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SALT19 Commerce Verify
x402
SALT19 Commerce Verify is a paid API for AI agents from api.salt19.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).
Validates x402 payment-bound commerce transactions by checking policy compliance, payment payload integrity, and delivery binding for agent-initiated purchases.
Price / call$0.02
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
Returns a verdict string (e.g. VERIFIED_LOCAL_EVIDENCE), a commerce_root identifier, a boolean payment_binding_valid flag, a delivery_bound boolean, a settlement_evidence_authority label (e.g. CALLER_PROVIDED), and a limitations array explaining any caveats such as on-chain verification not being performed.
Example use cases
Agent purchase policy enforcement
“I'm running an autonomous agent that just received an x402 payment for a data fetch. Before it delivers anything, verify the payment payload against my policy: only USDC on Base is allowed, max per transaction is 1000000 atomic, daily cap is 5000000 atomic, payee must be 0xDEAD...BEEF, and the resource is https://api.example.com/data. Tell me if the payment binding is valid.”
Spend limit compliance audit
“My agent just tried to make a payment and I want to make sure it didn't exceed the 24-hour spend cap of 10000000 atomic units. Check the attached payment_required and payment_payload objects and tell me if the transaction is policy-compliant and properly bound to the requested resource.”
Delivery-gating before releasing content
“Before I release the premium report to the buyer, verify that their x402 payment is properly bound to this resource URL and that the settlement evidence matches — my expected SHA256 hash is a3f1...cd92 and required fields are 'amount' and 'payee'. Return the verdict so I know it's safe to deliver.”
Technical details
Endpoint
POSThttps://api.salt19.com/v1/commerce-verifyWhen to prefer
Choose this endpoint when an AI agent needs to gate delivery of a resource or service on x402 payment validity — especially when enforcing spending policies (payee allowlists, per-transaction caps, daily limits, network restrictions) before releasing content. It is purpose-built for the SALT19 Agent Utility Grid's MCP-native x402 payment flow and returns structured verdicts that agents can act on programmatically. Prefer it over generic payment webhooks when you need policy-aware, delivery-bound verification with structured limitation disclosures.
Side effects
- Missing required 'resource' field in request object returns validation error
- payment_required object missing x402Version or accepts fields causes schema rejection
- policy constraints violated (e.g. payee not in allowed_payees) returns non-verified verdict
- expected_sha256 mismatch causes delivery binding failure
- Malformed atomic unit strings (non-numeric) fail pattern validation
- max_timeout_seconds outside 1-3600 range rejected at schema level
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| policy | object | |
| request | object | |
| delivery | — | |
| settlement | object | |
| payment_payload | object | |
| payment_required | object | |
| expected_delivery | object | |
| target_salt19_operation_id | string |
Output
Schema · Response
{
"type": "json",
"example": {
"verdict": "VERIFIED_LOCAL_EVIDENCE",
"limitations": [
"Caller-provided settlement evidence is structurally checked but not independently queried on-chain."
],
"commerce_root": "...",
"delivery_bound": true,
"payment_binding_valid": true,
"settlement_evidence_authority": "CALLER_PROVIDED"
}
}Tags
x402
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