B2B Contact Enrichment

Find verified professional email addresses with the FinalScout API — by LinkedIn profile URL, by full name + company domain, or by news article URL (author lookup). Supports single lookups (long-polling waterfall or submit-and-poll), bulk batch tasks with progress tracking, paginated result dump, CSV export, webhooks, and account credits / rate-limit checks.

FinalScout Email Finder & Contact Enrichment

Find verified professional email addresses. Pick the find method by what the user has:

User has	Method	Single endpoint	Bulk endpoint
LinkedIn profile URL	linkedin	POST /v1/find/linkedin/single	POST /v1/find/linkedin/bulk
Full name + company domain	professional	POST /v1/find/professional/single	POST /v1/find/professional/bulk
News article URL (find its author)	author	POST /v1/find/author/single	POST /v1/find/author/bulk

Base URLs:

• Standard API: https://api.finalscout.com
• Waterfall API (long-polling single finds): https://api-waterfall.finalscout.com

Auth: every request needs the header Authorization: $FINALSCOUT_API_KEY (raw key, no Bearer prefix).

Choosing a flow:

• 1 to a few contacts → Waterfall single (one blocking call per contact, no polling).
• Many contacts (CSV, list, table, JSON) → Bulk (async task: submit → poll status → dump/export results).

---

Person object per method

The person object (single) / persons array items (bulk) differ by method:

linkedin — only linkedin_url is required:

json

{
  "linkedin_url": "https://www.linkedin.com/in/williamhgates/",
  "full_name": "",
  "current_positions": [
    {"company_name": "", "company_linkedin_url": "", "title": "", "location": ""}
  ],
  "meta_data": {"your_key": "your value"}
}

Supported linkedin_url formats: https://www.linkedin.com/in/<slug>, https://www.linkedin.com/in/<ACoAA... id>, Sales Navigator https://www.linkedin.com/sales/people/<id>,name,sSHS and https://www.linkedin.com/sales/lead/<id>,name,sSHS. Supported company_linkedin_url formats: https://www.linkedin.com/company/<slug|id>, https://www.linkedin.com/sales/company/<id>. Cost is 1 credit per email found whether you send just the URL or the URL plus full profile info (full_name, company_name, company_linkedin_url, title, location).

professional — full_name and domain are required:

json

{
  "full_name": "Bill Gates",
  "domain": "microsoft.com",
  "domain_extra": ["gatesfoundation.org"],
  "deep_verify": false,
  "meta_data": {"your_key": "your value"}
}

domain_extra (optional): extra candidate domains. deep_verify (optional, default false): deeper email verification — only set true when confident the domain is valid for the person.

author — only article_url is required:

json

{
  "article_url": "https://www.forbes.com/sites/.../article-slug/",
  "meta_data": {"your_key": "your value"}
}

meta_data (optional, all methods): flat object of string values (e.g. CRM contact id). Echoed back in responses, dump items, and webhook events — use it to correlate results with the user's data.

---

Single lookup — Waterfall (preferred)

One blocking call; the server holds the connection until the task finishes or timeout (seconds, 30–600, default 80) is reached.

bash

curl -s -m 130 -w "\nHTTP %{http_code}" \
  "https://api-waterfall.finalscout.com/find/professional/single?timeout=120" \
  -H "Authorization: $FINALSCOUT_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"person":{"full_name":"<name>","domain":"<domain>"}}'

Swap the path for /find/linkedin/single or /find/author/single with the matching person body. Set curl's -m (max time) a bit above the timeout value. Longer timeouts (up to 600) mean fewer round-trips; use a shorter one if your shell caps command runtime.

Responses:

• HTTP 200 → task complete; read contact, credits_consumed, credits_available (see Interpreting results).
• HTTP 408 → still running; body has {"id": "...", "status": "Running"}. Resubmit the same request to keep waiting, or poll /v1/find/single/status?id=<id>.

Optional body fields (top level, next to person):

• "tags": ["tag1"] — organize contacts in the FinalScout web app (all methods)
• "webhook_url": "<url>" — receive a single_task.finished event (all methods; see Webhooks)
• "enable_work_email": true — default true; find work emails (linkedin method only)
• "enable_personal_email": false — default false; fall back to personal emails, e.g. Gmail (linkedin method only)
• "enable_generic_email": false — default false; fall back to generic emails, e.g. support@ (linkedin method only)

Single lookup — submit + poll (alternative)

Use when a long-held connection is not an option.

Submit (same bodies and optional fields as waterfall):

bash

curl -s -X POST https://api.finalscout.com/v1/find/professional/single \
  -H "Authorization: $FINALSCOUT_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"person":{"full_name":"<name>","domain":"<domain>"}}'

Save the returned id. If status is already Complete, done.

Poll every 3 seconds until status is Complete (works for any single find task, all three methods):

bash

curl -s "https://api.finalscout.com/v1/find/single/status?id=<id>" \
  -H "Authorization: $FINALSCOUT_API_KEY"

Give up after ~40 attempts (2 minutes) and report the task id so the user can check later.

---

Bulk lookup

1. Submit

Parse the user's input (CSV, list, table, JSON) into a persons array of the matching person objects. Strip empty rows.

bash

curl -s -X POST https://api.finalscout.com/v1/find/professional/bulk \
  -H "Authorization: $FINALSCOUT_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "persons": [
      {"full_name": "Bill Gates", "domain": "microsoft.com"},
      {"full_name": "Elon Musk",  "domain": "tesla.com"}
    ],
    "name": "Bulk find - <date>",
    "duplicate": "skip_duplicates"
  }'

Endpoints: /v1/find/professional/bulk, /v1/find/linkedin/bulk, /v1/find/author/bulk.

Optional top-level fields (all bulk endpoints unless noted):

• "name" — task name, max 300 characters
• "duplicate" — skip_duplicates (default) or scrape_and_update_duplicates (re-process contacts already in the account)
• "tags": ["tag1"]
• "webhook_url": "<url>" and "webhook_subscribe_events": ["bulk_task.finished", "contact.change"] — see Webhooks
• "enable_work_email" / "enable_personal_email" / "enable_generic_email" — linkedin bulk only, same defaults as single

The response is the task: {id, status, total, finished, success, duplicated, credits_consumed, credits_available, ...}. Save id.

2. Poll status

bash

curl -s "https://api.finalscout.com/v1/find/bulk/status?id=<id>" \
  -H "Authorization: $FINALSCOUT_API_KEY"

Poll every 5 seconds; report progress as finished / total. Task status: Queued → Running → Completed or Failed.

3. Dump results (after Completed)

bash

curl -s "https://api.finalscout.com/v1/find/bulk/dump?id=<id>&page_size=100" \
  -H "Authorization: $FINALSCOUT_API_KEY"

Response: {cursor, task: {id, status}, items: [{contact, meta_data}]}. If cursor is non-empty, request the next page with &cursor=<cursor>; repeat until cursor is null/empty. page_size range 10–100 (default 50). Cursors expire after 1 day.

4. Present results

Name	Input	Email	Type	Status	Score
Bill Gates	microsoft.com	[e-mail]	Work email	Valid	95
...	...	no email found	-	-	-

Summary line: X / Y emails found. Z credits consumed, W credits remaining.

CSV export (optional)

When the user wants a file instead of (or in addition to) inline results:

bash

curl -s "https://api.finalscout.com/v1/find/bulk/export?id=<id>" \
  -H "Authorization: $FINALSCOUT_API_KEY"

Response: {"status": "Generating download link" | "Ready", "download_url": "..."}. If still generating, retry after a few seconds until Ready. Warn the user: the link is public (anyone with it can download) and expires after 7 days.

---

Account info

bash

curl -s https://api.finalscout.com/v1/account \
  -H "Authorization: $FINALSCOUT_API_KEY"

Returns owner_email, credits_available, and per-endpoint rate_limit entries. Use this to check the balance before large bulk jobs or to diagnose 429s.

---

Webhooks

Pass webhook_url in any find request to get HTTP POST callbacks instead of / in addition to polling:

• single_task.finished — single find completed. Contains contact when an email was found, otherwise a message; plus task_id, credits_consumed, meta_data.
• bulk_task.finished — bulk task completed. Task-level summary (total, finished, success, duplicated, credits_consumed, credits_available); no per-contact meta_data at this level.
• contact.change — sent during bulk tasks for each contact whose email is found (or when an existing contact is updated). Contains contact and that contact's meta_data. Nothing is sent for contacts with no email found.

Bulk requests can filter events with webhook_subscribe_events (array of the two bulk event names); if unset, all events are sent.

---

Interpreting results

Contact fields that matter most:

• email + email_status: Valid (safe to send), Risky, Invalid, Unknown. Only Valid is guaranteed deliverable; show Risky/Unknown emails with a caveat.
• email_type: Work email, Personal email, or Generic email.
• email_score (0–100): deliverability confidence; higher is better.
• email_is_catchall: domain accepts all mail; FinalScout's verification (via BounceBan) still makes these as reliable as standard addresses — mention it, don't discard.
• No contact in a single find response (or a contact without email) → no email found; no credit charged.
• Enrichment extras when available: title, company, location, linkedin, website, industry, company_domain, company_phone, company address fields, etc. Include them if the user asked for enrichment.

Always surface credits_consumed and credits_available after an operation.

---

Error handling

HTTP status	Meaning	Action
400	Invalid parameter	Fix the request body/params; re-check required fields
401	Bad/missing API key	Ask the user to check FINALSCOUT_API_KEY (and IP whitelist at finalscout.com/app/api/settings)
403	Insufficient credits	Report credits_required vs credits_available from the response body
405	Account blocked	Tell the user to contact [e-mail]
408	Waterfall timeout (waterfall endpoints only)	Task still running — resubmit the same request or poll /v1/find/single/status
429	Rate limited	Wait 2 seconds and retry once; if repeated, slow down (limits via /v1/account)
500	Server error	Retry once; if it fails again, report the error

Rate limits (typical defaults — actual values via /v1/account)

Endpoint	Limit
/find/linkedin/single	50 / second
/find/author/single, /find/professional/single	5 / second
/find/single/status, /find/bulk/status, /find/bulk/export	25 / second
/find/*/bulk (all three)	2 / second
/account	5 / second

Credits

Universal credits: each email successfully found costs 1 credit, regardless of method. No charge when no email is found. Need test credits or higher limits → [e-mail].