How much does Spies cost in AoE3?

75 coin (AoE3: Definitive Edition 100.19.18309).

Technology

Spies

Spies (tech ID SpiesNative) is a technology in AoE3: Definitive Edition 100.19.18309 costing 75 coin at the Town Center.

Quick answers (2)

How much does Spies cost in AoE3?: 75 coin (AoE3: Definitive Edition 100.19.18309).
What is the tech ID of Spies?: SpiesNative.

You can see everything your enemies can see! Total Cost: 75 gold per enemy unit.

No effect with a readable number; see the game's description above.

1 further effect (interface, visuals or AI) not listed.

Source: techtreey.xml and the Home City files, AoE3: DE 100.19.18309 (build 25040513).