# tracetail-io

**Canonical:** https://apis.io/providers/tracetail-io/  
**Website:** https://tracetail.io/  
**APIs profiled:** 1

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.

## Kin Score — 61.5 / 100 (strong)

Scored 2026-10-31 under rubric 0.25.0.

| Facet | Score |
|---|---|
| Discoverability | 65.0 |
| Contract Quality | 62.7 |
| Contract Governance | 79.1 |
| Operational Transparency | 45.3 |
| Developer Ergonomics | 37.4 |
| Access Clarity | 63.7 |

Regulatory layer — **Horizontal (data, software, accessibility, platform)**: 40.2 (matched via fallback).

## Agent readiness — 51.3 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | unknown |
| Reversibility Documented | no |
| MCP Server | documented |
| Auth Clarity | bearer |
| Idempotency | documented |
| Error Semantics | verified |
| OpenAPI Examples | verified |
| Rate Limit Signal | verified |
| Event Surface Described | no |
| Agent Skills | unknown |
| Well Known Catalog | yes |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |
| Pagination Ratio | na |
| Operation Distinctiveness | distinct |

## APIs (4)

- **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)

- **tracetail-io MCP Server** — Remote MCP server at tracetail.io.

## Agentic access (1)

- **Tracetail Io Agentic Access** — 8 operations · 3 acting

## Security (3)

- **Tracetail Io Authentication** — 3 schemes
- **Tracetail Io Domain Security** — TLSv1.3 · HSTS · DNSSEC · DMARC
- **Tracetail Io Vulnerability Disclosure** — security.txt · contact published

## Plans (1)

- **Tracetail Io Plans Pricing**

## Tags

Browser Fingerprinting, Privacy, Analytics, API, Device Identification

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/tracetail-io/). Scores are computed from the provider's own public artifacts under a published rubric.