feat: add Radius Network support (eip155:723487)

[TJ-Frederick]

Summary

Add Radius Network (chain ID 723487) and its testnet (chain ID 72344) to the Rust and Python implementations of plugin-evm. The TypeScript implementation already picks up Radius automatically via viem/chains (SupportedChain = keyof typeof viemChains), so only the README needs updating there.

Radius Network is an EVM-compatible platform purpose-built for agentic micropayments — sub-penny costs (~$0.0001/tx), sub-second finality (~500ms), and stablecoin-native gas (RUSD). It's a natural fit for plugin-evm's agent payment workflows.

Chain details

	Chain ID	RPC	Explorer
Mainnet	723487	https://rpc.radiustech.xyz	https://network.radiustech.xyz
Testnet	72344	https://rpc.testnet.radiustech.xyz	https://testnet.radiustech.xyz

Native currency: RUSD (Radius USD, 18 decimals).

Registered in viem 2.48.0 as radius / radiusTestnet, and in ethereum-lists/chains (PR #8168, merged).

Links

• Website: https://radiustech.xyz
• Docs: https://docs.radiustech.xyz

Greptile Summary

This PR adds Radius Network (chain ID 723487) and Radius Testnet (chain ID 72344) to the Rust and Python implementations of plugin-evm, and updates the README — the TypeScript layer already picks up the chain automatically via viem/chains. All chain metadata (RPC URLs, native symbol RUSD, is_testnet flag) is correct and consistent across both languages, and the new variants are fully covered by the extended test suites.

Confidence Score: 5/5

Safe to merge; all remaining findings are P2 style suggestions about the pre-existing serde/Display naming gap and missing display assertions in tests.

Chain IDs, RPC URLs, native symbol, and testnet flags are all correct and consistent across Rust and Python. Tests are comprehensive. The only noteworthy issue is the pre-existing serde rename_all = 'lowercase' mismatch for multi-word chain names — RadiusTestnet follows the same pattern as BaseSepolia, which already exists in the codebase without observed breakage.

rust/src/types.rs warrants a follow-up to address the serde/Display inconsistency for both RadiusTestnet and BaseSepolia, but this is not blocking.

Important Files Changed

Filename	Overview
rust/src/types.rs	Adds Radius/RadiusTestnet chain variants with correct chain IDs, RPC URLs, native symbol, and testnet flag; serde(rename_all = 'lowercase') creates a latent mismatch between wire format and Display for multi-word names.
python/elizaos_plugin_evm/types.py	Adds RADIUS and RADIUS_TESTNET enum members with correct chain ID, symbol, RPC URL, and is_testnet flag; consistent with the rest of the Python implementation.
rust/tests/integration_tests.rs	Adds chain_id, native_symbol, HTTPS RPC, testnet, and from_str tests for Radius/RadiusTestnet; Display and serde roundtrip tests are not extended to the new chains.
python/tests/test_types.py	Updates testnet set and chain count to 16; thorough coverage of the new chains.
README.md	Adds Radius Network and Radius Testnet rows to the supported chains table with correct chain IDs and RUSD symbol.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[SupportedChain input] --> B{FromStr lookup}
    B -->|radius| C[Radius - chain ID 723487]
    B -->|radiustestnet or radius-testnet| D[RadiusTestnet - chain ID 72344]
    C --> E[symbol: RUSD\nrpc: rpc.radiustech.xyz\nis_testnet: false]
    D --> F[symbol: RUSD\nrpc: rpc.testnet.radiustech.xyz\nis_testnet: true]
    E --> G[Display → radius\nSerde → radius]
    F --> H[Display → radiusTestnet\nSerde warning → radiustestnet]

Loading

Comments Outside Diff (2)

1. rust/src/types.rs, line 11 (link)

   Serde serialisation diverges from Display for RadiusTestnet

   #[serde(rename_all = "lowercase")] serialises RadiusTestnet as "radiustestnet", but Display returns "radiusTestnet" and the Python enum value is "radiusTestnet". This means serde_json::from_str::<SupportedChain>("\"radiusTestnet\"") would silently fail while "radiustestnet" succeeds — a mismatch between the serde wire format and what to_string() produces.

   This pre-existing gap also affects BaseSepolia (serde: "basesepolia" vs Display: "baseSepolia"). Adding a per-variant rename on both would align all representations:

   #[serde(rename = "radiusTestnet")]
   RadiusTestnet,

   The same fix applied to BaseSepolia would close the pre-existing gap too.

2. rust/tests/integration_tests.rs, line 325-330 (link)

   test_chain_display and serde tests not extended to Radius chains

   The existing test_chain_display test covers BaseSepolia and Zksync but the new chains are not tested. Similarly, test_chain_serde_all only covers single-word variants and deliberately skips multi-word ones (where the serde/Display mismatch would surface). Adding assertions here would catch the "radiusTestnet" → "radiusTestnet" Display roundtrip and make the serde gap visible:

   // in test_chain_display
   assert_eq!(SupportedChain::Radius.to_string(), "radius");
   assert_eq!(SupportedChain::RadiusTestnet.to_string(), "radiusTestnet");

_{Reviews (1): Last reviewed commit: "feat: add Radius Network support (eip155..." | Re-trigger Greptile}

Summary by CodeRabbit

Release Notes

• New Features

  • Added support for Radius Network (mainnet) and Radius Testnet to the EVM plugin, enabling users to interact with these chains alongside existing supported networks.

• Tests

  • Updated test coverage to validate chain properties and network identification for the newly added networks.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 0d646663-d5df-48d6-904e-8921e19b0313

📥 Commits

Reviewing files that changed from the base of the PR and between 4e720f0 and fc3ca16.

📒 Files selected for processing (5)

• README.md
• python/elizaos_plugin_evm/types.py
• python/tests/test_types.py
• rust/src/types.rs
• rust/tests/integration_tests.rs

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Walkthrough

Added support for two new blockchain networks (Radius Network and Radius Testnet) to the EVM plugin. Chain identifiers, native symbols, RPC endpoints, and testnet classifications were integrated into Python and Rust codebases along with corresponding test coverage updates.

Changes

Cohort / File(s)	Summary
Documentation README.md	Added Radius Network (chain ID 723487) and Radius Testnet (chain ID 72344) entries to the "Supported Chains" table with RUSD as native token.
Python Implementation python/elizaos_plugin_evm/types.py	Added RADIUS and RADIUS_TESTNET enum members to SupportedChain and extended chain_id, native_symbol, and default_rpc property mappings with corresponding values. Updated is_testnet() logic to classify RADIUS_TESTNET as a testnet.
Python Tests python/tests/test_types.py	Updated test expectations: added Radius chains to EXPECTED_CHAIN_IDS and EXPECTED_SYMBOLS dictionaries, modified testnet assertions to include RADIUS_TESTNET, and adjusted enum count expectation to 16.
Rust Implementation rust/src/types.rs	Added Radius and RadiusTestnet variants to SupportedChain enum with complete implementations for chain_id(), native_symbol(), default_rpc(), is_testnet(), Display, and FromStr trait methods.
Rust Tests rust/tests/integration_tests.rs	Extended integration tests to validate chain IDs (723487, 72344), native symbol ("RUSD"), RPC URL validity, testnet classification, and string parsing including alternative aliases ("radius-testnet", "radius_testnet").

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Poem

🐰 Two new chains hop into view,
Radius mainnet and testnet too,
With RUSD tokens shining bright,
RPC endpoints set just right,
Python and Rust in harmony! 🌟

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 71.43% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'feat: add Radius Network support (eip155:723487)' directly and clearly summarizes the main change: adding support for Radius Network (mainnet with chain ID 723487), which is the primary focus of the changeset across README, Rust, and Python implementations.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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