The archive · AI & Models · Product decision · 2021–2025
Lastro bets AI on WhatsApp fixes Brazil's real estate; R$85M Series A led by Prosus
Brazilian proptech's Lais agent runs inside real-estate agencies' WhatsApp: R$85M Series A led by Prosus, 1,000+ agencies, 2M+ buyers served.
Lastro
What the business is
Lastro is a Brazilian AI proptech whose agent Lais works inside real-estate agencies' WhatsApp to answer buyers and tenants 24/7, suggest properties, issue boletos and register maintenance requests.
Starting capital：R$85M (~US$16M) Series A (September 2025) led by Prosus Ventures, with FJ Labs, Endeavor Scale-Up, Canary, QED and 1Sharpe
How it started
Founded in 2021, Lastro bet that Brazilian real estate was 'enormous and full of simple, repetitive, time-consuming tasks' — exactly the work AI handles — and built an autonomous platform integrated with WhatsApp.
What happened
Lais launched in early 2024 and reached more than 1,000 agencies and 2M+ people searching for property; AWS selected Lastro as one of ten Brazilian startups in its global generative-AI accelerator in 2024.
How it ended up
In September 2025 Lastro raised the R$85M Series A led by Prosus (investor in iFood and OLX), bringing total funding to about US$20M, to scale Lais and consolidate itself among Brazil's leading AI startups.
Background
Lastro is a Brazilian AI proptech founded in 2021. Its bet: real estate in Brazil is 'enormous and full of simple, repetitive, slow tasks' — the kind of work AI does best — so an agent that runs first contact and operations can transform the industry without replacing agencies.
Its product Lais lives inside real-estate agencies' WhatsApp: it answers buyers and tenants 24/7, suggests properties, issues boletos, registers maintenance requests and turns interactions into market-intelligence dashboards. Lastro says average response time dropped from six hours to about 15 seconds and visit conversion rose up to 60%.
Lais launched in early 2024 and reached more than 1,000 agencies and 2M+ Brazilians searching for property. In 2024 AWS picked Lastro among ten Brazilian startups in its global generative-AI accelerator.
In September 2025 Lastro closed an R$85M Series A led by Prosus Ventures — the investor behind iFood and OLX — with FJ Labs, Endeavor Scale-Up, Canary, QED and 1Sharpe, bringing total funding to roughly US$20M to scale Lais across Brazil.
What has to be true
- Real estate is one of the last industries with unstructured data and multi-party coordination, so Lastro targeted a sector where AI had little competition.
- Working inside WhatsApp removed adoption friction for agencies and buyers alike, making the agent a tool rather than a replacement.
- Concrete operating metrics — 15-second response time, up to 60% conversion lift — gave investors and customers a measurable proof point.
- Prosus brought the playbook and capital of scaling iFood and OLX in Brazil, which fit Lastro's ambition to be a leading national AI company.
What can be applied
Automate the repetitive layer, not the human: Lastro handled first contact and paperwork inside the channel brokers already use, so the metric story was easy to buy.
Aftermath
As of September 2025 Lastro had raised R$85M (~US$16M) in a Prosus-led Series A, roughly US$20M total, and was scaling Lais across more than 1,000 Brazilian real-estate agencies. The company planned to expand Lais' capabilities and integrations to consolidate its position among Brazil's leading AI startups; no valuation or revenue figures were disclosed in the verified sources.
Sources
- Lastro capta R$ 85 milhões em série A
- Lastro levanta Série A de R$ 85 milhões para acelerar o futuro do mercado imobiliário com a IA da Lais
- Lastro raises BRL 85 million Series A round led by Prosus Ventures
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