Worked example
What $100 buys a tool directory
Link data is cheap per call, so the real question is how many calls a directory makes. Here is one invented month, line by line.
SEO Tools AI research team ·
The directory below, ToolShelf, is invented. Its numbers are made up to show the arithmetic of credits. Replace them with your own listing count.
ToolShelf, one month
| Job | Calls | Credits each | Credits | Cost |
|---|---|---|---|---|
| Score all 5,000 listings with bulk_dr | 3 | 1 | 3 | $0.0003 |
| Referring domains for the top 500 listings | 1 | 2 | 2 | $0.0002 |
| Anchors for 40 featured listings, one call each | 40 | 2 | 80 | $0.008 |
| Rival overlap for 12 new tools with intersect | 12 | 2 | 24 | $0.0024 |
| Month total | 109 | $0.0109 |
Read the total twice
About a cent. That is the whole month.
The $100 free credit is 1,000,000 credits, and this month used 109 of them. Even if ToolShelf checked every listing's anchors, two credits per call times 5,000 listings is 10,000 credits, or $1.
That is why the backlink checker tool free question is slightly the wrong one for a directory. Free web forms are fine for one lookup, and in bulk the paid per-call price is so low that engineer time costs more than data.
What we would do
With $100, with $1,000, with nothing
The spending order is almost always the same, and none of it needs a subscription.
- With nothing: use the free actions and a monthly manual pass for under 50 tools.
- With the free $100: automate the whole listing column and keep two years of credit in reserve.
- With $1,000 to spend: put the money into editorial work. Better reviews move readers more than a fifth decimal place of link data.
Where the money really goes
Data is the smallest line of a directory's budget. Hosting, review time, screenshots and outreach to vendors all cost more.
Be careful with one trap: listing economics often reward whoever pays for placement, and a link score can then be used to launder that placement as merit. Keep paid slots visibly labelled, and sort the organic list by a metric you can explain.
Mind the quality bar. Google's helpful content guidance, folded into core ranking with the March 2024 core update, favours pages that show first-hand expertise. A directory that only repeats a number adds little. Add your own testing notes beside it.
A failure is not a disaster. If a call fails with HTTP 402, the credit is gone. Top up with USDT (TRC-20) from the account page, and the sync recipe in sheet and n8n sync shows how to stop cleanly.
A second hypothetical: ten times the size
Now imagine a larger invented site, ToolAtlas, with 50,000 listings. Scoring all of them takes 25 bulk_dr calls, which is 25 credits or $0.0025.
Adding referring domains for every listing at 2 credits and 1,000 rows per call needs 50 calls, so 100 credits, or one cent. Add anchors and top pages and you reach about 300 credits.
Under a dime a month. The work that grows is on your side: storage, page templates and checking that scores still match the right domains. Plan for the listing fields before the calls.
Money questions
Is the $100 credit really free?
Yes. Signing in with a Google account adds $100 of credit, which is 1,000,000 credits, and no card is asked for. When it runs out, calls return HTTP 402 until you top up with USDT.
Does a bigger response cost more?
No. Each call is billed once whatever the number of rows, up to 1,000 rows per call. Deep pagination is capped at 50,000 rows. That is why asking for the full page of rows is almost always the cheaper choice.