feat(dexscreener): add DexScreener action provider for real-time DEX pair data

[bennytimz]

Summary

Adds a new action provider for DexScreener, the most widely used DEX aggregator covering 80+ blockchains and 1000+ DEXes. No API key or authentication required.

DexScreener is listed in WISHLIST.md under Trading & Data.

Actions Added

Action	Description
search_dexscreener_pairs	Search for trading pairs by token name, symbol, or contract address
get_dexscreener_pairs_by_token	Get all pairs for a token on a specific chain, sorted by 24h volume
get_dexscreener_pair	Get detailed data for a specific pair by contract address

Example prompts

Search DexScreener for USDC pairs
Find all trading pairs for WETH on Base
Get the current price and 24h volume of cbBTC on Base
What is the most liquid DEX pair for ETH on Arbitrum?

Implementation Notes

• Pure HTTP reads against the public DexScreener API — no wallet required, no API key
• Follows the exact same pattern as the existing defillama action provider
• Responses pruned to top N pairs by 24h volume to keep output concise for agents
• supportsNetwork returns true for all networks (DexScreener covers 80+ chains)
• All actions return structured JSON strings consistent with existing provider patterns

Tests

17/17 tests passing. Coverage includes:

• Happy path for all 3 actions
• Empty/null response handling
• HTTP error handling (404, 429, 500)
• Network failure handling
• Result limiting (max 10 for search, configurable for token pairs)
• Volume-based sorting for get_dexscreener_pairs_by_token
• Fallback from pair field to pairs[0] in get_dexscreener_pair

Checklist

• Tests added and passing (pnpm test -- --testPathPattern=dexscreener)
• Lint passing (pnpm run lint)
• Format passing (pnpm run format)
• Changeset created
• Export added to action-providers/index.ts
• README included
• Listed in WISHLIST.md

[cb-heimdall]

🟡 Heimdall Review Status

Requirement	Status	More Info
Reviews	🟡 0/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 1 Sum 2

[cb-heimdall]

Review Error for MVPuknowme @ 2026-04-19 23:05:08 UTC
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[cb-heimdall]

Review Error for MVPuknowme @ 2026-04-19 23:05:59 UTC
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