Yahoo Finance

finance.yahoo.com · Developer / Data APIs modeIntegrated

Last probed 2026-09-07 17:00 UTC · Provisional

Yahoo Finance — Market data and news; unofficial API and the most-installed finance MCP server.

76 / 100triageInterrupt Score(range 45–95 · 10 properties unassessed)How much automated use this service interrupts — the badge-driving metric. Unassessed properties are provisionally scored at 50%; evidence-graded successes at 25%.

Custody / RiskUnknown

ConfidenceProvisional

Verdict: Partially — an AI agent can use Yahoo Finance, but activate is blocked — SSO-only signup, no API-key path and manage is blocked — SSO-only — no admin API path.

DiscoverEasy
ActivateBlocked
OperateNot yet probedgated by Activate
ManageBlockedgated by Activate

Capability parity

Each stage answers one question about what an agent can do unattended. Stages are ordered by the credential-gateway dependency: Activate issues the keys that unlock Operate and Manage. A row marked “Not yet probed” means no probe has tried that capability yet — a different ledger from the “unassessed” properties under Findings, where no probe tier capable of catching that interrupt has run.

Discover

Can an agent find and read it, no account?

Easy

Be found by a retrieval agentEasy
Retrieval access present.
Evidence
Path tried
robots.txt / sitemap / discovery headers
Where it stalled
completed
Evidence tier
Tier 1 (unauth probe)
Verification
Evidence-only — graded from passive signal, not live-verified.
Backing checks
sitemap_xml
Read what it does and how to use itEasy
Machine-readable docs present.
Evidence
Path tried
llms.txt / AGENTS.md / schema.org / docs
Where it stalled
completed
Evidence tier
Tier 1 (unauth probe)
Verification
Evidence-only — graded from passive signal, not live-verified.
Backing checks
schema_org_jsonld
Read pricing & limits without loginEasy
Public pricing or limits are visible without login.
Evidence
Path tried
homepage links / pricing / plans
Where it stalled
completed
Evidence tier
Tier 0 (passive scan)
Verification
Evidence-only — graded from passive signal, not live-verified.
Backing checks
pricing_public

Activate

Can an agent sign up and walk away with the keys it needs?

Blocked

Assessment incomplete - not yet probed: Obtain a management / admin key.

Create an account self-serveBlocked
SSO-only signup, no API-key path.
SSO-only signup, no API-key issuance blocks this.
Evidence
Path tried
signup flow
Where it stalled
verification step
Evidence tier
Tier 1 (unauth probe)
Verification
Evidence-only — graded from passive signal, not live-verified.
- SSO-only signup, no API-key issuanceSignupSignup offers only OAuth/SSO buttons (Sign in with Google) — no email/password or API-key path.
Obtain an API / MCP access credentialBlocked
SSO-only — no API-key path.
SSO-only signup, no API-key issuance blocks this.
Evidence
- SSO-only signup, no API-key issuanceSignupSignup offers only OAuth/SSO buttons (Sign in with Google) — no email/password or API-key path.
Obtain a management / admin keyNot yet probed
No scoped or administrative key path was confirmed after activation.
Accept the terms without a bot-banEasy
No bot-prohibition signal found.
Evidence
Path tried
ToS / policy scan
Where it stalled
completed
Evidence tier
Tier 0 (passive scan)
Verification
Evidence-only — graded from passive signal, not live-verified.

Operate

Can an agent do the service's actual jobs — call, transact, pay?

Not yet probed

No probe has attempted this stage yet: Call the primary service over MCP / API; Pay via an agent rail (x402 / ACP / AP2).

Gated by Activate — the credential this stage needs isn't issued unattended, so these rows may be unreachable even where they read Easy.

Call the primary service over MCP / APINot yet probed
No machine interface found by passive checks, and no live Tier-2 call attempted.
Gated by Activate — the credential this needs isn't issued unattended.
Complete a transaction / checkoutNot applicable
Integrated tool — the API call is the transaction, no separate checkout.
Gated by Activate — the credential this needs isn't issued unattended.
Pay via an agent rail (x402 / ACP / AP2)Not yet probed
No agent-payment metadata detected - payment rails not yet probed.
Gated by Activate — the credential this needs isn't issued unattended.

Manage

Can an agent administer the account and provision resources?

Blocked

Assessment incomplete - not yet probed: View usage & billing; Cancel / export / delete (offboard).

Gated by Activate — the credential this stage needs isn't issued unattended, so these rows may be unreachable even where they read Easy.

Provision / scale / tear down a serviceBlocked
SSO-only — no admin API path.
SSO-only signup, no API-key issuance blocks this.
Gated by Activate — the credential this needs isn't issued unattended.
Change account details / set budget / rotate keysBlocked
SSO-only — no admin API.
SSO-only signup, no API-key issuance blocks this.
Gated by Activate — the credential this needs isn't issued unattended.
View usage & billingNot yet probed
Authenticated usage and billing access was not confirmed.
Gated by Activate — the credential this needs isn't issued unattended.
Cancel / export / delete (offboard)Not yet probed
No self-serve cancellation, export, or deletion path was confirmed.
Gated by Activate — the credential this needs isn't issued unattended.

Findings

How scoring works →

Interrupt tier: Moderate-Interrupt — derived from 1 finding; interrupt score 76 / 100 — the badge-driving metric. (range 45–95 · 10 unassessed)

Every tool starts at 100. Each interrupt found subtracts a penalty of base weight × timing × hardness × evidence — the multiplier values below come from the same rubric tables the score is computed with. New snapshots also provisionally subtract 50% of the full worst-case tax for each unassessed property and 25% for evidence-graded successes not live-verified by Tier 2.

Property coverage

A check only counts as clean when a probe tier capable of detecting that interrupt actually ran and found nothing. Not tested ≠ clean.

Property	Stage	State	Evidence	Required
SSO-only signup, no API-key issuance	activate	failed	Active finding — itemized in the penalty matrix below. Tier 1 assesses this property.	no
Email OTP verification	activate	unassessed	Tier 1 (unauth probe) ran but did not gather enough evidence to claim clean. Tier 1 assesses this property.	no
SMS / phone OTP verification	activate	unassessed	Tier 1 (unauth probe) ran but did not gather enough evidence to claim clean. Tier 1 assesses this property.	no
Mandatory phone verification call	activate	unassessed	No probe tier that can detect this has run yet — unknown, not clean. Tier 2 assesses this property.	no
Mailed physical code (postal)	activate	unassessed	No probe tier that can detect this has run yet — unknown, not clean. Tier 2 assesses this property.	no
“Contact sales” wall (no self-serve path)	activate	unassessed	No probe tier that can detect this has run yet — unknown, not clean. Tier 2 assesses this property.	no
Manual approval queue	activate	unassessed	No probe tier that can detect this has run yet — unknown, not clean. Tier 2 assesses this property.	no
Rate-limit-triggered manual review	manage	unassessed	No probe tier that can detect this has run yet — unknown, not clean. Tier 2 assesses this property.	no
One-time account / payment-method provisioning	manage	unassessed	No probe tier that can detect this has run yet — unknown, not clean. Tier 2 assesses this property.	no
Identity / KYC verification	activate	unassessed	No probe tier that can detect this has run yet — unknown, not clean. Tier 2 assesses this property.	no
Crypto wallet / key-custody setup	operate	unassessed	No probe tier that can detect this has run yet — unknown, not clean. Tier 2 assesses this property.	no
CAPTCHA / bot-challenge	activate	success	None found — checked at Tier 0 (passive scan) + Tier 1 (unauth probe) (evidence-graded; not yet live-verified by a Tier 2 probe) Tier 0 assesses this property.	no
ToS clause banning automated/bot access	discover	success	None found — checked at Tier 0 (passive scan) (evidence-graded; not yet live-verified by a Tier 2 probe) Tier 0 assesses this property.	no
Mandatory redirect to vendor’s own site	operate	success	None found — checked at Tier 1 (unauth probe) (evidence-graded; not yet live-verified by a Tier 2 probe) Tier 1 assesses this property.	no
No Machine Interface	operate	success	None found — checked at Tier 1 (unauth probe) (evidence-graded; not yet live-verified by a Tier 2 probe) Tier 1 assesses this property.	yes

Interrupt found	Base weight	× Timing	× Hardness	× Evidence	= Penalty
Starting score					100
SSO-only signup, no API-key issuanceSignupSignup offers only OAuth/SSO buttons (Sign in with Google) — no email/password or API-key path.	5	×1one-time setup	×2.5hard	×0.8Tier 1 (unauth probe)inferred	−5
Total penalty					−5
Full unknown tax 108.2 — capped at 25 (point score uses 50% of the capped value)					−108.2
Evidence-graded tax (successes not live-verified by a Tier 2 probe) 138.2 — capped at 25 (point score uses 25% of the capped value)					−138.2
Raw score = 100 − 5 = 95 Point score = 95 − 50% × 25 − 25% × 25 = 76.3 → 76					76

inferred = detected from passive signals, not a directly observed interrupt — penalized at half weight

What would make this Easy

One concrete change per blocker found. These are the diffs between this listing's current parity and an unattended agent path.

Activate / Manage — SSO-only signup, no API-key issuanceExpose an API / MCP credential alongside SSO.

How we scored this

Confidence: Provisional (0.55) — Based on Tier 0/1 evidence only (passive checks, no live transaction attempt) — treat the number as a triage signal, not a verified outcome.
Machine-Readability sub-score: 23 / 100 (a separate integration-ease signal — it never enters the Interrupt Score or badge).
Some capability stages are not yet probed — shown plainly in the spine above, never as a pass.
Rubric, tiers, confidence model, and badge thresholds →

Machine-readability checks 23 / 100

Four check groups, equal weight: machine interfaces, browsing efficiency, element discoverability, and discovery/agent access. Each check carries an evidence grade (proven / plausible / emerging) — an honesty label that never weights the score. What these mean →

llms.txtemergingNot provided
llms-full.txtemergingNot provided
AGENTS.mdemergingNot provided
A2A agent cardemergingNot provided
MCP server (well-known or official registry)plausibleNot provided
OpenAPI/Swagger specplausibleNot provided
Rate-limit headersplausibleNot provided
Structured JSON error responsesplausibleNot provided
OAuth authorization-server metadata (RFC 8414)provenNot provided
API catalog (RFC 9727) (emerging)emergingNot provided
Agent-payment discovery (x402 / UCP) (emerging)emergingNot provided
Lean HTML transfer sizeplausibleNot provided
Manageable DOM sizeplausibleNot provided
High content-to-markup densityplausibleNot provided
Content readable without JS executionprovenraw HTML holds 128% of rendered text (15633 vs 12197 chars; threshold 40%)
Clean-content alternate (RSS/Atom/feed/markdown)plausibleNot provided
Serves markdown on Accept: text/markdownplausibleNot provided
Interactive elements are semanticplausibleNot provided
Form fields have accessible namesplausible4/4 named (100%)
Inputs carry autocomplete hintsplausibleNot provided
WebMCP tools (modelContext API)emergingNot provided
AI retrieval/search fetchers allowed (robots.txt)provenNot provided
Sitemap (indexability)plausibleFound — finance.yahoo.com/sitemap_en-us_quotes_index.xml
schema.org JSON-LD in raw HTMLplausible1 valid JSON-LD block(s) in raw (pre-JS) HTML
Content-Signal directives (robots.txt)emergingNot provided
Web Bot Auth key directory (emerging)emergingNot provided
Discovery Link headers on homepage (emerging)emergingNot provided
Pricing visible without loginFound — finance.yahoo.com/personal-finance/banking/article/best-cd-rates-201308688.html
robots.txt AI-crawler accessplausibleNot provided
Unauthenticated API error is structured JSONplausibleNot provided
Unauthenticated API returns auth guidance (401/403 or documented)plausibleNot provided
API exposes rate-limit headersplausibleNot provided
API key obtainable without human interactionplausibleNot provided

Evidence & history

Last probed 2026-09-07 17:00 UTC. The raw JSON is the archival record.

Date	Score	Badge	Rubric version
2026-09-07 17:00 UTC	76	Moderate-Interrupt (current)	rubric v2026.4
2026-09-07 16:59 UTC	85	Low-Interrupt	rubric v2026.4

Alternatives in Developer / Data APIs

Other Developer / Data APIs tools in the same mode (integrated), ranked by Overall LLM-Friendliness (the mean of Interrupt Score and Machine-Readability) — comparable to this listing because they share its usage mode.

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