Free
Workflows using this tag
Avalara Onboard an Exempt Customer · Avalara
Avalara Adjust a Committed Transaction · Avalara
Avalara Estimate Rate Then Quote · Avalara
Avalara Create Company With Nexus · Avalara
Avalara Quick Tax Quote · Avalara
Avalara Initialize Company With Defaults · Avalara
Avalara Refund a Transaction · Avalara
Avalara Void and Recreate a Transaction · Avalara
Business capabilities this tag reaches
Tax Management 1
Providers using this tag (86)
Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.
Strong 4 Solid coverage with minor gaps
Developing 13 Usable, with meaningful gaps to close
Thin 18 Limited public surface area
Emerging 32 Early or largely undocumented
ISS Location API (Open Notify)US Grow ZonesCheckMyVINDoxy.meLRCMuxV2JSON (SkyV2X)AppScreenshotsdocs-md-comCat Facts APIPeppyrusCorporate Bullshit Generator APIAZAV-DokuAppBoardRick and Morty APItrakis-ioApplyKoalaOpen Trivia DBFree Barcode Generator OnlineNoozra8BGMX (mail)AimusicgenCountries GraphQL APIAssetizesubdomain-appapp-kit-devPixabayBase of AGIguruwalk-comArabicKeyboard.aiAISO ToolsAcutis Go
Minimal 4 Almost no public developer surface
APIs with this tag (23)
Ranked by the provider's API Evangelist rating — the Kin Score is scored per provider, not per API, so every API of a provider shares its band. How the rating works →
Exemplar 3 Complete, well-documented, and agent-ready
Strong 2 Solid coverage with minor gaps
Developing 3 Usable, with meaningful gaps to close
Thin 8 Limited public surface area
Elevation APIProvides worldwide elevation data via a simple GET endpoint. Free tier allows limited requests per IP; paid...astro-agent-dev Free APIThe free API from astro-agent-dev — 3 operation(s) for free.101soundboards TTS APIFree Text‑to‑Speech API providing up to ~60 phrases per hour, with bearer token authentication. See the doc...Assay Systems Free APIThe Free API from Assay Systems — 2 operation(s) for free.DefiLlama Public APIFree, no-auth REST API exposing 31+ endpoints for protocol TVL, chain TVL, coin prices, stablecoin metrics,...Frankfurter APIFree and open-source API for current and historical forex rates.Solscan Public APIFree, lower-rate-limit public API exposing basic account, transaction, and token endpoints used by the Sols...Anansi Data Free APIThe Free API from Anansi Data — 4 operation(s) for free.
Emerging 1 Early or largely undocumented
Unrated 6 Not yet scored
AI was here Free APIThe Free API from AI was here — 1 operation(s) for free.BuiltWith Free APIThe Free API from BuiltWith — 1 operation(s) for free.CatchDoms Expired Domains API Free APIThe Free API from CatchDoms Expired Domains API — 1 operation(s) for free.Clearbit Autocomplete APIFree, unauthenticated company autocomplete: returns candidate companies (name, domain, logo) for a name fra...Clearbit Logo API (retired)RETIRED 2025-12-08. The free Logo API returned a company logo image for a domain with no authentication. An...Codag Free APIThe Free API from Codag — 1 operation(s) for free.
Companies reaching this through an API (19)
These companies publish an API, specification or operation carrying “Free” but do not classify their business under it. Listed unranked and kept out of the count above, because one tagged operation is not a statement about what a company does.
AI was here
Anansi Data
ashareapi-com
Assay Systems
astro-agent-dev
Atomadic Tech
Avalara
BuiltWith
CatchDoms Expired Domains API
Clearbit (HubSpot Breeze Intelligence)
Codag
Council of AI
DeBounce
DefiLlama
factline-dev
Forex
IBANforge
loopholetape-com
Solscan
Score breakdown
Frequency
48.9
log-scaled weighted occurrences
Breadth
0.4
spread across providers
Quality lift
71.8
mean composite of providers using it
Cohesion
5.2
strength of nearest seed neighbor
Related tags
No Auth 5 co-occurrences
Tools 7 co-occurrences
Community 6 co-occurrences
A2A Verified 5 co-occurrences
Discovery 5 co-occurrences
Finance 9 co-occurrences
A2A 5 co-occurrences
Open Source 10 co-occurrences
Where this tag comes from
Provider tag86
Api tag23
Openapi tag12
Openapi op tag71
Cohort brief
Auto-generatedThe 50 providers in the APIs.io catalog tagged Free, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.
Providers
50
of 67 in the catalog
Mean Kin Score
even vs catalog
Mean Agent Readiness
19.4
+6.6 vs catalog 12.8
Spread
–
median · σ
How the 50 split by band
Exemplar 0Strong 3Developing 7Thin 17Emerging 20Minimal 3
Facet averages, against the whole catalog
| Facet | This cohort | Catalog | Difference | Scored |
|---|---|---|---|---|
| Contract Quality | 29 | 17.7 | +11.3 | 50 |
| Access Clarity | 32.1 | 26.5 | +5.6 | 50 |
| Contract Governance | 12.3 | 7 | +5.3 | 50 |
| Discoverability | 62.2 | 58 | +4.2 | 50 |
| Operational Transparency | 15.8 | 13.2 | +2.6 | 50 |
| Developer Ergonomics | 23.4 | 23.8 | -0.4 | 50 |
A facet is averaged over the members that carry it, not over the whole cohort — the “Scored” column is that count. Averaging an absent facet as zero would score our own coverage gaps as the providers’ posture.
What this cohort publishes
| Artifact | This cohort | Catalog | Difference |
|---|---|---|---|
| MCP server (any) | 34% | 15% | +19 |
| MCP server (first-party) | 36% | 13% | +23 |
| Agent Skills | 0% | 0% | 0 |
| OAuth scopes | 20% | 12% | +8 |
| Security | 100% | 98% | +2 |
| Arazzo workflows | 0% | 2% | -2 |
| Governance rules | 60% | 18% | +42 |
mcp_pct counts any mcp/ artifact including ones API Evangelist derived from the provider OpenAPI; mcp_first_party_pct counts only servers the provider publishes. Prefer the latter.
Top by Kin Score
Top by Agent Readiness
- 1 Zeffy {"score" => 52.6, "band" => "agent-ready"}
- 2 Alpha Vantage {"score" => 51.4, "band" => "agent-ready"}
- 3 Tally {"score" => 49.4, "band" => "agent-ready"}
- 4 lotsofsounds-com {"score" => 48.9, "band" => "agent-ready"}
- 5 scripthaul-com {"score" => 45.5, "band" => "agent-ready"}
- 6 aplusz-app {"score" => 44.4, "band" => "agent-native"}
- 7 42min {"score" => 43.3, "band" => "agent-ready"}
- 8 animalchecklist-com {"score" => 41.5, "band" => "agent-ready"}
- 9 Cat Facts API {"score" => 39.2, "band" => "agent-ready"}
- 10 Sunrise Sunset {"score" => 38.9, "band" => "agent-ready"}
All 67 members of this roster resolve to a provider in the
catalog; 50 carry a score (75%).
The figures above describe the scored members only.
Coverage caveat. 36 of 50 scored members had under half their catalog-attributable points satisfied at all (catalog_earned / catalog_max < 0.5). They are INCLUDED in the mean above. A large share here means the cohort mean is partly a measurement of how far our enrichment reached, not only of how these providers publish.Generated from the catalog build of 2 November 2026, across 37080 providers, using the same computation served by the APIs.io cohort API. Briefs are published for rosters of 5 or more scored providers; below that a distribution is not meaningful.
Coverage caveat. 36 of 50 scored members had under half their catalog-attributable points satisfied at all (catalog_earned / catalog_max < 0.5). They are INCLUDED in the mean above. A large share here means the cohort mean is partly a measurement of how far our enrichment reached, not only of how these providers publish.Generated from the catalog build of 2 November 2026, across 37080 providers, using the same computation served by the APIs.io cohort API. Briefs are published for rosters of 5 or more scored providers; below that a distribution is not meaningful.
Work with this as data
Every tag here is available over the APIs.io API and to AI agents over MCP.