# Teller

**Canonical:** https://apis.io/providers/teller/  
**Website:** https://teller.io/  
**APIs profiled:** 4

Teller is a unified banking API providing real-time access to bank accounts, transactions, balances, identity data, and payment initiation across US financial institutions. Connect to thousands of banks and credit unions through a single integration. Teller uses mutual TLS (mTLS) for application authentication and access tokens obtained via Teller Connect for per-account authorization.

## Kin Score — 39.1 / 100 (thin)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 39.1).

| Facet | Score |
|---|---|
| Discoverability | 74.1 |
| Contract Quality | 69.1 |
| Governance | 11.4 |
| Contract Governance | 11.4 |
| Operational Transparency | 10.5 |
| Developer Ergonomics | 50.0 |
| Commercial Clarity | 15.8 |
| Access Clarity | 15.8 |

Regulatory layer — **Banking & Open Finance**: 21.5 (matched via tags).

## Agent readiness — 30.3 (agent-aware)

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

## Access

Freemium · Self-serve signup — onboarding: self-serve, pricing: freemium, trial: no (confidence: high).

## APIs (4)

- **Teller Accounts API** — Bank account management
- **Teller Identity API** — Account holder identity information
- **Teller Institutions API** — Supported financial institutions
- **Teller Transactions API** — Account transaction history

## Agentic access (1)

- **Teller Agentic Access** — 10 operations · 2 acting

## Security (2)

- **Teller Authentication** — http · 1 scheme
- **Teller Domain Security** — TLSv1.3 · HSTS · DMARC

## Plans (1)

- **Teller Plans Pricing**

## Tags

Banking, Financial Data, Fintech, Open Banking, Transaction, Unified-API

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