{"uid":"cap_zYtHzbW2ZFvxjkMx97bKH","slug":"relayshield-sim-swap-check-62704794","name":"RelayShield SIM Swap Check","description":"Check whether a phone number has had a SIM swap or carrier port in the last 24 hours via real-time carrier lookup. A recent swap is a strong signal of an active account-takeover attempt targeting SMS-based 2FA. Call before trusting an SMS OTP from this number.","url":"https://atq6wtkp6k.execute-api.us-east-1.amazonaws.com/prod/v1/payg/sim-swap","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"phone":{"type":"string","description":"Phone number in E.164 format"}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.25","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.25/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.25","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.25","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_VYVrTJwdGXpTtKXbhFT6G","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.25","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Checks whether a given phone number has recently had its SIM swapped, returning the carrier, swap status, and timestamp of the swap event.","exampleAgentPrompt":"Check if the phone number +14155551234 has had a SIM swap recently — I need to know the carrier and when the swap happened before I approve this login.","exampleUseCases":null,"resultDescription":"Returns a JSON object with the queried phone number, the current carrier (e.g. T-Mobile), a boolean indicating whether a SIM swap was detected, the timestamp when the check was performed, and the timestamp of the most recent SIM swap event if one occurred.","failureModes":["Phone number not found or not supported — returns error with no swap data","Invalid phone number format — returns validation error","Carrier data unavailable for the given number — partial response or error","Rate limit exceeded — HTTP 429 response","Insufficient USDC balance for x402 payment — payment failure before check executes"],"whenToPreferThis":"Use this endpoint when you need to detect SIM swap fraud before allowing sensitive actions like SMS-based 2FA logins, high-value financial transactions, or account recovery flows. Prefer this over generic identity checks when the specific risk vector is telecom-based SIM porting or swapping.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T00:34:16.565Z","isFirstParty":false}