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SperaxOS ERC-8004 Agent Metadata Lookup
x402
SperaxOS ERC-8004 Agent Metadata Lookup is a paid API for AI agents from chat.sperax.io, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-22).
Retrieves a specific metadata key for an ERC-8004 on-chain agent by token ID from a specified blockchain network
Price / call$0.001
Success—
StatusUnknown
How this service works
AI-powered DeFi intelligence APIs payable via the x402 HTTP payment protocol. No API key required — pay per request with USDC on Base. Identity-only (SIWX) endpoints are free for wallets with an agentcash identity.
Output
Returns the value associated with the requested metadata key for the specified ERC-8004 agent token on the given blockchain. Typically a string value such as a URL, version string, or descriptive text stored on-chain for that agent.
Example use cases
Resolve agent A2A endpoint on-chain
“Can you fetch the 'a2a.endpoint' metadata for agent token ID 17 on bsc-mainnet so I know where to send agent-to-agent messages?”
Check on-chain agent version
“What is the 'version' metadata stored for ERC-8004 agent token 5 on Ethereum mainnet?”
Inspect agent config on testnet
“Pull the 'description' metadata key for agent token ID 99 on bsc-testnet — I'm debugging my agent's on-chain registration.”
Technical details
Endpoint
POSThttps://chat.sperax.io/api/x402/tools/erc8004/getMetadata?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to look up specific ERC-8004 on-chain agent metadata by token ID and key, especially when querying BSC, Ethereum, or Sepolia networks. Prefer this over generic blockchain RPC calls when you want a structured, pay-per-use API without managing API keys, and when the metadata standard is ERC-8004.
Side effects
- Agent token ID does not exist on the specified chain — returns an error or null value
- Invalid or unrecognized metadata key — returns empty or null result
- Unsupported chain specified — returns validation error
- Payment failure via x402 protocol — request blocked before execution
- Network or RPC timeout when querying the blockchain
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| key | string | Metadata key to look up (e.g., "version", "a2a.endpoint") |
| chain | string | Blockchain to query. Options: bsc-testnet, bsc-mainnet, ethereum, sepolia |
| agentId | number | The token ID of the agent |
Tags
x402
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