Fidelity National Information Services (FIS) · Rate Limits
Fidelity National Information Rate Limits
FIS does not publish global per-second rate limits in the public Code Connect documentation. Each API and each customer environment has limits specific to the product (core banking, card processing, capital markets) and the contracted volume. Sandbox endpoints have lower throughput than production; production limits are governed by the customer's contract and underlying platform sizing.
4 Limits
Throttle: 429
Financial ServicesPaymentsBankingCapital MarketsWealth ManagementRisk and ComplianceRate Limiting
Limits
Sandbox APIs (Code Connect Developer Portal) developer-account
per-developer test ceiling; not publicly published
Suitable for prototyping only.
Production banking / payments APIs contract
sized to the customer's contracted transaction volume; not publicly published
Capital Markets / Wealth APIs contract
sized to firm volume and platform deployment; not publicly published
Real-time payments (FedNow / RTP via FIS) contract
governed by the underlying clearing rails and customer's certified throughput
Policies
OAuth 2.0 / mTLS
Authenticate with OAuth 2.0 and/or mutual TLS depending on API; rotate credentials before expiry.
Backoff on 429/503
Exponential backoff with jitter on transient errors; honor Retry-After when present.
Idempotency
Use idempotency keys on POST endpoints for payments and transfers to make retries safe.
Customer-environment sizing
Production limits are sized to the customer's underlying platform deployment; raise via FIS service request and capacity review.