arbitova

Non-custodial USDC escrow for agent-to-agent payments on Base.

Two agents lock USDC into a contract, one delivers, the other confirms or disputes, and a neutral arbiter resolves. Arbitova never holds the money — the contract does.

No API keys. No registration. No custody. Your Ethereum address is your identity.

pip install arbitova

Contract: 0xA8a031bcaD2f840b451c19db8e43CEAF86a088fC on Base Sepolia (mainnet launching after audit) Spec: A2A-ESCROW-RFC-v0.1 Live UI: arbitova.com/pay

Why this exists

Every A2A / agent-commerce spec in the wild — MCP, Google's A2A, ERC-7683, Coinbase's Agent Commerce — defines how agents talk. None of them define how money moves when the agents don't trust each other.

Arbitova is the missing settlement primitive:

• Deterministic state machine. createEscrow → markDelivered → {confirmDelivery | dispute → resolve | cancel}. No hidden branches, no admin override.
• No auto-release after timeout. Review windows expire into DISPUTED, not into seller payout. Silence is safer than a wrong confirmation.
• Content-hash pinned on-chain. Sellers can't swap the delivery file after the buyer inspects.
• Verdict transparency. Every arbiter decision, its reasoning, the ensemble vote breakdown, and the content-hash integrity data is published per-case at arbitova.com/verdicts.

This is not a marketplace. There is no Arbitova account, no listing fee, no Arbitova Pro tier. The protocol is the whole product.

Dispute publicity

If an escrow is disputed and resolved by Arbitova arbitration, the verdict, reasoning, and ensemble vote breakdown are published per-case at arbitova.com/verdicts. The delivery payload itself is not published (only its keccak256 hash). Your wallet address is already public on-chain. See the transparency policy.

30-second quickstart

Both sides need a Base Sepolia private key with some test USDC + a pinch of ETH for gas. Faucet: https://faucet.circle.com/ (Base Sepolia USDC) · gas: https://www.alchemy.com/faucets/base-sepolia

Buyer

import os
from arbitova import path_b

os.environ["ARBITOVA_RPC_URL"] = "https://sepolia.base.org"
os.environ["ARBITOVA_CHAIN_ID"] = "84532"
os.environ["ARBITOVA_ESCROW_ADDRESS"] = "0xA8a031bcaD2f840b451c19db8e43CEAF86a088fC"
os.environ["ARBITOVA_USDC_ADDRESS"] = "0x036CbD53842c5426634e7929541eC2318f3dCF7e"
os.environ["ARBITOVA_PRIVATE_KEY"] = "<buyer_private_key>"

result = path_b.arbitova_create_escrow(
    seller_address="0xSellerAddressHere",
    amount_usdc="5.00",
    delivery_hours=24,
    review_hours=24,
    verification_uri="https://example.com/spec.json",
)
print(f"Escrow #{result['escrow_id']} — tx {result['tx_hash']}")

Seller

import os
from arbitova import path_b

os.environ["ARBITOVA_PRIVATE_KEY"] = "<seller_private_key>"
# (other env vars same as buyer)

result = path_b.arbitova_mark_delivered(
    escrow_id=1,
    delivery_payload_uri="https://example.com/receipt.json",
    delivery_content_bytes=b"hello, buyer",  # content-hash pinned on-chain
)
print(f"Delivered — tx {result['tx_hash']}")

Buyer confirms (happy path)

path_b.arbitova_confirm_delivery(escrow_id=1)
# Contract pays seller (amount − 0.5% release fee) atomically.

Or: buyer disputes → Arbitova resolves

path_b.arbitova_dispute(escrow_id=1, reason="Delivery did not match spec section 3.2")
# Arbitova signer runs AI arbitration off-chain, then calls resolve() with the split.

API reference (Path B — on-chain)

Fees (contract-level)

No Arbitova balance to top up. No invoices. Fees are collected on-chain in USDC when the contract releases funds.

Links

• Website: https://arbitova.com
• Pay UI: https://arbitova.com/pay
• Verdicts dashboard: https://arbitova.com/verdicts
• Spec (RFC v0.1): https://github.com/jiayuanliang0716-max/Arbitova/blob/master/spec/A2A-ESCROW-RFC-v0.1.md
• GitHub: https://github.com/jiayuanliang0716-max/Arbitova
• Transparency policy: https://github.com/jiayuanliang0716-max/Arbitova/blob/master/docs/transparency-policy.md
• npm (JS SDK): https://www.npmjs.com/package/@arbitova/sdk
• MCP server: https://www.npmjs.com/package/@arbitova/mcp-server