# Tether

**Canonical:** https://apis.io/providers/tether/  
**Website:** https://tether.io/  
**APIs profiled:** 5

Tether Operations Limited is the issuer of USD₮ (USDT), the largest stablecoin by circulating supply, along with XAU₮ (gold-backed), USA₮ and EUR₮ tokens issued across Ethereum, Tron, TON, Solana, Bitcoin/Liquid, Avalanche, Polygon, Arbitrum, Plasma and other chains. Beyond token issuance, Tether ships a developer surface centred on the open-source Wallet Development Kit (WDK) — a modular, self-custodial multi-chain wallet framework distributed as @tetherto/* npm packages, a WDK CLI, a React Native UI kit, an MCP Toolkit that exposes 35 wallet, pricing, indexer, swap, bridge, lending and fiat tools to AI agents, a published Agent Skill, and the hosted WDK Indexer REST API (wdk-api.tether.io) for token balances and transfer history. Tether also operates the QVAC local-AI SDK, the Tether Wallet app, and a public bug-bounty program.

## Kin Score — 54.0 / 100 (developing)

Scored 2026-08-17 under rubric 0.11.0. Trend: flat (+0.0 from 54.0).

| Facet | Score |
|---|---|
| Discoverability | 92.6 |
| Contract Quality | 47.8 |
| Governance | 11.5 |
| Operational Transparency | 63.2 |
| Developer Ergonomics | 87.0 |
| Commercial Clarity | 34.2 |

Regulatory layer — **Payments**: 48.4 (matched via tags).

## Agent readiness — 54.1 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | no |
| MCP Server | yes |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | documented |
| OpenAPI Examples | partial |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | yes |
| Well Known Catalog | yes |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## APIs (5)

- **Tether API Keys API** — The API Keys API from Tether — 2 operation(s) for api keys.
- **Tether Chains API** — Supported blockchains and token discovery
- **Tether Health API** — Server health and status checks
- **Tether Token Balances API** — Query current token balances for addresses
- **Tether Token Transfers API** — Query token transfer history for addresses

## MCP servers (1)

- **tether-mcp.yml**

## Security (3)

- **Tether Authentication** — apiKey · 1 scheme
- **Tether Domain Security** — TLSv1.3 · HSTS · DMARC
- **Tether Vulnerability Disclosure** — Hackerone · security.txt

## Tags

Company, Stablecoins, Cryptocurrency, Blockchain, Wallets, Digital Assets, Payments, Self-Custody, Multi-Chain, Agents, MCP, Open Source

---

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