16 pay-per-call AI services — DeepSeek V4 Pro (1M context) · x402 USDC · MCP
curl https://agent-api-ai.duckdns.org/api/validate-json -H "Content-Type: application/json" -d '{"data":"{\"name\":\"test\"}"}'
No payment → 402 with PAYMENT-REQUIRED header. MCP: /mcp/sse
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