Can Wavesteam build an API resale or aggregation portal?
Yes—but only when the upstream provider explicitly permits resale, agency, or aggregation; the underlying API business is lawful; usage and invoices reconcile; and keys and data can be controlled. Buying an ordinary account and reselling its calls, sharing unauthorized keys, or depending on hidden interfaces is not a viable project. The portal page is simple; the product is the rights chain, gateway, metering, billing, failure isolation, and ongoing operation.
First define “relay.” Commercializing the client's own API, acting as an authorized channel, routing among approved suppliers, and providing an internal enterprise gateway have different rights and duties. Messaging, payment, identity, mapping, financial data, and generative AI may add sector entry, real-name, content, and data requirements. Assess each API by business, data, users, and charging model rather than relying on one generic registration checklist.
| Model | Upstream relationship | Customer value | Decision |
|---|---|---|---|
| Client-owned API | Client lawfully controls interface and data | Developer access, plans, service levels, support | Rights are clear; validate demand |
| Authorized agency or resale | Contract permits resale, branding, and price rules | Local settlement, support, unified docs | Build after territory, customer, and termination checks |
| Multi-supplier routing | Every supplier authorizes use and functions are substitutable | Common contract, failover, cost optimization | Prove semantic equivalence and dependency risk |
| Internal API portal | Existing authority within one organization | Catalogue, access, quotas, and audit | Prefer a mature gateway and developer portal |
| Unauthorized redistribution | End-user account, shared key, or hidden interface | Cheap relay | Do not implement |
When decomposing features, data, and acceptance scenarios, also compare Can Wavesteam start with product design and business discovery when requirements are unclear?; the linked guidance adds context that should be considered in the same decision.
Prove the economics and responsibility of each successful call
The unit model includes upstream success and failure charging, retries, currency and tax, payment fees, refunds, free allowance, support, and fraud. Prepaid balances need rules for paid and promotional funds, freezing, expiry, reversal, and refund; postpaid accounts need limits, terms, and collection. A gateway request ID links the customer call, every upstream attempt, result, billable unit, and price version. Logs should support dispute without retaining unnecessary sensitive content.
An upstream HTTP 200 is not always billable success. Suppliers charge by request, token, image, duration, or completed result, and an upstream task may execute after the local timeout. The customer contract defines platform success, disputes, credits, and maximum liability. Reconcile actual supplier invoices and test margin under peak, failure, currency, and promotion scenarios—not only list-price subtraction.
The gateway is a control plane, not a proxy
Issue a separate application and secret to each customer. Display secrets once and support rotation and revocation. Bind applications to interfaces, quota, environment, and any permitted origin. Authentication does not replace object- and function-level authorization: one customer must never read another's use or bill. Limit rate, concurrency, payload, response, and spend by customer, API, and supplier; pause abnormal growth before it consumes the upstream balance.
Use short timeouts, bounded retries, circuit breaking, and degradation. Never blindly retry a non-idempotent operation. Before failover, prove request meaning, data handling, and output quality are compatible. The OWASP API Security Project covers authorization, authentication, resource consumption, sensitive flows, inventory, and unsafe consumption of third-party APIs—all directly relevant here.
A usable developer product adds a machine-readable OpenAPI contract, sandbox, examples, error codes, version policy, status page, invoice detail, and support. Protect online consoles from SSRF with restricted test credentials and destinations. Price changes, balance credits, and log access require least privilege, confirmation, and durable audit.
Acceptance covers normal use, unauthorized objects, replay, bursts, insufficient balance, supplier timeout, duplicate callback, price changes across billing periods, and supplier outage. Reconcile metering against upstream invoices and observe success, P95 latency, error categories, customer spend limit, key-revocation time, and failover evidence. Availability claims must specify API, region, period, and exclusions.
Wavesteam begins by reviewing upstream authorization and sample contracts, then proves authentication, metering, invoice reconciliation, and suspension on a minimal path. If rights or economics fail, work stops. If they hold, mature gateways, identity, and payment services usually beat rebuilding infrastructure; customization focuses on supplier adapters, charging, and the developer experience. The Transparent Delivery Standard defines the associated scope and evidence principles.