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

Seamless.AI and LeadMagic both sell B2B contact data by the credit, but they sell it to different people. Seamless.AI is a sales app with an API bolted on and no public price. LeadMagic is an API first and prints every plan.

Verdict

• Pick Seamless.AI if phones matter most and your reps want a prospecting app. One credit covers a contact's email and phone together, and it claims 448M+ verified mobiles. You get the price from sales.
• Pick LeadMagic if you want a price you can read before you talk to anyone. Plans start at $99 a month, failed lookups are free, and the email finder answers in one synchronous call.
• Pick neither if you need volume through an API at a price you can read. Seamless.AI and LeadMagic both publish no price at 1M records. LeadOcean is one option: Pro is $499 a month, flat.

Side by side

Data and coverage

Seamless.AI claims far more data. It lists 2.2B+ verified contacts and 121M+ companies, against LeadMagic's 400M+ profiles and 25M+ companies. Both are the vendors' own numbers, and a bigger claim is not a better match rate on your list.

Only Seamless.AI publishes email and phone totals. It claims 1.6B+ verified business emails and 448M+ verified mobiles (Seamless.AI, September 2026). LeadMagic prints no coverage count for either, so you cannot compare them on paper.

Phones are where the pricing differs most. At Seamless.AI one credit covers a contact's email and phone together (Seamless.AI docs, September 2026). At LeadMagic an email is 1 credit and a mobile is 5, so a person with both costs 6 (LeadMagic pricing explained, September 2026).

The products also differ beyond the data. LeadMagic adds 46M+ job posts and a job change check at 3 credits a request. Seamless.AI sells a Chrome extension, a dialer and buyer intent next to the contact data (Seamless.AI, September 2026).

Test on your own list before you buy. Seamless.AI Free gives 50 credits once, and LeadMagic has no free plan, only a 14-day money-back guarantee on the first payment (LeadMagic help, September 2026). Run the same 30 people through each and compare match rate and email status.

API and developer experience

Both are REST APIs with a hosted MCP server. The difference is the flow. LeadMagic answers an email lookup in the response. Seamless.AI makes you submit a research job and poll for it.

LeadMagic takes the key in an X-API-Key header. The email finder is POST /v1/people/email-finder, and it takes a name plus a domain (LeadMagic docs, September 2026):

curl -X POST 'https://api.leadmagic.io/v1/people/email-finder' \
  -H "X-API-Key: $LEADMAGIC_API_KEY" \
  -H 'Content-Type: application/json' \
  -d '{"first_name":"Jane","last_name":"Doe","domain":"acme.com"}'

It returns the address, a status of valid or null, and credits_consumed. A valid email is 1 credit. A miss is free.

Seamless.AI takes the key in a Token header. You start a research job and get an HTTP 202 with requestIds (Seamless.AI docs, September 2026):

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"}]}'

Next you call GET /contacts/research/poll with those requestIds, or take the result by webhook. The docs do not say whether a missing record is charged, and they give no completion time for a job.

Rate limits point in opposite directions. Seamless.AI allows 60 requests a minute per endpoint for the whole organization, but one research request takes up to 500 records. LeadMagic's email finder allows 600 requests a minute, but each call is one person (LeadMagic docs, September 2026).

Search is billed differently too. Seamless.AI charges 1 credit per 10 results returned (Seamless.AI docs, September 2026). LeadMagic search is free in the app on every paid plan. Through the API it is zero-credit only on Professional and Ultimate, and about 1 credit per returned person on Essential and Growth (LeadMagic People Search docs, September 2026). The pricing page says 1 credit per request (LeadMagic pricing, September 2026), so confirm before you build on it.

On MCP, Seamless.AI offers 57 tools and accepts an API key or OAuth. Its search tools use no credits and its research tools do. LeadMagic's signs in by OAuth only and accepts no static key (Seamless.AI MCP docs; LeadMagic MCP page, September 2026).

Pricing

LeadMagic prints four plans in dollars. Seamless.AI prints credits and no dollars. Credits are the only unit you can compare across the two, and one credit buys about the same thing: one contact.

At 10,000 records a month

For LeadMagic, take 10,000 valid work emails. That is 10,000 credits. Essential's 5,000 is too few, so Growth is the fit: $249 a month for 20,000 credits, or $2,490 billed yearly, which is $208 a month (LeadMagic pricing, September 2026). Misses are free, so this is the ceiling.

Add mobiles and the sum moves. If all 10,000 contacts return a mobile, that is 10,000 x 5 = 50,000 credits. Professional covers it at $499 a month, or $416 a month billed yearly.

For Seamless.AI, 10,000 contacts is 10,000 credits, with email and phone included. A Pro license carries 10,000 credits a month, so that is one license. If each record first comes from a search at 1 credit per 10 results, add 1,000 credits and you need two licenses (Seamless.AI credit docs, September 2026). Seamless.AI publishes no license price, so there is no dollar figure here.

At 1M records a month

Neither vendor has a public 1M price. We do not multiply a rate out to 1M and call it a price.

For LeadMagic, 1,000,000 valid emails is 1,000,000 credits. The biggest self-serve plan, Ultimate, carries 100,000 credits a month, so this is ten times anything on the page. Top-up prices are not published. Enterprise starts at $2,490 a quarter paid upfront and lists no per-credit price (LeadMagic pricing, September 2026).

Time is a second limit. At 600 requests a minute, 1,000,000 lookups is about 1,667 minutes, or 28 hours. App exports are capped at 100,000 rows a day on Ultimate, so a 1M-row export takes 10 days.

For Seamless.AI, the same pull is 1,000,000 research credits, or 1,100,000 with a search first. At 10,000 credits per Pro license that is 100 licenses, or 110 with search, or a bulk pool. Both are quote only (Seamless.AI docs, September 2026).

Request time is shorter than you would guess. At 500 records a call and 60 calls a minute, 1M records is 2,000 research calls, about 34 minutes of request windows. Search pages run in a separate window, and job completion time is not documented.

Where Seamless.AI wins

• Phones. One credit covers email and phone together. At LeadMagic the same person costs 6 credits.
• A bigger claimed dataset. 2.2B+ contacts and 448M+ mobiles, against 400M+ profiles.
• Published coverage counts. It states email and mobile totals. LeadMagic does not.
• Bigger batches. 500 records per research request and 500 per search page. LeadMagic search returns 50 rows a page, or 25 on the zero-credit lane (LeadMagic agent guide, September 2026).
• A free license and a rep app. 50 credits to test with, plus an extension and dialer. LeadMagic has neither.

Where LeadMagic wins

• A price you can read. Four plans, from $99 a month, with the credit rate printed on each.
• Pay on success. A failed email lookup is free, and an email costs 1 credit.
• Synchronous email lookups. One call, one answer. No job to poll.
• Higher request limits. 600 email lookups a minute, against 60 a minute at Seamless.AI.
• Easier exit. Seamless.AI subscriptions are annual and need 60 days' notice before renewal (Seamless.AI terms, September 2026). LeadMagic bills monthly and has a 14-day money-back guarantee on the first payment.

If you need volume through an API

We build LeadOcean, so weigh this section accordingly. It holds 693M people and 63M companies, reachable over REST and an MCP server with 12 tools. Free is 1,000 records, one-off, with no card. Pro is $499 a month, flat, with no credits and a limit of 100 requests per second per key (LeadOcean pricing, September 2026).

For bulk work, POST /v1/exports returns up to 50,000 rows per request. The app has an Exports page with a filter builder and CSV download (LeadOcean exports docs, September 2026). There is no sequencer, dialer or Chrome extension. If your reps live in Seamless.AI, or you need job posts, keep the tool you have.

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