# Services from api.21.cash on Zero

> api.21.cash serves 2 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero.

Canonical page: https://www.zero.xyz/host/api.21.cash
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/api.21.cash/health.json

## Services

- [21.cash Payment Link – 100000 USDC Units](https://www.zero.xyz/c/api-21-cash-0415e849/llms.txt): $0.1/call via x402. Creates or triggers a 21.cash payment link requiring an exact payment of 100000 USDC v2 units (~$0.10) to address 0x8c913b70Db8FAcDAdc37BC2530559DBE879b95b5 on Base (eip155:8453) with a 300-second timeout.
- [21.cash Payment Link Fetch](https://www.zero.xyz/c/api-21-cash-50b762a0/llms.txt): $0.01/call via x402. Fetches a 21.cash payment link requiring an exact 10000-unit USDC (v2) payment on Base (eip155:8453) to a specific address with a 300-second timeout.

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

- [Zero catalog index](https://www.zero.xyz/llms.txt)