API review

Bouncer API review

EU-based email verification API with real-time, async batch and synchronous batch modes, domain checks, a per-email toxicity score and an official remote MCP server. Best for high-volume batch verification with clear published rate limits.

Verified 25 Oct 2026 · 13 endpoints listed · Official MCP server

See pricing

Bouncer API docs

What a call costs

The actions you pay for, as Bouncer prices them in credits.

Action	Cost	Per
Verify email (real-time or batch)	$0.008 (1K) to $0.002 (1M)	per credit
Verify domain	1 credit	per domain
Duplicates and unknown results	0	per email
Minimum purchase	1,000 credits ($8)	order

Pricing, plan by plan

US dollars, as Bouncer's pricing page shows them on 25 Oct 2026. Monthly and annual billing are shown apart.

Free tier 100 free credits to start; sandbox addresses are free

Pay as you go 1,000

One-off pack

1,000 credits for $8 ($0.0080/credit)

API included

Plan details

credits never expire; >1,000,000 = contact sales

Pay as you go 5,000

One-off pack

5,000 credits for $35 ($0.0070/credit)

API included

Plan details

credits never expire; >1,000,000 = contact sales

Pay as you go 10,000

One-off pack

10,000 credits for $60 ($0.0060/credit)

API included

Plan details

credits never expire; >1,000,000 = contact sales

Pay as you go 50,000

One-off pack

50,000 credits for $250 ($0.0050/credit)

API included

Plan details

credits never expire; >1,000,000 = contact sales

Pay as you go 100,000

One-off pack

100,000 credits for $400 ($0.0040/credit)

API included

Plan details

credits never expire; >1,000,000 = contact sales

Pay as you go 250,000

One-off pack

250,000 credits for $750 ($0.0030/credit)

API included

Plan details

credits never expire; >1,000,000 = contact sales

Show all 13 plansShow fewer plans

Pay as you go 500,000

One-off pack

500,000 credits for $1,250 ($0.0025/credit)

API included

Plan details

credits never expire; >1,000,000 = contact sales

Pay as you go 1,000,000

One-off pack

1,000,000 credits for $2,000 ($0.0020/credit)

API included

Plan details

credits never expire; >1,000,000 = contact sales

Monthly Subscription (auto-refill)

Price not verified

monthly verification credits at volume prices

API included

Plan details

prices not shown in static HTML (shown after choosing a volume); auto-refill available

Deliverability Kit Starter

$25/mo

billed monthly

250 test emails, 10 IPs/domains monitored (inbox placement, blocklist, SPF/DKIM/DMARC, SpamAssassin)

Deliverability Kit Standard

$125/mo

billed monthly

1,000 test emails, 25 IPs/domains

Deliverability Kit Pro

$250/mo

billed monthly

2,500 test emails, 50 IPs/domains

Deliverability Kit Enterprise

Custom quote

Custom: unlimited test emails, unlimited IPs/domains, multi-organisation set-up, dedicated account manager

Ladder rendered headless from the pricing page. October 2026 promo banner: 30% more credits on pay-as-you-go purchases until 31 Oct. Re-fetched live 2026-10-25 (plain Python, USD): PAYG ladder and Deliverability Kit prices unchanged; in-app purchase page (hands-on) shows the same USD ladder. Bouncer Shield (form verification) has its own monthly ladder on the page, not captured as plans because the static HTML pairing of volumes and prices is ambiguous.

Rate limits

Real-time verify 1,000/min (default, raisable); domain 1,000/min; credits 10/min; batch create 60 batches/min + 200 req/min to other batch endpoints; batch sync 100 req/min (up to 10,000 emails per request); toxicity 10 lists/min.

How to get an API key

Bouncer uses API key. The steps below follow Bouncer's own docs.

Create a Bouncer account. API access starts on the Pay as you go 1,000 plan.
Sign up, open API in the left menu, click Generate API Key
Send it with every request: header x-api-key, or HTTP Basic with the key as password.
Make a first call: Verify one email in real time. Keep the key in an environment variable, never in the command.
```
curl -X GET "https://api.usebouncer.com/v1.1/email/verify" \
  -H "x-api-key: $BOUNCER_API_KEY"
```

Where the docs live

What	Where
Documentation	docs.usebouncer.com/introduction
API reference	docs.usebouncer.com/api-reference/real-time/verify-email
llms.txt	docs.usebouncer.com/llms.txt
Base URL	`https://api.usebouncer.com`
MCP server	`https://api.usebouncer.com/mcp`

Strengths and limits

Where it fits

High-volume batch verification with clear published rate limits (100-200k emails/hour default)
Agent workflows: official remote MCP at api.usebouncer.com/mcp
Recovering credits on stalled batches (finish endpoint refunds unverified emails)

Where it falls short

Email finding (verification only in the API)
Buying under 1,000 credits (minimum purchase)

Worth knowing

Real-time verification gives more 'unknown' results on slow SMTP servers (>40 s); use batch for lists.
Keep fewer than ~10 active batches in flight (vendor pseudocode) and respect 60 batch creations/min.
Credits endpoint is limited to 10 requests/minute: do not poll it per email.
Call /finish on a stuck batch to get credits back for unverified emails.
The openapi.yml links in llms.txt return 404; the spec is only embedded page by page.

4 moreShow fewer

Minimum purchase is 1,000 credits; pricing is per pack, not per email.
Batch sync keeps a 24 h cache; the same email sent after 24 h is verified and charged again.
Batches are processed sequentially per account: a 1,000-email batch waits behind a 100,000-email one.
Base URL host api.usebouncer.com; paths carry the version. Other hosts: api.usebouncer.com/v1.1 (toxicity endpoints under /v1)

Who should use it

Use Bouncer for: High-volume batch verification with clear published rate limits (100-200k emails/hour default)
Look elsewhere for: Email finding (verification only in the API)

If Bouncer is not the answer

Other Verification tools in this directory, each with its own review.

MillionVerifier

Verification

Best for cheapest bulk cleaning of large lists.

MillionVerifier API review

NeverBounce

Verification

From $49/mo

Best for bulk list cleaning through async jobs with callbacks.

NeverBounce API review

ZeroBounce

Verification

Free planOfficial MCP

Best for verifying every address before it enters a sequencer.

ZeroBounce API review

Before you build

Four things to settle first, each read off Bouncer's own pages.

Confirm the API is on your planAPI access starts on the Pay as you go 1,000 plan. Free tier: 100 free credits to start.
Keep the key out of your codeAPI key. It is sent as: header x-api-key, or HTTP Basic with the key as password.
Design around the rate limitReal-time verify 1,000/min (default, raisable); domain 1,000/min; credits 10/min; batch create 60 batches/min + 200 req/min to other batch endpoints; batch sync 100 req/min (up to 10,000 emails per request); toxicity 10 lists/min.
Know the catch before you scaleReal-time verification gives more 'unknown' results on slow SMTP servers (>40 s); use batch for lists.

Want us to build it for you?

Tell us what you want Bouncer to do in your stack. We will show you how we would wire it into your data, outbound or CRM, and what we would check first.

Book a call

See case studies

Read from usebouncer.com/pricing, docs.usebouncer.com/api-reference/real-time/verify-email and docs.usebouncer.com/api-reference/batch/batch-create. Verified 25 Oct 2026.

All 13 endpointsFor developers: method, path, what it does and what it costs.

Base URL: api.usebouncer.com

Bulk and async: Yes: async batch (up to 100k per batch), synchronous batch, and toxicity list jobs

Webhooks: Batch create accepts an optional 'callback' query parameter (URL) for completion notification.

Filter endpoints

13 endpoints

Method	Path	What it does	Cost
GET	`/v1.1/email/verify`	Verify one email in real time	1 credit; 'unknown' results are not charged (pricing page, not the endpoint docs)
POSTasync	`/v1.1/email/verify/batch`	Create an async batch (JSON array or txt file)	1 credit per email; duplicates and 'unknown' not charged (pricing page)
GETasync	`/v1.1/email/verify/batch/{batchId}`	Batch status	free
GETasync	`/v1.1/email/verify/batch/{batchId}/download`	Batch results (JSON/CSV), filterable by status	free
POSTasync	`/v1.1/email/verify/batch/{batchId}/finish`	Finish a batch early and return credits for unverified emails	refunds credits for remaining emails
DELETE	`/v1.1/email/verify/batch/{batchId}`	Delete a batch and its results	free
POST	`/v1.1/email/verify/batch/sync`	Synchronous batch queue: each request adds emails to a processing queue and returns once results are known; no batch id to track	1 credit per email; results cached 24 h, after which the same email is verified and charged again
GET	`/v1.1/domain`	Verify a domain (MX, catch-all behaviour, disposable, free provider)	1 credit
GET	`/v1.1/credits`	Available credits	free
POSTasync	`/v1/toxicity/list`	Create a toxicity list job (returns a toxicity score per email; the docs do not define what drives the score)	credits per email (example error: 'not enough credits, 2 required')
GETasync	`/v1/toxicity/list/{id}`	Toxicity job status	free
GETasync	`/v1/toxicity/list/{id}/data`	Download toxicity results	free
DELETE	`/v1/toxicity/list/{id}`	Delete a toxicity job	free