compsapi-com

CompsAPI provides a public API delivering eBay sold listings data with up to 1,095 days of price history and the real accepted Best Offer price. It returns up to 240 sales per GET request as JSON, replacing eBay findCompletedItems and Marketplace Insights workflows. The service offers a free tier with an API key, as well as paid plans for higher volume. The company focuses on giving developers easy access to historical eBay sales data for pricing analysis and market research.

compsapi-com publishes 4 API contracts indexed on the APIs.io network, including Comps API, Health API, Sold API, and 1 more. Tagged areas include Company, eBay, Data, Pricing, and Marketplace.

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

compsapi-com’s developer surface includes changelog, authentication, engineering blog, documentation, pricing, signup flow, support, and 24 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

64.2/100 strong Agent 34/100 agent ready Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

1 published contract 1 MCP Servers 1 Agent Skills

Company eBay Data Pricing Marketplace

Kin Score

Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0

Composite quality — 64.2/100 · strong

Contract Quality 11.9 / 21

Developer Ergonomics 7.6 / 17

Access Clarity 12.4 / 17

Operational Transparency 6.6 / 11

Contract Governance 8.1 / 10

Discoverability 5.5 / 9

Regulatory Posture 5.1 / 15

Agent readiness — 34/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 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

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 could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% 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):

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)
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
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)
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks

6 more unmet checks in the Agent Readiness table above.

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

Developer Ergonomics scores 44.5 — up to +11.1 composite points
Contract Quality scores 55.9 — up to +11.0 composite points
Access Clarity scores 73.2 — up to +5.4 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/compsapi-com/apis.yml: open an issue on github.com/api-evangelist/compsapi-com 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 →

APIs 4

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

compsapi-com Comps API

The Comps API from compsapi-com — 1 operation(s) for comps.

compsapi-com Health API

The Health API from compsapi-com — 1 operation(s) for health.

compsapi-com Sold API

The Sold API from compsapi-com — 1 operation(s) for sold.

compsapi-com Usage API

The Usage API from compsapi-com — 1 operation(s) for usage.

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

compsapi-com MCP Server

Remote MCP server at api.compsapi.com.

MCP SERVER

Agent Skills 1

Packaged agent skills for driving this provider's APIs from an AI assistant.

search-sold-listings

AGENT SKILL

Pricing Plans 1

Published pricing tiers and plan structures.

Compsapi Com Plans Pricing

4 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Compsapi Com Rate Limits

4 limits

RATE LIMITS

Semantic Vocabularies 1

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

Compsapi Com Context

5 classes · 57 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

compsapi-com API Rules

9 rules · 7 errors 1 warnings 1 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.

Compsapi Com Openapi Overlay

0 actions · update · compsapi-com-openapi.json

DERIVED

JSON Schema 1

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

SoldResponse

16 properties

JSON SCHEMA

Security Posture 2

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

Compsapi Com Authentication

2 schemes

SECURITY

Compsapi Com Domain Security

TLSv1.3 · HSTS

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Compsapi Com Scopes

OAuth 2.0 · no documented scopes

0 scopes

SCOPES

Agentic Access 1

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

Compsapi Com Agentic Access

4 operations

4 operations · 0 acting

AGENTIC

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

Login

SignUp

SignUp

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgentSkill

LLMsTxt

MCPServer

Design & Contract 7

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

Conventions

ErrorCatalog

Conformance

Scroll for all 7

Build 1

SDKs, sample code, and the tooling you integrate with

ToolCrosswalk

ToolCrosswalk

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 5

Status, limits, changes, and where to get help

RateLimits

ChangeLog

ChangeLog

StatusPage

Support

Commercial 4

Pricing, plans, and the legal terms of use

Plans

Pricing

PrivacyPolicy

TermsOfService

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: compsapi-com
name: compsapi-com
description: CompsAPI provides a public API delivering eBay sold listings data with up to 1,095 days of price history and
  the real accepted Best Offer price. It returns up to 240 sales per GET request as JSON, replacing eBay findCompletedItems
  and Marketplace Insights workflows. The service offers a free tier with an API key, as well as paid plans for higher volume.
  The company focuses on giving developers easy access to historical eBay sales data for pricing analysis and market research.
url: https://artifacts.apis.io/compsapi-com/apis.yml
image: https://compsapi.com/og.png
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-30 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-30'
modified: '2026-10-30'
tags:
- Company
- eBay
- Data
- Pricing
- Marketplace
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/compsapi-com-agentic-access.yml
- type: RateLimits
  url: rate-limits/compsapi-com-rate-limits.yml
- type: Plans
  url: plans/compsapi-com-plans-pricing.yml
- type: Spectral
  url: rules/compsapi-com-rules.yml
- type: JSONLD
  url: json-ld/compsapi-com-context.jsonld
- type: Vocabulary
  url: vocabulary/compsapi-com-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DataModel
  url: data-model/compsapi-com-data-model.yml
- type: ChangeLog
  url: changelog/compsapi-com-changelog.yml
- type: Conventions
  url: conventions/compsapi-com-conventions.yml
- type: Authentication
  url: authentication/compsapi-com-authentication.yml
- type: ErrorCatalog
  url: errors/compsapi-com-problem-types.yml
- type: Conformance
  url: conformance/compsapi-com-conformance.yml
- type: LLMsTxt
  url: llms/compsapi-com-llms.txt
- type: ToolCrosswalk
  url: mcp/compsapi-com-tool-crosswalk.yml
- type: MCPServer
  url: mcp/compsapi-com-mcp.yml
- type: Hosts
  url: hosts/compsapi-com-hosts.yml
- type: Vendors
  url: vendors/compsapi-com-vendors.yml
- type: DeveloperPortal
  url: https://api.compsapi.com</span
- type: DomainSecurity
  url: security/compsapi-com-domain-security.yml
- type: Website
  url: https://compsapi.com/
- type: Blog
  url: https://compsapi.com/blog
- type: ChangeLog
  url: https://compsapi.com/changelog
- type: Documentation
  url: https://compsapi.com/docs
- type: Login
  url: https://app.compsapi.com
- type: Pricing
  url: https://compsapi.com/pricing
- type: PrivacyPolicy
  url: https://compsapi.com/privacy
- type: SignUp
  url: https://app.compsapi.com
- type: StatusPage
  url: https://compsapi.com/status
- type: Support
  url: https://app.compsapi.com/support
- type: TermsOfService
  url: https://compsapi.com/terms
apis:
- aid: compsapi-com:compsapi-com-comps-api
  name: compsapi-com Comps API
  description: The Comps API from compsapi-com — 1 operation(s) for comps.
  humanURL: https://compsapi.com/docs
  baseURL: https://api.compsapi.com
  tags:
  - Comps
  properties:
  - type: OpenAPI
    url: openapi/compsapi-com-comps-api-openapi.yml
  - type: JSONSchema
    url: json-schema/compsapi-com-sold-response-schema.json
- aid: compsapi-com:compsapi-com-health-api
  name: compsapi-com Health API
  description: The Health API from compsapi-com — 1 operation(s) for health.
  humanURL: https://compsapi.com/docs
  baseURL: https://api.compsapi.com
  tags:
  - Health
  properties:
  - type: OpenAPI
    url: openapi/compsapi-com-health-api-openapi.yml
  - type: JSONSchema
    url: json-schema/compsapi-com-sold-response-schema.json
- aid: compsapi-com:compsapi-com-sold-api
  name: compsapi-com Sold API
  description: The Sold API from compsapi-com — 1 operation(s) for sold.
  humanURL: https://compsapi.com/docs
  baseURL: https://api.compsapi.com
  tags:
  - Sold
  properties:
  - type: OpenAPI
    url: openapi/compsapi-com-sold-api-openapi.yml
  - type: JSONSchema
    url: json-schema/compsapi-com-sold-response-schema.json
- aid: compsapi-com:compsapi-com-usage-api
  name: compsapi-com Usage API
  description: The Usage API from compsapi-com — 1 operation(s) for usage.
  humanURL: https://compsapi.com/docs
  baseURL: https://api.compsapi.com
  tags:
  - Usage
  properties:
  - type: OpenAPI
    url: openapi/compsapi-com-usage-api-openapi.yml
  - type: JSONSchema
    url: json-schema/compsapi-com-sold-response-schema.json
x-coverage:
  state: gated
  reason: partner-login
  method: derived
  generated: '2026-10-30'
  generator: derive-coverage.py (pre-flight evidence)
  detail: the company serves an API surface but requires credentials before any description of it can be read
  evidence:
  - url: https://compsapi.com/openapi.json
    status: null
  - url: https://api.compsapi.com/openapi.json
    status: null
  - url: https://api.compsapi.com/mcp
    status: 401
  - url: https://compsapi.com/
    status: 200
x-enrichment:
  date: '2026-10-30'
  status: enriched
  artifacts_added: 33
  pass: modular-v1
  engine: identity=oss,contract=oss,surfaces=oss,docs=oss,regulatory=oss

compsapi-com — frequently asked questions

Does compsapi-com have an API?

Yes. APIs.io lists 4 APIs from compsapi-com, including compsapi-com Comps API, compsapi-com Health API and compsapi-com Sold API, and 1 more.

Is there an OpenAPI specification for the compsapi-com?

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

How do I authenticate with the compsapi-com?

compsapi-com uses bearer-token authentication (2 schemes). The details are profiled on APIs.io as Compsapi Com Authentication.

How much does the compsapi-com cost?

APIs.io lists 4 pricing plans for compsapi-com, with each plan's price, limits and inclusions under Pricing Plans on this page.

Does compsapi-com have an MCP server?

Yes. APIs.io lists 1 MCP server for compsapi-com: Remote MCP server at api.compsapi.com.

Is the compsapi-com ready for AI agents?

compsapi-com has a Kin Score of 64.2 out of 100 (strong) and an Agent Readiness score of 33.9 (agent-ready), scored by API Evangelist on 2026-10-31.

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