x402 vs Sardine
x402 vs Sardine, compared side by side on 14 data points: what each one does, how big it is, what it has raised, the tech running each site, and what users report. We score both out of 100 on traction, team and visibility: x402 is on 10/100 and Sardine on 71/100.
Where each one leads
x402
- agent readiness: 52/100 against 44/100
- domain rating: 80/100 against 68/100
Sardine
- our overall score: 71/100 against 10/100
At a glance
| Measure | x402 | Sardine |
|---|---|---|
| What it is | An open-source, web-native payment protocol enabling autonomous AI agents to transact over HTTP. | AI-powered risk platform for fraud prevention, compliance, and credit underwriting. |
| Category | Fintech, Blockchain, AI, Payments | Fintech, Payments, Fraud Detection, Compliance |
| Sells toBusiness model | B2B | B2B |
| Offering | Platform | Platform |
| Founded | 2025 | 2020 |
| Headquarters | San Francisco, United States | San Francisco, United States |
| Status | Active | Active |
Size, funding and growth
| Measure | x402 | Sardine |
|---|---|---|
| Employees | Not published | 331 |
| Total funding | Not published | $25.0M |
| Latest round | Not published | Series C Extension |
| Valuation | Not published | $660M |
| LinkedIn followers | Not published | 53,578 |
StartupHub scores
Our own 0-100 ratings. They measure company strength and site quality, not which product suits you.
| Measure | x402 | Sardine |
|---|---|---|
| StartupHub scoreOur 0-100 rating | 10/100 | 71/100 |
| Team | 30/100 | Not published |
| Search visibility | 8/100 | Not published |
| Agent readinessHow well an AI agent can read and act on the site | D (52/100) | D (44/100) |
| Domain ratingLink authority, 0-100 | 80/100 | 68/100 |
Technology
Detected on each public site, so it reflects the marketing stack as well as the product.
| Measure | x402 | Sardine |
|---|---|---|
| Hosting | Not detected | Vercel |
| CDN | Cloudflare | Vercel |
| CMS | WordPress | Not detected |
| Frameworks | Jquery, Tailwind CSS | Next.js, Tailwind CSS |
| Analytics | Google Tag Manager | Google Tag Manager |
| Agentic commerceMachine-readable checkout or agent payment rails | X402 | Not detected |
| Open source | Yes | No |
x402 vs Sardine: common questions
Which is better, x402 or Sardine?
On our 0-100 score Sardine rates higher (71/100 against 10/100). The score weights traction, team, visibility and profile completeness, so it reflects company strength rather than which product suits you. We compare the two on 14 data points above: read the rows that match what you are buying for.
How do x402 and Sardine compare on the numbers?
x402 leads on agent readiness (52/100 against 44/100), domain rating (80/100 against 68/100). Sardine leads on our overall score (71/100 against 10/100).
Read the full x402 review and pricing or the Sardine review and pricing. You can also browse other x402 alternatives we track.