Teller

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.

Teller publishes 4 APIs on the APIs.io network, including Accounts API, Identity API, Institutions API, and 1 more. Tagged areas include Banking, Financial Data, FinTech, Open Banking, and Transactions.

The Teller catalog on APIs.io includes 1 event-driven AsyncAPI specification, 1 JSON-LD context, and 3 Spectral governance rulesets.

Teller’s developer surface includes authentication, documentation, engineering blog, and 10 more developer resources.

🌐 Visit website 📡 Source on GitHub
47.9/100 developing ▼ -5.3 Agent 36/100 agent ready Full breakdown ↓
scored 2026-07-28 · rubric v0.6
AccessFreemiumSelf serve⚡ Free to try
4 APIs
BankingFinancial DataFinTechOpen BankingTransactionsUnified API

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6
Composite quality — 47.9/100 · developing
Contract Quality 18.3 / 25
Developer Ergonomics 9.1 / 20
Commercial Clarity 7.9 / 20
Operational Transparency 4.8 / 13
Governance 5.0 / 12
Discoverability 7.4 / 10
Agent readiness — 36/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
MCP Server 0 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 6 / 6
Agent Skills 0 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
A2A Agent Card 0 / 8
Dry-Run / Simulate Mode 0 / 4
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/teller: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 4

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

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

Open Collections 1

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

Teller API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Teller Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Teller Rate Limits

5 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Teller Finops

FINOPS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Teller Webhooks

AsyncAPI specification describing Teller's outbound webhook surface. Teller sends signed HTTPS POST callbacks to a developer-configured endpoint when notable events occur on enr...

ASYNCAPI

Semantic Vocabularies 1

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

Teller Context

2 classes · 7 properties

JSON-LD

Spectral Rules 3

Spectral governance rulesets for linting and validating these APIs.

Teller API Rules

6 rules · 1 errors 5 warnings

SPECTRAL

Teller API Rules

5 rules · 4 warnings 1 info

SPECTRAL

Teller API Rules

12 rules · 7 errors 5 warnings

SPECTRAL

JSON Schema 2

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

Teller Account

10 properties

JSON SCHEMA

Teller Transaction

10 properties

JSON SCHEMA

JSON Structure 1

JSON Structure definitions describing this provider's data shapes.

Teller Banking Structure

0 properties

JSON STRUCTURE

Examples 3

Example request and response payloads for these APIs.

Teller Get Balances Example

4 fields

EXAMPLE

Teller List Accounts Example

4 fields

EXAMPLE

Teller List Transactions Example

4 fields

EXAMPLE

Security Posture 2

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

Teller Authentication

http · 1 scheme

SECURITY

Teller Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

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

Teller Agentic Access

10 operations · 2 acting

10 operations · 2 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal

Documentation 1

Reference material describing how the API behaves

Documentation
Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess

Build 5

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization
 SDKs
SDKs
 SDKs
SDKs
 SDKs
SDKs
 SDKs
SDKs

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication

Company 3

The organization behind the API

LinkedIn
LinkedIn
 Website
Website
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
aid: teller
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/teller.png
name: Teller
description: 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.
url: https://raw.githubusercontent.com/api-evangelist/teller/refs/heads/main/apis.yml
modified: '2026-05-30'
specificationVersion: '0.19'
tags:
- Banking
- Financial Data
- FinTech
- Open Banking
- Transactions
- Unified API
apis:
- aid: teller:teller-accounts-api
  name: Teller Accounts API
  description: Bank account management
  humanURL: https://teller.io/docs/api
  baseURL: https://api.teller.io
  tags:
  - Accounts
  properties:
  - type: OpenAPI
    url: openapi/teller-accounts-api-openapi.yml
  - type: Documentation
    url: https://teller.io/docs/api
  - type: AsyncAPI
    url: asyncapi/teller-webhooks-asyncapi.yml
  - type: GettingStarted
    url: https://teller.io/docs/guides/quickstart
  - type: Authentication
    url: https://teller.io/docs/api/authentication
  - type: SDKs
    url: https://teller.io/docs/guides/sdks
- aid: teller:teller-identity-api
  name: Teller Identity API
  description: Account holder identity information
  humanURL: https://teller.io/docs/api
  baseURL: https://api.teller.io
  tags:
  - Identity
  properties:
  - type: OpenAPI
    url: openapi/teller-identity-api-openapi.yml
  - type: Documentation
    url: https://teller.io/docs/api
  - type: AsyncAPI
    url: asyncapi/teller-webhooks-asyncapi.yml
  - type: GettingStarted
    url: https://teller.io/docs/guides/quickstart
  - type: Authentication
    url: https://teller.io/docs/api/authentication
  - type: SDKs
    url: https://teller.io/docs/guides/sdks
- aid: teller:teller-institutions-api
  name: Teller Institutions API
  description: Supported financial institutions
  humanURL: https://teller.io/docs/api
  baseURL: https://api.teller.io
  tags:
  - Institutions
  properties:
  - type: OpenAPI
    url: openapi/teller-institutions-api-openapi.yml
  - type: Documentation
    url: https://teller.io/docs/api
  - type: AsyncAPI
    url: asyncapi/teller-webhooks-asyncapi.yml
  - type: GettingStarted
    url: https://teller.io/docs/guides/quickstart
  - type: Authentication
    url: https://teller.io/docs/api/authentication
  - type: SDKs
    url: https://teller.io/docs/guides/sdks
- aid: teller:teller-transactions-api
  name: Teller Transactions API
  description: Account transaction history
  humanURL: https://teller.io/docs/api
  baseURL: https://api.teller.io
  tags:
  - Transactions
  properties:
  - type: OpenAPI
    url: openapi/teller-transactions-api-openapi.yml
  - type: Documentation
    url: https://teller.io/docs/api
  - type: AsyncAPI
    url: asyncapi/teller-webhooks-asyncapi.yml
  - type: GettingStarted
    url: https://teller.io/docs/guides/quickstart
  - type: Authentication
    url: https://teller.io/docs/api/authentication
  - type: SDKs
    url: https://teller.io/docs/guides/sdks
common:
- type: AgenticAccess
  url: agentic-access/teller-agentic-access.yml
- type: DomainSecurity
  url: security/teller-domain-security.yml
- type: Authentication
  url: authentication/teller-authentication.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/hello-teller
- type: Website
  url: https://teller.io/
- type: Documentation
  url: https://teller.io/docs
- type: DeveloperPortal
  url: https://teller.io/docs/api
- type: GitHubOrganization
  url: https://github.com/tellerhq
- type: SDKs
  url: https://github.com/tellerhq/teller-ruby
- type: SDKs
  url: https://github.com/tellerhq/teller-connect-react
- type: SDKs
  url: https://github.com/tellerhq/iOS-SDK
- type: SDKs
  url: https://github.com/tellerhq/teller-connect-android
- type: Blog
  url: https://teller.io/blog
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com