Lob Address Verification

Best for: Prototypes and side projects - free to start, no sales call; Regulated or enterprise workloads - compliance attestations and an enterprise plan; Teams needing broad API coverage out of the box

• ████░░░░░░
  40 / 100
  Agent friendliness
• ██████████
  100 / 100
  Pricing transparency
• ██████████
  100 / 100
  Setup speed
• █▒░░░░░░░░
  15 / 100
  Docs quality
• ██████████
  100 / 100
  Procurement ease
• █████████░
  90 / 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

Hybrid (base + usage) [2]lob.com/pricing/address-verification-domestic“Developer Plan - US: $0.05 per additional verification; Startup Plan; Growth Plan; Enterprise Plan”help.lob.com/address-verification/ready-to-start-av/av-pricing“Startup: $20 annually or $25 monthly, 1,000 requests included... Business: $100 annually or $120 monthly, 10,000 requests included... Growth: $390 annually or $450 monthly, 50,000 requests included”

Published pricing

✓ Yes [3]lob.com/pricing/address-verification“Developer Plan: Free; Startup Plan: $260/mo; Growth Plan: $550/mo; Enterprise Plan: Custom pricing”help.lob.com/address-verification/ready-to-start-av/av-pricing“Startup: $20 annually or $25 monthly, 1,000 requests included... Business: $100 annually or $120 monthly, 10,000 requests included... Growth: $390 annually or $450 monthly, 50,000 requests included”

Free tier

✓ Yes [4]help.lob.com/address-verification/av-faqs“Lob offers 300 free live Address Verification API requests per month to the /v1/us_verifications endpoint. After the first 300 verification requests, you will begin receiving errors with status code 403.”help.lob.com/address-verification/ready-to-start-av/av-pricing“Developer: Free ($0/month), 300 requests included”

Free tier details

Developer plan: 300 free live US address verification API requests per month at no cost; international verification not included in Developer free tier.

Self-serve signup

✓ Yes [5]lob.com/products/address-verification“Try For Free signup option available; Self-serve signup: Direct registration at dashboard.lob.com/register”

Requires sales call

✗ No

Enterprise plan

✓ Yes [6]help.lob.com/address-verification/ready-to-start-av/av-pricing“Enterprise: Custom pricing available”

• USPS CASS certified
• International coverage
• Address autocomplete
• Bulk / batch

Supported actions

verify_address, autocomplete, bulk_verify, reverse_geocode, zip_lookup, dpv_check, standardize, international_verify, av_elements [7]help.lob.com/address-verification/ready-to-start-av/us-av-product-suite“US Verifications - Validate, automatically correct, and standardize US domestic addresses; US Autocomplete - Returns up to 10 address suggestions; Reverse Geocode Lookup; Zip Lookups; AV Elements”

Regions

United States (all 50 states, DC, Puerto Rico, US Virgin Islands, Guam, American Samoa, Armed Forces APO/FPO), 240+ global territories (international verification), USPS CASS Cycle O certified [8]lob.com/products/address-verification“International: Coverage across more than 240 global territories”help.lob.com/address-verification/ready-to-start-av/us-av-product-suite“Lob's Address Verification API validates over 156 million US domestic addresses using CASS (Coding Accuracy Support System) Certified standards.”

Languages

English (default), Native language output via x-lang-output parameter (configurable transliteration) [9]lob.com/blog/international-address-verification-enhancements“configurable transliteration provides Address Verification customers greater flexibility when operating around the world, ensuring addresses are correct and deliverable while providing optionality for the address response to be in the native language”

Input types

structured address components (recipient, street address, city, state, ZIP code, country), partial address string (for autocomplete), latitude/longitude coordinates (for reverse geocode), ZIP code (for zip lookup)

Output types

standardized address, deliverability/validity codes, DPV flags (dpv_active), CMRA flags, geocode (latitude/longitude), carrier route, delivery point barcode, Lob confidence score (0-100), vacancy status, building type, county, residential/business indicator, coverage level (international), JSON

Webhooks

✗ No [10]help.lob.com/print-and-mail/getting-data-and-results/using-webhooks“webhooks are an easy way to get proactive alerts or notifications on events that are happening within Lob, including the tracking events we receive from the USPS”

Sandbox / test mode

✓ Yes [11]help.lob.com/account-management/api-keys“Requests made with Test API key always validate request arguments, simulate live environment behavior, and enforce rate limits, but for verification services, will never verify addresses.”help.lob.com/account-management/api-keys“Test API keys are always prefixed with test_... for verification services, will never verify addresses... the API will only return a sample address”

SDK languages

TypeScript/Node.js, Python, Ruby, PHP, Java, C#/.NET, Go, Elixir [12]lob.com/products/address-verification“CURL, TypeScript, Node, Ruby, Python, PHP, Java, Elixir, C#”

MCP server

✗ No

SOC 2

SOC 2 Type II [13]lob.com/blog/what-certifications-should-you-look-for-in-a-direct-mail-provider“At Lob, we hold SOC 2 Type II and HIPAA certifications.”lob.com/security“We also complete annual SOC 2 Type 2 audits across all five Trust Services Criteria”

HIPAA

✓ Yes [14]lob.com/blog/what-certifications-should-you-look-for-in-a-direct-mail-provider“At Lob, we hold SOC 2 Type II and HIPAA certifications.”lob.com/security“Lob supports healthcare organizations handling protected health information through Business Associate Agreements (BAAs), HIPAA/HITECH privacy audits”

GDPR

✓ Yes [15]lob.com/security“GDPR & CCPA/CPRA: The platform aligns with these regulatory frameworks through security practices designed to meet requirements.”

ISO 27001

✓ Yes [16]lob.com/blog/how-to-choose-award-winning-direct-mail-providers-in-2025“Lob was recognized by USPS as Mail Service Provider of the Year in 2024, and we maintain SOC 2 Type II and ISO/IEC 27001 compliance.”

PCI DSS

– Unknown

Published SLA

✓ Yes [17]lob.com/sla“Lob commits to a monthly uptime threshold of 99.9%. If actual uptime falls below this level, customers become eligible for service credits ranging from 10-20% of their monthly recurring subscription fees.”lob.com/sla“Covered Lob Services means Lob's Print and Mail service ('PMS') and Lob's Address Verification service ('AVS').”

Rate limits

Single address endpoints (US and international): 300 API calls per 5-second interval. US bulk verifications: 70 API calls per 10-second interval, maximum 20 addresses per call. International bulk verifications: 30 API calls per 10-second interval, maximum 20 addresses per call. [18]help.lob.com/address-verification/av-faqs“Single address endpoints: 300 API calls per 5 second interval. US bulk verifications: 70 API calls per 10 second interval, passing a maximum of 20 addresses. International bulk verifications: 30 API calls per 10 second interval, passing a maximum of 20 addresses.”

Known restrictions

US autocomplete not available for non-US addresses (international autocomplete not yet released), Test API key returns only a sample address and does not actually verify addresses, Developer free tier limited to 300 US verifications/month; no included international verifications, International verification coverage depth varies by country, Enterprise pricing requires contacting sales [19]help.lob.com/account-management/api-keys“for verification services, will never verify addresses... the API will only return a sample address”help.lob.com/address-verification/ready-to-start-av/international-av-suite“International address autocompletion for non-US addresses is not currently available”

• Docs
• Status page

Docs rendering: static

API style

rest

Base URL

https://api.lob.com/v1

Version

1.22.0

Versioning

url

Stability

ga

Auth methods

basic

Idempotency keys

✓ Yes

Error format

vendor-specific

Webhook signing

HMAC-SHA256

Rate limit

300 / 5 seconds

SDKs

• TypeScript/Node.js @lob/lob-typescript-sdk · repo
• Python lob_python · repo
• Ruby lob · repo
• PHP lob/lob-php · repo
• Java lob-java · repo
• C#/.NET lob.dotnet · repo
• Go · repo
• Elixir · repo

• Auth docs
• Quickstart
• Webhook events

Launched

2013-01-01

GA

2017-05-31

Notable customers

Current, CareWell, BlueChip Financial

• Loqate Address Verification

  "Global address verification that ensures you reach your customers, every time."

  Usage · public pricing · self-serve

• PostGrid Address Verification

  "Autocomplete, Verify, Validate, and Standardize addresses across 250+ countries & territories to local postal standards"

  Hybrid · public pricing · self-serve

• Melissa

  Global data quality and enhancement solutions to profile, verify, clean, update, match, and integrate People data.

  Hybrid · free tier · public pricing · self-serve

• Smarty (US & International Address Verification)

  "Address data on easy mode"

  Subscription · public pricing · self-serve

• Service Objects DOTS Address Validation

  "Maximize Address Accuracy and Deliverability"

  Sales-led · self-serve

• Precisely Verify (Address Verification)

  "Deliver accurate, consistent, contextual data to your business - wherever and whenever it's needed."

  Sales-led · self-serve

Lob Address Verification alternatives · Lob Address Verification vs Loqate Address Verification · All Address Validation APIs APIs

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

1. ↑Description: lob.com
2. ↑Pricing model: lob.com · help.lob.com
3. ↑Published pricing: lob.com · help.lob.com
4. ↑Free tier: help.lob.com · help.lob.com
5. ↑Self-serve signup: lob.com
6. ↑Enterprise plan: help.lob.com
7. ↑Supported actions: help.lob.com
8. ↑Regions: lob.com · help.lob.com
9. ↑Languages: lob.com
10. ↑Webhooks: help.lob.com
11. ↑Sandbox: help.lob.com · help.lob.com
12. ↑SDK languages: lob.com
13. ↑SOC 2: lob.com · lob.com
14. ↑HIPAA: lob.com · lob.com
15. ↑GDPR: lob.com
16. ↑ISO 27001: lob.com
17. ↑Published SLA: lob.com · lob.com
18. ↑Rate limits: help.lob.com
19. ↑Known restrictions: help.lob.com · help.lob.com

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

1. 2026-06-15 Score Agent Friendliness: 20 → 40
2. 2026-06-14 Robots Allows Agents: (none) → Yes
3. 2026-06-14 Has Structured Data: (none) → Yes
4. 2026-06-14 Capabilities: {} → {"bulk":true,"autocomplete":true,"international":true,"cass_certified":true}
5. 2026-06-14 Summary Md: (none) → Lob Address Verification is a REST API for validating, standardizing, and autoc…
6. 2026-06-14 Score Trust Readiness: (none) → 90
7. 2026-06-14 Best For: (none) → Prototypes and side projects - free to start, no sales call, Regulated or enter…
8. 2026-06-14 Scoring Methodology: (none) → Scores are computed deterministically from this profile's published, sourced fi…
9. 2026-06-14 Score Docs Quality: (none) → 15
10. 2026-06-14 Score Agent Friendliness: (none) → 20
11. 2026-06-14 Score Pricing Transparency: (none) → 100
12. 2026-06-14 Score Setup Speed: (none) → 100
13. 2026-06-14 Score Procurement Friction: (none) → 100
14. 2026-06-14 Llms Txt Present: (none) → No
15. 2026-06-14 Docs URL: (none) → https://docs.lob.com
16. 2026-06-14 Status Page URL: (none) → https://status.lob.com
17. 2026-06-14 Rendering: (none) → static
18. 2026-06-14 Has Published Pricing: set to Yes
19. 2026-06-14 Free Tier Available: set to Yes
20. 2026-06-14 Free Tier Details: set to Developer plan: 300 free live US address verification API requests per month at…
21. 2026-06-14 Self Serve Signup: set to Yes
22. 2026-06-14 Requires Sales Call: set to No
23. 2026-06-14 Enterprise Plan Available: set to Yes
24. 2026-06-14 SOC 2: set to type_2
25. 2026-06-14 HIPAA: set to Yes
26. 2026-06-14 GDPR: set to Yes
27. 2026-06-14 ISO 27001: set to Yes
28. 2026-06-14 SLA Published: set to Yes
29. 2026-06-14 SLA URL: set to https://www.lob.com/sla
30. 2026-06-14 Data Retention Policy URL: set to https://help.lob.com/resources/data-retention
31. 2026-06-14 Documented Rate Limits: set to Single address endpoints (US and international): 300 API calls per 5-second int…
32. 2026-06-14 Rate Limit Requests: set to 300
33. 2026-06-14 Rate Limit Window: set to 5 seconds
34. 2026-06-14 Known Restrictions: set to US autocomplete not available for non-US addresses (international autocomplete …
35. 2026-06-14 Auth Methods: set to basic
36. 2026-06-14 Auth Docs URL: set to https://help.lob.com/account-management/api-keys
37. 2026-06-14 API Style: set to rest
38. 2026-06-14 Base URL: set to https://api.lob.com/v1
39. 2026-06-14 API Version: set to 1.22.0
40. 2026-06-14 Versioning Scheme: set to url
41. 2026-06-14 Stability: set to ga
42. 2026-06-14 Quickstart URL: set to https://help.lob.com/developer-docs/api-quickstart-guide
43. 2026-06-14 Idempotency Supported: set to Yes
44. 2026-06-14 Error Format: set to vendor-specific
45. 2026-06-14 Webhook Signing: set to HMAC-SHA256
46. 2026-06-14 Webhook Events URL: set to https://docs.lob.com/#tag/Webhooks
47. 2026-06-14 Slug: set to lob-av
48. 2026-06-14 Starting Price Usd: set to 0.025
49. 2026-06-14 Price Basis: set to 1,000 lookups
50. 2026-06-14 Free Tier Limit: set to 300 live US verification requests/month without payment method; unlimited test-…

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