The fastest, cheapest and most reliable agent tools this week.
Category: Knowledge & Research
Measured from real runs, updated every 5 minutes. Rankings use the rolling 30-day window your agent sees on every tool page. Nothing here is self-reported.
Some boards do not have enough measured runs in Knowledge & Research. Those show live tools ordered by price, verified first, and say so under the table. Run a tool and it starts counting.
Most reliable
live tools, verified first| # | Tool | Price | Health |
|---|---|---|---|
| 1 | A Search preprints arXiv/searchverified | $0.0020 per call | degraded · 8.0s |
| 2 | C Resolve DOI Crossref/doiverified | $0.0020 per call | degraded · 118ms |
| 3 | C Search papers Crossref/search-worksverified | $0.0020 per call | degraded · 163ms |
| 4 | FD Define word Free Dictionary/defineverified | $0.0020 per call | degraded · 19.8s |
| 5 | GB Search volumes Google Books/searchverified | $0.0020 per call | degraded · 142ms |
| 6 | NH Next public holidays Nager.Date Holidays/next-holidaysverified | $0.0020 per call | degraded · 158ms |
| 7 | NH Public holidays Nager.Date Holidays/public-holidaysverified | $0.0020 per call | degraded · 206ms |
| 8 | NO Astronomy picture of the day NASA Open APIs/apodverified | $0.0020 per call | degraded · 17.5s |
| 9 | NO Near-Earth objects NASA Open APIs/neo-feedverified | $0.0020 per call | degraded · 642ms |
| 10 | OL Lookup ISBN Open Library/isbnverified | $0.0020 per call | degraded · 1.1s |
Not enough tools have 5+ measured runs in Knowledge & Research. Showing live tools by price, verified first, until they do.
Fastest
live tools, verified first| # | Tool | Price | Health | Latency hint |
|---|---|---|---|---|
| 1 | A Search preprints arXiv/searchverified | $0.0020 per call | degraded · 8.0s | $0.0020 |
| 2 | C Resolve DOI Crossref/doiverified | $0.0020 per call | degraded · 118ms | $0.0020 |
| 3 | C Search papers Crossref/search-worksverified | $0.0020 per call | degraded · 163ms | $0.0020 |
| 4 | FD Define word Free Dictionary/defineverified | $0.0020 per call | degraded · 19.8s | $0.0020 |
| 5 | GB Search volumes Google Books/searchverified | $0.0020 per call | degraded · 142ms | $0.0020 |
| 6 | NH Next public holidays Nager.Date Holidays/next-holidaysverified | $0.0020 per call | degraded · 158ms | $0.0020 |
| 7 | NH Public holidays Nager.Date Holidays/public-holidaysverified | $0.0020 per call | degraded · 206ms | $0.0020 |
| 8 | NO Astronomy picture of the day NASA Open APIs/apodverified | $0.0020 per call | degraded · 17.5s | $0.0020 |
| 9 | NO Near-Earth objects NASA Open APIs/neo-feedverified | $0.0020 per call | degraded · 642ms | $0.0020 |
| 10 | OL Lookup ISBN Open Library/isbnverified | $0.0020 per call | degraded · 1.1s | $0.0020 |
Not enough tools have 5+ timed runs in Knowledge & Research. Showing live tools by catalog latency hint, verified first.
Cheapest
14 measured| # | Tool | Price | Health | Price |
|---|---|---|---|---|
| 1 | A Search preprints arXiv/searchverified | $0.0020 per call | degraded · 8.0s | $0.0020 |
| 2 | C Resolve DOI Crossref/doiverified | $0.0020 per call | degraded · 118ms | $0.0020 |
| 3 | C Search papers Crossref/search-worksverified | $0.0020 per call | degraded · 163ms | $0.0020 |
| 4 | FD Define word Free Dictionary/defineverified | $0.0020 per call | degraded · 19.8s | $0.0020 |
| 5 | GB Search volumes Google Books/searchverified | $0.0020 per call | degraded · 142ms | $0.0020 |
| 6 | NH Next public holidays Nager.Date Holidays/next-holidaysverified | $0.0020 per call | degraded · 158ms | $0.0020 |
| 7 | NH Public holidays Nager.Date Holidays/public-holidaysverified | $0.0020 per call | degraded · 206ms | $0.0020 |
| 8 | NO Astronomy picture of the day NASA Open APIs/apodverified | $0.0020 per call | degraded · 17.5s | $0.0020 |
| 9 | NO Near-Earth objects NASA Open APIs/neo-feedverified | $0.0020 per call | degraded · 642ms | $0.0020 |
| 10 | OL Lookup ISBN Open Library/isbnverified | $0.0020 per call | degraded · 1.1s | $0.0020 |
Lowest per-call or per-result price among live tools. Free keyless tools are listed separately on /tools.
Most used
14 measured| # | Tool | Price | Health | Runs |
|---|---|---|---|---|
| 1 | A Search preprints arXiv/searchverified | $0.0020 per call | degraded · 8.0s | 2 |
| 2 | C Resolve DOI Crossref/doiverified | $0.0020 per call | degraded · 118ms | 2 |
| 3 | C Search papers Crossref/search-worksverified | $0.0020 per call | degraded · 163ms | 2 |
| 4 | FD Define word Free Dictionary/defineverified | $0.0020 per call | degraded · 19.8s | 2 |
| 5 | NH Next public holidays Nager.Date Holidays/next-holidaysverified | $0.0020 per call | degraded · 158ms | 2 |
| 6 | NH Public holidays Nager.Date Holidays/public-holidaysverified | $0.0020 per call | degraded · 206ms | 2 |
| 7 | NO Astronomy picture of the day NASA Open APIs/apodverified | $0.0020 per call | degraded · 17.5s | 2 |
| 8 | NO Near-Earth objects NASA Open APIs/neo-feedverified | $0.0020 per call | degraded · 642ms | 2 |
| 9 | OL Lookup ISBN Open Library/isbnverified | $0.0020 per call | degraded · 1.1s | 2 |
| 10 | OL Search books Open Library/search-booksverified | $0.0020 per call | degraded · 857ms | 2 |
Runs recorded in the rolling window (up to 200 per tool).
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Updated 2026-09-02 15:52 UTC. Success rate counts 2xx responses only; upstream errors are never billed. Window: rolling 30 days, up to 200 most recent runs per tool.