A valid credential can establish who is making a request without establishing what the next operation costs. Conflating those questions creates avoidable surprises in agent workflows.
Quick answer: Review authentication, product access, billing policy and available allowance separately. Identify the operation's billable unit and treatment of failures or retries before execution. If the cost is unresolved, stop the dependent action and obtain the missing plan information rather than assuming the connection made it free.
Ask the commercial questions explicitly
For an illustrative extraction API, a connected account may still require a product subscription, a remaining allowance or an available wallet balance.
| Question | Why it is separate |
|---|---|
| Who is calling? | Authentication identifies the account |
| May this account use the product? | Product access can depend on a plan |
| What event is charged? | Billing needs a defined unit |
| What remains available? | Usage state changes over time |
| What happens after failure? | Retry and charge rules vary |
These are review dimensions, not a universal statement about every marketplace's implementation.
Do not infer policy from a plan label
“Free,” “trial” or “pay as you go” is not a complete contract. Read the current selected product's scope, limits and transition behavior.
An agent should preserve the plan information supporting a spending decision. A successful test call does not establish that the next larger request has the same cost.
Explain the decision before commitment
Where human approval is needed, present the product, operation, data and expected cost basis together. An unexplained “continue?” prompt asks the user to approve an unknown transaction.
If pricing cannot be determined, make that gap visible. Do not turn uncertainty into an invented zero.
I'm Shashank Agarwal, creator of API.market and founder and CEO of Noveum AI. API.market's MCP page explicitly distinguishes OAuth connection from subscriptions and usage charges.
See the pricing-page review and quota, rate and concurrency guide for the next checks. The example above is illustrative.
Follow my work on LinkedIn. Drafted with AI assistance.
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