YourAITools

Best Protocols & SDKs that accept crypto (2026)

The standards and SDKs behind agent payments. Start here if you're building a paid API or an agent that pays. 4 listings compared side by side.

#ToolProtocolNetworksTokensPrice / callVerified
1A2A x402 Extensionx402 over A2AEVM networksUSDCVaries, see provider2026-10-21
2Cloudflare Agents x402x402BaseUSDCVaries, see provider2026-10-21
3Vercel x402-mcpx402BaseUSDCVaries, see provider2026-10-21
4x402 (open standard)x402Base, Solana, other EVM networksUSDC, other EIP-3009 / SPL tokensVaries, see provider2026-10-21

How we order this list

Order: lowest listed starting price per call first, then A to Z. Listings without a published price come last. We don’t publish third-party usage statistics. The order is not a ranking of quality or an endorsement, and paid Featured or Sponsored placements never change the order. Prices and networks come from each provider’s own site or payment requirements, verified on the date shown on each tool page.

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