# API Polling vs Webhook Call Budget Calculator

> Source: https://netray.co/tools/api-polling-vs-webhook-api-call-budget-calculator
> Publisher: Netray (netray.co), AI and integration engineering for ERP and manufacturing systems.
> Section: Free Tools

## Short answer

Quantifies how many API calls a polling loop burns versus event delivery, and the latency you trade for it.

## Category

developer

## Audience

- Integration developer
- ERP admin
- Solution architect

## Tool

**Kind:** calculator

**Inputs:**

#### Polling interval

**Key:** interval

**Type:** slider

**Default:** 5

**Min:** 1

**Max:** 60

**Step:** 1

**Unit:** minutes

#### API calls per poll

**Key:** pages

**Type:** number

**Default:** 1

**Min:** 1

**Step:** 1

**Unit:** calls

**Help:** Calls needed to read changes since last poll.

#### Real changes per day

**Key:** events

**Type:** number

**Default:** 400

**Min:** 0

**Step:** 25

**Unit:** events

#### Daily API call quota

**Key:** quota

**Type:** number

**Default:** 50000

**Min:** 1

**Step:** 5000

**Unit:** calls per day

#### Polling hours per day

**Key:** hours

**Type:** number

**Default:** 24

**Min:** 1

**Max:** 24

**Step:** 1

**Unit:** hours

#### Detail fetch calls per event (webhook)

**Key:** fetch

**Type:** number

**Default:** 1

**Min:** 0

**Step:** 1

**Unit:** calls

**Help:** Many webhooks send only an ID and require a follow-up read.

**Outputs:**

#### Polls per day

**Key:** polls

**Expr:** hours * 60 / interval

**Format:** integer

#### Polling API calls per day

**Key:** poll_calls

**Expr:** polls * pages

**Format:** integer

**Primary:** true

#### Webhook approach API calls per day

**Key:** hook_calls

**Expr:** events * fetch

**Format:** integer

**Primary:** true

#### Polls that find nothing (approx.)

**Key:** empty

**Expr:** max(0, 100 - events / max(polls, 1) * 100)

**Format:** percent

**Description:** Assumes changes spread evenly; bursts reduce it.

#### Quota used by polling

**Key:** quota_poll

**Expr:** poll_calls / quota * 100

**Format:** percent

#### Average delay with polling

**Key:** delay

**Expr:** interval / 2

**Format:** minutes

**Chart:**

#### Polling calls per day by interval

**Type:** line

**X:** interval

**From:** 1

**To:** 60

**Steps:** 30

**Series:**

- poll_calls
- hook_calls

**Disclaimer:** Webhook delivery is typically near real time but needs a public or relayed endpoint, signature checks and retry handling that polling does not.

## Content

**Intro:** Polling is simple but spends calls on checks that find nothing. Webhooks spend calls only when something changes, but need an endpoint and failure handling. This calculator puts numbers on the trade-off.

**Sections:**

#### How to use it

**Body:** Enter your polling interval, how many API calls each poll needs, and how many real changes happen per day. Add your daily quota and, for the webhook route, how many follow-up reads each event triggers. The calculator shows polls per day, total calls for both approaches, the share of polls that find nothing and how much of your quota polling consumes. Slide the interval to see the tension between freshness and cost; the chart plots both approaches across one to sixty minutes.

#### Formulas

**Body:** Polls per day equal polling hours times 60 divided by the interval. Polling calls are polls times calls per poll. Webhook calls are events times detail fetches per event. The empty poll share is one minus events divided by polls, floored at zero, which assumes an even spread. Average delay for polling is half the interval, because a change lands on average halfway between polls.

**Bullets:**

- Short intervals multiply cost with little added value.
- Webhooks need idempotent receivers and replay.
- Hybrid works: webhooks plus a slow reconciliation poll.

#### Choosing in practice

**Body:** If the ERP exposes reliable events, use them and add an occasional reconciliation poll to catch missed deliveries. If it does not, poll with a modified-since filter and the longest interval the business tolerates. Many on-prem ERPs lack outbound webhooks, in which case a database trigger, change table or message queue may be the practical event source. Keep polling read-only and avoid peak transaction hours.

**Cta:** Netray builds ERP integrations that use events where the system supports them and careful polling where it does not. We can review your options.

**Faq:**

#### When is polling the better choice?

**Answer:** When the source has no webhooks, when events are rare but reliability matters, or when you need a simple setup behind a firewall with no inbound endpoint. A modest interval with a modified-since filter is often enough.

#### Do webhooks guarantee delivery?

**Answer:** No. Senders retry for a limited window, and events can be dropped or arrive out of order. Pair webhooks with idempotent handling and a periodic reconciliation poll to catch gaps.

#### What interval should I use?

**Answer:** Start from the business tolerance for delay. If a five minute lag is fine, polling every five or ten minutes is reasonable. Anything shorter than the tolerance mainly burns quota.

#### Does this matter for AI agents?

**Answer:** Yes. Agents answering questions can read live on demand, so they rarely need polling. Background sync that keeps an index or cache fresh is where polling and webhooks compete.

## Search terms

polling vs webhook, api polling interval calculator, webhook vs polling api quota, erp change detection polling cost, poll interval api calls per day, event driven vs polling erp integration

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