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Apr 14, 2026
## 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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critesjosh
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Apr 14, 2026
## 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
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critesjosh
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Apr 22, 2026
Ports changes from #22496 (Nethermind FPC docs) and #22497 (private FPC guide) to the v4.2.0 developer versioned docs, plus related updates to source docs (docs-developers), transaction phases explanation, and runnable TypeScript examples. Files: - developer_versioned_docs/version-v4.2.0: how_to_pay_fees.md, how_to_use_private_fee_juice.md, foundational-topics/fees.md, foundational-topics/transactions.md - docs-developers: how_to_pay_fees.md, how_to_use_private_fee_juice.md, foundational-topics/fees.md, foundational-topics/transactions.md - examples/ts: aztecjs_advanced/index.ts, aztecjs_connection/index.ts
chrismarino
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May 5, 2026
…#22541) ## Summary - Ports changes from AztecProtocol#22496 (Nethermind FPC docs) and AztecProtocol#22497 (private FPC guide) to the `v4.2.0-aztecnr-rc.2` developer versioned docs - Updates `how_to_pay_fees.md` with new payment methods table, deprecation notice, third-party FPC section (Nethermind example), and private fee payment section - Updates `fees.md` (foundational topics) with expanded FPC payment methods description, new "How FPCs work" section, and teardown phase clarification - Updates `how_to_create_account.md` anchor links to match renamed heading - Adds new `how_to_use_private_fee_juice.md` guide (DeFi Wonderland's PrivateFPC) ## Test plan - [ ] `yarn start` in `docs/` — verify versioned pages render correctly - [ ] Confirm internal links resolve (anchors to `#sponsored-fpc-devnet-and-local-only`, `#third-party-fpcs-on-testnet-and-mainnet`, `#how-fpcs-work`, and the new private FPC guide) - [ ] Verify external links to Nethermind and Wonderland repos are valid
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Summary
PrivateFeePaymentMethod/PublicFeePaymentMethodSDK classes (do not work on mainnet alpha)Files changed
docs-developers/docs/aztec-js/how_to_pay_fees.md— third-party FPC section, Nethermind example, deprecation notice, table reformattingdocs-developers/docs/foundational-topics/fees.md— new "How FPCs work" section, teardown clarification, link fixdocs-developers/docs/aztec-js/how_to_create_account.md— updated link text and anchor to match renamed headingdocs-participate/basics/fees.md— rewritten fee-paying contracts sectionTest plan
yarn start— verify dev server starts and all four changed pages render correctly#sponsored-fpc-devnet-and-local-only,#third-party-fpcs-on-testnet-and-mainnet,#how-fpcs-work) resolve#include_codesnippets still render in the how-to-pay-fees and how-to-create-account pagesyarn spellcheckpasses