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Merged
tvinagre merged 2 commits into from
Jul 21, 2026
Merged

feat: add hosted-API auth and per-chain routing to clients #325

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d4405cb
feat: add hosted-API auth and per-chain routing to clients
tvinagre Jul 18, 2026
4d63aaa
fix(client): send API key as raw Authorization header, not Bearer
tvinagre Jul 19, 2026
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24 changes: 23 additions & 1 deletion clients/CLAUDE.md
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Original file line number Diff line number Diff line change
Expand Up @@ -45,6 +45,21 @@ FyndClientBuilder::new(fynd_url)
FyndClientBuilder::new(fynd_url).build_quote_only()?
```

Against the hosted gateway (`fynd-api.propellerheads.xyz`), add auth and per-chain routing:

```rust
FyndClientBuilder::new("https://fynd-api.propellerheads.xyz")
.with_api_key(tycho_api_key) // sent as the raw `Authorization` header value (no `Bearer` prefix)
.with_chain("base") // routes to /v1/base/quote instead of /v1/quote
.build_quote_only()?
```

Both are opt-in; omitting them keeps the unauthenticated, unprefixed paths that self-hosted
Fynd serves. `with_chain` accepts `ethereum`, `base`, `arbitrum`, `bsc`, `polygon`, `unichain`
and rejects anything else at build time. It also determines the `chain_id` used for signing
when building via `build_quote_only` (no RPC node to ask); `build` cross-checks the slug
against the chain the RPC node reports and errors on a mismatch.

**`FyndClient`**
- `quote(params: QuoteParams) -> Result<Quote, FyndError>` — request a swap quote
- `batch_quote(params: BatchQuoteParams) -> Result<Vec<Quote>, FyndError>` — request multiple quotes in one call
Expand Down Expand Up @@ -81,7 +96,14 @@ For full details, see [`.claude/knowledge/typescript.md`](../.claude/knowledge/t
pnpm workspace at `clients/typescript/` with two packages: `client` and `examples/tutorial`.

- **`@kayibal/fynd-client`** (`client/`) — Typed HTTP client: `FyndClient`, signing, Permit2, error types.
Contains `autogen.ts` and `schema.d.ts` (generated from `openapi-typescript`; do not edit manually).
Contains `schema.d.ts` (generated by `scripts/update-openapi.sh`; do not edit manually) and
`autogen.ts` (a hand-maintained wrapper over `openapi-fetch`).

Hosted-gateway equivalents of the Rust builder options are `FyndClientOptions.apiKey` and
`.chain`, plus `.headers` for arbitrary headers. Chain routing is implemented as an
`openapi-fetch` middleware that rewrites `/v1/…` to `/v1/{chain}/…`, so call sites stay typed
against the generated schema literals. `createFyndClient` and the `Middleware` type are
re-exported from the package root for callers that want to add their own middleware.

### Build & Test

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