toolgrep / AI agents & frameworks / Priors
Alternatives to Priors
Priors: Credit for AI agents. 8 products similar to Priors, compared on pricing, free tier, API, MCP server, SDK and open source. 7 of 8 have a free tier, 7 of 8 have an API, 7 of 8 offer an MCP server, 1 of 8 is open source.
- Central City
Every AI. One room.
- QVeris
Bring professional data to the AI you already use
- Agent Tollgate Engine
Pay-per-call market intelligence and fee-bearing swap routing for autonomous trading agents, paid in USDC per request via HTTP 402.
- CodeRifts
Contract-change authorization for AI agents: fail-closed authorization-execution gate with offline-verifiable receipts
- minia2a.uk
Marketplace of 1,600+ pay-per-call API services for AI agents, settled in USDC on Base via the x402 protocol.
- Userfront
The AI Portal for Professionals
- agentsvc.io
Pay-per-call API marketplace for AI agents with 127 services settled in USDC via x402
- X402 Git
Get paid by agents for your code
Side by side
| Product | Pricing | Free tier | API | MCP server | SDK | Open source |
|---|---|---|---|---|---|---|
| Priors | Usage-based | yes | yes | yes | yes | yes |
| Central City | Freemium | yes | yes | yes | yes | yes |
| QVeris | Usage-based | yes | yes | yes | yes | no |
| Agent Tollgate Engine | Usage-based | yes | yes | yes | — | — |
| CodeRifts | Freemium | yes | yes | yes | yes | — |
| minia2a.uk | Usage-based | yes | yes | yes | no | — |
| Userfront | Usage-based | no | no | no | no | no |
| agentsvc.io | Usage-based · from $0.002 per call | yes | yes | yes | no | — |
| X402 Git | Free | yes | yes | yes | — | — |
Facts come from each product's own website, or from its verified owner when they have edited the listing. Each product page shows when it was last verified and how it was extracted. Similarity comes from the products' descriptions.
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