Tradera

Tradera is Sweden’s largest online marketplace for buying and selling second‑hand goods, ranging from collectibles and fashion to electronics and vehicles. The platform connects millions of users, offering a secure environment for auctions and direct sales, with features such as buyer protection, seller ratings, and integrated payment solutions. Tradera’s vibrant community fosters sustainable commerce by giving items a second life, supporting both hobbyists and everyday shoppers across a wide variety of categories.

Tradera publishes 11 API contracts indexed on the APIs.io network, including Auth API, Buyer API, Categories API, and 8 more. Tagged areas include Marketplace, E-Commerce, Secondhand, Auctions, and Sweden.

The Tradera catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Tradera’s developer surface includes support, signup flow, API reference, authentication, and 15 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

33.1/100 thin ▼ -5.6 Agent 23/100 agent aware Heartbeat 24/100 dormant Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

1 published contract

Marketplace E-Commerce Secondhand Auctions Sweden

Kin Score

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

Composite quality — 33.1/100 · thin

Contract Quality 9.7 / 19

Developer Ergonomics 2.7 / 15

Access Clarity 2.6 / 15

Operational Transparency 0.3 / 10

Contract Governance 2.0 / 9

Discoverability 5.5 / 8

Regulatory Posture 3.1 / 15

Create-or-Update Ergonomics 2.8 / 10

Agent readiness — 23/100 · 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 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 4 / 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 0 / 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
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
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link

9 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 17.1 — up to +16.6 composite points
Developer Ergonomics scores 17.9 — up to +16.4 composite points
Operational Transparency scores 2.6 — up to +12.7 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/tradera/apis.yml: open an issue on github.com/api-evangelist/tradera 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 11

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

Tradera Auth API

The Auth API from Tradera — 5 operation(s) for auth.

Tradera Buyer API

The Buyer API from Tradera — 3 operation(s) for buyer.

Tradera Categories API

The Categories API from Tradera — 2 operation(s) for categories.

Tradera Items API

The Items API from Tradera — 5 operation(s) for items.

Tradera Listings API

The Listings API from Tradera — 24 operation(s) for listings.

Tradera Orders API

The Orders API from Tradera — 5 operation(s) for orders.

Tradera Program API

The Program API from Tradera — 2 operation(s) for program.

Tradera Reference Data API

The Reference Data API from Tradera — 7 operation(s) for reference data.

Tradera Search API

The Search API from Tradera — 5 operation(s) for search.

Tradera Tradera.Api.Services.Core API

The Tradera.Api.Services.Core API from Tradera — 4 operation(s) for tradera.api.services.core.

Tradera Users API

The Users API from Tradera — 6 operation(s) for users.

Scroll for all 11

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Tradera Context

104 classes · 288 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Tradera API Rules

11 rules · 7 errors 1 warnings 3 info

SPECTRAL

OpenAPI Overlays 1

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Tradera Openapi Overlay

0 actions · update

DERIVED

JSON Schema 6

Standalone JSON Schema definitions for this provider's data models.

ItemRequest

24 properties

JSON SCHEMA

Item

51 properties

JSON SCHEMA

SellerOrder

14 properties

JSON SCHEMA

ShippingCode

6 properties

JSON SCHEMA

ShopItemData

20 properties

JSON SCHEMA

ShopItemVariantData

22 properties

JSON SCHEMA

Security Posture 2

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

Tradera Authentication

apiKey · 4 schemes

SECURITY

Tradera Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

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

Tradera Agentic Access

72 operations · 32 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

APIReference

APIReference

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

LLMsTxt

LLMsTxt

WellKnown

WellKnown

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

Conformance

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: tradera
name: Tradera
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: http://static.tradera.net/nextweb/_next/static/media/open-graph-tradera-default.0fjg-i_g1_yum.png
description: Tradera is Sweden’s largest online marketplace for buying and selling second‑hand goods, ranging from collectibles
  and fashion to electronics and vehicles. The platform connects millions of users, offering a secure environment for auctions
  and direct sales, with features such as buyer protection, seller ratings, and integrated payment solutions. Tradera’s vibrant
  community fosters sustainable commerce by giving items a second life, supporting both hobbyists and everyday shoppers across
  a wide variety of categories.
url: https://raw.githubusercontent.com/api-evangelist/tradera/refs/heads/main/apis.yml
x-type: company
x-source: harvest:stockholm-trip
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-15 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-15'
modified: '2026-10-15'
tags:
- Marketplace
- E-Commerce
- Secondhand
- Auctions
- Sweden
tags_raw:
- Marketplace
- E-commerce
- Secondhand
- Auctions
- Sweden
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/tradera-agentic-access.yml
- type: Spectral
  url: rules/tradera-rules.yml
- type: JSONLD
  url: json-ld/tradera-context.jsonld
- type: Vocabulary
  url: vocabulary/tradera-vocabulary.yml
- type: DataModel
  url: data-model/tradera-data-model.yml
- type: Conformance
  url: conformance/tradera-conformance.yml
- type: LLMsTxt
  url: llms/tradera-llms.txt
- type: WellKnown
  url: well-known/tradera-well-known.yml
- type: Hosts
  url: hosts/tradera-hosts.yml
- type: Vendors
  url: vendors/tradera-vendors.yml
- type: TermsOfService
  url: https://www.tradera.com/support/se/terms/terms-and-conditions/
- type: Support
  url: https://www.tradera.com/support/se/
- type: SignUp
  url: https://www.tradera.com/register
- type: PrivacyPolicy
  url: https://www.tradera.com/support/se/terms/Privacy-Statement/
- type: APIReference
  url: https://api.tradera.com/llms.txt
- type: GitHubOrganization
  url: https://github.com/tradera
- type: Authentication
  url: authentication/tradera-authentication.yml
- type: DomainSecurity
  url: security/tradera-domain-security.yml
- type: Website
  url: https://tradera.com/
apis:
- aid: tradera:tradera-auth-api
  name: Tradera Auth API
  description: The Auth API from Tradera — 5 operation(s) for auth.
  humanURL: https://api.tradera.com/v4/swagger/index.html
  baseURL: https://api.tradera.com
  tags:
  - Authentication
  tags_raw:
  - Auth
  properties:
  - type: OpenAPI
    url: openapi/tradera-auth-api-openapi.yml
  - type: JSONSchema
    url: json-schema/tradera-shop-item-data-schema.json
  - type: JSONSchema
    url: json-schema/tradera-shop-item-variant-data-schema.json
  - type: JSONSchema
    url: json-schema/tradera-item-schema.json
  - type: JSONSchema
    url: json-schema/tradera-item-request-schema.json
  - type: JSONSchema
    url: json-schema/tradera-shipping-code-schema.json
  - type: JSONSchema
    url: json-schema/tradera-seller-order-schema.json
- aid: tradera:tradera-buyer-api
  name: Tradera Buyer API
  description: The Buyer API from Tradera — 3 operation(s) for buyer.
  humanURL: https://api.tradera.com/v4/swagger/index.html
  baseURL: https://api.tradera.com
  tags:
  - Buyer
  properties:
  - type: OpenAPI
    url: openapi/tradera-buyer-api-openapi.yml
  - type: JSONSchema
    url: json-schema/tradera-shop-item-data-schema.json
  - type: JSONSchema
    url: json-schema/tradera-shop-item-variant-data-schema.json
  - type: JSONSchema
    url: json-schema/tradera-item-schema.json
  - type: JSONSchema
    url: json-schema/tradera-item-request-schema.json
  - type: JSONSchema
    url: json-schema/tradera-shipping-code-schema.json
  - type: JSONSchema
    url: json-schema/tradera-seller-order-schema.json
- aid: tradera:tradera-categories-api
  name: Tradera Categories API
  description: The Categories API from Tradera — 2 operation(s) for categories.
  humanURL: https://api.tradera.com/v4/swagger/index.html
  baseURL: https://api.tradera.com
  tags:
  - Categories
  properties:
  - type: OpenAPI
    url: openapi/tradera-categories-api-openapi.yml
  - type: JSONSchema
    url: json-schema/tradera-shop-item-data-schema.json
  - type: JSONSchema
    url: json-schema/tradera-shop-item-variant-data-schema.json
  - type: JSONSchema
    url: json-schema/tradera-item-schema.json
  - type: JSONSchema
    url: json-schema/tradera-item-request-schema.json
  - type: JSONSchema
    url: json-schema/tradera-shipping-code-schema.json
  - type: JSONSchema
    url: json-schema/tradera-seller-order-schema.json
- aid: tradera:tradera-items-api
  name: Tradera Items API
  description: The Items API from Tradera — 5 operation(s) for items.
  humanURL: https://api.tradera.com/v4/swagger/index.html
  baseURL: https://api.tradera.com
  tags:
  - Item
  tags_raw:
  - Items
  properties:
  - type: OpenAPI
    url: openapi/tradera-items-api-openapi.yml
  - type: JSONSchema
    url: json-schema/tradera-shop-item-data-schema.json
  - type: JSONSchema
    url: json-schema/tradera-shop-item-variant-data-schema.json
  - type: JSONSchema
    url: json-schema/tradera-item-schema.json
  - type: JSONSchema
    url: json-schema/tradera-item-request-schema.json
  - type: JSONSchema
    url: json-schema/tradera-shipping-code-schema.json
  - type: JSONSchema
    url: json-schema/tradera-seller-order-schema.json
- aid: tradera:tradera-listings-api
  name: Tradera Listings API
  description: The Listings API from Tradera — 24 operation(s) for listings.
  humanURL: https://api.tradera.com/v4/swagger/index.html
  baseURL: https://api.tradera.com
  tags:
  - Listings
  properties:
  - type: OpenAPI
    url: openapi/tradera-listings-api-openapi.yml
  - type: JSONSchema
    url: json-schema/tradera-shop-item-data-schema.json
  - type: JSONSchema
    url: json-schema/tradera-shop-item-variant-data-schema.json
  - type: JSONSchema
    url: json-schema/tradera-item-schema.json
  - type: JSONSchema
    url: json-schema/tradera-item-request-schema.json
  - type: JSONSchema
    url: json-schema/tradera-shipping-code-schema.json
  - type: JSONSchema
    url: json-schema/tradera-seller-order-schema.json
- aid: tradera:tradera-orders-api
  name: Tradera Orders API
  description: The Orders API from Tradera — 5 operation(s) for orders.
  humanURL: https://api.tradera.com/v4/swagger/index.html
  baseURL: https://api.tradera.com
  tags:
  - Order
  tags_raw:
  - Orders
  properties:
  - type: OpenAPI
    url: openapi/tradera-orders-api-openapi.yml
  - type: JSONSchema
    url: json-schema/tradera-shop-item-data-schema.json
  - type: JSONSchema
    url: json-schema/tradera-shop-item-variant-data-schema.json
  - type: JSONSchema
    url: json-schema/tradera-item-schema.json
  - type: JSONSchema
    url: json-schema/tradera-item-request-schema.json
  - type: JSONSchema
    url: json-schema/tradera-shipping-code-schema.json
  - type: JSONSchema
    url: json-schema/tradera-seller-order-schema.json
- aid: tradera:tradera-program-api
  name: Tradera Program API
  description: The Program API from Tradera — 2 operation(s) for program.
  humanURL: https://api.tradera.com/v4/swagger/index.html
  baseURL: https://api.tradera.com
  tags:
  - Program
  properties:
  - type: OpenAPI
    url: openapi/tradera-program-api-openapi.yml
  - type: JSONSchema
    url: json-schema/tradera-shop-item-data-schema.json
  - type: JSONSchema
    url: json-schema/tradera-shop-item-variant-data-schema.json
  - type: JSONSchema
    url: json-schema/tradera-item-schema.json
  - type: JSONSchema
    url: json-schema/tradera-item-request-schema.json
  - type: JSONSchema
    url: json-schema/tradera-shipping-code-schema.json
  - type: JSONSchema
    url: json-schema/tradera-seller-order-schema.json
- aid: tradera:tradera-reference-data-api
  name: Tradera Reference Data API
  description: The Reference Data API from Tradera — 7 operation(s) for reference data.
  humanURL: https://api.tradera.com/v4/swagger/index.html
  baseURL: https://api.tradera.com
  tags:
  - Reference Data
  properties:
  - type: OpenAPI
    url: openapi/tradera-reference-data-api-openapi.yml
  - type: JSONSchema
    url: json-schema/tradera-shop-item-data-schema.json
  - type: JSONSchema
    url: json-schema/tradera-shop-item-variant-data-schema.json
  - type: JSONSchema
    url: json-schema/tradera-item-schema.json
  - type: JSONSchema
    url: json-schema/tradera-item-request-schema.json
  - type: JSONSchema
    url: json-schema/tradera-shipping-code-schema.json
  - type: JSONSchema
    url: json-schema/tradera-seller-order-schema.json
- aid: tradera:tradera-search-api
  name: Tradera Search API
  description: The Search API from Tradera — 5 operation(s) for search.
  humanURL: https://api.tradera.com/v4/swagger/index.html
  baseURL: https://api.tradera.com
  tags:
  - Search
  properties:
  - type: OpenAPI
    url: openapi/tradera-search-api-openapi.yml
  - type: JSONSchema
    url: json-schema/tradera-shop-item-data-schema.json
  - type: JSONSchema
    url: json-schema/tradera-shop-item-variant-data-schema.json
  - type: JSONSchema
    url: json-schema/tradera-item-schema.json
  - type: JSONSchema
    url: json-schema/tradera-item-request-schema.json
  - type: JSONSchema
    url: json-schema/tradera-shipping-code-schema.json
  - type: JSONSchema
    url: json-schema/tradera-seller-order-schema.json
- aid: tradera:tradera-tradera-api-services-core-api
  name: Tradera Tradera.Api.Services.Core API
  description: The Tradera.Api.Services.Core API from Tradera — 4 operation(s) for tradera.api.services.core.
  humanURL: https://api.tradera.com/v4/swagger/index.html
  baseURL: https://api.tradera.com
  tags:
  - Tradera.Api.Services.Core
  properties:
  - type: OpenAPI
    url: openapi/tradera-tradera-api-services-core-api-openapi.yml
  - type: JSONSchema
    url: json-schema/tradera-shop-item-data-schema.json
  - type: JSONSchema
    url: json-schema/tradera-shop-item-variant-data-schema.json
  - type: JSONSchema
    url: json-schema/tradera-item-schema.json
  - type: JSONSchema
    url: json-schema/tradera-item-request-schema.json
  - type: JSONSchema
    url: json-schema/tradera-shipping-code-schema.json
  - type: JSONSchema
    url: json-schema/tradera-seller-order-schema.json
- aid: tradera:tradera-users-api
  name: Tradera Users API
  description: The Users API from Tradera — 6 operation(s) for users.
  humanURL: https://api.tradera.com/v4/swagger/index.html
  baseURL: https://api.tradera.com
  tags:
  - User
  tags_raw:
  - Users
  properties:
  - type: OpenAPI
    url: openapi/tradera-users-api-openapi.yml
  - type: JSONSchema
    url: json-schema/tradera-shop-item-data-schema.json
  - type: JSONSchema
    url: json-schema/tradera-shop-item-variant-data-schema.json
  - type: JSONSchema
    url: json-schema/tradera-item-schema.json
  - type: JSONSchema
    url: json-schema/tradera-item-request-schema.json
  - type: JSONSchema
    url: json-schema/tradera-shipping-code-schema.json
  - type: JSONSchema
    url: json-schema/tradera-seller-order-schema.json
x-enrichment:
  date: '2026-10-15'
  status: enriched
  artifacts_added: 17
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Tradera API — frequently asked questions

Does Tradera have an API?

Yes. APIs.io lists 11 APIs from Tradera, including Tradera Auth API, Tradera Buyer API and Tradera Categories API, and 8 more.

Is there an OpenAPI specification for the Tradera API?

Yes. APIs.io indexes 11 OpenAPI specifications for Tradera, each linked for download from this page.

How do I authenticate with the Tradera API?

Tradera uses bearer-token authentication (apiKey · 4 schemes). The details are profiled on APIs.io as Tradera Authentication.

Is the Tradera API ready for AI agents?

Tradera has a Kin Score of 33.1 out of 100 (thin) and an Agent Readiness score of 22.7 (agent-aware), scored by API Evangelist on 2026-11-06.

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