Gasless-ready checkout
0.5%flat gateway fee
16 Proofsoperational explainers
No custodydirect multisig & vault routing
Testnetbefore mainnet review
Sponsor supported token checkout fees only where the token and route allow it.
Fee Delegation lets merchants configure sponsored-fee policies for supported permit-based token flows. Unsupported tokens fall back to normal wallet payment.
Fee Delegation is a policy and execution model for supported gasless token payments. It requires merchant policy activation, a compatible deployed router, relayer configuration, and a token that supports permit-style approvals.
01
Merchant enables fee delegation policy and limits.
02
Checkout detects whether the selected token supports the required approval flow.
03
Supported payments use the gasless route and relayer policy.
04
Unsupported tokens use the normal wallet transaction path.
Who pays gas?
Sponsored gas is paid by the configured relayer or policy wallet. If the token is not supported, the payer uses the standard wallet gas flow.
Operational limit
Fee Delegation is not universal gasless crypto. It only applies to supported token, route, contract, and policy combinations.
FAQ
What problem does this XPayr flow solve?
Fee Delegation is a policy and execution model for supported gasless token payments. It requires merchant policy activation, a compatible deployed router, relayer configuration, and a token that supports permit-style approvals.
Who pays gas or network fees?
Sponsored gas is paid by the configured relayer or policy wallet. If the token is not supported, the payer uses the standard wallet gas flow.
What should merchants not assume?
Fee Delegation is not universal gasless crypto. It only applies to supported token, route, contract, and policy combinations.
Verifiable Open-Source & AI Protocol Registry
Publicly auditable SDKs, cryptographic evidence envelopes, and MCP registries.
Official 21-Tool MCP Server
Registered as io.github.xpayrcom/xpayr-mcp-server on the Official Anthropic MCP Registry and published as @xpayr/mcp-server on NPM and ghcr.io/xpayrcom/xpayr-mcp-server:latest.
Merkle Payment Evidence & ES256 Tokens
Verify on-chain settlement envelopes with @xpayr/payment-evidence and offline-verifiable ES256 wallet licenses with @xpayr/extension-kit.
30 Open-Source Repositories & RFC 9116
Inspect all 20 REST API v1 schemas interactively at api-docs.xpayr.com, review our 30 repositories at github.com/xpayrcom, and check /.well-known/security.txt & /.well-known/jwks.json.
Need to prove the flow before production?
Use testnet checkout, API docs, webhook guides, and operational explainers before asking for mainnet activation.