tracetail-io

TraceTail provides a browser fingerprinting API that identifies returning visitors without cookies or local storage. It turns over 40 browser signals into a stable visitor ID that remains consistent across normal and incognito windows. The service offers 1,000 free requests each month, enabling developers to recognize users reliably while respecting privacy.

tracetail-io publishes 4 API contracts indexed on the APIs.io network, including Identification API, Server API, Service API, and 1 more. Tagged areas include Browser Fingerprinting, Privacy, Analytics, API, and Device Identification.

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

tracetail-io’s developer surface includes authentication, documentation, pricing, engineering blog, signup flow, and 27 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

61.5/100 strong Agent 51/100 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

Browser FingerprintingPrivacy AnalyticsAPIDevice Identification

Kin Score

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

Composite quality — 61.5/100 · strong

Contract Quality 13.3 / 21

Developer Ergonomics 6.4 / 17

Access Clarity 10.8 / 17

Operational Transparency 5.0 / 11

Contract Governance 8.1 / 10

Discoverability 5.5 / 9

Regulatory Posture 6.0 / 15

Agent readiness — 51/100 · 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 9 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 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 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):

A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
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
Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too
Agentic Commerce Well-Known Document +5 pts — a parsing /.well-known/ucp.json or acp.json declaring a version and at least one service — `self` when its endpoints are on the provider's own domain, `platform` when they are on a vendor's

3 more unmet checks in the Agent Readiness table above.

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

Developer Ergonomics scores 37.4 — up to +12.5 composite points
Contract Quality scores 62.7 — up to +9.3 composite points
Access Clarity scores 63.7 — up to +7.3 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/tracetail-io/apis.yml: open an issue on github.com/api-evangelist/tracetail-io 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.

tracetail-io Identification API

What the browser SDK calls.

tracetail-io Server API

What a customer's backend calls to verify identifications, with a secret server key.

tracetail-io Service API

Health and first-party proxy checks.

tracetail-io Setup links API

How an AI agent gets API keys for the person it works for: a link they open to sign in and add a card or continue without a card.

MCP Servers 1

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

tracetail-io MCP Server

Remote MCP server at tracetail.io.

MCP SERVER

Agent Skills 1

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

tracetail-io-identify

AGENT SKILL

Pricing Plans 1

Published pricing tiers and plan structures.

Tracetail Io Plans Pricing

2 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Tracetail Io Rate Limits

2 limits

RATE LIMITS

Semantic Vocabularies 1

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

Tracetail Io Context

8 classes · 35 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

tracetail-io API Rules

17 rules · 13 errors 1 warnings 3 info

SPECTRAL

JSON Schema 6

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

DetailedIdentification

0 properties

JSON SCHEMA

IdentificationRequest

4 properties

JSON SCHEMA

Identification

6 properties

JSON SCHEMA

ServerIdentification

14 properties

JSON SCHEMA

SetupLink

9 properties

JSON SCHEMA

Visitor

9 properties

JSON SCHEMA

Security Posture 3

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

Tracetail Io Authentication

3 schemes

SECURITY

Tracetail Io Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Tracetail Io Vulnerability Disclosure

security.txt · contact published

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Tracetail Io Scopes

OAuth 2.0 · no documented scopes

0 scopes

SCOPES

Agentic Access 1

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

Tracetail Io Agentic Access

8 operations · 3 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 5

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgentSkill

LLMsTxt

MCPServer

WellKnown

Design & Contract 8

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

Idempotency

Conventions

ErrorCatalog

Conformance

Scroll for all 8

Build 2

SDKs, sample code, and the tooling you integrate with

SDKs

SDKs

Packages

Packages

Access & Security 5

Authentication, authorization, and security posture

Security

Security

Authentication

Authentication

SecurityTxt

SecurityTxt

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

RateLimits

RateLimits

StatusPage

StatusPage

Commercial 4

Pricing, plans, and the legal terms of use

Plans

Pricing

TermsOfService

PrivacyPolicy

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: tracetail-io
name: tracetail-io
description: TraceTail provides a browser fingerprinting API that identifies returning visitors without cookies or local storage.
  It turns over 40 browser signals into a stable visitor ID that remains consistent across normal and incognito windows. The
  service offers 1,000 free requests each month, enabling developers to recognize users reliably while respecting privacy.
url: https://artifacts.apis.io/tracetail-io/apis.yml
image: https://tracetail.io/favicon.svg
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-31 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-31'
modified: '2026-10-31'
tags:
- Browser Fingerprinting
- Privacy
- Analytics
- API
- Device Identification
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/tracetail-io-agentic-access.yml
- type: RateLimits
  url: rate-limits/tracetail-io-rate-limits.yml
- type: Plans
  url: plans/tracetail-io-plans-pricing.yml
- type: Spectral
  url: rules/tracetail-io-rules.yml
- type: JSONLD
  url: json-ld/tracetail-io-context.jsonld
- type: Vocabulary
  url: vocabulary/tracetail-io-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DataModel
  url: data-model/tracetail-io-data-model.yml
- type: Idempotency
  url: conventions/tracetail-io-conventions.yml
- type: Conventions
  url: conventions/tracetail-io-conventions.yml
- type: Security
  url: security/tracetail-io-vulnerability-disclosure.yml
- type: Authentication
  url: authentication/tracetail-io-authentication.yml
- type: ErrorCatalog
  url: errors/tracetail-io-problem-types.yml
- type: Conformance
  url: conformance/tracetail-io-conformance.yml
- type: LLMsTxt
  url: llms/tracetail-io-llms.txt
- type: MCPServer
  url: mcp/tracetail-io-mcp.yml
- type: SecurityTxt
  url: well-known/tracetail-io-security.txt
- type: WellKnown
  url: well-known/tracetail-io-well-known.yml
- type: Hosts
  url: hosts/tracetail-io-hosts.yml
- type: Vendors
  url: vendors/tracetail-io-vendors.yml
- type: SDKs
  url: packages/tracetail-io-packages.yml
- type: Packages
  url: packages/tracetail-io-packages.yml
- type: StatusPage
  url: https://tracetail.io/status
- type: VulnerabilityDisclosure
  url: security/tracetail-io-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/tracetail-io-domain-security.yml
- type: Website
  url: https://tracetail.io/
- type: Documentation
  url: https://tracetail.io/docs
- type: Pricing
  url: https://tracetail.io/pricing
- type: Blog
  url: https://tracetail.io/blog
- type: TermsOfService
  url: https://tracetail.io/terms-and-conditions
- type: PrivacyPolicy
  url: https://tracetail.io/privacy-policy
- type: SignUp
  url: https://tracetail.io/auth
apis:
- aid: tracetail-io:tracetail-io-identification-api
  name: tracetail-io Identification API
  description: What the browser SDK calls.
  humanURL: https://tracetail.io/docs
  baseURL: https://tracetail.io
  tags:
  - Identification
  properties:
  - type: OpenAPI
    url: openapi/tracetail-io-identification-api-openapi.yml
  - type: JSONSchema
    url: json-schema/tracetail-io-server-identification-schema.json
  - type: JSONSchema
    url: json-schema/tracetail-io-setup-link-schema.json
  - type: JSONSchema
    url: json-schema/tracetail-io-visitor-schema.json
  - type: JSONSchema
    url: json-schema/tracetail-io-identification-schema.json
  - type: JSONSchema
    url: json-schema/tracetail-io-identification-request-schema.json
  - type: JSONSchema
    url: json-schema/tracetail-io-detailed-identification-schema.json
- aid: tracetail-io:tracetail-io-server-api-api
  name: tracetail-io Server API
  description: What a customer's backend calls to verify identifications, with a secret server key.
  humanURL: https://tracetail.io/docs
  baseURL: https://tracetail.io
  tags:
  - Server API
  properties:
  - type: OpenAPI
    url: openapi/tracetail-io-server-api-api-openapi.yml
  - type: JSONSchema
    url: json-schema/tracetail-io-server-identification-schema.json
  - type: JSONSchema
    url: json-schema/tracetail-io-setup-link-schema.json
  - type: JSONSchema
    url: json-schema/tracetail-io-visitor-schema.json
  - type: JSONSchema
    url: json-schema/tracetail-io-identification-schema.json
  - type: JSONSchema
    url: json-schema/tracetail-io-identification-request-schema.json
  - type: JSONSchema
    url: json-schema/tracetail-io-detailed-identification-schema.json
- aid: tracetail-io:tracetail-io-service-api
  name: tracetail-io Service API
  description: Health and first-party proxy checks.
  humanURL: https://tracetail.io/docs
  baseURL: https://tracetail.io
  tags:
  - Service
  properties:
  - type: OpenAPI
    url: openapi/tracetail-io-service-api-openapi.yml
  - type: JSONSchema
    url: json-schema/tracetail-io-server-identification-schema.json
  - type: JSONSchema
    url: json-schema/tracetail-io-setup-link-schema.json
  - type: JSONSchema
    url: json-schema/tracetail-io-visitor-schema.json
  - type: JSONSchema
    url: json-schema/tracetail-io-identification-schema.json
  - type: JSONSchema
    url: json-schema/tracetail-io-identification-request-schema.json
  - type: JSONSchema
    url: json-schema/tracetail-io-detailed-identification-schema.json
- aid: tracetail-io:tracetail-io-setup-links-api
  name: tracetail-io Setup links API
  description: 'How an AI agent gets API keys for the person it works for: a link they open to sign in and add a card or continue
    without a card.'
  humanURL: https://tracetail.io/docs
  baseURL: https://tracetail.io
  tags:
  - Setup links
  properties:
  - type: OpenAPI
    url: openapi/tracetail-io-setup-links-api-openapi.yml
  - type: JSONSchema
    url: json-schema/tracetail-io-server-identification-schema.json
  - type: JSONSchema
    url: json-schema/tracetail-io-setup-link-schema.json
  - type: JSONSchema
    url: json-schema/tracetail-io-visitor-schema.json
  - type: JSONSchema
    url: json-schema/tracetail-io-identification-schema.json
  - type: JSONSchema
    url: json-schema/tracetail-io-identification-request-schema.json
  - type: JSONSchema
    url: json-schema/tracetail-io-detailed-identification-schema.json
x-enrichment:
  date: '2026-10-31'
  status: enriched
  artifacts_added: 35
  pass: modular-v1
  engine: identity=oss,contract=oss,surfaces=oss,docs=oss,regulatory=oss

tracetail-io API — frequently asked questions

Does tracetail-io have an API?

Yes. APIs.io lists 4 APIs from tracetail-io, including tracetail-io Identification API, tracetail-io Server API and tracetail-io Service API, and 1 more.

Is there an OpenAPI specification for the tracetail-io API?

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

How do I authenticate with the tracetail-io API?

tracetail-io uses bearer-token authentication (3 schemes). The details are profiled on APIs.io as Tracetail Io Authentication.

How much does the tracetail-io API cost?

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

Does tracetail-io have an MCP server?

Yes. APIs.io lists 1 MCP server for tracetail-io: Remote MCP server at tracetail.io.

Is the tracetail-io API ready for AI agents?

tracetail-io has a Kin Score of 61.5 out of 100 (strong) and an Agent Readiness score of 51.3 (agent-ready), scored by API Evangelist on 2026-10-31.

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