Bottom line for your use case:
① Turnkey — best raw signing infrastructure for a trading bot: 50–100 ms signing, the most granular policy engine (per-address, per-amount, per-function rules), delegated access for bots, passkeys for the PWA. Tradeoff: per-signature pricing ($0.10 → $0.05 on Pro) is the worst fit for high-frequency strategies until you negotiate enterprise rates (down to $0.0015/sig).
② Privy — best developer experience and fastest PWA onboarding (React SDK, whitelabel UI, passkeys, social login). Server wallets <200 ms, delegated actions let your bot sign while the user is offline. 50K free signatures/month is generous for a mid-frequency bot. Now owned by Stripe (vendor lock-in consideration).
③ Coinbase CDP Agentic Wallets — cheapest transparent pricing at volume: $0.005/operation, first 5,000/month free, open-source AgentKit purpose-built for AI agents. Limited to EVM + Solana.
Avoid for this use case: Fireblocks direct (six-figure entry, institutional), Dfns (bank-grade but heavy), Magic (auth-focused, you'd need separate vendors for automation).
| Platform | Fit score | Pricing | Signing latency | Key security | Bot / agent signing | Policy engine | PWA / passkeys | Chains | Audits / compliance |
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