7 Best AI-Ark API Alternatives for Developers (2026)

Developers leave AI-Ark's API when a pipeline outgrows its defaults. The limit is 5 requests per second per key, and custom limits start at 450,000 credits a month (AI-Ark docs, September 2026). One search retrieves at most 10,000 records, and one export job holds 10,000 people. Emails come from a second, asynchronous call, and the trackId that links it expires after 6 hours. Every action is metered: 0.5 credits for a profile, 0.5 for a verified email and 5 for a mobile number. The MCP server takes your API key in the URL query string (AI-Ark MCP docs, September 2026).

This page ranks seven alternatives for developers, on auth, rate limits, bulk export, MCP and the cost of 1M records. For a two-column view, see LeadOcean vs AI-Ark. For app-first tools, read AI-Ark alternatives.

TL;DR

"1M records" here means 1M work-email lookups that return a result, one credit each where the vendor uses credits. Where a vendor sells no plan at 1M, the cell says so and names the highest public tier. Enterprise quotes can be lower, so ask each vendor at your volume.

For reference, AI-Ark lists $2 to $4 per 1,000 credits on plans above 30,000 credits a month. A person with a verified email is 1 credit, so 1M records is $2,000 to $4,000 at list (AI-Ark pricing, September 2026). That is the number to beat.

What we evaluated

• Auth and schema: the header, the request shape and how filters combine.
• Rate limits: the default per-key limit, what raises it and what a bulk call can carry.
• Bulk export: rows per job or request, and whether the flow is one call or several.
• MCP: whether an agent can search and enrich through the server, and how it signs in.
• Cost at 1M records: flat, credits or seats, from the vendor's public price list.

We read each vendor's pricing page and docs in September 2026. We ran no accuracy test, so we quote no quality numbers.

1. LeadOcean: best for API, agent and volume pulls

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 number, plus 63M companies. You search with 50 people filters and 34 company filters. Filters are flat: several values in one filter join with OR, and separate filters join with AND (LeadOcean docs, September 2026).

The price does not move with volume. Pro is $499 a month with unlimited searches, enrichments and lookups, 5 API keys and 100 requests per second per key. There are no credits. A very large month is paced down, not cut off. More headroom is one email to support.

Here is the same single-person lookup on both APIs. AI-Ark's Export Single Person with Email costs 1 credit when it finds an email. LeadOcean's enrich call is 1 record, inside the flat fee. Both take a LinkedIn URL.

curl -X POST "https://api.ai-ark.com/api/developer-portal/v1/people/export/single" \
  -H "X-TOKEN: $AI_ARK_API_KEY" \
  -H "content-type: application/json" \
  -d '{"url":"https://www.linkedin.com/in/jane-doe"}'

curl -X POST "https://api.leadocean.io/v1/people/enrich" \
  -H "x-api-key: $LEADOCEAN_API_KEY" \
  -H "content-type: application/json" \
  -d '{"linkedin_url":"https://www.linkedin.com/in/jane-doe","reveal_email":true}'

Sizing an audience is free on LeadOcean: count=true with limit=1 returns the total and spends no records. AI-Ark's preview costs 1 credit a page.

curl -X POST "https://api.leadocean.io/v1/companies/search?count=true" \
  -H "x-api-key: $LEADOCEAN_API_KEY" \
  -H "content-type: application/json" \
  -d '{"hqCountry":["DE"],"employeeRange":["51-200"],"limit":1}'

For bulk, POST /v1/exports takes any people search and writes up to 50,000 rows per request to a CSV. A 1M-row pull is 20 requests, spread over two days because exports stop at 500,000 rows a day. On AI-Ark it is 100 jobs of 10,000 people. The MCP server at https://api.leadocean.io/mcp signs in with OAuth 2.1 and exposes 12 tools, from search_leads to find_phone and export_leads.

Pros

• Flat $499 a month at any volume, with no credit meter.
• REST and MCP on every plan, including Free, with OAuth sign-in and no key in a URL.
• Free counts, and a miss on POST /v1/people/enrich is a free 404.
• Email status on every record, from verified to spam_trap.
• 100 requests per second per key on every plan.

Cons

• No lookalike search and no semantic text matching. You filter on fields and closed-list values.
• No job postings, live web data or change alerts.
• Exports stop at 500,000 rows a day, and a v2 contact miss costs one record.

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 a second flat-price search API

BlitzAPI sells B2B data as an API on flat monthly plans. It lists 550M+ contacts tied to LinkedIn profiles and 65M+ companies, with people and company search, email and phone enrichment and job data (BlitzAPI docs, September 2026). Auth is an x-api-key header, and there are typed Python and TypeScript SDKs (BlitzAPI docs, September 2026).

The plan ladder is where it gets fiddly. 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). Search returns 50 results a page and stops at 50,000 results per query (BlitzAPI docs, September 2026).

Check two things before you commit. The 50 requests per second and 15,000,000 monthly results are tied to accounts opened by September 30, 2026, against a standard 5 per second. Limits also apply per endpoint (BlitzAPI docs, September 2026). And its MCP server gives an assistant the API documentation, not the data (BlitzAPI docs, September 2026).

Pros

• Flat monthly price. The 15,000,000 results a month line is the launch-offer limit for accounts opened by September 30, 2026 (BlitzAPI terms, September 2026). Limits for later accounts are not published.
• 50 requests per second per endpoint on the current plans, ten times AI-Ark's default.
• Jobs data sits next to people and company search, with 1,000 free credits.

Cons

• Three paid tiers, and phones need the top one, US only.
• The MCP server reads docs. An agent cannot search or enrich through it.
• The fast rate limit depends on when the account opened. After September 30 the lifetime offer closes to new accounts. The only published standard figure is 5 requests per second per endpoint. Plan prices and monthly volume for later accounts are set by the website or order form at the time of subscription (BlitzAPI pricing, BlitzAPI Terms, section 9.1).

Best for: teams that want a flat-price search and enrichment API and run their own code.

Pricing: Core $399, Plus $499, Full $599 a month (BlitzAPI pricing, September 2026).

3. LeadMagic: best for cheap valid emails by API

LeadMagic is a credit-based enrichment API. It lists 400M+ people and 25M+ companies and reaches them through REST, CSV, a command-line tool and a hosted MCP server (LeadMagic, September 2026). Auth is an X-API-Key header. Failed lookups cost nothing.

The credit price falls as you climb the plans. Essential is $99 a month for 5,000 credits. Professional is $499 for 50,000. Ultimate is $849 for 100,000, or $0.00849 a credit (LeadMagic pricing, September 2026). A valid email costs 1 credit and a mobile costs 5.

The Email Finder endpoint allows 600 requests a minute, which is 10 a second, twice AI-Ark's default. Search returns up to 50 rows per cursor page, but only 25 rows per page on the zero-credit Professional and Ultimate lane (LeadMagic docs, September 2026). LeadMagic also states that a sustained find rate below 10% can lead to throttling or suspension (LeadMagic docs, September 2026). The MCP server uses OAuth, and a preview_cost call shows the price of a large job first (LeadMagic docs, September 2026).

Pros

• The lowest list price per email among the credit vendors here: $0.00849 on Ultimate.
• No charge when an email is not found.
• Hosted MCP with OAuth and a cost preview before large operations.
• REST on every plan, with 10 requests a second on the email finder.

Cons

• The top self-serve plan is 100,000 credits, so 1M a month needs an Enterprise quote. Extrapolating Ultimate's rate gives $8,490 for 1,000,000 credits, but that is arithmetic, not a public plan.
• Search and export are capped per day by plan: 10,000 rows on Essential, 100,000 on Ultimate.
• A minimum find-rate policy can throttle lists with poor match rates.

Best for: teams that enrich a few hundred thousand valid emails a month and want pay-on-success credits.

Pricing: Essential $99, Growth $249, Professional $499, Ultimate $849 a month (LeadMagic pricing, September 2026).

4. FullEnrich: best for waterfall emails and mobiles

FullEnrich is a waterfall API. It queries 25+ sources for each contact, and you pay only for data it finds (FullEnrich pricing, September 2026). Its pricing page lists API access, search and an MCP server on Pro. Auth is a Bearer token.

Credits are the meter. A work email costs 1 credit, a personal email 3 and a mobile 10. Pro is $29 a month for 500 credits, which is $0.058 each. The 1,000-credit tier is $55 a month, or $0.055 each. Search costs 0.25 credits per person returned (FullEnrich docs, September 2026).

The API allows 60 calls a minute, with up to 100 contacts in a bulk request. That is slower than AI-Ark's 5 a second, and bulk enrichment is asynchronous, so you wait for a webhook or poll (FullEnrich docs, September 2026). The MCP server can search, enrich and export, and it asks you before it spends credits (FullEnrich help, September 2026).

Pros

• Waterfall across 25+ sources, so one call can cover several vendors.
• Search, enrichment and export in the MCP server.
• Credits roll over for 3 months on monthly plans.

Cons

• Mobiles cost 10 credits each, twice AI-Ark's 5.
• The default API limit is 60 calls a minute, well under AI-Ark's 5 a second.
• A credit meter at volume. There is no public price at 1M work emails. The highest monthly tier is 100,000 credits for $3,500 a month ($0.035 a credit), and above that you contact sales (FullEnrich pricing, September 2026).

Best for: teams that want waterfall contact data, mostly emails and mobiles, on a modest monthly volume.

Pricing: Pro $29 a month for 500 credits, with a 1,000-credit tier at $55. Enterprise custom (FullEnrich pricing, September 2026).

5. People Data Labs: best for licensed datasets and bulk enrichment

People Data Labs (PDL) is a long-running person and company data API with dataset licences. Its All dataset lists 2.47 billion profiles, 592 million with an email (PDL docs, September 2026). You pass the key in the URL, in a header or through an SDK (PDL docs, September 2026). Person search queries any field in the person schema.

It charges per match: a request that returns a person costs one credit, and a miss costs none. Pro starts at $98 a month for 350 credits, which is $0.28 each. PDL puts it at about $0.20 to $0.28 a profile, and above about 100,000 profiles a year it is quote only (PDL docs, September 2026).

The rate limits split by endpoint. Enrichment allows 1,000 calls a minute on paid plans, and Bulk Person Enrichment takes 100 people per request. Person Search defaults to 10 calls a minute (PDL docs, September 2026). We found no official MCP server in PDL's docs (PDL docs, September 2026).

Pros

• A stated 1,000 calls a minute for enrichment on paid plans.
• Bulk person enrichment and dataset licences for your own warehouse.
• ISO and SOC 2 Type 2 shown on the pricing page.

Cons

• No public 1M price. Pro runs about $0.20 to $0.28 a profile and volume above about 100,000 profiles a year is quote only.
• Person Search at 10 calls a minute is slow for list building.
• No official MCP server found, so agents need a wrapper you host.

Best for: data teams that license files, need compliance paperwork and accept per-record pricing.

Pricing: Free up to 100 records a month. Pro from $98 a month for 350 credits. Enterprise custom (PDL pricing, September 2026).

6. Crustdata: best for live data and change alerts

Crustdata sells real-time company and people data through APIs for search, enrichment, jobs, posts and watchers. It lists 1 billion+ people and describes its data as continuously re-verified (Crustdata, September 2026). It fits signal work better than bulk list building.

Pricing is credit based and the public page shows no dollar price per credit (Crustdata pricing, September 2026). The docs list costs per call. Person search is 0.03 credits per result, person enrichment 1 to 7 credits, and contact enrichment 1 to 5.5 credits (Crustdata docs, September 2026). Filters nest in and/or groups.

Volume is the catch. Standard search and enrich endpoints default to 15 to 30 requests a minute, and higher limits go through support (Crustdata docs, September 2026). Batch jobs carry up to 10,000 people (Crustdata docs, September 2026). The contact endpoint needs an enterprise plan (Crustdata docs, September 2026). The MCP server at install.crustdata.com/mcp signs in with OAuth (Crustdata docs, September 2026).

Pros

• Live data and change watchers that a static database lacks.
• Cheap search at 0.03 credits per result, so you narrow before you enrich.
• An MCP server with OAuth sign-in.

Cons

• No public price per credit, so you cannot price 1M records from the site.
• Default limits of 15 to 30 requests a minute sit far below AI-Ark's 5 a second.
• Self-serve keys cannot call the contact endpoint.

Best for: AI SDR and signal workflows that need fresh data more than raw volume.

Pricing: Credit based, with no public price list. Per-call credit costs are in the docs (Crustdata docs, September 2026).

7. Coresignal: best for raw profiles and job postings

Coresignal sells employee, company and job records on credits. It lists 907M+ employee profiles, 70M+ companies and 482M+ job postings (Coresignal, September 2026). Auth is an apikey header, and search supports Elasticsearch DSL (Coresignal docs, September 2026). Employee records carry professional emails and no phone numbers.

Pro is $499 a month for 35,000 credits and 10 requests per second. Elite is $5,000 for 10,000,000 credits, or $0.0005 a credit. A Base record costs 10 credits, a multi-source record 20 and a contact enrichment 20 (Coresignal pricing, September 2026). At the Pro rate, $499 buys 3,500 Base records.

Limits run from 5 to 100+ requests per second by plan (Coresignal docs, September 2026). Bulk Collect is asynchronous and holds 10,000 records per request (Coresignal docs, September 2026). The OAuth 2.1 MCP server has 5 tools, and entity_search costs 20 credits a call (Coresignal MCP docs, September 2026).

Pros

• Jobs data at 1 credit a posting, and a large raw profile count.
• OAuth 2.1 MCP server, with no key in a URL.
• Flat-file datasets if you would rather hold the data.

Cons

• No phone numbers in employee records.
• The $499 plan buys only 3,500 Base records, so volume means the $5,000 tier or a quote.
• MCP searches spend credits.

Best for: teams that need job postings, raw profile volume or licensed datasets more than contact data.

Pricing: Pro $499 a month for 35,000 credits. Elite $5,000 a month for 10,000,000 credits (Coresignal pricing, September 2026).

Comparison table

Sources are linked in each tool section, all checked in September 2026. Confirm on the pricing page before you buy. The 1M column uses each vendor's public tiers where they reach 1M. PDL has no public 1M price: above about 100,000 profiles a year it is quote only. Coresignal is 20 credits a record at the Elite rate.

How to choose

• You pull data in code or with an agent, at volume: LeadOcean. One flat price, REST and MCP on every plan, 100 requests per second.
• You want a flat-price API from a second vendor: BlitzAPI Plus, if you can live with a docs-only MCP server.
• You buy valid emails by the hundred thousand: LeadMagic, at $0.00849 a credit on Ultimate.
• You need waterfall emails and mobiles: FullEnrich, and budget 10 credits per mobile.
• You need licensed files or compliance paperwork: People Data Labs.
• You need fresh signals and hiring events: Crustdata, with a rate-limit conversation first.
• You need job postings or raw profile volume: Coresignal.
• You like lookalike search or an app for non-coders: stay on AI-Ark and move only the volume pulls.

Verdict

LeadOcean wins for developers who pull data at volume in code or through an agent. It has a flat price, a 100 requests per second limit and an MCP server that returns records with OAuth sign-in. BlitzAPI is the flat-price runner-up if you run your own code. LeadMagic wins for cheap valid emails and FullEnrich for waterfall mobiles. PDL wins for licensed datasets, Crustdata for live signals and Coresignal for job postings. Stay on AI-Ark if you need lookalike search and stay under roughly 125,000 records a month. Otherwise start on the free plan and compare the same lookups.

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