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 Transaction.

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
39.1/100 thin ▬ flat Agent 30/100 agent aware Full breakdown ↓
scored 2026-08-20 · rubric v0.12.0
AccessFreemiumSelf serve⚡ Free to try
4 APIs
BankingFinancial DataFintechOpen BankingTransactionUnified-API

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-20 · rubric v0.12.0
Composite quality — 39.1/100 · thin
Contract Quality 14.7 / 21
Developer Ergonomics 8.5 / 17
Access Clarity 2.7 / 17
Operational Transparency 1.2 / 11
Contract Governance 1.2 / 10
Discoverability 6.3 / 9
Regulatory Posture 3.2 / 15
Agent readiness — 30/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
Documented Reversibility 0 / 6
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
Regulatory Posture applies to this provider. Its tags matched the Banking & Open Finance 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.
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/.
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 6

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

API Collection

OPEN COLLECTION

Teller Accounts API

OPEN COLLECTION

Teller Accounts Identity API

OPEN COLLECTION

Teller Accounts Institutions API

OPEN COLLECTION

Teller Accounts Transactions API

OPEN COLLECTION

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: '0.23'
tags:
- Banking
- Financial Data
- Fintech
- Open Banking
- Transaction
- Unified-API
tags_raw:
- 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:
  - Account
  tags_raw:
  - 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
  tags_raw:
  - 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:
  - Transaction
  tags_raw:
  - 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