ERC-8409: Signed Service Payment Quotes

Дата публикации: 03-09-2026 12:47:24

This proposal defines an EIP-712 format for service providers to sign EVM payment quotes for a specific request.
The goal is to keep the provider’s quoted terms separate from the payer’s authorization and the settlement mechanism itself.
A quote commits to the issuer, an optional payer, the settlement chain, asset, recipient, amount, request, quote ID, and validity window.
The format is transport-independent. HTTP, x402, MCP, A2A, and other protocols can define their own request schemes and transport bindings while using the same signed quote structure.
I’d especially appreciate feedback on:
whether this is the right standardization boundary compared with protocol-specific signed offers;
how request schemes should be extended and shared between implementations;
EOA and ERC-1271 verification semantics;
settlement, expiry, and replay behavior.
Links
PR: https://github.com/ethereum/ERCs/pull/1990
Specification: https://github.com/SergeevDmitry/ERCs/blob/erc-signed-service-payment-quotes/ERCS/erc-8409.md
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