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TraceFast Address Relations at Block
x402
TraceFast Address Relations at Block is a paid API for AI agents from mpp.tracefast.xyz, paid per call via x402, $0.025/call, status unknown (last checked 2026-10-12).
Returns the on-chain relations an Ethereum address held as subject at the end of a specific block, including proxy targets, beacon references, admin roles, and delegation links, each with the time window it was active.
Price / call$0.025
Success—
StatusUnknown
How this service works
TraceFast knowledge graph: the relations an address was the subject of at the end of one block — which implementation a proxy pointed at, which beacon it read, who administered it, where an account had delegated — each with the window it held for. Path address: The address, `0x`-prefixed, 40 hex characters, any case. Query block: The block to answer about. Docs: https://docs.tracefast.xyz/api/address-relations-at-block.md
Output
A list of relations where the queried address was the subject at the end of the specified block, each relation including the relation type (e.g. proxy-implementation, beacon, admin, delegation), the related counterparty address, and the window (start and end blocks) during which that relation was active.
Example use cases
Proxy upgrade audit at block
“I need to know what implementation contract 0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f was pointing to at block 18500000 — I'm trying to audit when the proxy was upgraded.”
Delegation check for governance analysis
“Can you look up what address 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 had delegated to at block 17000000? I'm analyzing their governance participation history.”
Admin role verification at historical block
“Who was the admin of 0xBA12222222228d8Ba445958a75a0704d566BF2C8 at block 18000000? I want to confirm who had control before the ownership transfer.”
Technical details
Endpoint
GEThttps://mpp.tracefast.xyz/api/v1/chains/1/entities/:address/relations/at-block?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need historical point-in-time relation data for a specific Ethereum address at a known block — particularly for proxy implementation lookups, beacon references, admin relationships, or delegation targets. Prefer this over current-state endpoints when auditing historical configurations, investigating upgrades, or reconstructing governance state at a past block.
Side effects
- Invalid address format (not 0x-prefixed 40 hex characters) returns 400 error
- Block number not yet indexed or in the future returns 404 or empty result
- Address with no known relations at that block returns empty list
- Network errors or timeout if block data is being processed
- Payment failure via x402 protocol if USDC balance is insufficient
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| input | — |
Tags
x402
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