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 — agent card resolver / erc-8004 identity registry lookup / trustless agents / agentid → owner + agenturi / a2a identity / agent.json fetch…

SYNOPSIS

POST https://x402.org/v1/agent-card-resolve
     Content-Type: application/json
     X-PAYMENT:    <signed-transferWithAuthorization>

     { ... }

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

DESCRIPTION

Agent card resolver / ERC-8004 Identity Registry lookup / Trustless Agents / agentId → owner + agentURI / A2A identity / agent.json fetch / on-chain agent metadata. Pass an ERC-8004 agentId (uint256 on Base) — returns the on-chain 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.

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.org/v1/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 once
claude mcp add x402 --command "npx x402-deployer-mcp"

# then ask Claude Code:
# "use the agent-card-resolve tool to ..."

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

ADJACENT — other endpoints in edgemarket

endpoint	description	price
arbitrage-spread	Cross-exchange arbitrage spread / max-min price / CEX price dispersion / spread % calculator.	$0.005
basename-resolve	Basename resolver / Coinbase Basenames / .base.eth lookup / Base name service / on-chain name resolution.	$0.005
defi-yield-pools	DeFi yield pools / APY aggregator / yield-farming opportunities / DeFiLlama yields / cross-protocol APY ranking / stablecoin yields / LP…	$0.005
ipfs-fetch	IPFS fetch / IPFS gateway / Web3 storage retrieval / NFT metadata fetcher / Filecoin gateway / decentralized content / pinned-content reader.	$0.005
price-impact	Price-impact / slippage estimator / DEX swap size impact / size-keyed quote / depth simulation.	$0.005
safe-multisig-status	Safe multisig status / Gnosis Safe info / Safe owners / Safe threshold / Safe pending queue / DAO treasury wallet / Safe wallet lookup.	$0.005
stablecoin-monitor	Stablecoin monitor.	$0.005
stablecoin-peg	Stablecoin peg monitor / depeg detector.	$0.005

/agent-card-resolve(1)