An unlimited B2B data provider sells contact and company records without a per-record meter, so volume does not move the bill. It suits teams that pull data through an API, an agent or an export job. The catch is the word "unlimited". ContactOut caps paid plans at 2,000 emails per account a month (ContactOut terms, September 2026). Kaspr's unlimited emails sit behind 30,000 exports a year on Business (Kaspr pricing, September 2026). Wiza's unlimited reveals need an annual plan (Wiza pricing, September 2026).
This page ranks six providers and names the ceiling behind each. Two publish a plan that covers 1M records a month. The rest need a sales call or a seat count. For two-column views, see BlitzAPI, Wiza, ContactOut, Lead411 and Kaspr. The wider list is in best unlimited B2B data providers.
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 |
| Wiza | Reps prospecting from LinkedIn | Unlimited email reveals from $83 a month per user, billed yearly ($990 a year) | No public 1M price. Exports stop at 2,500 a month per seat |
| ContactOut | Browser-first email and phone finding | Email $49 a month ($39 billed yearly) | No public 1M price. Fair use is 2,000 emails per account a month |
| Lead411 | Annual contracts with unlimited exports | Spark $49 a month ($490 a year) | No public 1M price. Unlimited exports are on Blaze, by quote |
| Kaspr | Phones and emails from LinkedIn profiles | Starter $65 per user a month | No public 1M price. Business stops at 30,000 exports a year |
"1M records" means 1M work-email lookups that return a result, at list price. Where no public plan sells that volume, we state no price.
What we evaluated
- What unlimited covers: searches, reveals, phones or exports.
- The ceiling: fair-use caps, export caps, rate limits and seats.
- API and MCP: the plan that opens them, and whether an agent gets records.
- Price model: flat, per seat or credits, and the price at 1M records.
- Data: phone fields and search filters.
We read each vendor's pricing page and docs in September 2026.
1. LeadOcean: best for API, agent and volume buyers
LeadOcean is one dataset behind one REST API and one MCP server. It holds 693M people, 366M with an email and 166M with a phone, and 63M companies. The MCP server has 12 tools (LeadOcean MCP docs, September 2026).
Pro is $499 a month with unlimited searches, enrichments and lookups and 100 requests per second per key. There are no credits and no overage invoice. Phones are GET /v2/people/phone.
Pros
- Flat $499 a month at any volume.
- REST and MCP on every plan, Free included.
- Free counts, and a miss on enrichment costs nothing.
Cons
- Past the fair-usage line, a very large month is paced to one request a minute.
- Exports stop at 500,000 rows a day (LeadOcean exports docs, September 2026).
- No rep workspace, sequencer, dialer, CRM or Chrome extension.
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 B2B data by API on flat plans. Its docs name the tiers Unlimited Leads, Unlimited Email and Unlimited Phone Numbers (BlitzAPI docs, September 2026).
Accounts opened by September 30, 2026 get 50 requests per second and up to 15,000,000 results a month. The standard rate is 5 per second, and later plans are not priced in public (BlitzAPI terms, September 2026).
Pros
- Flat $499 on Plus covers 1M work-email results.
- A call that finds nothing counts nothing.
- A free trial of 1,000 credits, no card.
Cons
- Phones are US only and need the Full tier.
- The MCP server gives an assistant the API docs, not records (BlitzAPI docs, September 2026).
Best for: teams that run their own code.
Pricing: Core $399, Plus $499, Full $599 a month, billed monthly. No yearly figure is published (BlitzAPI pricing, September 2026).
3. Wiza: best for LinkedIn prospecting with unlimited reveals
Wiza is a LinkedIn-first finder sold per user. Yearly plans include unlimited reveals, from $83 a month per user, billed at $990 a year.
Both cap exports at 2,500 a month per seat. API access is listed on the custom-priced Team plan. The MCP server has 5 tools and needs API credits (Wiza MCP guide, September 2026).
Pros
- Unlimited email reveals on the yearly Email plan.
- A free plan with 20 valid emails.
- CRM integrations on paid plans.
Cons
- Priced per seat, so an API workload buys a seat.
- Unlimited is annual only. Phones on Email cost $0.35 each.
Best for: reps and small teams that prospect from LinkedIn.
Pricing: Free. Email $83 a month per user and Email + Phone $166, billed yearly. Team is custom (Wiza pricing, September 2026).
4. ContactOut: best for browser-first email and phone finding
ContactOut is a LinkedIn-first finder with a Chrome extension. Email is $49 a month with unlimited emails and 300 exports. Email + Phone is $99 a month with 600 exports.
Fair use is capped at 2,000 email credits and 1,000 phone credits per account a month (ContactOut terms, September 2026). The API has no public price, and People Search runs at 60 requests a minute (ContactOut API docs, September 2026).
Pros
- Unlimited emails from $49 a month, phones from $99.
- An MCP server with 15 tools (ContactOut MCP, September 2026).
- 1,000 requests a minute on most API endpoints.
Cons
- Fair use stops at 2,000 emails per account a month.
- One user per company, and no public API price.
Best for: recruiters and reps who work in the browser.
Pricing: Email $49 a month ($39 billed yearly). Email + Phone $99 ($79 billed yearly) (ContactOut pricing, September 2026).
5. Lead411: best for annual contracts with unlimited exports
Lead411 is a contact database with verified emails and a Chrome extension. Spark is $49 a month, or $490 a year, for 1,000 exports a month. Unlimited sits on Blaze, which is annual only and priced by quote.
API access is listed on Ignite and Blaze, not Spark. The docs publish no rate limit. MCP access is for approved customers and returns 401 until support enables it (Lead411 API docs, September 2026).
Pros
- An unlimited-exports tier on Blaze.
- An OpenAPI 3.1 spec and Postman collection.
- A 7-day trial with 50 exports, no card.
Cons
- Unlimited has no public price and needs an annual deal.
- MCP needs approval.
Best for: teams ready to sign an annual contract.
Pricing: Spark $49 a month ($490 a year). Ignite from $150 ($1,500 a year). Blaze by quote (Lead411 pricing, September 2026).
6. Kaspr: best for phones and emails from LinkedIn profiles
Kaspr is a LinkedIn-first finder sold per user. Starter is $65 per user a month and Business is $99, billed monthly. Both include unlimited B2B email credits under a fair use policy.
Exports are the ceiling: 12,000 a year on Starter and 30,000 on Business, and each successful API call spends one (Kaspr help, September 2026). API access is on request: 250 requests a day on Starter, 500 on Business.
Pros
- Unlimited B2B email credits on paid plans.
- Credits roll over and are shared across the account.
- Export add-ons fall to $0.03 a credit.
Cons
- 500 API requests a day on Business.
- Priced per user. No MCP server is listed.
Best for: reps who find contacts from LinkedIn profiles.
Pricing: Starter $65 and Business $99 per user a month, billed monthly. Enterprise custom (Kaspr 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 | REST. Emails from Plus | Docs only | 50 per second for accounts opened by September 30, 2026. Standard 5 |
| Wiza | LinkedIn prospecting | Email $83 a month per user, billed yearly | No public 1M price | Listed on Team | Yes. 5 tools, needs API credits | Concurrency 5 on Starter API |
| ContactOut | Browser-first finding | Email $49 a month | No public 1M price | Team / API, no public price | Yes. 15 tools | 60 a minute on People Search, 1,000 on most others |
| Lead411 | Annual unlimited exports | Spark $49 a month | No public 1M price | Ignite and Blaze | Approved customers only | No number published |
| Kaspr | LinkedIn phones and emails | Starter $65 per user a month | No public 1M price | On request, paid plans | None listed on Kaspr's pricing page or help center | 250 a day on Starter, 500 on Business |
Sources are in each tool section, checked in September 2026. Only LeadOcean and BlitzAPI publish a plan for 1M records a month.
How to choose
- Code or an agent, at volume: LeadOcean.
- A second flat-price API: BlitzAPI Plus.
- LinkedIn prospecting: Wiza on a yearly plan.
- Cheap emails in the browser: ContactOut Email.
- Annual unlimited exports: Lead411 Blaze.
- LinkedIn phones: Kaspr.
Verdict
LeadOcean wins for API, agent and volume buyers: a flat price and an MCP server that returns records. BlitzAPI is the runner-up if you run your own code and opened the account in time. Wiza wins for LinkedIn reps on annual plans, ContactOut for cheap browser lookups, Lead411 for contract exports and Kaspr for phones. Start on the free plan.
FAQ
What does "unlimited" mean for a B2B data provider?
Unlimited on one thing, such as emails, under fair use. The ceiling sits in exports, requests or seats.
Which unlimited provider is cheapest at 1M records a month?
LeadOcean Pro and BlitzAPI Plus, both $499 a month at list price. No other provider here publishes a plan for that volume.
Which providers have an MCP server that returns data?
LeadOcean, ContactOut and Wiza. BlitzAPI's reads documentation only, and Lead411's is for approved customers. Kaspr's pages list none.
Is LeadOcean really unlimited?
Pro has no credits and no per-record price. A very large month is paced down past the fair-usage line.
Do I need a credit card to try LeadOcean?
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