Mediumby Questflow AI

Questflow

First public multi-chain x402 facilitator. Part of a broader AI agent orchestration ecosystem with 50+ agent integrations. Over 48.25K+ transactions processed. Widest multi-chain EVM support with 6+ chains including Optimism, Arbitrum, and Mantle.

Last researched: 2026-03-30

Supported Chains

BaseOptimismArbitrumPolygonXLayerMantle

Pricing

Base

0% fee on Base chain. API key required.

Free

Other Chains

Fee on other chains not publicly disclosed

Variable

SDKs & Libraries

JavaScript / TypeScript

x402-express

Python

x402-python (pip)

Setup Steps

1
Request an API key from Questflow
2
Install x402-express or x402-python SDK
3
Configure the facilitator URL (https://facilitator.questflow.ai)
4
Add the Authorization header with your API key
5
Select your preferred chain and start processing payments

Use Cases

•Multi-chain EVM agent payment orchestration
•AI agent workflow automation with payments
•50+ agent ecosystem integrations
•L2-native micropayments (Optimism, Arbitrum, Mantle)

Pros & Cons

Pros

+Widest multi-chain EVM support (6+ chains)
+0% fee on Base chain
+50+ agent integrations in ecosystem
+Strong partnership network

Cons

-Requires API key (not permissionless)
-Fee structure on non-Base chains unclear
-Not permissionless
-Closed-source facilitator

Links

Website→Facilitator→Blog→GitHub→