# Interzoid, free, API key, GET /emailtrustscore: Cached email verification API

> Evaluate email address quality with intelligent scoring from 0-99 for sales prospecting, lead qualification, triggering business processes, determining options for free trials, and anti-fraud protection.

Interzoid's cached email verification API on its Free API key plan. It costs $0.00 per 1,000 emails. It returns 3 of the 6 key fields we check: Address, Deliverability, Confidence.
The cheapest of the 291 plans we rank by price is [EnvoAPI, $29 pack](https://datacircle.dev/cached-email-validation-apis/envoapi/29-pack/llms.txt). EnvoAPI's cached email verification API costs nothing beyond the plan price.

- This page: https://datacircle.dev/cached-email-validation-apis/interzoid/free-api-key-get-emailtrustscore
- [Best cached email verification API in 2026](https://datacircle.dev/best-cached-email-verification-api.txt)
- Get it: https://docs.interzoid.com/entries/api-license-keys
- Its API docs: https://www.interzoid.com/apis/email-trust-score
- Sold by: Interzoid (https://www.interzoid.com)
- Checked: 2026-10-21

## In the answer

- Completeness: 50%
- Address: ✓
- Deliverability: ✓
- Confidence: ✓

## Price

- $ per 1,000 emails: $0.00
- Per: call
- Billing: free

## Aggregators

- Aggregators: none

## Charges

- Also pays for: from the same budget: 56 other calls

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Evaluate email address quality with intelligent scoring from 0-99 for sales prospecting, lead qualification, triggering business processes, determining options for free trials, and anti-fraud protection.

## Data

- Freshness: stored
- Keep data: no limit
- Use data: You may use Service Outputs, including Enrichment Data, in your internal systems, applications, databases, workflows, reports, and business processes, provided that your use complies with these Terms, applicable law, and any applicable purchase, subscription, or usage terms. [...] You may not, and may not permit any third party to: Use the Services for unlawful, fraudulent, deceptive, abusive, harmful, or unauthorized purposes, Use the Services to build, train, benchmark, or improve a competing product or service without Interzoid's written permission, Resell, sublicense, lease, distribute, or provide the Services, Service Outputs, or Enrichment Data as a standalone data product, API, database, feed, or competing service, Scrape, harvest, copy, or bulk extract data from the Services except through authorized API calls or permitted product functionality, Use the Services in violation of privacy, data protection, intellectual property, export control, anti-spam, anti-discrimination, or other applicable laws, Use the Services, Service Outputs, or Enrichment Data to conduct unlawful surveillance, monitoring, tracking, stalking, harassment, intimidation, or doxxing of any individual, or to locate or identify an individual in order to threaten, endanger, harm, defraud, or extort that individual, Use the Services, Service Outputs, or Enrichment Data to re-identify individuals from data that has been anonymized, de-identified, aggregated, or pseudonymized, Use the Services, Service Outputs, or Enrichment Data to circumvent or defeat an individual's opt-out, do-not-contact, do-not-sell, suppression, consent withdrawal, or deletion request, or to reconstruct records that were required to be deleted or suppressed, Use the Services, Service Outputs, or Enrichment Data as a factor in establishing an individual's eligibility for credit, insurance, employment, housing, education, government benefits, or healthcare, or for any other purpose that would cause Interzoid to be considered a consumer reporting agency or Service Outputs to be considered a consumer report under the Fair Credit Reporting Act or any analogous law, Use the Services in any manner prohibited by the Acceptable Use Policy.

## Plan

- Pay: $0

## Rate limit

- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: lookup. Optional: language
- Method: GET
- Path: /emailtrustscore

## About the plan

- Plan: Free API key
- Who can get it: anyone

## The 5 fields the plan's answer can hold

email address, trust score, reasoning, status code, credits remaining

## Interzoid's plans (9)

- [Interzoid, free, API key, GET /emailtrustscore](https://datacircle.dev/cached-email-validation-apis/interzoid/free-api-key-get-emailtrustscore/llms.txt): $0.00 per 1,000, 50% complete, stored
- [Interzoid, pay as you go, x402 pay per call, GET /emailtrustscore](https://datacircle.dev/cached-email-validation-apis/interzoid/pay-as-you-go-x402-pay-per-call-get-emailtrustscore/llms.txt): $250.00 per 1,000, 50% complete, stored
- [Interzoid, $20 monthly, Starter Plan, GET /emailtrustscore](https://datacircle.dev/cached-email-validation-apis/interzoid/20-monthly-starter-plan-get-emailtrustscore/llms.txt): $500.00 per 1,000, 50% complete, stored
- [Interzoid, $99 monthly, 10,000 Credits, GET /emailtrustscore](https://datacircle.dev/cached-email-validation-apis/interzoid/99-monthly-10000-credits-get-emailtrustscore/llms.txt): $247.50 per 1,000, 50% complete, stored
- [Interzoid, $750 monthly, 100,000 Credits, GET /emailtrustscore](https://datacircle.dev/cached-email-validation-apis/interzoid/750-monthly-100000-credits-get-emailtrustscore/llms.txt): $187.50 per 1,000, 50% complete, stored
- [Interzoid, $2,999 monthly, 1 Million Credits, GET /emailtrustscore](https://datacircle.dev/cached-email-validation-apis/interzoid/2999-monthly-1-million-credits-get-emailtrustscore/llms.txt): $74.975 per 1,000, 50% complete, stored
- [Interzoid, $999 yearly, 10,000 Credits (annual), GET /emailtrustscore](https://datacircle.dev/cached-email-validation-apis/interzoid/999-yearly-10000-credits-annual-get-emailtrustscore/llms.txt): $208.125 per 1,000, 50% complete, stored
- [Interzoid, $7,500 yearly, 100,000 Credits (annual), GET /emailtrustscore](https://datacircle.dev/cached-email-validation-apis/interzoid/7500-yearly-100000-credits-annual-get-emailtrustscore/llms.txt): $156.25 per 1,000, 50% complete, stored
- [Interzoid, $30,000 yearly, 1 Million Credits (annual), GET /emailtrustscore](https://datacircle.dev/cached-email-validation-apis/interzoid/30000-yearly-1-million-credits-annual-get-emailtrustscore/llms.txt): $62.50 per 1,000, 50% complete, stored

## Interzoid's calls for this API (2)

- `POST /enrich`: [Interzoid, free, API key, POST /enrich](https://datacircle.dev/cached-email-validation-apis/interzoid/free-api-key-post-enrich/llms.txt)
- `GET /emailtrustscore`: [Interzoid, free, API key, GET /emailtrustscore](https://datacircle.dev/cached-email-validation-apis/interzoid/free-api-key-get-emailtrustscore/llms.txt)

## Interzoid's APIs (8)

- [Interzoid: company enrichment API pricing, 9 plans, POST /enrich, Batch Data Enrichment (business-info)](https://datacircle.dev/company-enrichment-apis/interzoid/free-api-key-post-enrich-batch-data-enrichment-business-info/llms.txt)
- [Interzoid: company enrichment API pricing, 9 plans, POST /enrich, Batch Data Enrichment (business-info-domain)](https://datacircle.dev/company-enrichment-apis/interzoid/free-api-key-post-enrich-batch-data-enrichment-business-info-domain/llms.txt)
- [Interzoid: company enrichment API pricing, 9 plans, POST /enrich, Batch Data Enrichment (industry-codes)](https://datacircle.dev/company-enrichment-apis/interzoid/free-api-key-post-enrich-batch-data-enrichment-industry-codes/llms.txt)
- [Interzoid: company enrichment API pricing, 9 plans, POST /enrich, Batch Data Enrichment (sic-codes)](https://datacircle.dev/company-enrichment-apis/interzoid/free-api-key-post-enrich-batch-data-enrichment-sic-codes/llms.txt)
- [Interzoid: company enrichment API pricing, 9 plans, GET /getbusinessinfo](https://datacircle.dev/company-enrichment-apis/interzoid/free/llms.txt)
- [Interzoid: company enrichment API pricing, 9 plans, GET /getbusinessinfodomain](https://datacircle.dev/company-enrichment-apis/interzoid/free-api-key-get-getbusinessinfodomain/llms.txt)
- [Interzoid: company enrichment API pricing, 9 plans, GET /getindustrycodes](https://datacircle.dev/company-enrichment-apis/interzoid/free-api-key-get-getindustrycodes/llms.txt)
- [Interzoid: company enrichment API pricing, 9 plans, GET /getsiccodes](https://datacircle.dev/company-enrichment-apis/interzoid/free-api-key-get-getsiccodes/llms.txt)
- [Interzoid: similar companies API pricing, 9 plans, POST /enrich](https://datacircle.dev/similar-company-apis/interzoid/free-api-key-post-enrich/llms.txt)
- [Interzoid: similar companies API pricing, 9 plans, GET /getcompetitoranalysis](https://datacircle.dev/similar-company-apis/interzoid/free-api-key-get-getcompetitoranalysis/llms.txt)
- [Interzoid: cached email verification API pricing, 9 plans, GET /emailtrustscore](https://datacircle.dev/cached-email-validation-apis/interzoid/free-api-key-get-emailtrustscore/llms.txt)
- [Interzoid: people search API pricing, 9 plans, POST /enrich](https://datacircle.dev/people-search-apis/interzoid/free-api-key-post-enrich/llms.txt)
- [Interzoid: people search API pricing, 9 plans, GET /getexecutiveprofile](https://datacircle.dev/people-search-apis/interzoid/free-api-key-get-getexecutiveprofile/llms.txt)
- [Interzoid: company hierarchy API pricing, 9 plans, POST /enrich](https://datacircle.dev/company-hierarchy-apis/interzoid/free-api-key-post-enrich/llms.txt)
- [Interzoid: company hierarchy API pricing, 9 plans, GET /getparentcompanyinfo](https://datacircle.dev/company-hierarchy-apis/interzoid/free/llms.txt)
- [Interzoid: phone validation API pricing, 9 plans, POST /enrich](https://datacircle.dev/validate-phone-apis/interzoid/free-api-key-post-enrich/llms.txt)
- [Interzoid: phone validation API pricing, 9 plans, GET /getphoneprofile](https://datacircle.dev/validate-phone-apis/interzoid/free/llms.txt)
- [Interzoid: company funding API pricing, 9 plans, POST /enrich](https://datacircle.dev/company-funding-apis/interzoid/free-api-key-post-enrich/llms.txt)
- [Interzoid: company funding API pricing, 9 plans, GET /getprivatecompanydealintel](https://datacircle.dev/company-funding-apis/interzoid/free/llms.txt)
- [Interzoid: tech stack API pricing, 9 plans, POST /enrich](https://datacircle.dev/company-technology-apis/interzoid/free-api-key-post-enrich/llms.txt)
- [Interzoid: tech stack API pricing, 9 plans, GET /gettechstack](https://datacircle.dev/company-technology-apis/interzoid/free/llms.txt)

## Interzoid: cached email verification API alternatives

- [Elastic Email, $59 monthly, Email Marketing Starter (5,000 contacts), POST /verifications/{email}](https://datacircle.dev/cached-email-validation-apis/elastic-email/59-monthly-email-marketing-starter-5000-contacts-post-verifications-email/llms.txt): $11.80 per 1,000, 50% complete, stored
- [Byteplant, $674.50 pack, One-Time, 50,000 credits, GET /api/verify](https://datacircle.dev/cached-email-validation-apis/byteplant/674-50-pack-one-time-50000-credits-get-api-verify/llms.txt): $13.49 per 1,000, 17% complete, stored
- [Strale, pay as you go, x402 (USDC on Base), GET /x402/email-validate](https://datacircle.dev/cached-email-validation-apis/strale/pay-as-you-go-x402-usdc-on-base-get-x402-email-validate/llms.txt): $32.40 per 1,000, 50% complete, stored
- [Mailgun, $400 monthly, Scale, 500,000 emails a month, 5,000 validations included, GET /v4/address/validate](https://datacircle.dev/cached-email-validation-apis/mailgun/400-monthly-scale-500000-emails-a-month-5000-validations-included-get-v4-address-validate/llms.txt): $80.00 per 1,000, 33% complete, stored

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-10-21.

- https://api.interzoid.com/openapi.json
- https://docs.interzoid.com/entries/api-license-keys
- https://www.interzoid.com/api
- https://www.interzoid.com/api-acceptable-use
- https://www.interzoid.com/api-pricing
- https://www.interzoid.com/api-terms-use
- https://www.interzoid.com/apis/email-trust-score
- https://www.interzoid.com/services/api-pricing