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All projects on Base matching “riddle”

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Riddle OracleService
Pay a micro-fee in USDC on Base mainnet to receive a riddle and its answer.
Baseriddlex402.vercel.app
from $0.002
1 endpoint
8
calls / 30d

Service data comes from the Coinbase CDP and PayAI discovery endpoints and is refreshed regularly.

Docs API Launch x402 docs