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SALT19 Commerce Decision Engine
x402
SALT19 Commerce Decision Engine is a paid API for AI agents from api.salt19.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).
Evaluates a payment request against a spending policy and returns a GO/NO-GO decision with a selected payment offer for x402-style micropayments
Price / call$0.01
Success—
StatusUnknown
How this service works
SALT19 is an independent applied AI systems lab behind EvoMind governed cognition, the MCP-native Agent Utility Grid, the ARCS research community, AeroClear UAS flight intelligence, and practical software for real-world work.
Output
A JSON object containing a 'decision' field ('GO' or 'NO-GO'), a 'selected_offer' with the chosen payment amount, scheme, and network, plus cryptographic hashes for the offer, policy, request, and a preflight root for auditability. Also includes a 'policy_valid' boolean indicating whether the submitted policy was well-formed.
Example use cases
Agent fleet daily spend enforcement
“I have an agent that autonomously calls paid APIs throughout the day. Before each payment, check whether the requested charge fits within my policy: max $0.50 per transaction, $5.00 per day, only USDC on Base, and only from pre-approved payees. Return GO or NO-GO so the agent knows whether to proceed.”
Blocked payee guardrail for autonomous agent
“My agent is about to pay a new API provider I've never used before. Run a preflight commerce decision — my policy blocks any payee not on my approved list and caps single payments at $0.10 USDC on eip155:8453. Let me know if this offer passes or fails before any funds move.”
Multi-network payment offer selection
“I've received an x402 payment_required response with multiple offer options across different networks. Use my policy — allowed networks are Base and Polygon, max amount 50000 atomic units, allowed asset USDC — to pick the best valid offer and confirm it's a GO.”
Technical details
Endpoint
POSThttps://api.salt19.com/v1/commerce-decisionWhen to prefer
Choose this endpoint when an AI agent needs to enforce a governed spending policy before executing an x402 micropayment — especially when you need cryptographic proof (hashes) of the decision for audit trails, when blocking/allowlisting payees is critical, or when operating in a multi-network environment and need deterministic offer selection. Prefer this over manual policy checks when the agent operates autonomously at high frequency and needs a fast, structured GO/NO-GO signal.
Side effects
- Invalid or malformed policy object — returns policy_valid: false
- payment_required object missing required fields (x402Version, accepts) — validation error
- Requested resource string exceeds 2048 characters — schema rejection
- spend_24h_atomic or max_amount_atomic not a valid numeric string — pattern mismatch
- No accepted offer matches policy constraints — decision returns NO-GO
- max_timeout_seconds outside 1–3600 range — schema rejection
- Payment provider unreachable or offer list empty — no selectable offer
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| policy | object | |
| request | object | |
| payment_required | object |
Output
Schema · Response
{
"type": "json",
"example": {
"decision": "GO",
"offer_hash": "...",
"policy_hash": "...",
"policy_valid": true,
"request_hash": "...",
"preflight_root": "...",
"selected_offer": {
"amount": "20000",
"scheme": "exact",
"network": "eip155:8453"
}
}
}Tags
x402
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