feat(docs): nethermind fpc docs (backport to v4-next)#22532
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critesjosh merged 1 commit intobackport-to-v4-next-stagingfrom Apr 14, 2026
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feat(docs): nethermind fpc docs (backport to v4-next)#22532critesjosh merged 1 commit intobackport-to-v4-next-stagingfrom
critesjosh merged 1 commit intobackport-to-v4-next-stagingfrom
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## Summary - Adds documentation for third-party Fee Payment Contracts (FPCs) on testnet and mainnet, using Nethermind's Private Multi Asset FPC as a reference integration example - Adds a new "How FPCs work" explainer section covering the quote → authwit → setup → app-phase flow, key integration properties (authwit scope, gas estimation, quote expiry), and the cold-start variant - Adds a deprecation notice for the built-in `PrivateFeePaymentMethod` / `PublicFeePaymentMethod` SDK classes (do not work on mainnet alpha) - Updates existing FPC documentation to clarify that FPCs hold their own Fee Juice balance and can accept other tokens, rather than requiring L1 bridging - Renames "Sponsored Fee Payment Contracts" to "Sponsored FPC" and scopes it to devnet/local only - Updates the participant-facing fees page to distinguish Sponsored FPC from third-party FPCs ## Files changed - `docs-developers/docs/aztec-js/how_to_pay_fees.md` — third-party FPC section, Nethermind example, deprecation notice, table reformatting - `docs-developers/docs/foundational-topics/fees.md` — new "How FPCs work" section, teardown clarification, link fix - `docs-developers/docs/aztec-js/how_to_create_account.md` — updated link text and anchor to match renamed heading - `docs-participate/basics/fees.md` — rewritten fee-paying contracts section ## Test plan - [ ] `yarn start` — verify dev server starts and all four changed pages render correctly - [ ] Confirm internal links (`#sponsored-fpc-devnet-and-local-only`, `#third-party-fpcs-on-testnet-and-mainnet`, `#how-fpcs-work`) resolve - [ ] Verify `#include_code` snippets still render in the how-to-pay-fees and how-to-create-account pages - [ ] `yarn spellcheck` passes - [ ] Review Nethermind FPC external links resolve (GitHub repo, SDK README, protocol spec) Co-authored-by: Esau <esau@aztec-labs.com> Co-authored-by: critesjosh <jc@joshcrites.com> Co-authored-by: josh crites <critesjosh@gmail.com>
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Summary
Backport of #22496 to v4-next.
Cherry-pick applied cleanly — no conflicts.
Original PR
Adds documentation for third-party Fee Payment Contracts (FPCs) on testnet and mainnet, using Nethermind's Private Multi Asset FPC as a reference integration example.
ClaudeBox log: https://claudebox.work/s/b06a98c8d4c9aeda?run=1