Third-Party Integrations

Gravv delivers banking, payout, card, compliance, and custody capabilities through regulated partner institutions and licensed providers. Provider credentials are held exclusively in GCP Secret Manager; provider calls are signed where required (HMAC schemes per provider); and provider webhooks are ingested through dedicated authenticated endpoints at the API gateway.

Crypto Custody & Blockchain

Provider	Used by	Role
Dfns	Web3	MPC wallet custody across eight networks, transaction signing (user-action signing with ECDSA P-256), gas fee sponsorship.
Circle	Web3, Payees, Transfer, Onramp	USDC infrastructure: wire accounts, payouts, cross-currency exchange, recipient addresses, onramp completion.
Rhino.fi / AllBridge	Web3	Cross-chain bridging.
OpenTrade	Web3	Savings / yield product.
Quidax	Integrations, FX	Crypto sub-accounts, payment addresses, withdrawals, deposits.
Noah	Integrations, Internal Accounts	Fiat↔crypto conversion sessions, pay-in sessions, onboarding.

Banking & Virtual Accounts

Provider	Used by	Role
Bridge	Internal Accounts, Payees, Transfer	USD/EUR virtual accounts, external accounts, ACH/SEPA rails.
HiFi	Internal Accounts, Payees, Transfer, Integrations	KYC lifecycle, virtual accounts, offramp transfers, SWIFT.
Erebor	Payees, Transfer	USD banking, master deposit account.
Sokin	Payees, Transfer, Integrations	Business onboarding, FX, international transfers, beneficiary management.
Duplo	Transfer, Integrations, Internal Accounts	NGN dedicated virtual accounts, bank transfers, settlements (HMAC-SHA512 signed).
Anchor	Transfer, Payees routing	NGN virtual accounts and transfers.
Austin Capital, Yolat, Lead Bank	Internal Accounts, Onramp, Integrations	Account provisioning, wallet payouts, virtual accounts.
Virtual IBAN provider	Transfer	EUR virtual IBAN issuance.

Cross-Border Payouts & Local Rails

Provider	Used by	Role
Thunes	Transfer, Payees	Cross-border payouts (HMAC-signed requests, secret webhook path).
Yellow Card	Transfer, Payees, Onramp, Integrations	African rails: payouts, collections, settlements, rates (HMAC-signed).
Dlocal	Transfer, Payees, Integrations	African / LatAm payouts, account verification (HMAC-signed).
Fincra	Transfer, Payees, Integrations	NGN conversions, account verification, transfers.
Balad, Attijariwafa, I&M Bank, NMBZ	Transfer, Payees, FX	Regional bank rails (Middle East / North & East / Southern Africa).
Flocash, Passpoint, Beam	Integrations	Mobile-money and bank transfers, RTP transfers, payment accounts.
MoneyGram	API gateway	Account validation, transfer execution, and status (dedicated partner API surface).

Cards

Provider	Used by	Role
Coinflow	Onramp, Integrations	Card charging, tokenization (card-on-file), payment links, 3-D Secure.
Rain	Web3, Risk	Card issuing; card asset withdrawal; KYC share tokens.

Compliance & Identity

Provider	Used by	Role
Sumsub	Risk	KYC / KYB verification, document collection, liveness, review webhooks, applicant share tokens (signed requests).
Stytch	Identity, Web apps	Passwordless authentication (magic links) for dashboard and admin.

FX Liquidity

Provider	Used by	Role
Standard Bank, ABSA, NMBZ	FX (via banking-integrations)	Institutional FX rates and trade execution.
Quidax	FX	Crypto-adjacent rate sourcing.

Operational Tooling

Provider	Used by	Role
Slack	API gateway, Transfer, Payees, Onramp	Operational alerting: payout escalations, manual-processing queues, low-balance warnings, gateway alert middleware.

Webhook Ingestion

The API gateway exposes dedicated live and sandbox webhook endpoints for: Bridge, Thunes, Sumsub, Balad, Dlocal, Yellow Card, Fincra, Austin Capital, Attijariwafa, Coinflow, Flocash, Rain, Circle, Sokin, HiFi, Duplo, Yolat, Dfns, Quidax, Erebor, and onboarding events. Ingested events are published to Kafka (webhooks.inbound.events) and consumed by the responsible services (Transfer, Web3, Risk, Identity, Internal Accounts).