A B2B data API returns people and company records, such as titles, emails and phones, to your code or agent. Engineers, RevOps teams and agent builders need one when lists are too big to work by hand. Vendors price in credits, seats or quotes, so 1M records a month is hard to compare. Rate limits run from 15 requests a minute to 100 a second. Some MCP servers return records. Some only read docs.
This page ranks six APIs on those points, with list prices checked in September 2026. LeadOcean is first for agent and volume buyers. Each rival has its own comparison: BlitzAPI, FullEnrich, Crustdata, People Data Labs and Coresignal. Also read what a B2B data API is, best B2B data providers with an API and best company data APIs.
TL;DR
| Tool | Best for | Starting price | Cost at 1M records a month |
|---|---|---|---|
| LeadOcean | API, agent and volume buyers | Free (1,000 records, one-off). Pro $499 a month | $499 a month flat. Fair use applies |
| BlitzAPI | Flat-price search and enrichment by API | Core $399 a month | $499 on Plus, inside its 15M results a month limit. The limit and price are for accounts opened by September 30, 2026 |
| FullEnrich | Waterfall emails and mobiles | Pro $29 a month for 500 credits ($26 billed yearly) | No public 1M price. Top monthly tier is 100,000 credits for $3,500 a month |
| Crustdata | Live company and people data for agents | No public price list | No public 1M price. 1M work-email lookups is 2,000,000 credits |
| People Data Labs | Licensed datasets and per-match enrichment | Pro from $98 a month for 350 credits | No public 1M price. Volume above 100,000 records is an Enterprise quote |
| Coresignal | Job postings and raw profile volume | Mini $49 a month for 2,500 credits | No public 1M price. Top plan is $5,000 a month for 10M credits, 500,000 lookups at 20 credits |
"1M records" means 1M work-email lookups that return a result, at list price.
What we evaluated
- API access: which endpoints return people and companies, and whether Free includes them.
- Rate limit: the default per second or minute, and what raises it.
- MCP: whether an agent can search and enrich, or only read docs.
- Price at volume: flat, credits or quote, and the cost of 1M records.
- Data: stated coverage, email and phone fields.
We ran no accuracy test, so we quote no quality numbers.
1. LeadOcean: best for API, agent and volume buyers
LeadOcean holds 693M people, 366M with an email and 166M with a phone number, plus 63M companies. You search with 50 people and 34 company filters. Enrichment is POST /v1/people/enrich, phones are GET /v2/people/phone, and POST /v1/exports returns up to 50,000 rows a request.
Pro is $499 a month, flat, with unlimited searches, enrichments and lookups and 100 requests per second per key. There are no credits. The MCP server at https://api.leadocean.io/mcp signs in with OAuth 2.1 and exposes 12 tools, so an agent can pull records directly.
Pros
- Flat $499 a month at any volume, with no credit meter.
- REST and MCP on every plan, including Free.
- Free counts, and a miss on
POST /v1/people/enrichis a free 404.
Cons
- No table builder, waterfall or rep workspace.
Best for: engineers, RevOps and agents that need volume and a fixed bill.
Pricing: Free is 1,000 records, one-off, no card. Pro is $499 a month, flat (LeadOcean pricing, September 2026).
2. BlitzAPI: best for flat-price search and enrichment by API
BlitzAPI sells people, company, email and phone data on flat monthly plans. It lists 550M+ profiles and 65M+ companies (BlitzAPI docs, September 2026).
Core is $399 a month and leaves out emails and phones. Plus is $499 and adds verified work emails. Full is $599 and adds US phone numbers (BlitzAPI pricing, September 2026). The 50 requests per second and 15,000,000 results a month apply to accounts opened by September 30, 2026. The standard rate is 5 per second (BlitzAPI terms, September 2026).
Pros
- Flat monthly price with a stated 15,000,000 results a month for early accounts.
Cons
- Phones need the top tier and are US only.
- The MCP server gives an agent the docs, not the records (BlitzAPI docs, September 2026).
Best for: teams that run their own code and want a second flat-price API.
Pricing: Core $399, Plus $499, Full $599 a month (BlitzAPI pricing, September 2026).
3. FullEnrich: best for waterfall emails and mobiles
FullEnrich queries 25+ sources per contact, and you pay only for data it finds. Its pricing page lists search across 800M people and 50M companies (FullEnrich pricing, September 2026).
A work email costs 1 credit and a mobile 10 (FullEnrich docs, September 2026). Pro starts at $29 a month for 500 credits, or $26 a month billed yearly. The API allows 60 calls a minute (FullEnrich docs, September 2026).
Pros
- Waterfall across 25+ sources in one call.
- MCP server that can search, enrich and export (FullEnrich help, September 2026).
Cons
- Mobiles cost 10 credits, so phone-heavy pulls add up.
- Above 100,000 credits a month, you contact sales.
Best for: teams that want waterfall emails and mobiles through an API or an agent.
Pricing: Pro from $29 a month for 500 credits. Enterprise custom (FullEnrich pricing, September 2026).
4. Crustdata: best for live company and people data in agents
Crustdata sells real-time company and people data through APIs for search, enrichment, jobs and change watchers. Its homepage claims 1B people (Crustdata, September 2026).
The pricing page shows no plans or dollar prices (Crustdata pricing, September 2026). A work email through /person/enrich is 2 credits (Crustdata docs, September 2026). Defaults are 15 requests a minute on enrich and 30 on search (Crustdata docs, September 2026).
Pros
- Live data and change watchers.
- Hosted MCP server (Crustdata docs, September 2026).
Cons
- No public price per credit, so you cannot price 1M from the site.
- Low default rate limits.
Best for: AI SDR and signal workflows that need fresh data more than raw volume.
Pricing: Credit based, no public price list (Crustdata pricing, September 2026).
5. People Data Labs: best for licensed datasets and per-match enrichment
People Data Labs (PDL) is a long-running person and company data API with bulk licences. It lists ISO and SOC 2 Type 2 compliance (PDL pricing, September 2026).
Pro starts at $98 a month for 350 credits, which is $0.28 each. Volume above 100,000 records goes through Enterprise (PDL docs, September 2026). Enrichment allows 1,000 calls a minute on paid plans (PDL docs, September 2026).
Pros
- Dataset licences for your own warehouse.
Cons
- $0.28 a record at the entry rate.
- No official MCP server in its docs index (PDL docs, September 2026).
- Person Search defaults to 10 requests a minute (PDL docs, September 2026).
Best for: teams that license data or need compliance paperwork.
Pricing: Free up to 100 records a month. Pro from $98 a month for 350 credits (PDL pricing, September 2026).
6. Coresignal: best for job postings and raw profile volume
Coresignal sells employee, company and job records on credits. Its homepage claims 907M+ employee records, 70M+ companies and 482M+ job postings (Coresignal, September 2026).
Plans run from Mini at $49 a month for 2,500 credits to Elite at $5,000 for 10,000,000 (Coresignal pricing, September 2026). A contact enrichment costs 20 credits (Coresignal docs, September 2026). Rate limits rise from 5 requests per second on Starter to 100 on Scale (Coresignal docs, September 2026).
Pros
- 482M+ job postings at 1 credit each.
- MCP server with OAuth 2.1 (Coresignal docs, September 2026).
Cons
- Every record costs credits, and no plan sits above Elite.
- Contact enrichment starts on Pro.
Best for: teams that need job postings or licensed datasets.
Pricing: Mini $49, Starter $199, Pro $499, Growth $1,000 a month and up (Coresignal pricing, September 2026).
Comparison table
| Tool | Best for | Starting price | Cost at 1M records a month | API | MCP | Rate limit |
|---|---|---|---|---|---|---|
| LeadOcean | API, agent and volume buyers | Free. Pro $499 a month | $499 flat. Fair use applies | REST on every plan | Yes. OAuth 2.1, 12 tools | 100 requests per second per key |
| BlitzAPI | Flat-price search by API | Core $399 a month | $499 on Plus, early accounts | REST. Emails from Plus | Docs only | 50 per second for accounts opened by September 30, 2026. Standard 5 |
| FullEnrich | Waterfall emails and mobiles | Pro $29 a month | No public 1M price | REST on every plan | Yes. Search, enrich, export | 60 calls a minute |
| Crustdata | Live data for agents | No public price list | No public 1M price | REST | Yes. OAuth | 15 to 30 a minute by default |
| People Data Labs | Licensed datasets | Pro from $98 a month | No public 1M price | REST, bulk endpoints | None listed in docs index | 1,000 a minute enrichment, 10 search |
| Coresignal | Job postings | Mini $49 a month | No public 1M price | REST, Bulk Collect | Yes. OAuth 2.1, 5 tools | 5 to 100+ per second by plan |
How to choose
- Code, agents or volume: LeadOcean. Flat price, REST and MCP on every plan.
- A second flat-price API: BlitzAPI Plus, if a docs-only MCP server is fine.
- Waterfall emails and mobiles: FullEnrich, at 10 credits per mobile.
- Fresh signals and company events: Crustdata.
- A licence or compliance paperwork: PDL.
- Job postings: Coresignal.
Verdict
LeadOcean wins for API, agent and volume buyers. It has a flat $499 price, emails and phones in one plan, and an MCP server that returns records. BlitzAPI is the flat-price runner-up if you run your own code. FullEnrich wins for waterfall mobiles, Crustdata for live signals, PDL for licensed datasets and Coresignal for job postings. Start on the free plan and compare the same lookups.
FAQ
What is the best B2B data API?
For code, agents and volume, LeadOcean has the flat price and an MCP server that returns records. For waterfall mobiles, FullEnrich. For job postings, Coresignal.
What is the cheapest B2B data API at 1M records a month?
On list price, LeadOcean at $499 flat and BlitzAPI Plus at $499 for early accounts. The other four publish no plan at 1M, so ask each for a quote.
Which B2B data APIs have an MCP server that returns data?
LeadOcean, FullEnrich, Crustdata and Coresignal do. BlitzAPI's server reads documentation only. We found no official PDL server.
How do credits differ from a flat price?
Credits bill per action, so a mobile can cost 10 times an email. A flat price is one fee at any volume.
Do I need a credit card to try LeadOcean?
No. The free plan needs a work email and no card. It gives you 1,000 records, one-off, with the same API and MCP server as Pro.
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