Name: agent-card-resolve
Price: 0.005 USDC
Availability: InStock

$ man agent-card-resolve

agentutility / edge-market / agent-card-resolve

PRICE / CALL

$0.005

USDC · base mainnet · scheme: exact

METHOD

POST

CLUSTER

edgemarket

CATEGORY

uncategorized

STATUS

● live

NAME

agent-card-resolve — resolves an erc-8004 agentid to its on-chain owner, agenturi, and agent card json

SYNOPSIS

POST https://x402.agentutility.ai/agent-card-resolve
     Content-Type: application/json
     X-PAYMENT:    <signed-transferWithAuthorization>

     { ... }

↳ first call → 402 Payment Required. Sign USDCtransferWithAuthorization, retry with theX-PAYMENT header.

DESCRIPTION

Resolves an ERC-8004 agentId to its on-chain owner, agentURI, and agent card JSON. Pass an agentId (uint256 on Base) — returns the owner address, the agentURI from the Identity Registry, and the resolved agent card JSON (set fetch_card=false to skip the HTTP follow-up). Reads from Base mainnet Identity Registry 0x8004A169FB4a3325136EB29fA0ceB6D2e539a432 via a static eth_call (no gas, no wallet); useful for agents discovering peers in the A2A ecosystem. Use it as an agent card resolver, ERC-8004 Identity Registry lookup, Trustless Agents query, A2A identity check, agent.json fetch, or on-chain agent metadata reader.

INPUT — request schema

property	type	description	req?
agent_id	integer \| string	ERC-8004 agentId on Base — non-negative integer. Accepted as number or decimal string.	required
fetch_card	boolean	If true (default), also fetches the resolved agentURI and embeds the JSON agent card in the response. Set false to skip the HTTP fetch.	optional

OUTPUT — response shape

field	type	description
agent_id	number	ERC-8004 agentId (uint256) that was resolved on the Base Identity Registry.
network	string	Chain the registry was read from, e.g. "base" for Base mainnet.
identity_registry	string	Contract address of the ERC-8004 Identity Registry on Base used for the lookup.
owner	string	On-chain owner address returned by the Identity Registry for this agentId.
agent_uri	string	agentURI string stored on-chain for this agent, typically an https:// or ipfs:// URL.
agent_card	object	Resolved agent card JSON fetched from agentURI; null when fetch_card=false or fetch failed.
agent_card_fetch_error	stringnull	Error message if the agentURI HTTP fetch failed, otherwise null.
rpc_used	string	Base RPC endpoint URL that served the eth_call for the registry read.
source	string	Identifier of the resolver service that produced this response.
attribution	string	Credit string pointing back to the x402 agent-card-resolve endpoint.

EXAMPLES — two ways to call

EXAMPLE 1 · curl

curl -X POST https://x402.agentutility.ai/agent-card-resolve \
  -H 'Content-Type: application/json' \
  -d '{ }'

first response = 402 Payment Required with payment requirements; sign + retry with X-PAYMENT.

EXAMPLE 2 · mcp

# Install the MCP package for this endpoint's cluster
npx -y @agentutility/mcp-<cluster>

# Required: EVM private key with USDC on Base
export X402_PRIVATE_KEY=0x...

# Then call the agent-card-resolve tool from your MCP-aware agent.

MCP server handles payment automatically — your coding agent just calls the tool by name.

METADATA

tags: erc-8004agentidentityregistrytrustless-agentsa2abase
methods: POST
cluster: edgemarket
price: $0.005 USDC per call

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