Seamless.AI vs SalesIntel (2026): Data, Pricing and API Compared

Seamless.AI is the bigger database with an MCP server, sold in credits. SalesIntel is the smaller, human-verified one, sold by quote. At 1M records a month, neither tool publishes a price.

Verdict

• Pick Seamless.AI if you want the largest claimed database, mobile numbers at scale and a hosted MCP server. It also has a free license with 50 credits, so you can test before you talk to sales (Seamless.AI credit docs, September 2026).
• Pick SalesIntel if your reps want human-verified contacts, intent data and a success manager in one quoted contract, and you accept an annual term (SalesIntel pricing, September 2026).
• Pick neither if you pull people and company data by API at volume and want one flat monthly bill. LeadOcean is one option, covered below.

Side by side

Both vendors' figures were checked in September 2026. Both change plans and data counts often, so confirm on their pages before you buy.

Data and coverage

Seamless.AI claims far more records, and SalesIntel claims better ones. Seamless.AI lists 2.2B+ verified contacts, 448M+ mobile numbers and 121M+ companies (Seamless.AI API page, September 2026). SalesIntel lists 200M+ verified contacts and 54M+ mobile numbers, AI plus human verified, with a 95% accuracy claim on a 90-day refresh cycle (SalesIntel, September 2026). All of these are vendor claims, and we did not test them.

SalesIntel contradicts its own pages. The homepage says 200M+ verified contacts, and the contacts API page says 120 million machine verified (SalesIntel API page, September 2026). The pages do not explain the gap.

The human-verified split is the real SalesIntel feature. Its people API has a verified parameter that returns only human-verified records, and an is_ev_contact flag for contacts with a verified email (SalesIntel people API, September 2026). Seamless.AI claims verified data across the board, and we found no such tier in its docs.

On filters, Seamless.AI contact search takes 39 filter and modifier parameters and company search 23 (Seamless.AI docs, September 2026). SalesIntel's people API takes company, location, size, revenue, NAICS, SIC, job level and job department. Technology filters need an add-on permission.

Neither tool publishes an email count you can check. Seamless.AI gives a 1.6B+ claim for business emails, and SalesIntel gives none. Run the same 100 lookups in both before you trust a number.

API and developer experience

Seamless.AI gives you an API key and an async flow, and SalesIntel makes you wait for a key. Seamless.AI research is asynchronous: you submit records, then poll or use a webhook. SalesIntel is one synchronous GET, but your success team issues the key. Placeholders below stand in for real people.

Seamless.AI: research a contact by name and company, then poll for the result.

curl -X POST "https://api.seamless.ai/api/client/v1/contacts/research" \
  -H "Content-Type: application/json" \
  -H "Token: $SEAMLESS_API_KEY" \
  -d '{"contacts":[{"contactName":"Jane Doe","companyName":"Acme Corp","title":"CTO"}]}'

Poll GET /contacts/research/poll with the returned requestIds. Terminal statuses are done, error, missing and duplicate (Seamless.AI docs, September 2026). One credit covers a contact's email and phone together. Search costs 1 credit per 10 results returned, rounded up, and polling is free (Seamless.AI docs, September 2026).

SalesIntel: look up one contact by email.

curl --request GET \
  --url "https://api.salesintel.io/service/people?email=jane.doe@acme.com" \
  --header "X-CB-ApiKey: $SALESINTEL_API_KEY" \
  --header "Accept: application/json"

Credits are charged per record returned, not per request. A 402 means you are out of credits and a 403 means your account lacks permission (SalesIntel API docs, September 2026). A /service/people/preview route returns masked contacts and takes no credits.

Rate limits differ in who shares them. Seamless.AI's 60 requests a minute per endpoint are shared by every key and user in the organization. SalesIntel's 1,800 a minute are per user, and heavy overage can bring a cooldown the docs call unpredictable (SalesIntel rate limits, September 2026).

At 1M records, both are fast enough on paper. Seamless.AI is 2,000 search calls and 2,000 research calls at 500 records each. At 60 a minute per endpoint that is about 34 minutes for each, in separate windows, plus polling. SalesIntel is 1,000,000 / 50 = 20,000 page calls, about 11 minutes at 30 a second. But a result set stops at 10,000 records, so you need at least 100 separate searches.

For agents, Seamless.AI is the only one with an MCP server. SalesIntel's developer docs list REST, webhooks and a Snowflake share, and no MCP server. Its terms also bar extracting its materials with crawlers, bots, scripts or intelligent agents, in section 1.5(c) (SalesIntel terms, September 2026). It does not say publicly how that applies to API use, so ask before you wire an agent to it.

Pricing

Neither vendor publishes a dollar price you can multiply. No monthly list price or billed-yearly price is shown by either, so the figures below are credits and seats.

Seamless.AI's pricing page is a quote form. Its credit docs give the allowances. Free has 50 credits with no refill, Basic has 250 a month and Pro has 10,000 a month per license (Seamless.AI credit docs, September 2026). Bulk pool credits are bought at purchase and do not replenish. Subscriptions are annual, and cancelling needs 60 days' notice before renewal (Seamless.AI terms, September 2026).

SalesIntel's pricing page lists unlimited export and enrichment credits per user, a dedicated success manager and add-ons for advanced intent and ads (SalesIntel pricing, September 2026). Vendr reports a median of $17,599 a year, about $1,467 a month, with deals from $8,670 to $41,380 (Vendr, updated February 2026). The terms cap each user at 3,000 companies or contacts revealed a month (SalesIntel terms, September 2026).

At 10,000 records a month

• Seamless.AI: 10,000 contact researches = 10,000 credits, which is one Pro license. If every record first comes from a search, add 10,000 / 10 = 1,000 credits, so 11,000 and two licenses. No public dollar price.
• SalesIntel: no public 10,000 price. At 3,000 reveals per user, 10,000 / 3,000 = 3.3, so at least 4 users. Whether the cap applies to API use is not stated.

At this size both need a quote. Seamless.AI gives you the credit count to quote against, and SalesIntel gives you the seat count.

At 1M records a month

• Seamless.AI: no public 1M price. 1,000,000 researches = 1,000,000 credits, or 1,100,000 with search first. At 10,000 credits per Pro license that is 100 licenses, or a bulk pool, and both are quote only (Seamless.AI docs, September 2026).
• SalesIntel: no public 1M price. At 3,000 reveals per user, 1,000,000 / 3,000 = 334 users. That is a floor on seats, not a quote, and volume deals are negotiated. Vendr reports contact overages of $0.50 to $2.00 per contact (Vendr, February 2026).

Do not multiply any rate out to 1M. Ask both for a written price at your volume, your term length and your renewal increase.

Where Seamless.AI wins

• The larger claimed database: 2.2B+ contacts and 448M+ mobile numbers, against 200M+ and 54M+ for SalesIntel.
• A hosted MCP server with 57 tools, and search tools that use no credits (Seamless.AI MCP docs, September 2026).
• A free license with 50 credits, so you can try the product before a sales call.
• Larger batches: 500 records a search page and 500 per research request, against 50 a page at SalesIntel.
• Up to 25 persistent API keys and 25 OAuth connections per organization.

Where SalesIntel wins

• Human-verified contacts, with a verified parameter in the API that filters to them.
• Intent data in the same contract: 60,000+ intent topics, with advanced intent as an add-on (SalesIntel, September 2026).
• Unlimited export and enrichment credits per user in the app, so reps never count credits.
• A dedicated success manager, onboarding and quarterly reviews on the core plan.
• A free preview endpoint that checks a match before you spend credits, and a Snowflake data share.

If you need volume through an API

LeadOcean is a data API and MCP server with no credits and no seats. It is not a sales suite, and it has no intent data or human-verified tier. Pro costs $499 a month flat, with unlimited searches, enrichments and lookups at 100 requests per second per key. The Free plan gives 1,000 records one-off with no card, and both plans get the same REST API and 12-tool MCP server. POST /v1/exports returns up to 50,000 rows per request (LeadOcean exports docs, September 2026). Compare it on a list you already know, then read Seamless.AI alternatives and pricing.

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