TaxJar Sales Tax API
66
AI ReadinessAI-Aware (B)66/100
Official vendor OpenAPI document · agent-readyPaymentsBilling Subscriptionsbearer22 EndpointsREST
For Agents
Programmatically list tax categories, calculate sales tax for an order. Covers 22 operations with bearer authentication.
Use for: I need to tax categories, I want to calculate sales tax for an order, Search for an order transaction, Find all order transactions
Not supported: Does not handle communications, crm, or developer tools - use for payments only.
TaxJar's API makes it easy to calculate sales tax, manage order transactions, and maintain up-to-date tax rates. The API exposes 22 endpoints secured with bearer authentication.
Install Jentic One Beta
Connect the TaxJar Sales Tax API to your agent
Jentic One is a self-hosted execution layer for AI agents. It lets your agent call the TaxJar Sales Tax API, or any other public or private API you need. You set the rules, the agent never sees your credentials, and every call is logged.
Two steps, two machines. Install the instance in a safe environment, then register your agent from wherever it runs.
1
Step 1: Jentic One Host machine
# On the machine that will host your Jentic One instance:
curl -fsSL "https://jentic.com/install.sh?src=apis&api=%2Fapis%2Ftaxjar.com%2Ftaxjar" | sh2
Step 2: Agent machine
# On the machine where your agent runs (keep this separate from the instance):
curl -fsSL "https://jentic.com/install.sh?src=apis&api=%2Fapis%2Ftaxjar.com%2Ftaxjar" | sh
jentic register # connects your agent to your Jentic One instanceJentic One is in public beta. The setup above keeps your agent separate from the instance, which is what you want before using real credentials: an agent running as the same OS user as Jentic One can read its stored keys directly. Just evaluating? A single local install is fine to start. See the secure deployment guide for the tiers.
Capabilities
What an agent can do with TaxJar Sales Tax API.
List tax categories
Calculate sales tax for an order
Create an order transaction
Show an order transaction
Update an order transaction
Delete an order transaction
Use Cases
Patterns agents use TaxJar Sales Tax API for, with concrete tasks.
★ Payments Operations
Use the TaxJar Sales Tax API to perform payments operations programmatically. The API provides 22 endpoints covering core functionality including list tax categories, calculate sales tax for an order, create an order transaction.
Call GET /categories to list tax categories
Automated Categories Management
Automate categories operations by combining multiple TaxJar Sales Tax API endpoints. Agents can calculate sales tax for an order and then create an order transaction in a single workflow.
Call POST /taxes to calculate sales tax for an order, then verify the result
AI Agent Integration via Jentic
AI agents discover and call TaxJar Sales Tax API endpoints through Jentic without managing credentials directly. An agent searches for the required operation by intent, receives the matching endpoint schema, and executes the call with Jentic-managed authentication. This eliminates the need to read API documentation or handle bearer tokens manually.
Search Jentic for 'list tax categories', load the operation schema, and execute with Jentic-managed credentials
Key Endpoints
22 endpoints — taxjar's api makes it easy to calculate sales tax, manage order transactions, and maintain up-to-date tax rates.
METHOD
PATH
DESCRIPTION
GET
/categories
List tax categories
POST
/taxes
Calculate sales tax for an order
POST
/transactions/orders
Create an order transaction
GET
/transactions/orders
List order transactions
GET
/transactions/orders/{transaction_id}
Show an order transaction
PUT
/transactions/orders/{transaction_id}
Update an order transaction
DELETE
/transactions/orders/{transaction_id}
Delete an order transaction
POST
/transactions/refunds
Create a refund transaction
GET
/categories
List tax categories
POST
/taxes
Calculate sales tax for an order
POST
/transactions/orders
Create an order transaction
GET
/transactions/orders
List order transactions
GET
/transactions/orders/{transaction_id}
Show an order transaction
PUT
/transactions/orders/{transaction_id}
Update an order transaction
DELETE
/transactions/orders/{transaction_id}
Delete an order transaction
POST
/transactions/refunds
Create a refund transaction
Jentic AI Readiness Score
This API is usable in Jentic One now. Its AI-readiness score against Jentic's framework shows where it stands today and where improvements would make it even easier for agents to use.
T
TaxJar Sales Tax API
- AI-Aware (B)66/100
99
Foundational Compliance62
Developer Experience & Jentic Compatibility47
AI-Readiness & Agent Experience94
Agent Usability60
Security72
AI DiscoverabilityPowered by JenticScoring Framework 1.0.0 | Scoring Engine 0.4.0
Show dimension breakdown
99
Foundational Compliance
Base layer of spec validity and structural soundness.
Grade: A+Signals: 4
97%
Lint Results
Aggregated quality score from linter diagnostics, weighted by severity.
100%
Resolution Completeness
Percentage of `$ref` references that resolve successfully.
100%
Specification Validity
Checks whether the API description parses successfully and conforms to its declared specification (e.g., OpenAPI).
100%
Structural Integrity
Structural correctness score based on schema issues using logarithmic dampening.
62
Developer Experience & Jentic Compatibility
Clarity, completeness, and ingestion readiness for developers and tooling.
Grade: B-Signals: 4
0%
Example Density
How richly the API is illustrated with examples.
100%
Example Validity
Percentage of examples that conform to their schemas.
47%
Response Coverage
Percentage of operations with complete response definitions (success, client error, server error).
100%
Tooling Readiness
Health of API ingestion, bundling, and resolution within Jentic pipelines.
47
AI-Readiness & Agent Experience
Semantic breadth, depth, and agent comprehension for AI systems.
Grade: D+Signals: 4
27%
Description Coverage
Coverage of descriptions across API elements.
0%
Error Standardization
Coverage of RFC 9457 Problem Details for error responses.
100%
OperationId Quality
Coverage, uniqueness, and casing consistency of operationIds for AI inference.
63%
Summary Coverage
Coverage of summaries across operations/tags/info.
94
Agent Usability
Functional utility, complexity comfort, and AI orchestration readiness.
Grade: A+Signals: 1
94%
Complexity Comfort
Agent comfort level based on API operational and structural complexity.
60
Security
Trust, risk posture, and security compliance.
Grade: B-Signals: 1
60%
Authentication Strength
Average quality of security schemes based on authentication method strength (weakest link for OAuth2).
72
AI Discoverability
Findability, semantic richness, and reasoning readiness.
Grade: A-Signals: 1
72%
Descriptive Richness
Clarity and depth of descriptions across API elements.
Score it yourself
Every API in the directory is allowlisted, so you can re-score it with no key required.
npx @jentic/api-scorecard-cli score <openapi-url>Why Jentic?
What agents get from Jentic-routed access to this vendor.
Setup
Wiring the TaxJar Sales Tax API by hand means managing its bearer token, choosing between the api.taxjar.com and sandbox hosts, and building your own retry handling across tax and order calls. Through Jentic you install once, import the TaxJar Sales Tax API from the API Directory, store the token once, and your agent calls it.
Permission scoping
The TaxJar Sales Tax API puts the transaction id in the URL path (/transactions/orders/{transaction_id}), so a rule can pin your agent to reading orders and calculating tax. You choose the operations it may call, so destructive ones like deleting or updating an order are not included unless you add them.
Credential isolation
Your TaxJar token is stored once, encrypted, by your own Jentic One instance and injected at execution time. It never enters the agent's prompt, logs, or context.
Intent-based discovery
Agents search Jentic by intent such as 'calculate sales tax' or 'list tax categories', and Jentic returns the matching TaxJar Sales Tax API operation with its input schema so the agent calls the right endpoint without browsing the reference docs.
Related APIs
Alternatives and complements available in the Jentic catalogue.
Alternative
Stripe
Alternative payments API
Choose Stripe when you need a different approach to payments operations
FAQs
Specific to using TaxJar Sales Tax API through Jentic.
What authentication does the TaxJar Sales Tax API use?
The TaxJar Sales Tax API uses a Bearer token in the Authorization header. Through Jentic, these credentials are stored encrypted in your Jentic One instance and injected at execution time, so raw secrets never enter the agent context.
Can I list tax categories with the TaxJar Sales Tax API?
Yes. Use the GET /categories endpoint. The API returns structured JSON responses that agents can parse and act on directly.
What are the rate limits for the TaxJar Sales Tax API?
Rate limits are not specified in the OpenAPI spec. Check the vendor documentation for current limits. Through Jentic, rate limiting is handled automatically with retry logic built into the execution layer.
How do I list tax categories through Jentic?
Install the Jentic SDK with pip install jentic, authenticate through Jentic One, the self-hosted execution layer, then search for 'list tax categories'. Jentic returns the matching TaxJar Sales Tax API operation with its input schema. Load the schema and execute the call - credentials are injected automatically.
How many endpoints does the TaxJar Sales Tax API have?
The TaxJar Sales Tax API exposes 22 endpoints covering categories, taxes, orders operations.
Can I limit what my agent is allowed to do with the TaxJar Sales Tax API?
Yes. Because you run Jentic One yourself, your own rules decide which TaxJar operations and credentials the agent may use. You can pin the agent to read-only work such as GET /categories, POST /taxes to calculate sales tax, and GET /transactions/orders/{transaction_id} to read an order, while leaving out destructive calls like PUT or DELETE on /transactions/orders. Only the operations you explicitly grant are callable, so the agent never updates or deletes an order transaction unless you add that permission.
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