APISphere — APIs for AI Agents

Pay-per-call APIs for AI agents. No signup required. Pay with USDC on Base via the x402 protocol.

API Products

• POST http://localhost:3000/api/v1/crypto-price — $0.001 USDC/call
• POST http://localhost:3000/api/v1/geocode — $0.001 USDC/call

Discovery

• llms.txt — machine-readable API listing
• openapi.json — OpenAPI 3.0 spec
• agents.json — agent card

Quick start

curl -X POST http://localhost:3000/api/v1/crypto-price \
  -H "Content-Type: application/json" \
  -H "X-Payment: <x402-payment-payload>" \
  -d '{"symbols": ["btc", "eth"]}'