The Graph Indexes ERC-8004 Agents Across Five Major Blockchains

**The Graph Network now supports x402 payments**, allowing AI agents to query blockchain data and pay autonomously without API keys or pre-configuration. **Key features:** - Pay-per-query in USDC over HTTP - No accounts, sessions, or setup required - Machine-native payments end-to-end **How it works:** The system uses GraphTally for settlement, processing signed receipts offchain in microseconds with no gas fees. Indexers aggregate receipts into batches and settle onchain in single transactions. **Why it matters:** x402 revives HTTP 402 (Payment Required) as a machine-native billing standard for the agentic web. The Graph has run this pattern in production since early 2025, now standardized for broader adoption. Read more: [Understanding x402 and ERC-8004](http://thegraph.com/blog/understanding-x402-erc8004/)

The Graph published guidance on choosing between two data solutions for blockchain applications. **Key differences:** - **Subgraphs**: Best for structured, queryable onchain data in user-facing applications - **Substreams**: Designed for high-throughput data pipelines that can send data to multiple destinations The choice depends on your specific use case - neither solution replaces the other. Both tools address different aspects of accessing blockchain data and serve as infrastructure for the emerging agent economy. [Read the full comparison guide](https://thegraph.com/blog/subgraphs-or-substreams-blockchain-data-solution/)

**AI agents operate at machine speed**, making thousands of decisions per minute in the crypto economy. Unlike humans who browse block explorers, these agents require **structured, normalized, and queryable blockchain data** to function effectively. - Agents assessing DeFi risk cannot work with raw transaction logs - They need data formatted for rapid querying and decision-making - The infrastructure enabling this agent economy operates behind the scenes This represents a fundamental shift in how blockchain data must be organized and accessed. As AI agents become more prevalent in web3, the demand for **properly structured data infrastructure** will intensify dramatically. The agent economy isn't about human-readable interfaces—it's about machine-optimized data pipelines that can support thousands of automated decisions every minute.

**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.