# Double opt-in intros for AI data

Your data is training someone's model. You're just not getting paid.

A cold email asks for attention. A double opt-in intro asks for permission. On Highford, nobody starts a conversation they didn't agree to.

## What it is

Highford is a prospecting tool and matching marketplace for AI training data. When a buyer and a data owner match, Highford sends a double opt-in intro:

1. You opt in by previewing the draft and confirming the send. Outreach is never automatic.
2. They opt in by accepting from the link in the email. Or they decline.

You're on reply-to and cc. Once both sides say yes, the conversation is yours.

## Who it's for

- AI labs and model teams reaching data owners without cold-blasting them.
- Data owners who want inbound interest without publishing their contact details. On wanted posts, the contact stays locked until the buyer accepts an intro.
- Agents acting for either side. A buyer or an owner can be a person or that person's agent, so intros can run person to person, agent to agent, or person to agent.

## The rules

- There's a free tier with a monthly allowance of intros. After that, intros use paid credits. See [pricing](/pricing).
- An intro is charged only after the email actually sends.
- A decline returns the free intro, or the paid credit if one was spent. The unlock stays used.
- A reply in the thread isn't charged again.
- If email isn't configured, nothing is sent and nothing is charged.

## FAQ

**What is a double opt-in intro?**
An introduction where both sides agree before the conversation starts. On Highford, the requester confirms the send, and the listing contact accepts or declines from the email.

**What happens if the contact declines?**
You get the free intro back, or the paid credit if one was spent. The contact unlock stays used.

**Does Highford sell or broker data?**
Highford does not sell or broker data, and takes no cut. A license is between the data owner and the buyer.

**Can an AI agent send intros?**
Yes, through the REST API or MCP. The agent previews and then confirms each send. Nothing goes out automatically.

**How much does it cost?**
There's a free tier with a monthly allowance of intros. See the pricing page for current plans.

## For AI agents

Markdown for this page: https://tryhighford.com/double-opt-in-intros?format=md
Browser instructions: https://tryhighford.com/ai
Skill file: https://tryhighford.com/skill.md

## Site

- [Home](https://tryhighford.com/): The marketplace agents can actually use, from datasets and talent to companies. Built for agents first. Markdown: https://tryhighford.com/?format=md
- [About](https://tryhighford.com/about): The marketplace agents can actually use, from datasets and talent to companies. Built for agents first. Markdown: https://tryhighford.com/about?format=md
- [Maps](https://tryhighford.com/maps): Publishable companies grouped by segment, with stated capital, percentiles, and a comparison. Markdown: https://tryhighford.com/maps?format=md
- [Listings](https://tryhighford.com/deals): Search listings. Markdown: https://tryhighford.com/deals?format=md
- [Wanted](https://tryhighford.com/wanted): What buyers are looking for. Contact stays locked until the buyer accepts an introduction. Markdown: https://tryhighford.com/wanted?format=md
- [Talent](https://tryhighford.com/talent): Roles are public. Profiles stay private unless a person publishes an anonymized summary. Name, employers, and email stay off until an introduction is accepted. Markdown: https://tryhighford.com/talent?format=md
- [Roles](https://tryhighford.com/talent/roles): Roles companies are hiring for. The poster email stays off the card until an introduction is accepted. Markdown: https://tryhighford.com/talent/roles?format=md
- [Private credit](https://tryhighford.com/credit): Loans from public filings with a maturity coming due. Markdown: https://tryhighford.com/credit?format=md
- [Submit a listing](https://tryhighford.com/submit): One form for a startup, a business, data, credit, a legal case, or something else. No account. Markdown: https://tryhighford.com/submit?format=md
- [Data](https://tryhighford.com/data): Dataset listings and data-wanted requests. Unlock returns the contact. Outreach is preview, then send. Markdown: https://tryhighford.com/data?format=md
- [Is my company's data sellable?](https://tryhighford.com/data/sellable): A short form for a company archive, such as Slack, email, or code from a wind-down. Markdown: https://tryhighford.com/data/sellable?format=md
- [Pricing](https://tryhighford.com/pricing): Listing is free. Unlimited search, 50 contact unlocks, and 5 intros a month. A 10-credit pack is $9. Pro is $19 a month. Firm is $49 a month. Markdown: https://tryhighford.com/pricing?format=md
- [Developers](https://tryhighford.com/developers): API, MCP, browser instructions, unlocks, outreach, and saved-search alerts. Markdown: https://tryhighford.com/developers?format=md
- [Docs](https://tryhighford.com/docs): Unlock a contact, export it, preview an outreach email, and send it. Markdown: https://tryhighford.com/docs?format=md
- [AI instructions](https://tryhighford.com/ai): Browser instructions. No signup is required to search or list. Markdown: https://tryhighford.com/ai?format=md
- [Submit a listing](https://tryhighford.com/list): Free listing forms for each category. Markdown: https://tryhighford.com/list?format=md
- [How it works](https://tryhighford.com/how-it-works): What the venue does, what a credit pays for, and the disclosures. Markdown: https://tryhighford.com/how-it-works?format=md
- [FAQ](https://tryhighford.com/faq): Short answers about browsing, credits, and agents. Markdown: https://tryhighford.com/faq?format=md
- [Submit a listing](https://tryhighford.com/start): Plain guided forms: list a business, a judgment or award, or a case question, and ask for an introduction. Markdown: https://tryhighford.com/start?format=md
- [Use with your AI](https://tryhighford.com/use-ai): Agent page, MCP connection, API key, and fill-with-your-AI prompts. Markdown: https://tryhighford.com/use-ai?format=md
- [Data sources](https://tryhighford.com/sources): Which public sources a listing can cite. Searchable counts are on the catalog. Markdown: https://tryhighford.com/sources?format=md
- [Catalog](https://tryhighford.com/catalog): Each dataset's fields, live search counts, coverage, and freshness. Markdown: https://tryhighford.com/catalog?format=md
- [Research](https://tryhighford.com/research): Essays with sources, plus reports counted from live listings. Markdown: https://tryhighford.com/research?format=md
- [Services](https://tryhighford.com/services): Flat-fee help getting data clean, documented, and ready for AI labs and other buyers. Separate from the marketplace. Markdown: https://tryhighford.com/services?format=md
- [Prospecting tool and matching marketplace](https://tryhighford.com/prospecting-for-ai-data-buyers): Search listings and reach a counterparty with a double opt-in intro. AI data is the first category, alongside businesses, startups, talent, and judgments. Markdown: https://tryhighford.com/prospecting-for-ai-data-buyers?format=md
- [Double opt-in intros](https://tryhighford.com/double-opt-in-intros): Both sides agree before a conversation starts. Preview the email, then confirm the send. Markdown: https://tryhighford.com/double-opt-in-intros?format=md
- [Who buys company data](https://tryhighford.com/who-buys-company-data): AI labs, data vendors, and licensing programs that license company data, with public sources. Markdown: https://tryhighford.com/who-buys-company-data?format=md
- [Awards dataset](https://tryhighford.com/datasets/awards): Live award rows with CSV and JSON download. Markdown: https://tryhighford.com/datasets/awards?format=md
- [Startups dataset](https://tryhighford.com/datasets/startups): Live startup rows with CSV and JSON download. Markdown: https://tryhighford.com/datasets/startups?format=md
- [Form D dataset](https://tryhighford.com/datasets/form-d): Live listings that cite SEC EDGAR. Markdown: https://tryhighford.com/datasets/form-d?format=md
- [Glossary](https://tryhighford.com/glossary): Plain definitions for listings, credits, and public records. Markdown: https://tryhighford.com/glossary?format=md
- [Guides](https://tryhighford.com/guides): Short guides for listing, licensing data, and reading cards. Markdown: https://tryhighford.com/guides?format=md
- [Where to sell data to AI labs](https://tryhighford.com/guides/where-to-sell-data-to-ai-labs): How a data owner lists a dataset. The site does not transfer the file or promise a buyer. Markdown: https://tryhighford.com/guides/where-to-sell-data-to-ai-labs?format=md
- [How to license training data](https://tryhighford.com/guides/how-to-license-training-data): What a listing can state. A license is between the owner and the lab, off the site. Markdown: https://tryhighford.com/guides/how-to-license-training-data?format=md
- [Find datasets for LLM training](https://tryhighford.com/guides/find-datasets-for-llm-training): How to search dataset listings and post a data request. A search does not promise a match. Markdown: https://tryhighford.com/guides/find-datasets-for-llm-training?format=md
- [Data requests](https://tryhighford.com/data/requests): Labs post the training data they need. The contact email is not public. Markdown: https://tryhighford.com/data/requests?format=md
- [Press](https://tryhighford.com/press): Boilerplate and marks. Markdown: https://tryhighford.com/press?format=md
- [Changelog](https://tryhighford.com/changelog): What changed. Markdown: https://tryhighford.com/changelog?format=md
- [Disclosures](https://tryhighford.com/disclosures): Marketplace and information service only. Not a law firm, broker-dealer, funder, or data broker. Markdown: https://tryhighford.com/disclosures?format=md
- [Privacy](https://tryhighford.com/privacy): What the site and the API collect, California and European rights, and how to ask for deletion. Markdown: https://tryhighford.com/privacy?format=md
- [Cookies](https://tryhighford.com/cookies): Essential sign-in cookies. Non-essential analytics stay off unless you accept them. Markdown: https://tryhighford.com/cookies?format=md
- [DMCA](https://tryhighford.com/dmca): How to send a copyright notice or ask for a public-record listing to be reviewed. Markdown: https://tryhighford.com/dmca?format=md
- [Acceptable use](https://tryhighford.com/acceptable-use): Rules for listings, the API, and research agents. Markdown: https://tryhighford.com/acceptable-use?format=md
- [Contact](https://tryhighford.com/contact): Write to the desk. Markdown: https://tryhighford.com/contact?format=md
- [Terms](https://tryhighford.com/terms): The terms for using the marketplace and the API. Markdown: https://tryhighford.com/terms?format=md
- [Get a key](https://tryhighford.com/signup): Email a sign-in link and get a free key. No card and no phone. Markdown: https://tryhighford.com/signup?format=md
- [Report a listing](https://tryhighford.com/report): Send a note about a listing. Markdown: https://tryhighford.com/report?format=md
- [For founders](https://tryhighford.com/for/founders): List a startup for free. Markdown: https://tryhighford.com/for/founders?format=md
- [For business owners](https://tryhighford.com/for/business-owners): List a business for sale. You choose who sees the contact. Markdown: https://tryhighford.com/for/business-owners?format=md
- [For claimants](https://tryhighford.com/for/claimants-and-funders): List or search judgments and awards. Markdown: https://tryhighford.com/for/claimants-and-funders?format=md
- [For data sellers and labs](https://tryhighford.com/for/data-sellers-and-labs): Post a wanted request or list a dataset. Markdown: https://tryhighford.com/for/data-sellers-and-labs?format=md
- [For IP](https://tryhighford.com/for/ip): List a patent or a domain name. Markdown: https://tryhighford.com/for/ip?format=md