Changelog

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How deprecations work

• The contract is the base URL plus your key. https://nexus.gerowallet.io/api/... with an X-Api-Key, and https://nexus.gerowallet.io/api/v0 with a project_id, do not change.
• Additive changes ship without notice: new endpoints, new optional query parameters, new fields in a response.
• Breaking changes are announced here first, with a minimum of 30 days between the notice and the change, and the old behaviour kept for that window. A breaking change is a removed endpoint, a removed or renamed response field, a changed default, or a tightened validation rule.
• If a change reaches you without a notice here, it is a bug on our side. Email nexus@gerowallet.io.

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2026-09

• API reference: 59 operations that had no page now have one, including all ten Conway governance operations, the six aggregator endpoints, the Policy family, transaction metadata and ADA Handles. The docs sitemap went from 154 to 213 URLs.
• Every Cardano operation page is retitled as the task it performs: “Get all UTxOs for a Cardano address”, “Submit a signed Cardano transaction”, “Query the votes cast by a Cardano DRep”. Page URLs follow the titles; every previous URL redirects permanently to its new address. No path, parameter or response shape changed.
• Trial funnel metrics endpoint for the control panel scoreboard, internal only.
• Midnight: preview network retired, stagenet added. The supported set is now stagenet, preprod and mainnet; the midnight-preview path segment no longer resolves. On stagenet the read path (info, indexer, DUST state) is on, and transaction build and submit are refused with a clear error until the sidecar moves to the ledger version stagenet runs. No customer key was scoped to preview.
• Epoch parameters: cost models are served as arrays alongside the existing object form on GET /api/epoch/latest/parameters and GET /api/epoch/params. Additive.
• Cardano: 23 endpoints added to close the Maestro gap, served from Nexus’s own indexers and chain database. Addresses: decode, bulk POST /api/addresses/utxos (50 per call), transactions/count, credential balance plus bulk credential UTxOs and transactions (25 per call). Accounts: delegations, updates, history, cursor-paged. Assets: mints, accounts, transactions; policies: mints, addresses, accounts, transactions. Epochs: GET /api/epoch/{epochNo}. Network: era-summaries, system-start. Scripts: bulk POST /api/scripts/datums (100 per call). Handles: GET /api/handles/{handle}. Pools: GET /api/pools/{poolId}/delegators, and the compatible /api/v0/pools/{pool_id}/delegators is now served natively instead of guarded. Full map on Migrate from Maestro.
• Transaction script data on mainnet and credential-read timeouts fixed (reported by FluidTokens).

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2026-08

• Bitcoin API expanded to Maestro parity: address inscriptions, runes and ordinals, mempool transactions, fee estimates, bulk transaction reads, and mainnet electrs enabled. Map on Migrate from Maestro: Bitcoin.
• Koios-backed reads fill UTxO chain facts and block metadata that the upstream tx_info leaves out. Additive; same response shapes.
• Blog posts prerendered on the marketing site (no API change).
• Governance: GET /api/dreps widened to the single-source-of-truth contract; committee vote rows carry a join key to the committee endpoint; getProposalVotes gained a Koios fallback. Additive.
• Blockfrost-compatible surface: a native-reshape router for the guarded pool paths, dark by default. No behaviour change until enabled.
• Stake pools: GET /api/pools gained search, sort and paging, with CIP-0149 per-mille validation on inputs. Additive.
• Registration: Cloudflare Turnstile on sign-up, shipped dark.

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2026-07

• Assets: registry-metadata proxy backed by the Nexus token registry. Additive.
• Batch transaction reads served from direct SQL behind a flag. Same shapes.
• IPFS add-on: plain GET /api/ipfs relays the gateway Content-Type.
• Rate limiting: Redis-backed distributed limit, dark and flag-gated; per-tier numbers on Rate Limits unchanged.
• Stake pools: pool history gained a real provider fallback plus count and page.
• Observability: nexus_tip_lag_ms gauge; verified txSize and deposit limits documented.
• Billing: two-phase trial grants, card fingerprinting, per-IP checkout throttle. No API change for data calls.
• Support chat: non-custodial live-chat identity minting at /api/support/chat for the GeroWallet extension.

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