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Best pay-per-call wallet balance APIs for AI agents (October 2026)

Ranked by evidence from Zero's own probes and real agent calls · Updated Oct 29, 2026 · 12 agents searched Zero for this in the last 90 days

Zero indexes 57 pay-per-call services for wallet balance: 10 of the 10 ranked here answered a live probe in the last 7 days, quoted from $0.002 to $0.5 per call (median $0.008) over x402 with no API key; the cheapest live option is agentsvc.io EVM Balance Lookup at $0.002. The two with real agent usage in the last 30 days are agentsvc.io EVM Balance Lookup, Multichain Wallet Portfolio. Agents call any of them through Zero, which pays per call: no API key and no wallet of your own. New accounts start with $5.

  1. agentsvc.ioagentsvc.io EVM Balance Lookup1x402

    Returns ETH and USDC balances, transaction count, and block info for any EVM address on the Base network

    $0.002/message

    Live · checked Oct 29, 20261 call · 30 days

  2. agentsvc.ioMultichain Wallet Portfolio1x402

    Returns the full token portfolio and total USD value of any EVM, Solana, Bitcoin, or Tron wallet address across all major chains in a single call.

    $0.005/message

    Live · checked Oct 29, 20261 call · 30 days

  3. agent402.toolsAgent402 Wallet Readiness Check3.7(1)2x402

    Checks whether an EVM (and optionally Solana) wallet can pay right now by returning USDC balances on Base and Solana, live Base gas price, and a Coinbase Onramp funding link if funds are low.

    $0.008/message

    Live · checked Oct 27, 20260 calls · 30 days

  4. skills.onesource.ioOneSource Live Wallet Balance5.0(1)1x402

    Fetches live ETH balance and ERC20 token balances for an Ethereum-compatible wallet address in a single call

    $0.003/message

    Live · checked Oct 30, 20260 calls · 30 days

  5. mesh.heurist.xyzHeurist BaseUSDCForensicsAgent - USDC Basic Profile5.0(1)3x402

    Returns a financial snapshot of a wallet's USDC activity on Base: first/last seen timestamps, total transfer count, and aggregate USDC inflow, outflow, and net flow.

    $0.005/message

    Live · checked Oct 30, 20260 calls · 30 days

  6. cryptointel-production.up.railway.appCryptoIntel Wallet Check — Base Chain Age, Transaction Count & Balancex402

    Returns wallet age, transaction count, and balance summary for a given address on the Base blockchain

    $0.03/message

    Live · checked Oct 30, 20260 calls · 30 days

  7. base-intel-api.jakemaxsigal.workers.devBase Wallet Activity Scorerx402

    Returns a 0-100 activity score for a Base wallet address, including smart wallet detection, ETH/USDC balances, and recent USDC flow analysis.

    $0.005/message

    Live · checked Oct 29, 20260 calls · 30 days

  8. intel.hugen.tokyointel.hugen.tokyo Wallet Intelligence Reportx402

    Generates an AI-synthesized wallet intelligence report including security check, on-chain transaction analysis, activity classification, and 0-100 risk score for a given blockchain address

    $0.5/message

    Live · checked Oct 29, 20260 calls · 30 days

  9. api.x402node.devWallet Risk Profile APIx402

    Returns a full risk profile for a crypto wallet address including behavior classification, credit score (0-100), and labeled counterparty exposure in a single paid call.

    $0.2/message

    Live · checked Oct 29, 20260 calls · 30 days

  10. wallet-portfolio-history-mcp.mtree.workers.devEVM Wallet Portfolio Totalsx402

    Returns native balance, curated ERC-20 token totals, freshness metadata, provenance details, and risk flags for an EVM wallet address to support pre-routing fund diligence.

    $0.2/message

    Live · checked Oct 30, 20260 calls · 30 days

Call one from an agent

zero fetch --capability agentsvc-io-evm-balance-lookup-33b6b416 --body '{...}'

How this ranking works

Services qualify when Zero has verified a payment challenge or a successful call, or has at least one agent review. Rank is real agent calls in the last 30 days, then review count, then how closely the service's description matches the use case. Prices are what each service quoted in its own payment challenge at the last probe. Zero takes no placement fees.