Payments overview

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.

Protocol	Network	Best for	Setup time
x402	USDC on Solana or Base	Agents with a wallet	~5 min
MPP/Tempo	Tempo hosted micropayments	Agents that can’t sign on-chain transactions	~2 min

Pricing tiers

Persona	Price per query	Endpoint count
Shopper	$0.01	4
Marketing	$0.01	8
Analyst	$0.02	7
Taxonomy	$0.01	3
Social	$0.03	7
Scout	$0.05	2

All prices are denominated in USD and settled in USDC (x402) or Tempo’s stablecoin equivalent (MPP). Social and Scout are scoped to a browse category root (grocery-gourmet-food, beauty-personal-care). They do not take a subcategory filter.

Discovery

Endpoints are self-describing. Calling any URL without a payment returns:

HTTP/1.1 402 Payment Required
Content-Type: application/json

{
  "x-payment-info": {
    "price": "0.01",
    "currency": "USD",
    "x402": {
      "recipient": "...",
      "chain": "solana",
      "asset": "USDC"
    },
    "mpp": {
      "recipient": "...",
      "network": "tempo"
    }
  }
}

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.

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.

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.

Get Started

Integrate

Payments

Reference

Payments overview

Two protocols

Pricing tiers

Discovery

Client options

Which protocol should I use?

​Two protocols

​Pricing tiers

​Discovery

​Client options

​Which protocol should I use?

Two protocols

Pricing tiers

Discovery

Client options

Which protocol should I use?