The Graph Launches x402 Payment Package with Three Integration Options

**Agent0 Subgraphs are now live** across Base, BNB Chain, Ethereum, Monad, and Polygon, providing real-time indexing for ERC-8004 agents. **What's being indexed:** - Agent identity and capabilities - Reputation scores and validation data - Cross-chain agent activity **Key features:** - Single GraphQL query replaces complex blockchain scanning - Millisecond response times with no RPC limits - Unified schema works across all five chains - Already processed over 1M queries **Built with The Graph Protocol** as a public good, the subgraphs enable developers to query agent data without building custom indexers. This infrastructure supports emerging use cases like agent marketplaces, runtime discovery, reputation dashboards, and cross-chain analytics. The launch addresses a fundamental need as AI agents begin transacting autonomously on-chain, requiring structured, real-time blockchain data at machine scale.

**The Graph Gateway has introduced x402 payment support**, enabling direct pay-per-request access to Subgraph data without API keys or accounts. **Key features:** - Pay per query using USDC on Base or Base Sepolia - No registration, API keys, or session management required - Payment serves as authentication - One HTTP round trip: request → 402 response with price → sign USDC payment → retry → receive data **Implementation:** - Install via npm: `@graphprotocol/client-x402` - Access endpoints at `/api/x402/...` - [Documentation available](https://thegraph.com/docs/en/subgraphs/guides/x402-payments/) **Use cases:** Particularly useful for AI agents requiring onchain data like DEX activity, positions, governance, or protocol metrics. The system is live and available for testing on both Base mainnet and Base Sepolia testnet.

**The Graph Network is changing how developers access Subgraph data.** Previously, querying Subgraphs required a Subgraph Studio account and API key - a setup that worked for traditional apps but created friction for: - Autonomous agents - Serverless functions - Ephemeral workloads that spin up and down This barrier made it difficult for modern, dynamic applications to integrate blockchain data seamlessly. **The change enables more flexible access patterns** without the overhead of persistent credentials, particularly benefiting short-lived processes and automated systems that need to query data without manual setup.

**Agent0 Subgraphs are now operational across five major blockchain networks** - Base, BNB Chain, Ethereum, Monad, and Polygon - using a single GraphQL schema. **Key features:** - Real-time indexing of every ERC-8004 agent across all chains - No code rewrites needed when switching between networks - Already processed over 1 million queries - Accessible via [Graph Explorer](https://thegraph.com/explorer?search=agent0) **What this enables:** - Developers can query agent data with a single GraphQL request instead of scanning thousands of blocks - AI agents can discover, hire, and interact with each other using structured blockchain data - Machine-scale data access for agents that operate continuously The infrastructure indexes agent identities, capabilities, reputation, and validation data in milliseconds. Developers building ERC-8004 agents can now access comprehensive onchain data without building custom indexers.