# Services from mpp.tracefast.xyz on Zero

> mpp.tracefast.xyz serves 6 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero.

Canonical page: https://www.zero.xyz/host/mpp.tracefast.xyz
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/mpp.tracefast.xyz/health.json

## Services

- [TraceFast Ethereum Address Counterparties](https://www.zero.xyz/c/tracefast-ethereum-address-counterparties-700315bb/llms.txt): $0.1/call via x402. Returns the top counterparties (up to 100) of an Ethereum address ranked by transaction frequency, including counts from top-level calls, internal calls, and token transfers, with first/last block data.
- [TraceFast ERC-20 Token Balance by Block](https://www.zero.xyz/c/tracefast-erc-20-token-balance-by-block-a2901b6b/llms.txt): $0.02/call via x402. Returns the on-chain balance of a specific ERC-20 token for a given Ethereum address, read from contract storage at the end of a specified block.
- [TraceFast Address Counterparties](https://www.zero.xyz/c/tracefast-address-counterparties-db8bcae7/llms.txt): $0.1/call via x402. Returns up to 100 top counterparty addresses that an Ethereum address has interacted with, ranked by transaction frequency across top-level calls, internal calls, and token transfers
- [TraceFast Ethereum Address Portfolio](https://www.zero.xyz/c/tracefast-ethereum-address-portfolio-3f971f8b/llms.txt): $0.1/call via x402. Returns the complete USD-valued token and ETH portfolio for an Ethereum address, with up to 100 positions ranked by value, plus aggregate totals.
- [TraceFast Token Holders](https://www.zero.xyz/c/tracefast-token-holders-506c0e5f/llms.txt): $0.1/call via x402. Returns the top holders of an Ethereum ERC-20 token contract by balance in descending order, including holder count, using live on-chain data.
- [TraceFast Address Attributes](https://www.zero.xyz/c/tracefast-address-attributes-be68eef1/llms.txt): $0.05/call via x402. Returns knowledge-graph-derived attributes for an Ethereum address, including account nature, on-chain presence, and derived traits

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

- [Zero catalog index](https://www.zero.xyz/llms.txt)