Best data enrichment APIs in 2026

Any field you can describe, filled from the live web

Every API above fills a record with the fields its own dataset keeps. When the field you need is not in that dataset, the call returns nothing for it. SpecStream reads the request your product, agent or team has: the records, the fields to bring back and the conditions each row must meet. Ask for the head of sales and a work email, or for a fact no vendor sells, such as whether a company publishes a sustainability report, and each row is read from that company's own pages.

Bring the list you have: a CSV, Excel file, Google Sheet or Airtable base of up to 20,000 rows. Importing is free. SpecStream matches each row to one identity, shows any namesakes beside their evidence, and fills only the empty cells. Your own values are never overwritten.

One price per row, known before the run

A row costs 5¢ with up to 5 facts, 15¢ with up to 15 facts and one set of related records, and $1 with no limit. An email adds 5¢ and a phone 15¢. So 1,000 companies with 5 facts cost $50, and with a work email for one person at each, $100. The rate is the same on every plan.

The credit APIs price the same job in their own units. On People Data Labs, 1,000 company records are the $100 Company Pro plan. On Coresignal, 1,000 full company records are 20,000 credits, more than the $199 Starter plan holds, so the job needs Pro at $499 a month for 35,000 credits. On SpecStream every request gets a quote of the most it can cost, good for 30 minutes, nothing runs until that maximum is approved, and what the run does not use goes back to your balance.

Each value with the page it was read on

Each value in a SpecStream row carries the URL of the page it was read on and the time it was read. get_find_decisions returns each condition's answer for a row with its reason, the value, the source and the time. A row that a page contradicts is not charged.

Enriched rows stay up to date

Save a request and it reruns hourly to yearly. Each row comes back labeled changed, unchanged or no longer matching. A changed or new row costs half its rate (3¢, 8¢ or 50¢) and an unchanged row costs 1¢, so rechecking 1,000 companies that did not change costs $10. The changes reach HubSpot, Salesforce, Pipedrive, Attio, Sheets, Slack or a signed webhook.

Filings we already hold, and measured search

SpecStream reads public company records every day. In the week of November 9, 2026, 177 operating companies filed a Form D reporting $10.00 billion sold, and each one is a row on specstream.ai/data/form-d.

The same key runs the Search API, the most accurate web search API in the world: 97.9 F-score on all 1,000 official SimpleQA Verified questions (978 correct), and 64.0 item F1 and 43.4 row F1 on all 200 official WideSearch tasks. The Extract API scores 0.908 F1 on WCXB. The scores and the method are on the benchmarks page.

Reverse Contact

A people and company data API with flat monthly plans. Max is $699 a month for unlimited enrichment from an email, a name or a domain, and emails, phones and live refreshes still run on credits. SpecStream has no monthly plan to size: a row costs 5¢, 15¢ or $1 when it is delivered, with any field your request names.

Autobound

A signal data API: enrich costs 2 credits per signal, and packs run from $19 for 1,900 credits to $4,999 for 1,249,750. SpecStream returns the signal as a field on the row, with the page it was read on, and keeps it up to date at 1¢ for a row that did not change.

Clearbit

On Nov 12, 2026, clearbit.com is headed "Clearbit has joined HubSpot!", with a customer login and no price. On SpecStream you import the list you enriched with Clearbit, up to 20,000 rows, and each row is filled in or checked: a match pays its rate and a row that does not match costs 5¢.