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The {chain} path param is a friendly slug. Map of slug → CAIP-2 chain ID + Aegis coverage below. Aegis full coverage is currently limited to ETH, BSC, TRON — the only chains where we ingest the full transaction graph end to end. TON is supported on screen and check-address as a label-only network (see TON). Other chains return 400 unsupported_network on screen and check-address. check-transfer (KYT) decodes the transaction itself and accepts ETH, BSC, POLYGON, BASE, ARBITRUM, TRON and TON — see GET /check-transfer and POST /v2/check-transfer. The live matrix is always GET https://api.aegis-kyt.com/v2/networks. Aegis is the single verdict surface. Where the on-chain graph is sparse, additional commercial scoring runs under the hood (opt-in) and is folded into the same Aegis verdict — there is no separate multi-provider tier to select.

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Address format

A wrong-case TRON address won’t be found in our index — a 0x6b17… EVM address can be sent in any case and we’ll normalise.

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TON

TON is supported on screen, check-address, inspect-address and check-transfer (hash in hex, base64 or base64url). It is a label-only network: the verdict is built from labels, sanctions lists and external risk providers, plus one-hop counterparty analysis. There is no multi-hop transaction graph (no Tier 4, funder or reverse tracing), and the response says so explicitly in coverage instead of leaving fields out.
  • Transaction history is read in capped passes. For very active wallets (exchanges) only the most recent hours may be loaded, and volumes shown with ~ are estimates from the stored sample.
  • Only vetted jettons (USDT and ten others) are priced and shown; unlisted jettons are ignored.
  • The native coin is reported as TON (some third-party sites call it GRAM).
  • A deposit memo, when the partner flow carries one, is returned on the check result as memo.

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Settlement chain

Independent of {chain}. Today the x402 quote always settles on Base mainnet (or Base Sepolia for testnet calls), regardless of which chain you’re querying. Multi-chain settlement is on the roadmap.