GunTab

GunTab is a payment processing service designed for online firearms marketplaces and retail websites. The GunTab API enables businesses to integrate safe and convenient firearms transaction payments into their platforms.

GunTab publishes 4 API contracts indexed on the APIs.io network, including FFLs API, Invoices API, Users API, and 1 more. Tagged areas include E-Commerce, Firearms, Marketplace, and Payments.

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

GunTab’s developer surface includes engineering blog, authentication, documentation, signup flow, and 7 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

29.9/100 thin ▬ flat Agent 21/100 agent aware Front door AI 1/6 silent Heartbeat 0/100 dormant saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract

E-Commerce Firearms Marketplace Payments

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 29.9/100 · thin

Contract Quality 8.8 / 19

Developer Ergonomics 3.6 / 15

Access Clarity 3.2 / 15

Operational Transparency 0.8 / 10

Contract Governance 1.2 / 9

Discoverability 4.3 / 8

Regulatory Posture 1.6 / 15

Create-or-Update Ergonomics 2.8 / 10

Agent readiness — 21/100 · 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 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 Payments 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
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)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document

8 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 21.1 — up to +15.8 composite points
Developer Ergonomics scores 23.8 — up to +15.2 composite points
Contract Quality scores 47.0 — up to +13.3 composite points

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.

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/guntab/apis.yml: open an issue on github.com/api-evangelist/guntab 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 →

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 4

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

GunTab FFLs API

Federal Firearms License verification

GunTab Invoices API

Payment request lifecycle management

GunTab Users API

Marketplace user lookup

GunTab Webhooks API

Webhook subscription management (deprecated)

Open Collections 5

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

GunTab REST FFLs API

OPEN COLLECTION

GunTab REST FFLs Invoices API

OPEN COLLECTION

GunTab REST FFLs Users API

OPEN COLLECTION

GunTab REST FFLs Webhooks API

OPEN COLLECTION

GunTab REST API

OPEN COLLECTION

GunTab API pricing

Not yet checked against GunTab's own pricing page. Compiled by API Evangelist on 2026-05-04; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free freemium	Free
Professional paid	Free
Enterprise enterprise	—

Plan details, limits and sources →

Rate limits

Free Tier Default: 10 requests per minute
Free Tier Monthly Quota: 1000 requests per month
Professional Tier Default: 100 requests per minute

Compiled by API Evangelist, not yet checked against GunTab's documentation. All 5 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Guntab Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Guntab Rate Limits

5 limits

RATE LIMITS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

GunTab

SLA

FinOps 1

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

Guntab Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

GunTab API Rules

59 rules · 57 errors 1 warnings 1 info

SPECTRAL

Security Posture 2

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

Guntab Authentication

apiKey · 1 scheme

SECURITY

Guntab Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Agentic Access 1

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

Guntab Agentic Access

11 operations · 8 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

Signup

Signup

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

Blog

Blog

BlogRSS

BlogRSS

Website

Website

Source (apis.yml)

aid: guntab
name: GunTab
description: GunTab is a payment processing service designed for online firearms marketplaces and retail websites. The GunTab
  API enables businesses to integrate safe and convenient firearms transaction payments into their platforms.
type: Index
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: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/guntab.png
tags:
- E-Commerce
- Firearms
- Marketplace
- Payments
url: https://raw.githubusercontent.com/api-evangelist/guntab/refs/heads/main/apis.yml
created: '2025-02-17'
modified: '2026-10-06'
specificationVersion: '0.23'
apis:
- aid: guntab:guntab-ffls-api
  name: GunTab FFLs API
  description: Federal Firearms License verification
  humanURL: https://www.guntab.com/documentation/rest-api
  baseURL: https://api.guntab.com/v1
  tags:
  - FFLs
  properties:
  - type: OpenAPI
    url: openapi/guntab-ffls-api-openapi.yml
  - type: Documentation
    url: https://www.guntab.com/documentation/rest-api
  - type: Authentication
    url: https://www.guntab.com/documentation/rest-api#authentication
- aid: guntab:guntab-invoices-api
  name: GunTab Invoices API
  description: Payment request lifecycle management
  humanURL: https://www.guntab.com/documentation/rest-api
  baseURL: https://api.guntab.com/v1
  tags:
  - Invoices
  properties:
  - type: OpenAPI
    url: openapi/guntab-invoices-api-openapi.yml
  - type: Documentation
    url: https://www.guntab.com/documentation/rest-api
  - type: Authentication
    url: https://www.guntab.com/documentation/rest-api#authentication
- aid: guntab:guntab-users-api
  name: GunTab Users API
  description: Marketplace user lookup
  humanURL: https://www.guntab.com/documentation/rest-api
  baseURL: https://api.guntab.com/v1
  tags:
  - User
  tags_raw:
  - Users
  properties:
  - type: OpenAPI
    url: openapi/guntab-users-api-openapi.yml
  - type: Documentation
    url: https://www.guntab.com/documentation/rest-api
  - type: Authentication
    url: https://www.guntab.com/documentation/rest-api#authentication
- aid: guntab:guntab-webhooks-api
  name: GunTab Webhooks API
  description: Webhook subscription management (deprecated)
  humanURL: https://www.guntab.com/documentation/rest-api
  baseURL: https://api.guntab.com/v1
  tags:
  - Webhook
  tags_raw:
  - Webhooks
  properties:
  - type: OpenAPI
    url: openapi/guntab-webhooks-api-openapi.yml
  - type: Documentation
    url: https://www.guntab.com/documentation/rest-api
  - type: Authentication
    url: https://www.guntab.com/documentation/rest-api#authentication
common:
- type: Plans
  url: plans/guntab-plans-pricing.yml
- type: RateLimits
  url: rate-limits/guntab-rate-limits.yml
- type: FinOps
  url: finops/guntab-finops.yml
- url: https://www.guntab.com/insights/
  type: Blog
- url: https://www.guntab.com/insights/rss/
  type: BlogRSS
- type: AgenticAccess
  url: agentic-access/guntab-agentic-access.yml
- type: DomainSecurity
  url: security/guntab-domain-security.yml
- type: Authentication
  url: authentication/guntab-authentication.yml
- type: Website
  url: https://www.guntab.com/
- type: Documentation
  url: https://www.guntab.com/documentation/rest-api
- type: Signup
  url: https://www.guntab.com/sign-up
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

GunTab API — frequently asked questions

Does GunTab have an API?

Yes. APIs.io lists 4 APIs from GunTab, including GunTab FFLs API, GunTab Invoices API and GunTab Users API, and 1 more.

Is there an OpenAPI specification for the GunTab API?

Yes. APIs.io indexes 4 OpenAPI specifications for GunTab, each linked for download from this page.

How do I authenticate with the GunTab API?

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

How much does the GunTab API cost?

APIs.io lists 3 pricing plans for GunTab, with each plan's price, limits and inclusions under Pricing on this page.

Is the GunTab API ready for AI agents?

GunTab has a Kin Score of 29.9 out of 100 (thin) and an Agent Readiness score of 21.3 (agent-aware), scored by API Evangelist on 2026-11-06.

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