Sphere

Sphere is a developer-first global indirect tax compliance platform that automates sales tax, VAT, and GST across nexus monitoring, registration, real-time calculation, and filing/remittance. Its REST API lets billing and checkout flows call the Sphere tax engine to calculate tax on transactions and export transaction data, authenticated with an X-API-KEY header.

Sphere publishes 2 API contracts indexed on the APIs.io network: Tax Calculation API and Transactions Export API. Tagged areas include Tax, Sales Tax, VAT, GST, and Compliance.

The Sphere catalog on APIs.io includes 1 Spectral governance ruleset.

Sphere’s developer surface includes authentication, documentation, engineering blog, and 8 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

27.1/100 thin ▬ flat Agent 26/100 agent aware Front door AI 4/6 moderate Heartbeat 100/100 alive saas Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessPaid

1 published contract

Tax Sales Tax VAT GST Compliance Fintech

What this lets a business do 1

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Tax Management

BC-220

Tax Calculation

POST /tax_api/calculate_tax

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 27.1/100 · thin

Contract Quality 9.8 / 19

Developer Ergonomics 4.8 / 15

Access Clarity 0.6 / 15

Operational Transparency 0.5 / 10

Contract Governance 1.2 / 9

Discoverability 5.0 / 8

Regulatory Posture 0.9 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 26/100 · 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 7 / 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 Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship Ask about this →
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented) Ask about this →
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented) Ask about this →

7 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Access Clarity scores 4.3 — up to +19.1 composite points Ask about this →
Developer Ergonomics scores 32.1 — up to +13.6 composite points Ask about this →
Operational Transparency scores 4.8 — up to +12.4 composite points Ask about this →

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/sphere-tax/apis.yml: open an issue on github.com/api-evangelist/sphere-tax to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
E-invoicing and Tax Compliance (certified operators)	standard	54.1	-	1
Stripe App Marketplace and Partner Ecosystem (builders on Stripe)	standard	54.1	-	1

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

APIs 2

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

Sphere Tax Calculation API

The Tax Calculation API from Sphere — 1 operation(s) for tax calculation.

Sphere Transactions Export API

The Transactions Export API from Sphere — 3 operation(s) for transactions export.

Open Collections 3

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

Sphere Tax Tax Calculation API

OPEN COLLECTION

Sphere Tax Tax Calculation Transactions Export API

OPEN COLLECTION

Sphere Tax API

OPEN COLLECTION

Sphere API pricing

Not yet checked against Sphere's own pricing page. Compiled by API Evangelist on 2026-06-21 from www.getsphere.com/pricing; confirm before you rely on a figure.

Plan	Price
Starter subscription	—
Growth enterprise	—

Plan details, limits and sources →

Rate limits

API Request Limits: see provider documentation requests
Transaction Volume: 50000 transactions

Compiled by API Evangelist, not yet checked against Sphere's documentation. Rate-limit details →

Pricing Plans 1

Published pricing tiers and plan structures.

Sphere Plans Pricing

2 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Sphere Rate Limits

2 limits

RATE LIMITS

FinOps 1

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

Sphere Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

Sphere API Rules

58 rules · 56 error-severity 1 warn-severity 1 info-severity

SPECTRAL

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Sphere Authentication

apiKey · 1 scheme

SECURITY

Sphere Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Agentic Access (API Evangelist recommendations) 1

Recommended x-agentic-access execution contracts for AI agents.

Sphere Agentic Access

4 operations · 2 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

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 3

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Source (apis.yml)

aid: sphere-tax
url: https://raw.githubusercontent.com/api-evangelist/sphere-tax/refs/heads/main/apis.yml
name: Sphere
kind: company
description: Sphere is a developer-first global indirect tax compliance platform that automates sales tax, VAT, and GST across
  nexus monitoring, registration, real-time calculation, and filing/remittance. Its REST API lets billing and checkout flows
  call the Sphere tax engine to calculate tax on transactions and export transaction data, authenticated with an X-API-KEY
  header.
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: paid
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Paid
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-13'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/sphere-tax.png
x-docs-platform: gitbook
x-docs-platform-confidence: high
x-docs-platform-checked: 2026-10-04
tags:
- Tax
- Sales Tax
- VAT
- GST
- Compliance
- Fintech
tags_raw:
- Tax
- Sales Tax
- VAT
- GST
- Compliance
- FinTech
created: '2026-06-21'
modified: '2026-06-21'
specificationVersion: '0.23'
apis:
- aid: sphere-tax:sphere-tax-tax-calculation-api
  name: Sphere Tax Calculation API
  description: The Tax Calculation API from Sphere — 1 operation(s) for tax calculation.
  humanURL: https://docs.getsphere.com/features/integrations/api/tax-calculation
  baseURL: https://server.getsphere.com
  tags:
  - Tax Calculation
  properties:
  - type: OpenAPI
    url: openapi/sphere-tax-tax-calculation-api-openapi.yml
  - type: Documentation
    url: https://docs.getsphere.com/features/integrations/api/tax-calculation
  - type: APIReference
    url: https://docs.getsphere.com/features/integrations/api
  - type: PostmanCollection
    url: collections/sphere-tax.postman_collection.json
  - type: OpenCollection
    url: collections/sphere-tax.opencollection.json
  - type: Documentation
    url: https://docs.getsphere.com/features/reports/transaction-export
  - type: Documentation
    url: https://docs.getsphere.com/features/registration
  - type: Documentation
    url: https://docs.getsphere.com/features/filing-and-remittance
  - type: Documentation
    url: https://docs.getsphere.com/features/monitoring
  - type: Documentation
    url: https://docs.getsphere.com/features/calculation
  - type: Documentation
    url: https://docs.getsphere.com/features/integrations
- aid: sphere-tax:sphere-tax-transactions-export-api
  name: Sphere Transactions Export API
  description: The Transactions Export API from Sphere — 3 operation(s) for transactions export.
  humanURL: https://docs.getsphere.com/features/integrations/api/tax-calculation
  baseURL: https://server.getsphere.com
  tags:
  - Transactions Export
  properties:
  - type: OpenAPI
    url: openapi/sphere-tax-transactions-export-api-openapi.yml
  - type: Documentation
    url: https://docs.getsphere.com/features/integrations/api/tax-calculation
  - type: APIReference
    url: https://docs.getsphere.com/features/integrations/api
  - type: PostmanCollection
    url: collections/sphere-tax.postman_collection.json
  - type: OpenCollection
    url: collections/sphere-tax.opencollection.json
  - type: Documentation
    url: https://docs.getsphere.com/features/reports/transaction-export
  - type: Documentation
    url: https://docs.getsphere.com/features/registration
  - type: Documentation
    url: https://docs.getsphere.com/features/filing-and-remittance
  - type: Documentation
    url: https://docs.getsphere.com/features/monitoring
  - type: Documentation
    url: https://docs.getsphere.com/features/calculation
  - type: Documentation
    url: https://docs.getsphere.com/features/integrations
common:
- type: CapabilityMap
  url: capabilities/sphere-tax-capability-edges.yml
  name: Sphere Business Capability Map
- type: AgenticAccess
  url: agentic-access/sphere-tax-agentic-access.yml
- type: DomainSecurity
  url: security/sphere-tax-domain-security.yml
- type: Authentication
  url: authentication/sphere-tax-authentication.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/getsphere
- type: Website
  url: https://www.getsphere.com/
- type: Documentation
  url: https://docs.getsphere.com/
- type: Plans
  url: plans/sphere-tax-plans-pricing.yml
- type: RateLimits
  url: rate-limits/sphere-tax-rate-limits.yml
- type: FinOps
  url: finops/sphere-tax-finops.yml
- url: https://www.getsphere.com/blog
  type: Blog
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Sphere API — frequently asked questions

Does Sphere have an API?

Yes. APIs.io lists 2 APIs from Sphere, including Sphere Tax Calculation API and Sphere Transactions Export API.

Is there an OpenAPI specification for the Sphere API?

Yes. APIs.io indexes 2 OpenAPI specifications for Sphere, each linked for download from this page.

How do I authenticate with the Sphere API?

Sphere uses bearer-token authentication (apiKey · 1 scheme). The details are profiled on APIs.io as Sphere Authentication.

How much does the Sphere API cost?

APIs.io lists 2 pricing plans for Sphere, with each plan's price, limits and inclusions under Pricing on this page.

Is the Sphere API ready for AI agents?

Sphere has a Kin Score of 27.1 out of 100 (thin) and an Agent Readiness score of 26.3 (agent-aware), scored by API Evangelist on 2026-11-13.

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