How Address Verification APIs Are Priced (2026)
Six pricing models, public prices at three volumes, and the costs that do not show up on the pricing page.
Address verification APIs are priced per lookup. In this comparison we group vendor pricing into six common models: metered usage, monthly tiers, subscription blocks, a plan plus overage, credits, or bundling with another product. At 10,000 US lookups a month, the published plans and overage calculations in this comparison range from $12 to $250. At 1 million a month, several vendors do not publish a directly comparable monthly price.
We are sthan.io, one of the vendors in the table. Every underlying price below comes from the vendor's own public pricing page, read on the date shown. Where a figure is calculated from a published plan and overage rate, we label it as our calculation. Prices change, so check the source before you decide. Spot an error about your product? Email [email protected] and we will review and correct it.
The six pricing models
| Model | How it works | Examples | Watch for |
|---|---|---|---|
| Metered usage | Usage-based pricing per 1,000 calls, sometimes with an annual commitment | Google; Radar | No ceiling on the bill |
| Monthly tiers | A fixed monthly price for a set number of lookups | sthan.io | Rate limits per tier |
| Subscription blocks | Buy a fixed allocation of lookups for a monthly or yearly term; renew or buy another block when it runs out | Smarty | Requests get a 402 error when the block runs out, unless auto-renew buys another |
| Plan plus overage | Monthly fee with lookups included, extra lookups billed | PostGrid, Lob | Overage rate, base fees |
| Credits | Buy credits, each lookup uses one or more | Melissa, Loqate | Credits per address, expiry |
| Bundled | Included with another product purchase | EasyPost, with shipping labels | Standalone use is charged: EasyPost bills $0.02 per domestic verification not tied to a shipment |
Public prices at 10K, 100K and 1M lookups a month
US address verification, monthly cost in US dollars. Where no plan matches the volume exactly, we show the cheapest listed option that covers it.
| Vendor | Free | 10K / month | 100K / month | 1M / month |
|---|---|---|---|---|
| sthan.io | 3,000 / month (up to 100 a day) | $12 | $65 | $300 |
| PostGrid | 500 free credits | $45 | $475 (Growth $225 + overage) | $4,975 if Growth overage is extrapolated (our math); Enterprise by quote |
| Google Address Validation Pro | 5,000 billable events / month | $85 | $1,615 | $12,155 |
| Smarty (Professional, billed monthly) | 1,000 lookups in a 42-day free trial | $88 | $485 (smallest monthly plan that covers it: 170K) | No 1M/month plan published; 2M a year is $4,980 |
| Lob | Developer plan: no subscription fee, $0.05 per US verification | $250 at Startup-plan verification rates: $25 a month for 1,000, then $0.025 each (our math); the Startup mail plan itself starts at $260 a month | $900 (Growth $450 + overage, our math) | $9,000 if Growth overage is extrapolated (our math); Enterprise by quote |
| Radar | No free tier | About $20 at the starting rate | About $200 at the starting rate | About $2,000 at the starting rate; annual commitment, quote-based |
| Melissa | Up to 1,000 credits / month after a one-time $4.97 identity-check fee | Melissa's price varies by API and credit use, so it has no directly comparable monthly figure. Its pricing pages list credit packs of $40 for 10K, $350 for 100K and $3,200 for 1M credits; its US pay-as-you-go card lists 10 credits per address, and its developer credit table lists 3 for a US check through Personator. Melissa also lists a US yearly subscription from $5,145 for 1M records. | ||
| Loqate | 45-day free trial | Address Verify listed as price on application on every pack; the per-lookup prices Loqate publishes are for Address Capture, its autocomplete product, not verification | ||
| EasyPost | Free with each label purchase | $0.02 per domestic verification and $0.06 per international verification when not associated with an EasyPost shipment, per EasyPost's billing FAQ updated May 11, 2026. At the domestic rate, 10K standalone verifications is $200, 100K is $2,000 and 1M is $20,000 (our math) | ||
Our math: the Lob and PostGrid figures marked "our math" are calculated from each vendor's published plan price and overage rate; they are not quotes from those vendors.
Pricing note: these figures are not perfectly like for like. Google meters billable events, sthan.io and Smarty sell monthly capacity, PostGrid and Lob add overage to a plan, and Radar sells annual commitments priced by quote. Where no plan matches a volume exactly, the figure is the smallest published plan that covers it, or our overage math.
What stands out: at 10K a month the spread is about 20 times, from $12 to $250. At 1M a month, several vendors do not publish a directly comparable monthly price. On pay-as-you-go, Google gets expensive fast once past its 5,000 free billable events a month, and its Enterprise SKU costs more again: $225 at 10K and $17,975 at 1M. Google also sells a Pro subscription plan, the only Google subscription that includes Address Validation: $1,200 a month for 250,000 combined calls, cheaper than pay-as-you-go above about 76,000 requests a month if nothing else on the account uses the allowance.
Questions to ask before you buy
- What does one US lookup cost at my real monthly volume, including overage?
- What happens at the limit: overage, throttling, or a hard stop?
- Do unused lookups or credits expire?
- Is there a base or platform fee on top?
- What is the request-per-minute cap on my tier?
- Do I need CASS certification for my use? It depends on how the addresses will be used. The postal rules require CASS-certified matching for mailings that claim automation prices; using an address validation API for checkout, signup or CRM cleanup does not by itself require it. Seedo you need CASS certification.
Frequently Asked Questions
Sources
All read September 27, 2026: sthan.io/pricing/united-states, smarty.com/pricing/us-address-verification, developers.google.com/maps/billing-and-pricing/pricing, postgrid.com/pricing-address-verification, melissa.com/pricing, loqate.com/en-us/pricing, lob.com/pricing, easypost.com/address-verification-api and the EasyPost Billing and Payments support article (read September 28, 2026), radar.com/pricing.
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