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Avalara Nexus API

Manage tax nexus declarations for companies

Avalara Nexus API is one of 73 APIs that Avalara publishes on the APIs.io network, described by a machine-readable OpenAPI specification and an AsyncAPI event-driven specification.

Tagged areas include Nexus. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, and an AsyncAPI specification.

This API exposes 15 operations across 8 paths, and defines 2 schemas. It is described by OpenAPI 3.2.0, at version 1.0.

Requests are made against 3 base URLs: https://rest.avatax.com, https://sandbox-rest.avatax.com, http://{{baseurl}}.

15 operations 8 paths 2 schemas 3 DELETE7 GET3 POST2 PUT

Metadata

The identity and technical contract details declared by the specification.

Specification
OpenAPI 3.2.0
API Version
1.0
Servers
https://rest.avatax.com
https://sandbox-rest.avatax.com
http://{{baseurl}}
Authentication
HTTP Basic, HTTP Bearer
Resource Areas
1

Authentication & Security 2

Avalara Nexus API declares 2 security schemes for authenticating requests. It accepts HTTP basic authentication (basicAuth). It accepts HTTP bearer tokens (bearerAuth).

  • basicAuth — Use your AvaTax username/password or accountId/licenseKey as basic auth credentials
  • bearerAuth — OAuth 2.0 bearer token

Paths & Operations 15

Across 8 paths, the API surfaces 15 operations — 3 DELETE, 7 GET, 3 POST, 2 PUT. Each is listed below with its method, path, parameters, and response codes.

Nexus 15

Manage tax nexus declarations for companies

GET
/api/v2/companies/{companyId}/nexus
Avalara List Nexus for a Company
listNexusByCompany 4 params → 200
POST
/api/v2/companies/{companyId}/nexus
Avalara Create Nexus for a Company
createNexus 1 param body → 201
POST
/api/v2/companies/{companyId}/nexus/{nexusId}/parameters
Avalara CreateNexusParameters
4 params body → 200
DELETE
/api/v2/companies/{companyId}/nexus/{nexusId}/parameters
Avalara DeleteNexusParameters
3 params → 200
GET
/api/v2/companies/{companyId}/nexus/{nexusId}/parameters
Avalara ListNexusParameters
3 params → 200
POST
/api/v2/companies/{companyId}/nexus/byaddress
Avalara DeclareNexusByAddress
3 params body → 200
DELETE
/api/v2/companies/{companyId}/nexus/{id}
Avalara DeleteNexus
3 params → 200
GET
/api/v2/companies/{companyId}/nexus/{id}
Avalara GetNexus
3 params → 200
PUT
/api/v2/companies/{companyId}/nexus/{id}
Avalara UpdateNexus
4 params body → 200
DELETE
/api/v2/companies/{companyId}/nexus/{nexusId}/parameters/{id}
Avalara DeleteNexusParameter
4 params → 200
GET
/api/v2/companies/{companyId}/nexus/{nexusId}/parameters/{id}
Avalara GetNexusParameter
4 params → 200
PUT
/api/v2/companies/{companyId}/nexus/{nexusId}/parameters/{id}
Avalara UpdateNexusParameter
5 params body → 200
GET
/api/v2/companies/{companyId}/nexus/byform/{formCode}
Avalara GetNexusByFormCode
3 params → 200
GET
/api/v2/companies/{companyId}/nexus/byTaxTypeGroup/{taxTypeGroup}
Avalara ListNexusByCompanyAndTaxTypeGroup
3 params → 200
GET
/api/v2/nexus
Avalara QueryNexus
1 param → 200

Schemas 2

The contract defines 2 schemas that model the data the API accepts and returns. The most detailed are NexusModel (12 properties), FetchResult_NexusModel (2 properties). Each schema is shown below with its type and property counts.

FetchResult_NexusModel
object
2 properties
NexusModel
object
12 properties

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

avalara-nexus-api-openapi.yml Raw ↑

Other APIs Avalara publishes across the network.

AvaTax SOAP API
Avalara Tax Content for Retail Configuration API
Self-Serve Tariff Classification API
License Guidance Order API
Avalara 1099 Forms API
Avalara Accounts API
Avalara Addresses API
Avalara AdvancedRules API
Avalara Attributes API
Avalara Authentication API
Avalara AvaFileForms API
Where this information came from

This is an independent, third-party profile of Avalara Nexus API, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.

The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.

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