Numeral

Numeral (Numeral HQ) is a sales-tax compliance and automation platform for ecommerce and SaaS companies. Its REST API calculates real-time sales tax by customer location at state, county, city, and district granularity, records transactions and refunds, and manages products and customers, while the broader platform handles registrations, nexus monitoring, filing, and remittance. Not to be confused with Numeral (numeral.io), an unrelated payment-operations company now part of Mambu.

Numeral publishes 6 APIs on the APIs.io network, including Customers API, Health API, Products API, and 3 more. Tagged areas include Sales Tax, Tax Compliance, Tax Calculation, E-Commerce, and Software-as-a-Service.

Numeral’s developer surface includes authentication, documentation, and 8 more developer resources.

🌐 Visit website 📡 Source on GitHub

34.9/100 thin ▬ flat Agent 22/100 agent aware Full breakdown ↓
scored 2026-08-25 · rubric v0.14.0

AccessFreemiumSelf serve⚡ Free to try

9 APIs

Sales Tax Tax Compliance Tax Calculation E-Commerce Software-as-a-Service

Kin Score

Kin Score How this is scored →
scored 2026-08-25 · rubric v0.14.0

Composite quality — 34.9/100 · thin

Contract Quality 12.3 / 25

Developer Ergonomics 4.3 / 20

Access Clarity 7.9 / 20

Operational Transparency 3.1 / 13

Contract Governance 0.0 / 12

Discoverability 7.4 / 10

Agent readiness — 22/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Surface 0 / 5

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/numeral: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 9

Individual APIs this provider publishes, each with its own machine-readable definition.

Rate Limits 1

Documented rate limits and quota policies.

Numeral Rate Limits

2 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Company 2

The organization behind the API

LinkedIn

Website

Website

Source (apis.yml)

aid: numeral
url: https://raw.githubusercontent.com/api-evangelist/numeral/refs/heads/main/apis.yml
name: Numeral
kind: company
description: Numeral (Numeral HQ) is a sales-tax compliance and automation platform for ecommerce and SaaS companies. Its
  REST API calculates real-time sales tax by customer location at state, county, city, and district granularity, records transactions
  and refunds, and manages products and customers, while the broader platform handles registrations, nexus monitoring, filing,
  and remittance. Not to be confused with Numeral (numeral.io), an unrelated payment-operations company now part of Mambu.
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/numeral.png
tags:
- Sales Tax
- Tax Compliance
- Tax Calculation
- E-Commerce
- Software-as-a-Service
tags_raw:
- Sales Tax
- Tax Compliance
- Tax Calculation
- Ecommerce
- SaaS
created: '2026-06-21'
modified: '2026-06-21'
specificationVersion: '0.23'
apis:
- aid: numeral:filings
  name: Numeral Filings API
  tags:
  - Filings
  - Remittance
  - Autofile
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://www.numeral.com/product/api
  baseURL: https://api.numeralhq.com
  properties:
  - url: https://docs.numeral.com/api-reference/introduction
    type: Documentation
  - url: https://www.numeral.com/pricing
    type: Plans
  description: Sales-tax return filing and remittance (Autofile) across all US states, driven by recorded transactions. Filing
    and remittance are delivered as managed platform services rather than self-serve public REST endpoints; transaction data
    captured via the API flows into them.
- aid: numeral:registrations-nexus
  name: Numeral Registrations & Nexus API
  tags:
  - Registrations
  - Nexus
  - Monitoring
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://www.numeral.com/product/api
  baseURL: https://api.numeralhq.com
  properties:
  - url: https://docs.numeral.com/api-reference/introduction
    type: Documentation
  - url: https://www.numeral.com/pricing
    type: Plans
  description: State sales-tax registration (Autoregister) and physical/economic nexus monitoring with state-crossing alerts.
    Provided as managed platform services on top of API-captured transaction data rather than as self-serve public REST endpoints.
- aid: numeral:webhooks
  name: Numeral Webhooks
  tags:
  - Webhook
  - Event
  - Notification
  tags_raw:
  - Webhooks
  - Events
  - Notifications
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://docs.numeral.com/api-reference/introduction
  baseURL: https://api.numeralhq.com
  properties:
  - url: https://docs.numeral.com/api-reference/introduction
    type: Documentation
  description: Event notifications for compliance and transaction lifecycle changes (e.g., filing, registration, and nexus
    events). Webhook delivery is offered through the Numeral platform; no public webhook subscription endpoint is documented
    in the REST API reference as of this writing (see review.yml).
- aid: numeral:numeral-customers-api
  name: Numeral Customers API
  description: The Customers API from Numeral — 2 operation(s) for customers.
  humanURL: https://docs.numeral.com/api-reference/introduction
  baseURL: https://api.numeralhq.com
  tags:
  - Customers
  properties:
  - type: OpenAPI
    url: openapi/numeral-customers-api-openapi.yml
  - type: Documentation
    url: https://docs.numeral.com/api-reference/introduction
  - type: APIReference
    url: https://docs.numeral.com/api-reference/v2026-03-01/endpoint/calculations
  - type: PostmanCollection
    url: collections/numeral.postman_collection.json
  - type: OpenCollection
    url: collections/numeral.opencollection.json
  - type: Documentation
    url: https://docs.numeral.com/api-reference/v2026-03-01/endpoint/transactions
  - type: Documentation
    url: https://docs.numeral.com/api-reference/v2026-03-01/endpoint/products
- aid: numeral:numeral-health-api
  name: Numeral Health API
  description: The Health API from Numeral — 1 operation(s) for health.
  humanURL: https://docs.numeral.com/api-reference/introduction
  baseURL: https://api.numeralhq.com
  tags:
  - Health
  properties:
  - type: OpenAPI
    url: openapi/numeral-health-api-openapi.yml
  - type: Documentation
    url: https://docs.numeral.com/api-reference/introduction
  - type: APIReference
    url: https://docs.numeral.com/api-reference/v2026-03-01/endpoint/calculations
  - type: PostmanCollection
    url: collections/numeral.postman_collection.json
  - type: OpenCollection
    url: collections/numeral.opencollection.json
  - type: Documentation
    url: https://docs.numeral.com/api-reference/v2026-03-01/endpoint/transactions
  - type: Documentation
    url: https://docs.numeral.com/api-reference/v2026-03-01/endpoint/products
- aid: numeral:numeral-products-api
  name: Numeral Products API
  description: The Products API from Numeral — 2 operation(s) for products.
  humanURL: https://docs.numeral.com/api-reference/introduction
  baseURL: https://api.numeralhq.com
  tags:
  - Product
  tags_raw:
  - Products
  properties:
  - type: OpenAPI
    url: openapi/numeral-products-api-openapi.yml
  - type: Documentation
    url: https://docs.numeral.com/api-reference/introduction
  - type: APIReference
    url: https://docs.numeral.com/api-reference/v2026-03-01/endpoint/calculations
  - type: PostmanCollection
    url: collections/numeral.postman_collection.json
  - type: OpenCollection
    url: collections/numeral.opencollection.json
  - type: Documentation
    url: https://docs.numeral.com/api-reference/v2026-03-01/endpoint/transactions
  - type: Documentation
    url: https://docs.numeral.com/api-reference/v2026-03-01/endpoint/products
- aid: numeral:numeral-refunds-api
  name: Numeral Refunds API
  description: The Refunds API from Numeral — 3 operation(s) for refunds.
  humanURL: https://docs.numeral.com/api-reference/introduction
  baseURL: https://api.numeralhq.com
  tags:
  - Refunds
  properties:
  - type: OpenAPI
    url: openapi/numeral-refunds-api-openapi.yml
  - type: Documentation
    url: https://docs.numeral.com/api-reference/introduction
  - type: APIReference
    url: https://docs.numeral.com/api-reference/v2026-03-01/endpoint/calculations
  - type: PostmanCollection
    url: collections/numeral.postman_collection.json
  - type: OpenCollection
    url: collections/numeral.opencollection.json
  - type: Documentation
    url: https://docs.numeral.com/api-reference/v2026-03-01/endpoint/transactions
  - type: Documentation
    url: https://docs.numeral.com/api-reference/v2026-03-01/endpoint/products
- aid: numeral:numeral-tax-calculations-api
  name: Numeral Tax Calculations API
  description: The Tax Calculations API from Numeral — 2 operation(s) for tax calculations.
  humanURL: https://docs.numeral.com/api-reference/introduction
  baseURL: https://api.numeralhq.com
  tags:
  - Tax Calculations
  properties:
  - type: OpenAPI
    url: openapi/numeral-tax-calculations-api-openapi.yml
  - type: Documentation
    url: https://docs.numeral.com/api-reference/introduction
  - type: APIReference
    url: https://docs.numeral.com/api-reference/v2026-03-01/endpoint/calculations
  - type: PostmanCollection
    url: collections/numeral.postman_collection.json
  - type: OpenCollection
    url: collections/numeral.opencollection.json
  - type: Documentation
    url: https://docs.numeral.com/api-reference/v2026-03-01/endpoint/transactions
  - type: Documentation
    url: https://docs.numeral.com/api-reference/v2026-03-01/endpoint/products
- aid: numeral:numeral-transactions-api
  name: Numeral Transactions API
  description: The Transactions API from Numeral — 2 operation(s) for transactions.
  humanURL: https://docs.numeral.com/api-reference/introduction
  baseURL: https://api.numeralhq.com
  tags:
  - Transaction
  tags_raw:
  - Transactions
  properties:
  - type: OpenAPI
    url: openapi/numeral-transactions-api-openapi.yml
  - type: Documentation
    url: https://docs.numeral.com/api-reference/introduction
  - type: APIReference
    url: https://docs.numeral.com/api-reference/v2026-03-01/endpoint/calculations
  - type: PostmanCollection
    url: collections/numeral.postman_collection.json
  - type: OpenCollection
    url: collections/numeral.opencollection.json
  - type: Documentation
    url: https://docs.numeral.com/api-reference/v2026-03-01/endpoint/transactions
  - type: Documentation
    url: https://docs.numeral.com/api-reference/v2026-03-01/endpoint/products
common:
- type: AgenticAccess
  url: agentic-access/numeral-agentic-access.yml
- type: DomainSecurity
  url: security/numeral-domain-security.yml
- type: Authentication
  url: authentication/numeral-authentication.yml
- type: GitHubOrganization
  url: https://github.com/numeralhq
- type: LinkedIn
  url: https://www.linkedin.com/company/numeralhq
- type: Website
  url: https://www.numeral.com/
- type: Documentation
  url: https://docs.numeral.com/api-reference/introduction
- type: Plans
  url: plans/numeral-plans-pricing.yml
- type: RateLimits
  url: rate-limits/numeral-rate-limits.yml
- type: FinOps
  url: finops/numeral-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/numeral"

All providers

curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/numeral/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/numeral/evidence"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no email required.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.