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RelayShield SIM Swap Detection
x402
RelayShield SIM Swap Detection is a paid API for AI agents from api.relayshield.net, paid per call via x402, $0.25/call, status unknown (last checked 2026-10-29).
Checks whether a given phone number has had a SIM swap performed recently, returning carrier and swap timestamp details
Price / call$0.25
Success—
StatusUnknown
How this service works
Identity security, threat monitoring and intelligence for the agentic AI era. TAP verifier for agentic commerce, MCP Proxy Firewall for AI agents, and threat intelligence APIs backed by 725K indicators across 129 monitored marketplaces.
Output
Returns a JSON object with ok:true and a data object containing the phone number, current carrier name, a boolean indicating whether a swap occurred, the timestamp when the check was performed, and if swapped, the timestamp of the swap event.
Example use cases
Pre-authentication SIM fraud check
“Before sending the SMS verification code to +14155551234, check if that number has been SIM swapped in the last 24 hours — if it has, block the login attempt.”
Financial transaction safety gate
“We're about to wire $5,000 to an account tied to +12125550987 — can you run a SIM swap check on that number first to make sure it hasn't been recently ported or hijacked?”
Account takeover investigation
“A customer is reporting suspicious activity on their account linked to +14085559876 — can you check whether their phone number experienced a SIM swap recently and tell me the carrier and when it happened?”
Technical details
Endpoint
POSThttps://api.relayshield.net/v1/payg/sim-swap?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to detect SIM swap fraud as part of an authentication or fraud-prevention pipeline, especially before sending OTP codes or approving high-value transactions. Prefer this over generic phone validation APIs when you specifically need SIM swap history and carrier attribution, not just number formatting or reachability checks.
Side effects
- Phone number not found or unsupported carrier returns error or null swap data
- Invalid phone number format causes a 400-level error
- Carrier data unavailable or rate-limited results in incomplete response
- Network timeout or upstream carrier API failure returns non-ok response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| phone | string | Phone number in E.164 format |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"data": {
"phone": "+14155551234",
"carrier": "T-Mobile",
"swapped": true,
"checked_at": "2026-05-19T10:00:00+00:00",
"swap_timestamp": "2026-05-18T14:23:00Z"
}
}
}Tags
x402
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