# pydantic

pydantic declares [17 subprocessors](https://thirdpartyindex.com/vendors/pydantic#subprocessors) in [its subprocessor list](https://pydantic.dev/legal/cloud-subprocessors), which we last checked on 2026-11-11 ([evidence](https://thirdpartyindex.com/evidence/252330)). They include [Amazon Web Services](https://thirdpartyindex.com/vendors/amazon-web-services), [Google Cloud](https://thirdpartyindex.com/vendors/google-cloud) and [OpenAI](https://thirdpartyindex.com/vendors/openai). No published changes since we first read it on 2026-11-05. [4 tracked vendors](https://thirdpartyindex.com/vendors/pydantic#used-by) name pydantic as a subprocessor, including [Oneleet](https://thirdpartyindex.com/vendors/oneleet), [Firmable](https://thirdpartyindex.com/vendors/firmable) and [Meridian AI](https://thirdpartyindex.com/vendors/meridian-ai).

pydantic (pydantic.dev): subprocessors, data processing agreement, security documents and changes, as monitored by Third Party Index.

- Page: https://thirdpartyindex.com/vendors/pydantic
- Documents last verified: 2026-11-11
- Transparency rating: 89/100 (how much it publishes, not how secure it is): Subprocessor list 30/30; Processing locations 8/8; Purposes 6/7 (partial); Data processing addendum 12/12; Trust center 8/8; Privacy policy 6/6; security.txt 6/6; Security page 5/5; Status page 0/5 (not found); Vulnerability disclosure 0/5 (not found); Pages still reachable 8/8
- Supply chain: relies on 15 tracked vendors directly, 154 within two hops, 489 within three; 4 tracked vendors rely on it directly, 9 within two hops, 48 within three
- Cite as: pydantic, Third Party Index, https://thirdpartyindex.com/vendors/pydantic (data CC BY 4.0)

## Documents

| Document | URL | Last verified | Last changed |
|---|---|---|---|
| Trust center | https://trust.oneleet.com/pydantic?tab=documents | 2026-11-11 | 2026-11-05 |
| Subprocessor list | https://pydantic.dev/legal/cloud-subprocessors | 2026-11-11 | 2026-11-10 |
| Data processing addendum | https://pydantic.dev/legal/data-processing-addendum | 2026-11-11 | 2026-11-10 |
| Privacy policy | https://pydantic.dev/legal/privacy-policy | 2026-11-11 | 2026-11-10 |
| Terms | https://pydantic.dev/legal/terms-of-service | 2026-11-11 | 2026-11-10 |
| Security page | https://pydantic.dev/security | 2026-11-11 | 2026-11-05 |
| security.txt | https://pydantic.dev/.well-known/security.txt | 2026-11-11 | 2026-11-05 |

## Subprocessors (17)

As its own list states them.

| Subprocessor | Purpose | Location | Listed since |
|---|---|---|---|
| [Amazon Web Services](https://thirdpartyindex.com/vendors/amazon-web-services.md) | Cloud hosting and email delivery | US; EU | 2026-11-10 |
| [Anthropic, PBC](https://thirdpartyindex.com/vendors/anthropic.md) (AI model provider: Anthropic) | — | US (storage); global (Gateway inference) | 2026-11-10 |
| [Clay, Inc.](https://thirdpartyindex.com/vendors/clay.md) | Sales enrichment and account management | US | 2026-11-10 |
| [Cloudflare, Inc.](https://thirdpartyindex.com/vendors/cloudflare.md) | Content delivery and traffic routing | US | 2026-11-10 |
| [Customer.io, Inc.](https://thirdpartyindex.com/vendors/customer-io.md) | Marketing and lifecycle emails | EU | 2026-11-10 |
| [Day AI, Inc.](https://thirdpartyindex.com/vendors/day-ai.md) | Customer relationship management and interaction history | US | 2026-11-10 |
| [Devenue Inc. (Reo.Dev)](https://thirdpartyindex.com/vendors/devenue.md) | Developer intent and account intelligence | US (hosting) | 2026-11-10 |
| [Google LLC](https://thirdpartyindex.com/vendors/google-cloud.md) (AI model provider: Google Vertex AI / Gemini) | Email, documents, video conferencing, and AI assistance (Gemini) | US | 2026-11-10 |
| [Google Cloud Platform (Vertex AI)](https://thirdpartyindex.com/vendors/google-cloud.md) (AI model provider: Google Vertex AI / Gemini) | Cloud hosting | US; EU; US, EU (Logfire AI); global (Gateway) | 2026-11-10 |
| [HubSpot, Inc.](https://thirdpartyindex.com/vendors/hubspot.md) | Customer relationship management | EU (hosting); US (additional processing) | 2026-11-10 |
| Metronome Holdings Inc. | Usage-based billing (Gateway enabled) | US | 2026-11-10 |
| [OpenAI](https://thirdpartyindex.com/vendors/openai.md) (AI model provider: OpenAI) | — | US; global (Gateway) | 2026-11-10 |
| [PagerDuty, Inc.](https://thirdpartyindex.com/vendors/pagerduty.md) | Incident management and alerting | EU | 2026-11-10 |
| [PostHog Inc.](https://thirdpartyindex.com/vendors/posthog.md) | Product analytics and submitted sales inquiry contact data | EU | 2026-11-10 |
| [Pylon, Inc.](https://thirdpartyindex.com/vendors/pylon.md) | Customer support | US | 2026-11-10 |
| [Slack Technologies, LLC](https://thirdpartyindex.com/vendors/slack.md) | Messaging and file sharing | US | 2026-11-10 |
| [Stripe, Inc.](https://thirdpartyindex.com/vendors/stripe.md) | Payment processing | US | 2026-11-10 |

Read from ([evidence](https://thirdpartyindex.com/evidence/252330)). CSV: https://thirdpartyindex.com/vendors/pydantic/subprocessors.csv

AI model providers (or a cloud provider's AI model service) among these entries: 4. All vendors that list one: https://thirdpartyindex.com/ai

## Web Technologies

pydantic's homepage made 39 requests to 4 domains, and 1 service controlled by another company. Loaded on 2026-11-05 by a browser that accepted nothing; other visits may load more or less. What a page loads is not a list of who receives customer data.

1 third party by category: Advertising 1 (Google Cloud). Each company that appears controlled by another organization is counted once, under the main category of the technologies detected from it on this homepage or, when none was, the category recorded from the company's own page (marked reviewed) or else the one it is usually detected as on other published homepages (marked as such); unclassified: none of these.

### Third parties (1)

- Google Cloud: 7 requests to google.com, doubleclick.net, googletagmanager.com; DoubleClick Floodlight, Google Analytics, Google Tag Manager (its subprocessor list names it too)

### First party (1)

- pydantic: 32 requests to pydantic.dev; Astro, Cloudflare, HSTS, HTTP/3, Open Graph, PWA, PostHog, Priority Hints, RSS

## Subprocessor of (4)

Tracked vendors whose own subprocessor lists name it, and what they say they use it for.

- [Firmable](https://thirdpartyindex.com/vendors/firmable.md): Logging and Telemetry
- [Meridian AI](https://thirdpartyindex.com/vendors/meridian-ai.md): AI tracing and observability (Logfire); Pydantic Logfire traces Meridian's AI research agent to monitor and debug its behavior. Customer data processed: LLM pro…
- [Oneleet](https://thirdpartyindex.com/vendors/oneleet.md): AI Observability Platform
- [Seekr](https://thirdpartyindex.com/vendors/seekr.md): Data Observability

## Incidents reported by pydantic's subprocessors

Incidents reported in the last 30 days on their own status pages by 8 vendors pydantic lists as subprocessors. A subprocessor list names a company, not the service an incident touched.

- 2026-11-11: [OpenAI](https://thirdpartyindex.com/vendors/openai#status), which pydantic lists as a subprocessor, reported Unable to start new Workspace Agent runs (critical)
- 2026-11-11: [OpenAI](https://thirdpartyindex.com/vendors/openai#status), which pydantic lists as a subprocessor, reported Elevated errors affecting logins, sign-ups, and ChatGPT features (minor)
- 2026-11-11: [Pylon](https://thirdpartyindex.com/vendors/pylon#status), which pydantic lists as a subprocessor, reported Slack Integration Connection Issues (major)
- 2026-11-10: [Anthropic](https://thirdpartyindex.com/vendors/anthropic#status), which pydantic lists as a subprocessor, reported Elevated errors on Fable 52 and Mythos 52 (no impact stated)
- 2026-11-10: [HubSpot](https://thirdpartyindex.com/vendors/hubspot#status), which pydantic lists as a subprocessor, reported Some HubSpot tools may be unavailable for some users (no impact stated)
- 2026-11-10: [OpenAI](https://thirdpartyindex.com/vendors/openai#status), which pydantic lists as a subprocessor, reported Incorrect cost data in Costs API exports (no impact stated)
- 2026-11-09: [OpenAI](https://thirdpartyindex.com/vendors/openai#status), which pydantic lists as a subprocessor, reported Elevated Errors On API (minor)
- 2026-11-09: [OpenAI](https://thirdpartyindex.com/vendors/openai#status), which pydantic lists as a subprocessor, reported Elevated ChatGPT Conversation Errors (minor)
- 2026-11-09: [Day AI](https://thirdpartyindex.com/vendors/day-ai#status), which pydantic lists as a subprocessor, reported Data delays in some parts of the app + MCP (major)
- 2026-11-08: [OpenAI](https://thirdpartyindex.com/vendors/openai#status), which pydantic lists as a subprocessor, reported Elevated errors with image generation (minor)
- 2026-11-08: [Anthropic](https://thirdpartyindex.com/vendors/anthropic#status), which pydantic lists as a subprocessor, reported Degraded performance for Claude Fable 5.1 (minor)
- 2026-11-06: [Customer.io](https://thirdpartyindex.com/vendors/customer-io#status), which pydantic lists as a subprocessor, reported Customers are Unable to add new Email Sending Domains (major)
- 2026-11-06: [OpenAI](https://thirdpartyindex.com/vendors/openai#status), which pydantic lists as a subprocessor, reported Elevated error rates with some U.S. business Mastercards (no impact stated)
- 2026-11-05: [Pylon](https://thirdpartyindex.com/vendors/pylon#status), which pydantic lists as a subprocessor, reported Delay in Analytics Data (minor)
- 2026-11-05: [OpenAI](https://thirdpartyindex.com/vendors/openai#status), which pydantic lists as a subprocessor, reported ChatGPT Work and Dots Errors (minor)
- 2026-11-04: [OpenAI](https://thirdpartyindex.com/vendors/openai#status), which pydantic lists as a subprocessor, reported Elevated error rates across paid ChatGPT plans (minor)
- 2026-11-04: [Pylon](https://thirdpartyindex.com/vendors/pylon#status), which pydantic lists as a subprocessor, reported Inbound Email Delays (minor)
- 2026-11-03: [OpenAI](https://thirdpartyindex.com/vendors/openai#status), which pydantic lists as a subprocessor, reported File upload errors in ChatGPT (minor)
- 2026-11-02: [HubSpot](https://thirdpartyindex.com/vendors/hubspot#status), which pydantic lists as a subprocessor, reported HubSpot is experiencing issues (no impact stated)
- 2026-11-01: [Stripe](https://thirdpartyindex.com/vendors/stripe#status), which pydantic lists as a subprocessor, reported Elevated Instant Payouts failures (no impact stated)
- 2026-10-30: [OpenAI](https://thirdpartyindex.com/vendors/openai#status), which pydantic lists as a subprocessor, reported Elevated errors with search in Dots, ChatGPT Work, and certain ChatGPT thinking experiences (minor)
- 2026-10-30: [OpenAI](https://thirdpartyindex.com/vendors/openai#status), which pydantic lists as a subprocessor, reported Elevated errors for GPT Image 2 API image edits (minor)
- 2026-10-28: [Stripe](https://thirdpartyindex.com/vendors/stripe#status), which pydantic lists as a subprocessor, reported Elevated Issuing errors from 17:13 - 20:41 UTC (minor)
- 2026-10-28: [Anthropic](https://thirdpartyindex.com/vendors/anthropic#status), which pydantic lists as a subprocessor, reported Elevated errors affecting the Google Calendar connector (minor)
- 2026-10-28: [Anthropic](https://thirdpartyindex.com/vendors/anthropic#status), which pydantic lists as a subprocessor, reported Elevated errors affecting the Gmail connector (minor)
- 2026-10-27: [Customer.io](https://thirdpartyindex.com/vendors/customer-io#status), which pydantic lists as a subprocessor, reported Customer.io UI is currently unavailable for some customers (minor)
- 2026-10-27: [Anthropic](https://thirdpartyindex.com/vendors/anthropic#status), which pydantic lists as a subprocessor, reported Elevated errors for Claude Sonnet 5.5 (major)
- 2026-10-27: [OpenAI](https://thirdpartyindex.com/vendors/openai#status), which pydantic lists as a subprocessor, reported 6.1 Sol Degraded Model Performance (minor)
- 2026-10-27: [Anthropic](https://thirdpartyindex.com/vendors/anthropic#status), which pydantic lists as a subprocessor, reported Elevated errors for Claude Sonnet 5.5 (major)
- 2026-10-27: [OpenAI](https://thirdpartyindex.com/vendors/openai#status), which pydantic lists as a subprocessor, reported Elevated error rates for most hosted Code Reviews and Security Reviews on private GitHub repositories (no impact stated)
- 2026-10-26: [OpenAI](https://thirdpartyindex.com/vendors/openai#status), which pydantic lists as a subprocessor, reported Elevated error rates for Ads POST requests (minor)
- 2026-10-25: [Anthropic](https://thirdpartyindex.com/vendors/anthropic#status), which pydantic lists as a subprocessor, reported Elevated errors for Claude Fable 5.1 (major)
- 2026-10-25: [Anthropic](https://thirdpartyindex.com/vendors/anthropic#status), which pydantic lists as a subprocessor, reported Elevated errors for Claude Sonnet 5.5 and other models (major)
- 2026-10-24: [Stripe](https://thirdpartyindex.com/vendors/stripe#status), which pydantic lists as a subprocessor, reported Elevated Blik errors (no impact stated)
- 2026-10-24: [Anthropic](https://thirdpartyindex.com/vendors/anthropic#status), which pydantic lists as a subprocessor, reported Elevated errors for Claude Fable 5 and Claude Fable 5.1 (major)
- 2026-10-24: [Anthropic](https://thirdpartyindex.com/vendors/anthropic#status), which pydantic lists as a subprocessor, reported Elevated errors for Claude Opus 5.5 (major)
- 2026-10-23: [Anthropic](https://thirdpartyindex.com/vendors/anthropic#status), which pydantic lists as a subprocessor, reported Elevated errors for Claude Fable 5.1, Sonnet 5.5, and Haiku 5.5 (critical)
- 2026-10-23: [OpenAI](https://thirdpartyindex.com/vendors/openai#status), which pydantic lists as a subprocessor, reported Degraded experience with ChatGPT app connections using CIMD (minor)
- 2026-10-23: [PagerDuty](https://thirdpartyindex.com/vendors/pagerduty#status), which pydantic lists as a subprocessor, reported Issue Resolved - Delays Across the PagerDuty Platform (major)
- 2026-10-23: [OpenAI](https://thirdpartyindex.com/vendors/openai#status), which pydantic lists as a subprocessor, reported Help Center Chat Support Degraded (no impact stated)
- 2026-10-23: [HubSpot](https://thirdpartyindex.com/vendors/hubspot#status), which pydantic lists as a subprocessor, reported Some HubSpot tools may be unavailable for some users (no impact stated)
- 2026-10-23: [OpenAI](https://thirdpartyindex.com/vendors/openai#status), which pydantic lists as a subprocessor, reported Delays in customer support responses (no impact stated)
- 2026-10-22: [Stripe](https://thirdpartyindex.com/vendors/stripe#status), which pydantic lists as a subprocessor, reported Elevated Bancontact errors (no impact stated)
- 2026-10-22: [OpenAI](https://thirdpartyindex.com/vendors/openai#status), which pydantic lists as a subprocessor, reported New Ad Accounts failing to provision admins (minor)
- 2026-10-22: [OpenAI](https://thirdpartyindex.com/vendors/openai#status), which pydantic lists as a subprocessor, reported Degraded Performance of Dots on Enterprise (minor)
- 2026-10-22: [Stripe](https://thirdpartyindex.com/vendors/stripe#status), which pydantic lists as a subprocessor, reported Elevated Bancontact errors (no impact stated)
- 2026-10-22: [Anthropic](https://thirdpartyindex.com/vendors/anthropic#status), which pydantic lists as a subprocessor, reported Elevated errors affecting Connectors (minor)
- 2026-10-22: [OpenAI](https://thirdpartyindex.com/vendors/openai#status), which pydantic lists as a subprocessor, reported Elevated ChatGPT conversation and Responses API errors (minor)
- 2026-10-22: [HubSpot](https://thirdpartyindex.com/vendors/hubspot#status), which pydantic lists as a subprocessor, reported Update on PHP security vulnerability (no impact stated)
- 2026-10-21: [OpenAI](https://thirdpartyindex.com/vendors/openai#status), which pydantic lists as a subprocessor, reported Authentication errors for some users (major)
- 2026-10-21: [Anthropic](https://thirdpartyindex.com/vendors/anthropic#status), which pydantic lists as a subprocessor, reported Degraded performance for Claude Fable 5 (minor)
- 2026-10-21: [OpenAI](https://thirdpartyindex.com/vendors/openai#status), which pydantic lists as a subprocessor, reported Elevated error rates for gpt-5.6-luna API requests (minor)
- 2026-10-21: [OpenAI](https://thirdpartyindex.com/vendors/openai#status), which pydantic lists as a subprocessor, reported Elevated FedRAMP API error rates for Astra and Sol (minor)
- 2026-10-21: [OpenAI](https://thirdpartyindex.com/vendors/openai#status), which pydantic lists as a subprocessor, reported Degraded performance in ChatGPT, Codex, and APIs (minor)
- 2026-10-20: [Stripe](https://thirdpartyindex.com/vendors/stripe#status), which pydantic lists as a subprocessor, reported Spike in cancellations and expired errors with PayByBank payments (no impact stated)
- 2026-10-20: [Stripe](https://thirdpartyindex.com/vendors/stripe#status), which pydantic lists as a subprocessor, reported Elevated Revolut Pay errors (no impact stated)
- 2026-10-19: [PagerDuty](https://thirdpartyindex.com/vendors/pagerduty#status), which pydantic lists as a subprocessor, reported Issue Resolved - Delays Across the PagerDuty Platform (major)
- 2026-10-19: [OpenAI](https://thirdpartyindex.com/vendors/openai#status), which pydantic lists as a subprocessor, reported File Download errors (minor)
- 2026-10-15: [Stripe](https://thirdpartyindex.com/vendors/stripe#status), which pydantic lists as a subprocessor, reported Elevated declines on Mastercard (no impact stated)
- 2026-10-15: [Stripe](https://thirdpartyindex.com/vendors/stripe#status), which pydantic lists as a subprocessor, reported Elevated declines on Visa (no impact stated)
- 2026-10-15: [OpenAI](https://thirdpartyindex.com/vendors/openai#status), which pydantic lists as a subprocessor, reported Widespread feature degradation (major)
- 2026-10-15: [Stripe](https://thirdpartyindex.com/vendors/stripe#status), which pydantic lists as a subprocessor, reported Elevated Amazon Pay errors (no impact stated)
- 2026-10-14: [Pylon](https://thirdpartyindex.com/vendors/pylon#status), which pydantic lists as a subprocessor, reported Platform loading issues (no impact stated)
- 2026-10-14: [OpenAI](https://thirdpartyindex.com/vendors/openai#status), which pydantic lists as a subprocessor, reported Delayed Costs data in the Compliance API (minor)
- 2026-10-14: [PagerDuty](https://thirdpartyindex.com/vendors/pagerduty#status), which pydantic lists as a subprocessor, reported Postmortem Published - Delayed escalation of incidents and responder request invitations (minor)
- 2026-10-14: [OpenAI](https://thirdpartyindex.com/vendors/openai#status), which pydantic lists as a subprocessor, reported Limited availability on gpt-image-2.5-flare and gpt-image-2.5-sunburst (minor)
- 2026-10-14: [OpenAI](https://thirdpartyindex.com/vendors/openai#status), which pydantic lists as a subprocessor, reported Degraded performance in Codex and ChatGPT Work (minor)
- 2026-10-13: [OpenAI](https://thirdpartyindex.com/vendors/openai#status), which pydantic lists as a subprocessor, reported Degraded performance in GPT-6.1 Sol Codex and Work mode (minor)

The subprocessor list as we read it on any date: https://thirdpartyindex.com/labs/time-machine/pydantic

## Security contact

From its security.txt (https://pydantic.dev/.well-known/security.txt) ([evidence](https://thirdpartyindex.com/evidence/220931)):

- Contact: mailto:security@pydantic.dev
- Disclosure policy: https://pydantic.dev/security
- Languages: en
- Valid until 2027-09-17

---

Third Party Index (https://thirdpartyindex.com) monitors vendors' public security and privacy documents and keeps each version as evidence. Data CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/); vendors' own documents are theirs. API: https://thirdpartyindex.com/api