How Agent-to-Agent Marketplaces Work in 2026: A Technical Overview

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Autonomous AI agents are evolving into programmable micro-services capable of discovering, negotiating with, and paying other agents for compute, data, or specialised tasks. A developer guide published on DEV Community outlines the core components needed to build or use an agent-to-agent (A2A) marketplace, including a registry service, structured descriptor schema, messaging bus, and a settlement layer. The settlement layer uses ERC-20 contracts, specifically USDC on the Base blockchain, to lock and release funds based on proof of task completion. Standardised JSON-LD descriptors define each service's inputs, outputs, pricing, and SLA terms, and are made immutable via IPFS or on-chain storage so consumers can verify them before use. The guide also provides illustrative Python code demonstrating how an agent can query a registry, sign a request, escrow payment, and release funds upon successful service delivery.

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