Best Email Enrichment Tool for Instantly Users (2026)

LeadModule is the best email enrichment tool for most Instantly users — it delivers ~85–95% find rates through a configurable waterfall of 8+ providers, supports BYOK on the free plan, and exports clean CSV files that import directly into Instantly campaigns.

LeadModule is a waterfall enrichment platform that queries providers in sequence — Prospeo, Findymail, Hunter, Dropcontact, BetterContact, FullEnrich, and others — stopping on the first verified match. You only pay for successful results.

TL;DR:

• Best for agencies at volume: LeadModule — waterfall enrichment, BYOK at $0, configurable sequences, built-in verification
• Best if you want an all-in-one platform: Clay — but BYOK costs $134/mo and it includes features most enrichment-only teams don't need
• Best managed option, no config required: FullEnrich — no BYOK, black-box provider order, but dead simple to use
• Best if you're already paying for Apollo: Apollo — enrichment is bundled, but single-provider find rates leave contacts on the table

Why Your Enrichment Tool Matters More Than Your Sending Tool

Instantly is a sending tool. It's excellent at warming domains, rotating inboxes, managing deliverability, and running high-volume sequences. What it can't control is the quality of the contact data going in.

If 40% of your lead list has no email found, your reply rates suffer before a single message is sent. And if the emails you do find bounce at high rates, Instantly's deliverability protections can only absorb so much.

The enrichment step is where campaign economics get decided. A 60% find rate means you're discarding 4 out of 10 targeted contacts. A 90% find rate on the same list is a material difference in pipeline.

How Waterfall Enrichment Works

Waterfall enrichment sends each contact through a sequence of data providers one at a time, stopping when a verified result is found.

A typical four-step waterfall:

1. Prospeo checks first. Strong LinkedIn-sourced coverage for US B2B.
2. Findymail runs if Prospeo misses. Pattern-match strength on company domains.
3. Hunter runs if both miss. Deep SMB and agency coverage.
4. Dropcontact runs last. Unusually strong EU coverage.

Because provider gaps barely overlap, each step catches contacts the previous step missed. A four-provider waterfall typically achieves find rates 25–35 percentage points higher than any single provider alone.

Tool Comparison for Instantly Users

LeadModule

Find rates: ~85–95% on well-targeted B2B lists with a multi-provider waterfall.

BYOK: Yes, starting at $0 on the free plan. Use your existing Prospeo, Findymail, Hunter, or other provider API keys. LeadModule orchestrates the waterfall — you pay provider rates directly, not a platform markup.

Managed keys: Available on paid plans ($49/mo Starter) if you'd rather not manage individual provider subscriptions.

Verification: Built-in via ZeroBounce. Emails are verified before export, reducing bounce risk in Instantly.

Instantly integration: Export results as CSV, import into Instantly. No native connector needed.

Provider sequence control: Full control. Set your own order, add or remove providers, save different configs for different client ICPs.

Best for: Agencies enriching 1,000–10,000+ contacts/month who want max find rates and cost efficiency.

Clay

Find rates: Comparable to LeadModule if configured with the same provider stack. Clay's waterfall is strong when set up well.

BYOK: Yes, but locked behind the Growth plan at $134/mo. On lower plans, you pay Clay's credit markup.

Verification: Available via integrations (not built-in on base plans).

Instantly integration: Export via CSV or use Clay's Zapier integration.

Provider sequence control: Yes — this is a Clay strength. Also includes list building, workflow automation, and AI enrichment rows.

Best for: Agencies that want enrichment plus workflow automation in one platform and are already on the $134/mo+ plan. If you only need enrichment, you're paying for features you don't use.

FullEnrich

Find rates: Solid for a managed tool. FullEnrich cascades through 20+ sources internally.

BYOK: No. You pay FullEnrich's pricing, which includes their margin over provider rates.

Instantly integration: CSV export, same as others.

Provider sequence control: None. FullEnrich controls the provider order internally. You cannot reorder, add, or remove providers.

Best for: Teams that want a simple, managed waterfall without configuring anything. No BYOK means higher per-lead cost at volume.

Apollo

Find rates: ~55–65% on typical B2B lists. Apollo is a single-source database tool — not a waterfall. You're limited to their data coverage.

BYOK: No. Apollo has its own proprietary database.

Instantly integration: Apollo exports CSV or integrates natively with Instantly via its own sending features (though many agencies separate enrichment and sending tools).

Provider sequence control: N/A — single database.

Best for: Agencies already paying for Apollo who want to use enrichment as part of their existing plan. For volume outbound, find rates will be materially lower than a waterfall tool.

Side-by-Side Comparison

Cost at Volume: What Enrichment Actually Costs

At 5,000 contacts per month, the pricing gaps become meaningful.

LeadModule (BYOK, free plan): You pay provider rates directly — no platform margin. Approximate direct cost with a three-provider waterfall: $0.01–0.015 per enriched contact depending on provider mix. For 5,000 contacts: roughly $50–75/month in provider fees.

Clay (Growth plan, $134/mo): BYOK is available, so direct provider costs apply there too. But the plan itself costs $134/mo before any provider fees.

FullEnrich (managed): No BYOK. Their managed pricing includes their margin. Typical cost at 5,000 enriched contacts: $150–200/month depending on the plan.

Apollo: Enrichment is bundled with Apollo's core plan ($49/mo base), but find rates of ~55–65% mean you need a larger input list to hit the same enriched contact count — increasing effective per-lead cost.

Recommended Workflow for Instantly Users

This is the setup most agencies running Instantly at volume use:

1. Source leads. LinkedIn Sales Navigator, Apollo for prospecting, or client-provided lists.
2. Enrich with LeadModule. Run the list through a waterfall — Prospeo → Findymail → Hunter or a sequence tuned to your ICP.
3. Verify automatically. LeadModule runs ZeroBounce verification on every result before export.
4. Export as CSV. Download the enriched, verified list.
5. Import into Instantly. Upload as a new lead list and assign to your campaign sequence.

This keeps enrichment economics clean, verification built-in, and Instantly focused on what it does best — sending.

When to Choose a Different Tool

Choose Clay if you're on the $134/mo plan and want workflow automation alongside enrichment — Clay's table/row paradigm works well for complex multi-step GTM workflows.

Choose FullEnrich if you want a simple managed waterfall and don't want to manage individual provider subscriptions or configure anything.

Stick with Apollo's enrichment if you're already a heavy Apollo user and your find rates are sufficient for your volume — reducing tool stack complexity has real value.

Related Reading

• Best Enrichment Tool for Cold Email Agencies
• LeadModule vs Clay: Full Comparison
• BYOK Enrichment Explained
• LeadModule API Quickstart