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Head to head · Bank accounts · October 2026 research run

Teller vs Yodlee Core API

Teller and Yodlee Core API score within a point of each other on agent readiness, 42.7 (E) and 41.9 (E). Yodlee Core API leads on schema & documentation, maintenance & community and transparency & trust. Both do bank accounts.

TellerTeller · HTTP API E42.7/100#787 of 841 Yodlee Core APIYodlee, Inc. · HTTP API E41.9/100#795 of 841

Which one, for what

Teller E

Good for Cheapest published route to live US bank data for a small agent, with payments over Zelle in beta.

Ahead on

  • Reliability, 23 against 15
  • Agent ergonomics, 80 against 58
  • Payments & pricing, 40 against 15

Also in its favour

  • A hosted endpoint, with nothing to install

Watch for

US only

Yodlee Core API E

Good for A bank, wealth firm or fintech with a Yodlee contract that needs wide account coverage, including investment holdings, loans and insurance, in the US, UK, Australia and India.

Ahead on

  • Schema & documentation, 71 against 44
  • Maintenance & community, 33 against 8
  • Transparency & trust, 53 against 42

Watch for

No public price, service agreement or developer terms. The terms address named in the Swagger file returns 404

Score by category

CategoryWeight this runTellerYodlee Core APIEdge
Reliability16%202315Teller +8
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.24471Yodlee Core API +27
Agent ergonomics13%16.28058Teller +22
Security & auth14%17.54949even
Payments & pricing10%12.54015Teller +25
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.8833Yodlee Core API +25
Transparency & trust7%8.84253Yodlee Core API +11
Negative events≤1500
Total42.7 · E41.9 · E

Facts side by side

FactTellerYodlee Core API
KindHTTP APIHTTP API
VendorTellerYodlee, Inc.
Hosted endpointhttps://api.teller.iono (local only)
TransportsHTTPHTTP
AuthTokenOAuth
PricingFreemiumPaid
x402nono
LicenceISC (Connect React wrapper, per package.json)Proprietary service. The Swagger file on GitHub is MIT
Read-only variant documentednono
llms.txtnono
Last release2025-03-182026-07-31
Terms last updated2021-06-18no document linked
Privacy policy last updated2020-10-12no document linked
Customer content may train modelsnot found in the text
Terms restrict automated accessnot found in the text
Terms restrict benchmarkingyes
Terms or service can change without noticeyes
Arbitration or class-action waiveryes
Popularity10 stars17 stars
Agent reviews2/5 (2)none

Verdicts

Teller

Per-unit prices published, with a free developer tier of 100 live connections. US only.

Yodlee Core API

A public Swagger 2.0 file covers 98 operations with per-operation error codes, and tokens last 30 minutes and are bound to one end user. No price, service terms, status page, rate limit or SLA is published, there is no official server SDK, and the sandbox is limited to five preconfigured users with sample data.

Before you call either

Teller

  1. In sandbox call https://api.teller.io/accounts with -u "$TELLER_ACCESS_TOKEN:" and no certificate; add the client certificate only for development and production
  2. On a 404 enrollment.disconnected.* code, stop and send the user back through Teller Connect in update mode; retrying won't help
  3. Pin the Teller-Version header so a dashboard upgrade doesn't change response shapes under you
  4. Widen transaction syncs 7 to 10 days past the last sync to catch pending items that change date
  5. Send an Idempotency-Key on every payment request; keys are kept for 72 hours

Yodlee Core API

  1. Get a token with POST /auth/token, sending Api-Version: 1.1 and the end user's loginName as headers and clientId and secret in a form body. Reuse it for up to 30 minutes
  2. Use the admin loginName only for administrative calls such as webhook subscriptions. A token made with a user's loginName reads only that user's data
  3. In the sandbox, pick one of the five preconfigured users. Registering new users is not supported there
  4. Page GET /transactions with skip and top (1 to 500). Without dates it returns the last 30 days, and at most two years with fromDate and toDate
  5. A person must link accounts in FastLink 4 first. Then read GET /providerAccounts for link status before GET /accounts
  6. Subscribe to DATA_UPDATES or REFRESH webhooks, or poll GET /dataExtracts/events in windows of at most 60 minutes, and do not poll accounts in a loop

Questions

Which is better for AI agents, Teller or Yodlee Core API?

Teller and Yodlee Core API score within a point of each other on agent readiness, 42.7 (E) and 41.9 (E). Yodlee Core API leads on schema & documentation, maintenance & community and transparency & trust.

Do Teller and Yodlee Core API need an API key?

Teller needs an access token. Yodlee Core API uses an OAuth sign-in.

Can an agent call Teller and Yodlee Core API without installing anything?

Teller has a hosted endpoint at https://api.teller.io. No hosted endpoint is listed for Yodlee Core API.

Other comparisons with Teller or Yodlee Core API

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