Signa — The global trademark API for developers and AI agents.
Signa: the global trademark API, built for developers and AI agents. Search, screen and monitor trademarks across the world’s registers, including USPTO, EUIPO, WIPO and UKIPO, through an API, SDK, MCP server or web app. Free to start, no card required.
Signa: the numbers
| Entry price | Free to start · Starter $99/mo billed yearly |
|---|---|
| Free tier | Free $0/mo · 10,000 credits on signup, 1,000 credits a month, up to 100 searches · no card required |
| Trademark records | 40M+ records |
| Coverage | USPTO, EUIPO, WIPO, UKIPO and more — one API |
| Best for | Developers & IP teams |
| Mix score | 8.0 |
Prices and limits were checked against Signa’s own pages on 8 November 2026 and can change; signa.so is always the final word.
What Signa does
Signa: the global trademark API, built for developers and AI agents. Search, screen and monitor trademarks across the world’s registers, including USPTO, EUIPO, WIPO and UKIPO, through an API, SDK, MCP server or web app. Free to start, no card required.
Search uses exact, fuzzy and phonetic matching, so near-misses and sound-alikes surface too. Screening flags potential conflicts before you commit to a name, and monitoring watches new filings and alerts you on similar marks.
It is a clean REST API with webhooks, so it fits into a build pipeline or an agent workflow. Screening and listing checks are in BETA, available through design-partner access — expect a waitlist rather than instant access for those two features.
Signa pricing
| Plan | Price | Credits / month | Searches | Extra credits |
|---|---|---|---|---|
| Free | $0/mo | 10,000 on signup, then 1,000 a month | Up to 100 | — |
| Starter | $99/mo billed yearly | 20,000 a month | Up to 2,000 | $10 per 1,000 extra credits |
| Growth | Price not shown on signa.so/pricing | Production use | — | — |
The Free tier needs no card. Starter is billed yearly at $99 a month. A Growth tier exists for production use — its price is not shown on signa.so/pricing, so check the pricing page for the latest.
The verdict
A solid specialist B2B API for trademark data at scale.
The free tier is genuinely usable for evaluation — 10,000 credits on signup and 1,000 a month, no card required. The catch is that screening and monitoring are in beta, so expect a waitlist for those two. And it is not for casual users who just want to check one name — a free web search does that. Mix score 8.0 — a solid specialist API for developers and IP teams who need trademark data at scale.
Signa questions
Is there a free tier?
Yes. The Free tier is $0 a month — 10,000 credits on signup and 1,000 credits a month, up to 100 searches, and no card is required.
Which trademark registers does Signa cover?
USPTO, EUIPO, WIPO, UKIPO and more, through one API — over 40 million records.
How much is the Starter plan?
$99 a month billed yearly — 20,000 credits a month, up to 2,000 searches, and $10 per 1,000 extra credits.
Are screening and monitoring available now?
Screening and listing checks are in BETA, available through design-partner access — expect a waitlist.
How this listing got here
Disclosure: Signa was submitted to AiTopMix by its maker, Håkon. The maker approved this listing with a replacement summary. AiTopMix checked the facts against Signa’s own pages on 8 November 2026; signa.so is always the final word.
Directory facts as listed on AiTopMix, checked 8 November 2026; signa.so is always the final word.