Leadpipe and FullContact both offer identity resolution APIs for developers. Both start under $200/mo. Both provide deterministic matching against their own identity graphs. But there’s an important difference in access: Leadpipe is truly self-serve - sign up, get an API key, and start querying in minutes. FullContact advertises pricing from $99/mo, but access requires a sales conversation.
But they solve different problems and return different data. FullContact is an enrichment API - you give it a known identifier (email, phone number, social handle) and it gives you back a richer profile. Leadpipe is a visitor identification API - it identifies anonymous website visitors you didn’t know about and returns full person records with intent data.
Understanding this distinction will save you from choosing the wrong tool and spending weeks integrating something that doesn’t match your actual use case.
Quick Comparison Table
| Feature | FullContact | Leadpipe |
|---|---|---|
| Starting price | $99/mo advertised (sales required) | $147/mo (500 IDs + intent) |
| Identity graph size | 1B+ profiles | 4.44B profiles |
| Match rate (real-world) | 40-60% (enrichment) | 30-40% (visitor ID) |
| Matching method | Deterministic | Deterministic |
| Visitor identification | No | Yes |
| Intent data | No | Yes (20,735 topics) |
| Webhook streaming | No | Yes |
| API endpoints | ~10 | 23 |
| TypeScript SDK | No (community wrappers) | Yes (official, MIT) |
| MCP server | No | Yes (27 tools) |
| Person-level data | Yes | Yes (100+ data points) |
| Social profile data | Yes (900+ attributes) | LinkedIn, Facebook, other social profiles |
| Self-serve signup | No (sales required) | Yes |
| Annual contract required | No | No |
The table tells the story at a glance: FullContact is wider (more enrichment attributes per known contact), Leadpipe is deeper (discovers unknown visitors and adds intent data). They’re complementary tools, not direct substitutes.
FullContact: What It Does Well (and What It Doesn’t)
Strengths
Social profile enrichment. This is where FullContact genuinely excels. Give it an email address and it returns social profiles across Twitter, LinkedIn, Facebook, Instagram, and more. You get profile photos, bios, follower counts, and activity signals. For teams building contact records that need social context, this is valuable data that most identity resolution APIs don’t provide.
Enrichment attribute depth. FullContact returns 900+ attributes per person when data is available. Beyond basic contact info, you get interests, affinities, demographics, and household data. This breadth is useful for personalization and segmentation use cases.
API design. FullContact’s API is clean and well-documented. Predictable request/response schemas. Good error handling. The developer experience for the core enrichment endpoints is solid.
Published pricing. FullContact advertises pricing from $99/mo for 1,000 API credits. However, despite listing prices on their website, getting access requires contacting their sales team. In a market where most identity providers hide pricing behind “contact us” forms, the pricing transparency is helpful - but you’ll still need a sales conversation to get started.
Profile size. 1B+ person profiles is a large enrichment database. For US and European business contacts, coverage is generally strong.
Limitations
No visitor identification. This is the biggest gap. FullContact cannot identify anonymous website visitors. You need to already have an email address, phone number, or social handle to query the API. If your primary use case is “who’s visiting my website?”, FullContact can’t help you.
No intent data. FullContact tells you who someone is, but not what they’re researching or whether they’re in-market. There’s no equivalent to Leadpipe’s Orbit product with its 20,735 intent topics. For sales teams trying to prioritize outreach, this is a significant gap.
No webhook streaming. You query the API and get a response. There’s no way to set up real-time push notifications when data changes or when new matches become available. This limits integration options for event-driven architectures and AI agent workflows.
Single-source matching. FullContact matches against its own graph. If the identifier you submit isn’t in their graph, you get an empty response. There’s no waterfall approach or fallback matching.
No official SDK. There are community-maintained wrappers, but no official TypeScript/JavaScript SDK from FullContact. No MCP server for AI agents. If you’re building modern tooling around identity data, you’re working with raw HTTP calls.
Leadpipe: What It Does Well (and What It Doesn’t)
Strengths
Visitor identification. This is Leadpipe’s core capability - identifying anonymous website visitors and resolving them to real people with contact data. You deploy a pixel, and the API returns person-level records for 30-40% of your traffic. No prior identifier needed. This is fundamentally different from enrichment.
Intent data. The Orbit product adds person-level intent signals across 20,735 topics. Not company-level “surge” data (someone at Acme is researching CRM) but individual-level (Jane Rodriguez at Acme has been researching HubSpot alternatives for 3 weeks). This is the difference between knowing who visited and knowing who’s ready to buy.
Identity graph scale. 4.44 billion person profiles - the largest self-serve identity graph available, and 4.4x larger than FullContact’s graph. This translates directly to the highest match rates in the market - independent tests show Leadpipe identifies 240-300% more visitors than competing tools, with an accuracy score of 8.7/10 (next best: 6.5/10).
Developer ecosystem. 23 API endpoints, official TypeScript SDK (npm install @leadpipe/client), MCP server with 27 tools for AI agents (npx -y @leadpipe/mcp), real-time webhooks, flat file/CSV exports, and REST API. This is the most complete developer experience in the identity resolution space - no other provider offers this breadth of delivery and integration options.
Webhook streaming. Set up a webhook URL when you create a pixel, and Leadpipe pushes identified visitor data to your endpoint in real-time. This enables event-driven workflows - trigger a Slack alert, update your CRM, or feed data into an AI SDR the moment a visitor is identified.
100+ data points per person. Every resolved visitor comes back with name, emails (personal and work), phone numbers, photo, age, gender, income, net worth, LinkedIn, Facebook, other social profiles, job title, seniority, full work history, company details, firmographics, NAICS/SIC codes, HEMs (hashed emails for ad platform matching), cookies, device IDs, pages viewed, visit behavior, and intent signals. All in one API response. See the full field reference.
Limitations
Social profiles included but not as deep as FullContact. Leadpipe returns LinkedIn, Facebook, and other social profile URLs, but doesn’t provide the depth of social metadata (follower counts, bios, activity signals) that FullContact offers. If you need rich social context beyond profile links, you may want to supplement with an enrichment tool.
US-focused for person-level data. Person-level visitor identification (name, email, phone) is US traffic only. International visitors get company-level data (company name, industry, size). If your traffic is primarily non-US, the person-level match rate will be lower.
30-40% match rate. The majority of visitors (60-70%) aren’t identified. This is inherent to deterministic matching - the system only returns results when it has high confidence. It’s better to identify 35% correctly than 70% with 30% wrong data, but the coverage gap means you’re still missing most visitors.
Newer in market. FullContact has been in the identity space longer and has broader enterprise brand recognition. Leadpipe’s track record is shorter, though the technology and data coverage are strong.
Data Comparison: What Each API Returns
Here’s a side-by-side of what you actually get back from each API per person record.
Contact Data
| Field | FullContact | Leadpipe |
|---|---|---|
| Full name | Yes | Yes |
| Personal email | Varies | Yes |
| Work email | Varies | Yes |
| Phone (direct) | Varies | Yes |
| Phone (mobile) | Varies | Yes |
| LinkedIn URL | Yes | Yes |
| Twitter handle | Yes | No |
| Facebook URL | Yes | Yes |
| Yes | No | |
| Profile photo | Yes | Yes |
| Other social profiles | Yes | Yes |
Professional Data
| Field | FullContact | Leadpipe |
|---|---|---|
| Job title | Yes | Yes |
| Department | Limited | Yes |
| Seniority level | Limited | Yes (normalized) |
| Company name | Yes | Yes |
| Company domain | Yes | Yes |
| Industry | Yes | Yes |
| Employee count | Yes | Yes |
| Revenue range | Limited | Yes |
| Company LinkedIn | No | Yes |
Behavioral & Intent Data
| Field | FullContact | Leadpipe |
|---|---|---|
| Pages viewed | N/A | Yes |
| Visit timestamps | N/A | Yes |
| Session count | N/A | Yes |
| Referral source | N/A | Yes |
| Time on site | N/A | Yes |
| Intent topics | No | Yes (20,735 topics) |
| Intent strength | No | Yes |
| Interests/affinities | Yes | No |
| Demographics | Yes | Limited |
| Household data | Yes | No |
The pattern is clear: FullContact is wider on enrichment attributes (social profiles, demographics, interests). Leadpipe is deeper on actionable B2B data (behavioral signals, intent data, company firmographics) and provides the discovery layer (visitor identification) that FullContact doesn’t offer.
Match Rate Reality
Match rates are the most misleading metric in the identity resolution space. Let’s be specific about what each provider actually delivers.
FullContact Match Rates
FullContact markets match rates of 85%+. In practice, independent reviews and real-world testing show 40-60% match rates depending on your input quality and geography.
- Email lookups: Strongest performance, 60-70% match rates for US business emails
- Phone lookups: Moderate, 40-50%
- Name + company lookups: Weaker, 30-40%
- Social handle lookups: Variable, depends on the platform
These rates measure enrichment hits - you submit a known identifier and see how often FullContact returns data. This is a fundamentally different metric than visitor identification rates.
Leadpipe Match Rates
Leadpipe reports 30-40% match rates for anonymous visitor identification. This sounds lower than FullContact’s numbers, but the comparison is misleading because you’re measuring completely different things.
FullContact starts with a known email address and asks “do I have data for this person?” Leadpipe starts with zero known information - an anonymous website visit - and asks “can I figure out who this person is?”
Resolving an unknown visitor is a harder problem than enriching a known contact. The 30-40% rate means that on a site with 10,000 monthly visitors, Leadpipe identifies 3,000-4,000 people from nothing. These are contacts you’d never have found through enrichment because you didn’t know they existed in the first place.
In head-to-head tests against other visitor identification tools (not enrichment tools), Leadpipe identifies 240-300% more visitors. The difference comes from the proprietary identity graph with 4.44 billion profiles versus competitors who license smaller, shared graphs.
Pricing Comparison
FullContact
| Plan | Price | Credits | Per-Credit Cost |
|---|---|---|---|
| Starter | $99/mo | 1,000 | $0.099 |
| Growth | Custom | Custom | Decreasing |
| Enterprise | Custom | Custom | Volume pricing |
FullContact uses a credit-based model. Each API call (person enrichment, company enrichment) consumes credits. Match or no match, you use a credit. This means your effective cost per matched record depends on your match rate - at 50% match rate, your cost per enriched contact is roughly $0.20.
Leadpipe
| Plan | Price | Identified Visitors | Includes |
|---|---|---|---|
| Starter | $147/mo | 500 | Visitor ID + Intent data ($0.29/ID) |
| Growth | $299/mo | More IDs | Volume pricing |
| Agency | $1,279/mo | 20,000 | $0.064/ID |
| High-Volume | ~$8,000/mo | 1M+ | ~$0.008/ID |
Leadpipe charges per identified visitor. You only count identified leads against your quota - unmatched visitors don’t cost you anything. Intent data (Orbit) is included in the subscription, not an add-on. No per-query charges for API calls within rate limits. At scale, cost per identification drops from $0.29 to under a penny - dramatically cheaper than enterprise alternatives like LiveRamp ($50K+/yr) for comparable volume.
True Cost Comparison
The pricing comparison isn’t straightforward because the products do different things. But here’s how to think about it:
If you need to enrich 1,000 existing contacts: FullContact costs $99/mo. Leadpipe can’t do this (it’s not an enrichment API for known contacts).
If you want to identify anonymous website visitors: Leadpipe costs $147/mo for 500 identified visitors. FullContact can’t do this at any price (it doesn’t offer visitor identification).
If you want both enrichment AND visitor identification: You’d need both tools - $99/mo (FullContact) + $147/mo (Leadpipe) = $246/mo total. Or you use Leadpipe for visitor identification and a different enrichment tool for supplementary data.
The key question isn’t “which is cheaper?” It’s “what problem am I solving?” If you already have contact records and want to add social and demographic data, FullContact is the right tool. If you’re trying to discover who’s visiting your website and what they’re researching, Leadpipe is the right tool.
When to Use FullContact vs Leadpipe
Use FullContact When:
- You have existing contact lists that need enrichment (emails, phone numbers, social handles)
- You need social profile data (Twitter, Facebook, Instagram) for personalization
- Your use case is contact data hygiene - deduplicating and standardizing records
- You need demographic and household data for segmentation
- Your budget is under $100/mo and you only need enrichment
Use Leadpipe When:
- You want to identify anonymous website visitors (the primary use case)
- You need person-level intent data to prioritize outreach
- You’re building an AI agent or AI SDR that needs real-time identity data
- You need webhook streaming for event-driven workflows
- You’re a platform builder who wants to embed identity resolution in your product
- You need a TypeScript SDK or MCP server for AI tooling
Don’t Confuse the Two When:
You have zero contact data and want to build a list. FullContact can’t help because you need an existing identifier to query against. Leadpipe can identify people who visit your website - but you need website traffic first.
You want to “verify” existing emails. Neither tool is an email verification service. Use a dedicated tool like ZeroBounce or NeverBounce for that.
You need global person-level data. Both are strongest in the US market. FullContact has some international coverage. Leadpipe provides company-level data internationally but person-level only for US traffic.
Can You Use Both?
Yes, and it’s a genuinely good strategy for teams that need both discovery and enrichment.
The complementary workflow:
- Leadpipe identifies anonymous website visitors, returning name, email, phone, company data, pages viewed, and intent signals
- FullContact enriches those identified contacts with social profile data, demographic attributes, and interest signals
- Your CRM or sales tool gets a complete contact record - identity from Leadpipe, social context from FullContact
This workflow costs roughly $246/mo combined ($147 Leadpipe + $99 FullContact) and gives you the widest possible data coverage. You’re not paying twice for the same data - you’re layering two different data types.
The integration is straightforward. When Leadpipe’s webhook fires with a new identified visitor, you take the email address from the response and query FullContact’s person enrichment endpoint. Combine the results into a single contact record. A simple Node.js function or Zapier automation handles it.
When using both doesn’t make sense:
- If you’re only doing enrichment (no website traffic to identify), just use FullContact
- If deep social metadata (follower counts, bios) isn’t critical, Leadpipe’s 100+ data points - including social profile links, HEMs, and demographic data - are sufficient alone
- If your budget is tight, pick the one that matches your primary use case
For teams comparing more identity resolution options beyond these two, see the full Identity Resolution API Comparison.
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FAQ
Is FullContact or Leadpipe better for lead generation?
It depends on your lead generation approach. If you’re doing outbound and already have a target list of emails/domains to enrich, FullContact adds the data you need. If you’re doing inbound and want to convert anonymous website traffic into actionable leads, Leadpipe is the right tool. Most teams doing both inbound and outbound benefit from using Leadpipe for discovery and a contact database (Apollo, ZoomInfo) or enrichment API (FullContact) for supplementary data. See our comparison of all identity resolution APIs for more options.
Can FullContact identify anonymous website visitors?
No. FullContact requires a known identifier (email address, phone number, social handle, or name + company combination) to return data. It cannot identify anonymous visitors from website traffic. This is the fundamental architectural difference between enrichment APIs and visitor identification APIs. If you need visitor identification, you need a tool like Leadpipe that deploys a pixel and resolves anonymous signals against an identity graph.
Why is Leadpipe’s match rate lower than FullContact’s?
Because they’re measuring different things. FullContact measures enrichment hit rates - what percentage of submitted emails return data. Leadpipe measures visitor identification rates - what percentage of completely anonymous website visitors can be resolved to real people. Starting from zero known information and identifying a person is a fundamentally harder problem than adding data to a known email address. Comparing these rates directly is like comparing a search engine’s recall (finding relevant pages from a query) to a database lookup rate (finding records from a primary key).
Do either of these tools work outside the US?
FullContact has international coverage for enrichment, particularly in English-speaking markets and Western Europe. Match rates are lower outside the US. Leadpipe provides person-level visitor identification for US traffic and company-level identification for international traffic. If your audience is primarily non-US, both tools will have reduced effectiveness for person-level data. For a broader view of identity resolution options including those with stronger international coverage, see the B2B identity resolution API guide.
Which one has better developer experience?
Leadpipe leads the market in developer experience: 23 REST endpoints, official TypeScript SDK, MCP server with 27 tools, real-time webhooks, flat file/CSV exports, and published rate limits (200 req/min). FullContact has a clean, well-documented REST API but no official SDK, no MCP server, no webhook support, and no flat file export option. If you’re integrating via raw HTTP calls, both are straightforward. If you want SDK/tooling support or multiple delivery methods, Leadpipe has a significant advantage.
The Bottom Line
FullContact and Leadpipe are both good identity resolution APIs, but they solve different problems. FullContact enriches contacts you already know about. Leadpipe discovers contacts you didn’t know existed. FullContact gives you social context. Leadpipe gives you buying intent.
If you need to choose one, ask yourself: “Is my problem that I don’t know enough about my existing contacts? Or is my problem that I don’t know who’s visiting my website?” The answer tells you which tool to use.
If you have the budget for both, they’re genuinely complementary. Use Leadpipe for discovery and intent. Use FullContact for social enrichment. Layer the data in your CRM and let your sales team work from the most complete contact records possible.
Want to see what Leadpipe identifies on your site? Start with 500 free identified visitors - full person records with intent data. Deploy the pixel, see the data, then decide if it’s worth the $147/mo.
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