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Two protocols

Every Syntalic endpoint accepts two payment protocols. The server auto-detects which you’re using from request headers — there is no separate URL or routing config.

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Pricing tiers

All prices are denominated in USD and settled in USDC (x402) or Tempo’s stablecoin equivalent (MPP).

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Discovery

Endpoints are self-describing. Calling any URL without a payment returns:
Agents that speak either protocol can resolve this metadata, sign payment, and retry — fully unattended. The Syntalic server is also indexed on x402scan, so x402-aware agents can find it via discovery alone.

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Client options

You don’t have to write your own x402 client. Three pre-built paths:
  • Syntalic MCP — our own MCP server. Leanest path for Claude/Cursor users; no third-party dependency.
  • AgentCash — universal x402 wallet + CLI for many paid APIs. Best if you already use it elsewhere.
  • Direct HTTP — official @x402/fetch wrapper for full control over signing.

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Which protocol should I use?

  • Your agent has a Solana or EVM wallet: use x402. Settlement is on-chain in USDC, ~1–2 second confirmation.
  • You don’t want to manage signing keys or wallets: use MPP/Tempo. Tempo holds the balance and handles auth.