Paso de la Amada was occupied from roughly 1800 to 1000 BC during the Early Formative era, likely by the Mokaya, a pre-Olmec people who inhabited the fertile Soconusco region along the Gulf of Tehuantepec. The site sits in farmland between the modern town of Buenos Aires and the settlement of El Picudo. Jorge Fausto Ceja Tenorio discovered it in 1974 and began excavations. Later, archaeologists John E. Clark and Michael Blake turned their attention to the mounds, recognizing that their layered construction might reveal how Mesoamerican societies first developed social hierarchies. What they found at Paso de la Amada was the architectural record of a community transforming itself from a village of equals into a society with leaders.

In 1995, archaeologists uncovered the ruins of a ballcourt structure dated to 1400 BC, making it the oldest known example in Mesoamerica. The court measures approximately 80 meters long and 8 meters wide, situated between two parallel mounds with benches 2.5 meters deep and 30 centimeters tall running along their length. What made the discovery especially revealing was the court's location: rather than occupying a public ceremonial precinct, it was associated with high-status residences. The ballgame, which later cultures would invest with profound religious and political meaning, began here as something more intimate. It was a sport for the privileged, played where the powerful lived. Archaeologists have described Paso de la Amada as providing 'the best evidence' for Olmec contacts in the Soconusco region.

The largest structure at the site, Mound 6, reads like a time-lapse of political evolution. Six distinct building phases were stacked on top of one another, each telling a different story about who held power and how publicly they displayed it. The first structure was a large building at ground level, probably a communal meeting house where village men gathered. As the centuries passed, each successive rebuilding made the platform taller and the structure on top smaller. By the time structure two was built, the project required an estimated twenty people working for twenty-five days, a significant collective labor investment. But the building that all that labor supported was smaller than its predecessors, accommodating fewer people. The platform grew while the inner circle shrank. Someone was giving orders, and the architecture recorded that shift from community consensus to concentrated authority.

According to archaeologist Richard Diehl, Olmec merchants appeared in the Paso de la Amada area and their visits gradually reshaped the local social hierarchy in what Diehl described as the 'Olmec-ization' of the region. The influence was not just cultural but structural: Olmec contact accelerated the rise of nearby Canton Corralito as a regional center, eventually eclipsing Paso de la Amada itself. Excavations at the neighboring site of San Carlos helped explain many of Paso de la Amada's findings, suggesting a close relationship between the two communities. The site captures a specific and fleeting moment in Mesoamerican history: the transition from independent, pre-Olmec coastal societies to a world increasingly organized by the cultural gravity of Mesoamerica's first great civilization.