Herald Protocol is the infrastructure for the agentic economy on 0G Chain.
AI agents need to pay and get paid without humans in the loop. Herald ships the economic rails so agents can transact with other agents, APIs, and services natively on 0G.
Agent payments are live on 0G Chain, powered by x402 as the first supported rail. Any API, MCP server, or AI agent can accept onchain payments through our facilitator — no middlemen, no off-chain escrow, just HTTP + settlement on 0G.
- Facilitator URL: https://facilitator.heraldprotocol.xyz/
- Supported token: USDC.e — swap via hub.0g.ai
- Drop-in compatible with the x402 spec — plug it into any HTTP server or agent client
There's no official USDC testnet on 0G right now, which makes the dev loop painful. We're shipping our own EIP-3009-compatible test token so you can build and test x402 flows end-to-end. We're also wiring up Permit2 so any ERC-20 can be used as a payment token, not just EIP-3009 ones. Landing soon.
Not every service accepts payment on 0G. The Herald Router bridges that gap: agents hold funds on 0G and pay any x402-protected service across supported routes, without juggling multiple chains or bridging manually.
- Pay from 0G, settle wherever the service lives
- One wallet, one balance, multiple destination chains
- Same x402 interface — the router handles the cross-chain mechanics
- Permit2 gas sponsoring — accept any ERC-20 as payment, no native token required from the payer
- More payment rails — additional settlement protocols beyond x402, so agents can pay however the counterparty expects
- EIP-3009 test token on 0G — unblock the dev loop until an official USDC testnet lands
- mpp support — native integration with the machine payment protocol for broader agent-to-agent payment interoperability
0G is an EVM-compatible L1 with sub-second finality, decentralized storage, and a compute marketplace — a natural home for agent-native apps. Herald gives those agents the economic rails to transact and get paid from day one.