Hardby xEcho AI
xEcho
Distinguished by unique on-chain settlement callbacks enabling post-payment programmability. Pioneered the 'Pay to X' concept including pay-to-earn and outcome-based payments. Built-in KYT/OFAC compliance screening for regulated use cases.
Last researched: 2026-03-30
Supported Chains
Base
Pricing
Free
Free0% fee on Base
SDKs & Libraries
JavaScript / TypeScript
Standard x402 middleware compatibleSetup Steps
- 1Configure standard x402 middleware with xEcho facilitator URL
- 2Set up settlement callback endpoint for post-payment logic
- 3Configure KYT/OFAC compliance parameters if needed
- 4Implement Pay-to-X logic for outcome-based payments
- 5Test on Base with USDC
Use Cases
- •Programmable post-payment settlement callbacks
- •Outcome-based and pay-to-earn payment models
- •KYT/OFAC-compliant agent payments
- •On-chain settlement verification with custom logic
Pros & Cons
Pros
- +Unique settlement callbacks for post-payment programmability
- +Innovative Pay-to-X concept (pay-to-earn, outcome-based)
- +KYT/OFAC compliance screening built-in
- +0% fee on Base
Cons
- -Very limited public documentation
- -Base chain only
- -No public GitHub repository
- -No dedicated SDK (relies on standard x402 middleware)