---
title: "Skyfire vs Stytch IsAgent | Agent Ready Crawlers"
description: "Skyfire vs Stytch IsAgent: rubric grades side by side, the sourced difference and verdicts for platform engineers, security engineers and publisher ops."
canonical: https://agentreadycrawlers.com/compare/skyfire-vs-stytch-isagent
site: "Agent Ready Crawlers"
last_updated: 2026-11-04
section: "Comparisons"
---

# Skyfire vs Stytch IsAgent | Agent Ready Crawlers

> Skyfire vs Stytch IsAgent: rubric grades side by side, the sourced difference and verdicts for platform engineers, security engineers and publisher ops.

Source: https://agentreadycrawlers.com/compare/skyfire-vs-stytch-isagent
Site: Agent Ready Crawlers
Last reviewed: 2026-11-04

Head-to-head

# Skyfire vs Stytch IsAgent

In short

Skyfire issues signed KYA and pay tokens that sellers verify against its JWKS; Stytch IsAgent is a front-end flag that Stytch says must not be used as a security control. On verifies agents the rubric grades Skyfire yes and Stytch IsAgent partial, and on per-purpose policy the rubric grades Skyfire not its job and Stytch IsAgent not published.

## The sourced difference

Skyfire issues signed KYA and pay tokens that sellers verify against its JWKS; Stytch IsAgent is a front-end flag that Stytch says must not be used as a security control. [Source](https://changelog.stytch.com/announcements/ann_iPdXgiqlNrBk0), read 2026-11-04.

## Side by side

| Question | Skyfire | Stytch IsAgent |
| --- | --- | --- |
| Tells a verified agent from a spoof | Yes; KYA JWTs that sites verify via Skyfire's JWKS; not a bot manager itself | Partial; Web Bot Auth signatures plus heuristic detection (user agent, TLS fingerprint, network traits) |
| Per-purpose policy (train, search, answer, act) | Not its job; sellers decide access from token claims such as agent and principal identity | Not published; per-purpose policy (checked 2026-11-04) |
| Charging for access | Yes; pay and kya-pay tokens charged by sellers, settled between Skyfire wallets | Not published; support (checked 2026-11-04) |
| Lets signed commerce agents through | Yes; KYAPay carries identity plus payment intent; card payment flow documented | Not published; Visa TAP or Mastercard Agent Pay support (checked 2026-11-04) |
| Cost | not published (checked 2026-11-04) | published: IsAgent free to 10,000 calls/month; fingerprints USD 0.005 each beyond 10,000 |
| Reporting | Not published; on pages read (checked 2026-11-04) | Partial; client hint with agent flag and identity, meant for analytics |
| Where it runs | either: sellers verify tokens in their backend, in a Cloudflare Worker, or through partner bot managers (F5, Akamai, Fastly) | app: client-side SDK calling Stytch's API, plus backend Lookup API for fingerprinting |
| Points, rank | 6 of 10, rank 6 (tied) | 2 of 10, rank 14 |
| Price read 2026-11-04 | no public fee schedule found on homepage or docs index (checked 2026-11-04) | IsAgent free up to 10,000 calls/month (contact Stytch above that); Device Fingerprinting USD 0.005 per fingerprint beyond 10,000 included; free tier 10,000 MAUs and AI agents. |

## Verdicts by reader

Platform engineer

IsAgent is a client hint for analytics and agent-friendly flows; Skyfire tokens are checked server side or in a Worker.

Security engineer

Only Skyfire gives you a verifiable credential; IsAgent can be altered in the browser, per Stytch.

Publisher operations

Skyfire carries payment intent; IsAgent carries none.

## What each does not do

### Skyfire

-   Does not detect or block unsigned bots; it only issues and settles tokens that sites or bot managers must check (docs).
-   KYA tokens alone cannot be charged; only pay and kya-pay tokens move money (introduction docs).
-   No published fee schedule (homepage and docs read 2026-11-04).

### Stytch IsAgent

-   IsAgent is not a security control; its client-side result can be tampered with (Stytch changelog, 2025-08-01).
-   Detection is heuristic and not 100% accurate (IsAgent FAQ).
-   No crawler monetization or per-purpose crawler policy (pages read 2026-11-04).

More: [alternatives to Skyfire](https://agentreadycrawlers.com/vendors/skyfire/alternatives/), [alternatives to Stytch IsAgent](https://agentreadycrawlers.com/vendors/stytch-isagent/alternatives/).

## Sources

-   [changelog.stytch.com: ann\_iPdXgiqlNrBk0](https://changelog.stytch.com/announcements/ann_iPdXgiqlNrBk0) read 2026-11-04
-   [skyfire.xyz: skyfire.xyz](https://skyfire.xyz/) read 2026-11-04
-   [stytch.com: pricing](https://stytch.com/pricing) read 2026-11-04
-   [docs.skyfire.xyz: verify and extract data from tokens.md](https://docs.skyfire.xyz/docs/verify-and-extract-data-from-tokens.md) read 2026-11-04
-   [changelog.stytch.com: ann\_uSpDBNlbdXL8X](https://changelog.stytch.com/announcements/ann_uSpDBNlbdXL8X) read 2026-11-04
-   [isagent-web.vercel.app: faq](https://isagent-web.vercel.app/faq) read 2026-11-04
-   [docs.skyfire.xyz: payments settlement.md](https://docs.skyfire.xyz/docs/payments-settlement.md) read 2026-11-04
-   [kyapay.org: kyapay.org](https://kyapay.org/) read 2026-11-04

Last reviewed 2026-11-04