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 API contracts indexed 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 14 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

37.7/100 thin ▬ flat Agent 20/100 agent aware Front door AI 1/6 silent Heartbeat 0/100 dormant Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract

Banking Financial Data Fintech Open Banking Transaction Unified API

What this lets a business do 2

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Deposits & Savings Management

BC-1330

Accounts

GET /accounts GET /accounts/{account_id} GET /accounts/{account_id}/balances

Banking Customer Management

BC-1300

Identity

GET /identity

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 37.7/100 · thin

Contract Quality 12.9 / 21

Developer Ergonomics 10.5 / 17

Access Clarity 1.3 / 17

Operational Transparency 1.2 / 11

Contract Governance 1.4 / 10

Discoverability 5.6 / 9

Regulatory Posture 2.0 / 15

Agent readiness — 20/100 · 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

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 0 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

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.

Create-or-Update Ergonomics does not apply to this provider. The published contracts declare no write operations, and a read-only API cannot create-or-update. The facet is excluded from this provider's denominator entirely — not scored zero. A reference or data API is not deficient for being unable to upsert.

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/.

Show this score on your site.

It updates itself when the score changes. Paste this where you link to your API docs:

<a href="https://apis.io/providers/teller/"><img src="https://apis.io/badge/teller/card.svg" alt="Teller on APIs.io — Kin Score by API Evangelist"></a>

Other styles, a README pill and a shields.io endpoint are on the badge page.

Raise your score.

Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document

9 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Access Clarity scores 7.9 — up to +18.4 composite points
Operational Transparency scores 10.5 — up to +11.6 composite points
Contract Governance scores 13.6 — up to +10.4 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/teller/apis.yml: open an issue on github.com/api-evangelist/teller to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

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 5

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

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

Teller API pricing

Not yet checked against Teller's own pricing page. Compiled by API Evangelist on 2026-05-04; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free freemium	Free
Professional paid	Free
Enterprise enterprise	—

Plan details, limits and sources →

Rate limits

Free Tier Default: 10 requests per minute
Free Tier Monthly Quota: 1000 requests per month
Professional Tier Default: 100 requests per minute

Compiled by API Evangelist, not yet checked against Teller's documentation. All 5 limits →

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

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

Teller

SLA

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 — asyncapi rules

6 rules · 1 errors 5 warnings

SPECTRAL

Teller — jsonschema 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

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

SDKs

SDKs

SDKs

SDKs

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Source (apis.yml)

aid: teller
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: true
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - openapi
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-06'
  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
- 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: Plans
  url: plans/teller-plans-pricing.yml
- type: RateLimits
  url: rate-limits/teller-rate-limits.yml
- type: FinOps
  url: finops/teller-finops.yml
- type: CapabilityMap
  url: capabilities/teller-capability-edges.yml
  name: Teller Business Capability Map
- 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

Teller API — frequently asked questions

Does Teller have an API?

Yes. APIs.io lists 4 APIs from Teller, including Teller Accounts API, Teller Identity API and Teller Institutions API, and 1 more.

Is there an OpenAPI specification for the Teller API?

Yes. APIs.io indexes 4 OpenAPI specifications for Teller, each linked for download from this page.

How do I authenticate with the Teller API?

Teller uses bearer-token authentication (http · 1 scheme). The details are profiled on APIs.io as Teller Authentication.

How much does the Teller API cost?

APIs.io lists 3 pricing plans for Teller, with each plan's price, limits and inclusions under Pricing on this page.

Is the Teller API ready for AI agents?

Teller has a Kin Score of 37.7 out of 100 (thin) and an Agent Readiness score of 20.0 (agent-aware), scored by API Evangelist on 2026-11-06.

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/teller"

All providers

curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/teller/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/teller/evidence"

Calls without X-API-Key need no key. Calls with it need a paid plan — get a key.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.