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API Documentation | Chain — Stablecoin Infrastructure

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HomepageHomePaymentsGlobal stablecoin payments, payouts, and fiat conversion infrastructure.CardsOff-ramp stablecoins to fiat on supported debit cards globally.DocsAPIs, SDKs, and integration guides.Get startedAuthentication and quick start guide.AboutContactLaunch AppHomepageHomePaymentsGlobal stablecoin payments, payouts, and fiat conversion.OPEN PAGECardsOff-ramp stablecoins to fiat on supported debit cards.OPEN PAGEDocumentationAPIs, SDKs, and integration guides.AuthenticationPaymentsCardsWalletsWebhooksAPI ReferenceSDKsChangelogStatusOnyxAboutContactLaunch AppIntroductionAuthenticationPaymentsCard PayoutsWalletsLedgerWebhooksSDKsErrorsDashboardGitHubAPI StatusChangelogPaymentsFund accounts and send payouts globally with fiat-to-stablecoin conversion.POST /v1/fundingPOST /v1/payoutsPOST /v1/payeesCardsIssue and manage virtual and physical debit cards powered by stablecoin balances.GET /v1/cardsPOST /v1/cardsWalletsRegister and manage crypto wallets with compliance screening.GET /v1/walletsPOST /v1/walletsLedgerDouble-entry accounting ledger for tracking all financial movements.GET /v1/ledgerAuthenticationAPI keys, Bearer tokens, and rate limits.WebhooksReal-time event notifications with signature verification.SDKsOfficial client libraries for Node.js and Python.ErrorsComprehensive error codes and handling guide.HomepageHomeAboutCareersBlogContactSupportPaymentsCardsOnyxBanksPayment ProvidersReal World AssetsSecuritiesCryptoFinTechLending_PRIVACY_POLICY_TERMS

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