Data anchoring and timestamping · Comparison
KAS Anchor API vs Truestamp
2 products compared side by side: what you pay for with each one first, then the five access facts, entry prices, recorded plan limits and the bottom line of each review. The evidence note under the table says how each product was checked.
Side by side
| Metric | KAS Anchor API | Truestamp |
|---|---|---|
| What you're paying for | Saves engineering timeAnchor private-chain block hashes or other data to the Kaia public chain through a managed API, without running a Kaia node. | Saves engineering timeProofs that verify offline with an open-source CLI, committed to two public chains, and free for 50 items a month. |
| Overall score | 1.5 | 3.5Best |
| Free option | –Not measured | Free plan |
| Card to start | –Not measured | No card needed |
| Getting access | Sales call required | Self-serve |
| Starter priceCheapest paid plan | –Not measured | $0 |
| Pricing model | Custom quote | Tiered |
| Pricing page | Prices hidden | Prices hidden |
| What it anchors to | Kaia mainnet (one transaction per payload) | Stellar and Bitcoin (epoch roots of its own ledger) |
| Billing unit | Pay as you go by anchoring cycle and usage, by contact | Items a month per plan; paid tiers not on sale |
| Free option | Not stated for the Anchor API | 50 items a month, 90-day retention |
| Reference scenario (100,000 hashes/mo) | Priced by sales | No plan on sale |
| Proof you keep | Transaction hash per payload | Self-contained proof bundle (JSON or binary) |
| Verify without the vendor | Not described | Open-source CLI, offline |
| Only the hash leaves your systems | Yes, you choose the payload | Yes; content can also be redacted |
| Qualified timestamps (eIDAS) | No | No (terms say not qualified) |
| SOC 2 / ISO 27001 | Not stated | Not stated |
| API and webhooks | REST API and caver SDK extensions; no webhooks | REST, GraphQL, CLI, MCP; webhooks on paid tiers |
| SSO | Not listed | Not listed |
| Bottom line | From its public pages, the KAS Anchor API is a managed route to anchor payloads on Kaia, now run by AhnLab Blockchain Company. Price, proofs and verification guidance are not on the pages. | From its public pages, Truestamp has the strongest proof portability here: two chains, self-contained bundles and an open-source offline verifier. Only the free plan can be used today. |
Evidence: KAS Anchor API: facts checked 2026-10-15 from its public sign-up and pricing pages, no completed hands-on run; Truestamp: facts checked 2026-10-15 from its public sign-up and pricing pages, no completed hands-on run. Prices in USD as listed, excluding tax. "–" means not recorded.
Entry price
Baseline: each product's cheapest paid plan, per month. Included usage differs, so read the line under each price.
- KAS Anchor APIKAS API Starter$300/moGeneral KAS API plan: 100,000 requests a day
- Ticket-based support
- Overuse billed at the plan rate per request × 120%
- TruestampStarterComing soon750 items a month; not on sale yet
- 5 teams, 5 members per team
- 5 webhook endpoints
- Unlimited retention
- Email support
Prices as listed on each pricing page, in USD per month, excluding tax. Observed: KAS Anchor API 2026-10-15, Truestamp 2026-10-15.
Which one fits
- If you need to start today without a sales call
- TruestampSelf-serve sign-up, no card needed; the only one here you can use right after signing up.
- If you want to try it without entering a card
- TruestampFree plan, no card needed; scored 3.5/10.
- Lowest starter price
- KAS Anchor API$300/mo. Truestamp lists no comparable paid price.
- Highest overall score
- Truestamp3.5/10 (Fair). The review shows the score breakdown and the run behind it.
Picked by fixed rules from the table above, not by hand. How we score
Full reviews
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