `/templates` | Returns a list of matter templates |
| GET | `/template-types` | Returns a list of types for matter template |
| GET | `/template-types/{id}` | Returns a matter template type by ID |
| GET | `/fields` | Returns a list of matter fields |
| GET | `/fields/{id}` | Returns a matter field by ID |

## Machine-readable artifacts (3)

- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/thomson-reuters/refs/heads/main/openapi/thomson-reuters-matters-api-openapi.yml
- **OpenAPI** — https://api.thomsonreuters.com/developer-experience/content/v1/documents/api-reference/29da33aa-c567-444d-bff5-5bfbe836ff5f
- **Documentation** — https://developers.thomsonreuters.com/pages/api-catalog/0caa6ecb-2358-45a5-aa51-1a5b5c3c965d

## Other Thomson Reuters APIs (12)

- [Thomson Reuters Westlaw API](https://apis.io/apis/thomson-reuters/westlaw-api/)
- [Thomson Reuters Checkpoint API](https://apis.io/apis/thomson-reuters/checkpoint-api/)
- [Thomson Reuters Risk and Fraud API](https://apis.io/apis/thomson-reuters/risk-fraud-api/)
- [Datasets API](https://apis.io/apis/thomson-reuters/datasets-api/)
- [Exports API](https://apis.io/apis/thomson-reuters/exports-api/)
- [Tax Return Import/Export API](https://apis.io/apis/thomson-reuters/tax-return-import-export-api/)
- [Companies API](https://apis.io/apis/thomson-reuters/companies-api/)
- [Prints API](https://apis.io/apis/thomson-reuters/prints-api/)
- [Reports API](https://apis.io/apis/thomson-reuters/reports-api/)
- [Firms API](https://apis.io/apis/thomson-reuters/firms-api/)
- [Users API](https://apis.io/apis/thomson-reuters/users-api/)
- [Thomson Reuters Account API](https://apis.io/apis/thomson-reuters/thomson-reuters-account-api/)

## Tags

Legal, Legal Tracker

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/thomson-reuters/matters-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/thomson-reuters/.