# Sumeria Base Counterparty Profile

> Sumeria Base Counterparty Profile is a paid API for AI agents from x402.sumeria.ar, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-27).

Returns a blockchain profile for a Base address including account type, nonce, ETH and USDC balances, and 7-day USDC flow statistics, to help evaluate unknown payees before sending funds.

## Facts

- Endpoint: GET https://x402.sumeria.ar/v1/base/perfil/:direccion?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-27
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sumeria-base-counterparty-profile-3bd6daf5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_iSgbDccSHd3R8BuyVNxao

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

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability sumeria-base-counterparty-profile-3bd6daf5
```

Example prompt: Before I pay this Base address 0x1a2b3c4d5e6f7890abcdef1234567890abcdef12, can you pull its counterparty profile — I want to know if it's an EOA or contract, its current ETH and USDC balances, and how much USDC it's been sending and receiving over the past 7 days?

## When to prefer this

Choose this endpoint when you need objective, on-chain facts about a Base address before initiating a payment — particularly for unknown payees. It is ideal for pre-payment due diligence because it provides account type classification, balance snapshot, and 7-day USDC flow without subjective scoring. Prefer this over generic blockchain explorers when you need structured, machine-readable output ready for agent decision-making.

## Known failure modes

- Invalid or malformed Ethereum address returns a 400 error
- Address not found or never used on Base may return zero balances with minimal data
- RPC or node connectivity issues may cause timeouts or 503 errors
- Rate limiting or payment failure (x402) results in 402 Payment Required
- Very new addresses with no transaction history return zeros across flow metrics

## How this service works

Perfil de contraparte en Base: tipo (EOA, EOA con EIP-7702 o contrato), nonce, saldos de ETH y USDC, y flujo de USDC de los últimos 7 días (recibido, enviado, contrapartes y pagadores distintos). Hechos con número de bloque, sin puntajes. Útil antes de pagarle a un payTo desconocido.

## Output

Returns a JSON object containing the address's account type (EOA, EOA with EIP-7702, or contract), current nonce, ETH balance, USDC balance, total USDC received in last 7 days, total USDC sent in last 7 days, count of distinct counterparties and distinct payers, all anchored to a specific block number for auditability. No reputation scores — only on-chain facts.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sumeria-base-counterparty-profile-3bd6daf5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.sumeria.ar](https://www.zero.xyz/host/x402.sumeria.ar/llms.txt)