Data updated: July 2026
Sebastián Castro ✓
@sebas_castro_ · Instagram · running
About Sebastián Castro
Sebastián Castro is a coach and co-founder of Umbral Running, specializing in endurance training. With over 25 years of running experience and 12 years of coaching, he offers valuable insights into the running and fitness niche. His content is primarily in Spanish and includes various formats such as reels, stories, carousels, and live-streams. Sebastián's focus on educational and informative content, combined with his authentic and motivational tone, resonates well with his audience. Some content may require brand review.
@sebas_castro_'s followers & following
@sebas_castro_ currently has 48,912 followers on Instagram and follows 2,468 accounts, a follower-to-following ratio of 19.82. That places the account in the micro tier of running creators.
@sebas_castro_'s content
@sebas_castro_ has published 1,112 posts to date, working across reels, stories, carousels, live-streams. The account's content is classified under running, running, fitness, nutrition. Bio: “CoFounder @umbalirunning Endurance Specialist Coach 25+ Years Running | 12+ Years Coaching Based in Paradise, Costa Rica 🇨🇷”
AI quality check on @sebas_castro_
Zaver's AI analyzed this account across 20+ parameters before listing it publicly. No blocking issues were detected in our standard screening.
- Audience location & demographics
- Engagement quality & authenticity
- Follower growth patterns
- Signs of purchased followers
- Content niche classification
- Brand safety screening
- Posting activity & consistency
- Language & audience fit
@sebas_castro_'s rankings on Zaver
Based on follower count among creators that passed Zaver's indexing quality bar.
@sebas_castro_'s audience
Audience snapshot
50% male · 50% female
Core age group25-34
Sebastián has a follower count of 48,912, placing him in the micro influencer category. His audience skews evenly male and primarily falls within the 25-34 age range, with Costa Rica being the top geographic location.
Collaboration pricing
Price tierPremium
Get the AI fair-price estimate → free trialWhich brands fit Sebastián Castro?
Brands in the running, fitness, and nutrition sectors would align well with Sebastián's expertise and audience interests. His authentic and educational approach makes him a suitable partner for brands looking to promote products related to endurance training and healthy living.
Frequently asked questions
How many Instagram followers does @sebas_castro_ have?
As of July 2026, @sebas_castro_ has 48,912 followers (49K) on Instagram, follows 2,468 accounts, and has published 1,112 posts. Zaver refreshes these numbers on a rolling basis.
How do I contact @sebas_castro_?
Verified contact details for @sebas_castro_ — including business email where available — are held in Zaver, alongside contacts for 77M+ other Instagram creators. Zaver users can unlock them instantly and reach out with AI-personalized outreach. Unlock @sebas_castro_'s contact info — free trial →
How much does @sebas_castro_ charge for a sponsored post?
@sebas_castro_ sits in the premium price tier on Zaver, based on follower scale, engagement and niche. Zaver's AI pricing model also produces a fair per-post price range with justification, so brands can negotiate from data instead of guessing. Get the AI fair-price estimate →
What is @sebas_castro_'s net worth?
@sebas_castro_'s net worth isn't publicly verified, and Zaver doesn't estimate personal wealth. What can be assessed is sponsored-post earning potential: with 49K followers and a premium price tier in running, brand collaborations are a meaningful income stream — Zaver's AI pricing model estimates what each placement is worth. See the earning-potential estimate →
Does @sebas_castro_ have fake followers?
Zaver's AI authenticity check scores @sebas_castro_ 96/100, based on 20+ signals including engagement quality, follower growth patterns and signs of purchased followers. That indicates a predominantly genuine audience. Run the full authenticity check →
Who follows @sebas_castro_?
@sebas_castro_'s 49K followers skew 50% male / 50% female, core age group 25-34. Full audience breakdowns — age bands, gender split and country-level distribution — are part of @sebas_castro_'s report on Zaver.
Which influencers are similar to @sebas_castro_?
Zaver lists comparable running creators in the "Influencers like @sebas_castro_" section on this page, matched by niche, audience size and engagement. Zaver users can also search all 4,639 vetted running creators with plain-English queries.
What is the follower count?
Sebastián has 48,912 followers.
What is the engagement rate?
The engagement rate data is not available.
What is the collaboration pricing?
Sebastián is in the premium price tier for collaborations.
What is the content niche?
His primary niche is running, with secondary niches in fitness and nutrition.
