Chore/fetcher extra params

[Velenir]

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

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Note

Medium Risk
Changes request header composition for all fetcher paths, which could alter authentication/caching behavior or override user-provided headers. Other updates are type-level/query-param additions with limited runtime risk.

Overview
Adds richer extra fetcher params across axios/fetch/simple fetchers by extending ExtraFetchParams with optional headers, merging them into request headers (alongside X-API-KEY), and allowing fetch requests to pass through keepalive.

Extends public API types to support partner fee configuration via partnerFeeBps on getDeltaPrice, getQuote, and swap RateOptions, and updates docs/tests accordingly (including snapshot expectations for dynamic partnerFee and bridge protocol icon fields).

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[github-actions]

size-limit report 📦

Path	Size
dist/sdk.cjs.production.min.js	15.83 KB (0%)
dist/sdk.esm.js	15.75 KB (0%)

[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]

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

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[andriy-shymkiv]

I'd like to ask you about adding partnerFeeBps query param to Delta and Market price params 🙏🏻

[Velenir]

I'd like to ask you about adding partnerFeeBps query param to Delta and Market price params 🙏🏻

Added, maybe will also add to /quote, depending on BE