Chore/fetcher extra params

[Velenir]

Extra parameters to pass to fetcher (axios, fetch, or custom in simpleSDK)

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Note

Medium Risk
Touches shared request construction logic across all SDK API calls; incorrect header merge precedence or keepalive usage could subtly change request behavior for existing consumers.

Overview
Adds support for passing extra request headers via ExtraFetchParams and ensures they are merged into outgoing requests for constructAxiosFetcher, constructFetchFetcher, and the SimpleSDK custom fetcher path (including when an apiKey is set).

The fetch-based fetcher now optionally forwards keepalive, and ExtraFetchParams is exported from src/index.ts for external typing. Also updates the documented default version for /prices rate queries to 6.2, and bumps package.json to 9.3.2-dev.1.

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[github-actions]

size-limit report 📦

Path	Size
dist/sdk.cjs.production.min.js	15.83 KB (+0.04% 🔺)
dist/sdk.esm.js	15.75 KB (+0.38% 🔺)

[Copilot]

Pull request overview

This PR adds support for passing extra parameters to fetcher functions, specifically adding a headers field to ExtraFetchParams and a keepalive option for the fetch implementation.

Changes:

• Extended ExtraFetchParams type to include optional headers field
• Updated axios, fetch, and simple SDK fetcher implementations to merge extra headers with request headers
• Added keepalive parameter support for the fetch-based fetcher
• Exported ExtraFetchParams type for external use
• Updated documentation for swap rate protocol version default from 5 to 6.2

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/types.ts	Extended ExtraFetchParams to include optional headers
src/helpers/fetchers/axios.ts	Updated header merging to include extra headers from options
src/helpers/fetchers/fetch.ts	Updated header merging to include extra headers and added keepalive parameter support
src/sdk/simple.ts	Updated custom fetcher wrapper to merge extra headers
src/index.ts	Exported ExtraFetchParams type for public API
src/methods/swap/rates.ts	Updated documentation for protocol version default value

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Cursor Bugbot has reviewed your changes and found 3 potential issues.

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