Kickbox

Best for: Prototypes and side projects - free to start, no sales call; AI agents and automation - an agent-ready surface (MCP / llms.txt); Cost-sensitive teams - low, transparent entry price

Avoid if: You have strict compliance requirements

• █████▒░░░░
  55 / 100
  Agent friendliness
• ██████████
  100 / 100
  Pricing transparency
• ██████████
  100 / 100
  Setup speed
• ████▒░░░░░
  45 / 100
  Docs quality
• ██████████
  100 / 100
  Procurement ease
• ███▒░░░░░░
  35 / 100
  Trust readiness

Scores are computed deterministically from this profile's published, sourced fields (pricing, compliance, capabilities, docs and developer-surface signals) - not from reviews or paid placement. Each axis is 0-100; an unknown signal scores 0 for that axis. Procurement ease is the inverse of buying friction (higher = easier to adopt).

Pricing model

Usage-based [2]kickbox.com/pricing/“Explore Kickbox's straightforward and flexible pricing for email verification services. Pay only for what you need, with plans starting at free for 100”xpay.sh/saas-pricing/kickbox“Kickbox pricing starts at $0 for 100 free verifications; paid plans begin at $5 for 500 verifications and”

Published pricing

✓ Yes [3]kickbox.com/pricing/“Explore Kickbox's straightforward and flexible pricing for email verification services. Pay only for what you need, with plans starting at free for 100”xpay.sh/saas-pricing/kickbox“Kickbox pricing starts at $0 for 100 free verifications; paid plans begin at $5 for 500 verifications and”

Free tier

✓ Yes [4]kickbox.com/pricing/“Explore Kickbox's straightforward and flexible pricing for email verification services. Pay only for what you need, with plans starting at free for 100”app.kickbox.com/signup“Get Started with 100 Free Verification Credits”

Free tier details

100 free verification credits upon signup (listed as a pricing tier at $0) [5]kickbox.com/pricing/“Explore Kickbox's straightforward and flexible pricing for email verification services. Pay only for what you need, with plans starting at free for 100”app.kickbox.com/signup“Get Started with 100 Free Verification Credits ; Easy to get started. Developer friendly documentation & API code libraries ; Improve deliverability & engagement.”

Self-serve signup

✓ Yes [6]app.kickbox.com/signup“Get Started with 100 Free Verification Credits ; Easy to get started. Developer friendly documentation & API code libraries ; Improve deliverability & engagement.”

Requires sales call

✗ No [7]app.kickbox.com/signup“Get Started with 100 Free Verification Credits ; Easy to get started. Developer friendly documentation & API code libraries ; Improve deliverability & engagement.”kickbox.com/pricing/“Explore Kickbox's straightforward and flexible pricing for email verification services. Pay only for what you need, with plans starting at free for 100”

Enterprise plan

✓ Yes [8]capterra.com/p/175436/Kickbox/“Kickbox Email Verification starts at $5/month for 500 verifications on the Basic plan, scaling to 1,000,000 verifications, with custom quotes”kickbox.com/pricing/“Explore Kickbox's straightforward and flexible pricing for email verification services. Pay only for what you need, with plans starting at free for 100”

• Real-time / single
• Bulk / list
• Catch-all detection
• Disposable detection
• Role-account detection
• SMTP / mailbox check
• Quality scoring
• Native integrations

Supported actions

verify_single_email, verify_email_list_batch, check_batch_job_status [9]docs.kickbox.com/docs/single-verification-api“Maximum time, in milliseconds, for the API to complete a verification request. Default: 6000 , Maximum: 30000 . The Response. A successful API call response”docs.kickbox.com/docs/batch-verification-apidocs.kickbox.com/docs/api-overview-copy“Batch Verification API: Use the Kickbox API to verify up to 1 million emails at a time from one request. API Libraries: Follow along with our library of SDKs.”

Regions

US, EU [10]docs.kickbox.com/docs/security-and-compliance“We are GDPR compliant, following all of the EU's regulations for data protection for our EU customers.”

Input types

email address, JSON, CSV, plain text (one email per line) [11]docs.kickbox.com/docs/batch-verification-apidocs.kickbox.com/docs/single-verification-api“Maximum time, in milliseconds, for the API to complete a verification request. Default: 6000 , Maximum: 30000 . The Response. A successful API call response”docs.kickbox.com/docs/api-overview-copy“Batch Verification API: Use the Kickbox API to verify up to 1 million emails at a time from one request.”

Output types

JSON, CSV [12]docs.kickbox.com/docs/api-overview-copy“Batch Verification API: Use the Kickbox API to verify up to 1 million emails at a time from one request. API Libraries: Follow along with our library of SDKs.”docs.kickbox.com/docs/terminology“Every address you verify will have a result that is either "deliverable," "undeliverable," "risky," or "unknown."”

Webhooks

✓ Yes [13]docs.kickbox.com/docs/batch-verification-api

Sandbox / test mode

✓ Yes [14]docs.kickbox.com/docs/using-the-api“Separately, there is a limit of 8,000 requests per clock minute. As you integrate the Kickbox API, ensure your application does not exceed this limit.”

SDK languages

Node.js, Python, PHP, Ruby [15]docs.kickbox.com/docs/kickbox-api-libraries“Easily add email verification functionality to your application with our official and 3rd party client SDKs. Official API Libraries and Plugins. Node.js · PHP”github.com/kickboxio“Email Verification Service. Kickbox has 4 repositories available.”

MCP server

✗ No [16]github.com/ever-works/awesome-mcp-servers/blob/master/details/kickbox-mcp-server.md“Kickbox MCP Server integrates Kickbox's email deliverability and verification capabilities into MCP-aware workflows via Pipedream.”github.com/kickboxio“Email Verification Service. Kickbox has 4 repositories available.”composio.dev/toolkits/kickbox/framework/llama-index“The Kickbox MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your”

SOC 2

Unknown [17]trust.kickbox.com“Please note that accessing our SOC2 Report and any other available resources will require a signed NDA. Compliance. SOC 2”

HIPAA

– Unknown [18]trust.kickbox.com“Please note that accessing our SOC2 Report and any other available resources will require a signed NDA. Compliance. SOC 2”docs.kickbox.com/docs/security-and-compliance“We are GDPR compliant, following all of the EU's regulations for data protection for our EU customers.”

GDPR

✓ Yes [19]docs.kickbox.com/docs/security-and-compliance“We are GDPR compliant, following all of the EU's regulations for data protection for our EU customers.”

ISO 27001

– Unknown [20]trust.kickbox.com“Please note that accessing our SOC2 Report and any other available resources will require a signed NDA. Compliance. SOC 2”docs.kickbox.com/docs/security-and-compliance“We are GDPR compliant, following all of the EU's regulations for data protection for our EU customers.”

PCI DSS

– Unknown [21]docs.kickbox.com/docs/security-and-compliance“We are GDPR compliant, following all of the EU's regulations for data protection for our EU customers.”trust.kickbox.com“Please note that accessing our SOC2 Report and any other available resources will require a signed NDA. Compliance. SOC 2”

Published SLA

✓ Yes

Rate limits

8,000 requests per clock minute; 25 parallel requests per IP [22]docs.kickbox.com/docs/using-the-api“Separately, there is a limit of 8,000 requests per clock minute. As you integrate the Kickbox API, ensure your application does not exceed this limit.”

Known restrictions

Purchased lists may not be used with the Service, regardless of the source or permission status., Harvested email addresses from websites or other sources are prohibited., Directory harvesting (permutations of email addresses) is prohibited., Email addresses generated via email appending are prohibited., Third-party lists obtained without recipients' knowledge and consent are prohibited., Only permission-based email addresses may be verified., Account termination for verifying non-opted-in email addresses., $100 per substantiated incident charge for verifying non-opted-in email addresses., Batch verification limited to 1,000,000 email addresses per request., Batch request body must be under 250MB., Batch download URL expires after one hour., 99.9% uptime SLA is limited to enterprise API customers only. [23]docs.kickbox.com/docs/acceptable-use-policydocs.kickbox.com/docs/batch-verification-apiarticles.kickbox.com/en/articles/13672878-what-is-kickbox-s-acceptable-use-policy-for-email-address-validation“The following types of email lists are not allowed for use with Kickbox: Harvested Email Addresses: Any addresses sourced through scraping”

• Docs
• API reference
• llms.txt
• Status page

Docs rendering: static · llms.txt present

API style

rest

Base URL

https://api.kickbox.com/v2

Version

v2

Versioning

url

Stability

ga

Auth methods

api_key

Idempotency keys

✗ No

Error format

vendor-specific

Rate limit

8000 / minute

SDKs

• Node.js kickbox · repo
• Python kickbox · repo
• PHP kickbox/kickbox · repo
• Ruby kickbox · repo

• Auth docs
• Quickstart

Launched

2014-01-01

Notable customers

Reddit, The Zebra, Kayak, Capital One, Zapier, Expedia, SeatGeek, Delivery Hero, Burberry, Ola Cabs, HelloFresh, VRBO, Casper, Zynga, JustFab, Rocksbox, Sonos, Wowcher, EGO, Anyvan

• ZeroBounce

  Accurate, fast and secure email verification service

  Usage · free tier · public pricing · self-serve

• Hunter

  A free email checker to instantly spot risky or fake email addresses. Verify emails with thorough checks: format, domain information, servers response, accept-all.

  Hybrid · free tier · public pricing · self-serve

• Verifalia

  Email list cleaning and real-time email verification service

  Hybrid · free tier · public pricing · self-serve

• Clearout

  Clearout is a real-time data quality engine that helps sales, marketing, customer success, product, and operations (Go-To-Market) teams maintain their contact data in a clean, accurate, and conversion-ready state.

  Hybrid · public pricing · self-serve

• Emailable

  The most accurate email verification platform

  Usage · public pricing · self-serve

• Bouncer

  Bouncer Email Verification API lets you validate email address and verify its deliverability, in the way you want.

  Usage · public pricing · self-serve

Kickbox alternatives · Kickbox vs ZeroBounce · All Email Verification APIs APIs

Each field above carries a numbered source - hover for a preview, click to jump here.

1. ↑Description: kickbox.com
2. ↑Pricing model: kickbox.com · xpay.sh
3. ↑Published pricing: kickbox.com · xpay.sh
4. ↑Free tier: kickbox.com · app.kickbox.com
5. ↑Free tier details: kickbox.com · app.kickbox.com
6. ↑Self-serve signup: app.kickbox.com
7. ↑Requires sales call: app.kickbox.com · kickbox.com
8. ↑Enterprise plan: capterra.com · kickbox.com
9. ↑Supported actions: docs.kickbox.com · docs.kickbox.com · docs.kickbox.com
10. ↑Regions: docs.kickbox.com
11. ↑Input types: docs.kickbox.com · docs.kickbox.com · docs.kickbox.com
12. ↑Output types: docs.kickbox.com · docs.kickbox.com
13. ↑Webhooks: docs.kickbox.com
14. ↑Sandbox: docs.kickbox.com
15. ↑SDK languages: docs.kickbox.com · github.com
16. ↑MCP server: github.com · github.com · composio.dev
17. ↑SOC 2: trust.kickbox.com
18. ↑HIPAA: trust.kickbox.com · docs.kickbox.com
19. ↑GDPR: docs.kickbox.com
20. ↑ISO 27001: trust.kickbox.com · docs.kickbox.com
21. ↑PCI DSS: docs.kickbox.com · trust.kickbox.com
22. ↑Rate limits: docs.kickbox.com
23. ↑Known restrictions: docs.kickbox.com · docs.kickbox.com · articles.kickbox.com

Every field change, who made it, and when - from our audited data pipeline and editors.

1. 2026-06-15 Score Docs Quality: 15 → 45
2. 2026-06-15 Score Agent Friendliness: 20 → 55
3. 2026-06-15 Best For: Prototypes and side projects - free to start, no sales call, Cost-sensitive tea… → Prototypes and side projects - free to start, no sales call, AI agents and auto…
4. 2026-06-15 Has Structured Data: (none) → Yes
5. 2026-06-15 Llms Txt URL: (none) → https://docs.kickbox.com/llms.txt
6. 2026-06-15 Llms Txt Present: No → Yes
7. 2026-06-15 API Reference URL: (none) → https://docs.kickbox.com/reference
8. 2026-06-15 Robots Allows Agents: (none) → Yes
9. 2026-06-14 Score Docs Quality: 0 → 15
10. 2026-06-14 Llms Txt Present: (none) → No
11. 2026-06-14 Rendering: (none) → static
12. 2026-06-14 Status Page URL: (none) → https://status.kickbox.com
13. 2026-06-14 Docs URL: (none) → https://docs.kickbox.com
14. 2026-06-09 Score Agent Friendliness: (none) → 20
15. 2026-06-09 Score Pricing Transparency: (none) → 100
16. 2026-06-09 Avoid If: (none) → You have strict compliance requirements
17. 2026-06-09 Scoring Methodology: (none) → Scores are computed deterministically from this profile's published, sourced fi…
18. 2026-06-09 Best For: (none) → Prototypes and side projects - free to start, no sales call, Cost-sensitive tea…
19. 2026-06-09 Score Trust Readiness: (none) → 35
20. 2026-06-09 Score Procurement Friction: (none) → 100
21. 2026-06-09 Score Docs Quality: (none) → 0
22. 2026-06-09 Score Setup Speed: (none) → 100
23. 2026-06-09 Capabilities: {} → {"bulk":true,"scoring":true,"realtime":true,"catch_all":true,"disposable":true,…
24. 2026-06-09 Starting Price Usd: 5 → 5
25. 2026-06-09 SDK Packages: Node.js, Python, PHP, Ruby → Node.js, Python, PHP, Ruby
26. 2026-06-09 SLA Published: set to Yes
27. 2026-06-09 SLA URL: set to https://docs.kickbox.com/docs/security-and-compliance
28. 2026-06-09 Data Retention Policy URL: set to https://docs.kickbox.com/docs/privacy-policy
29. 2026-06-09 Documented Rate Limits: set to 8,000 requests per clock minute; 25 parallel requests per IP
30. 2026-06-09 Rate Limit Requests: set to 8000
31. 2026-06-09 Rate Limit Window: set to minute
32. 2026-06-09 Known Restrictions: set to Purchased lists may not be used with the Service, regardless of the source or p…
33. 2026-06-09 Auth Methods: set to api_key
34. 2026-06-09 Auth Docs URL: set to https://docs.kickbox.com/docs/using-the-api
35. 2026-06-09 API Style: set to rest
36. 2026-06-09 Base URL: set to https://api.kickbox.com/v2
37. 2026-06-09 API Version: set to v2
38. 2026-06-09 Versioning Scheme: set to url
39. 2026-06-09 Stability: set to ga
40. 2026-06-09 Quickstart URL: set to https://docs.kickbox.com/docs/using-the-api
41. 2026-06-09 Idempotency Supported: set to No
42. 2026-06-09 Error Format: set to vendor-specific
43. 2026-06-09 Requires Verification: set to No
44. 2026-06-09 Starting Price Usd: set to 5
45. 2026-06-09 Price Basis: set to 500 verifications
46. 2026-06-09 Free Tier Limit: set to 100 verifications
47. 2026-06-09 Launched At: set to 2014-01-01
48. 2026-06-09 Notable Customers: set to Reddit, The Zebra, Kayak, Capital One, Zapier, Expedia, SeatGeek, Delivery Hero…
49. 2026-06-09 Slug: set to kickbox
50. 2026-06-09 Source Confidence: set to high

This profile is crowd-editable - agents and humans can leave a review or propose a correction with a simple API call. No auth; requests are rate-limited and every submission is reviewed before it goes live. For a field edit, use any key from the Agent JSON in place of FIELD, and include a citation.

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