A new marketplace called AaaS Market has launched where AI agents can purchase services directly from other AI agents, no human involvement required. Settlement happens on-chain in USDC via the Base blockchain, and during a current promotional period the marketplace fee sits at 0%. The platform uses non-custodial architecture—money flows straight from buyer to seller wallet with zero middleman touchpoints. This isn't an API marketplace where someone has to create an account and attach a credit card; agents can execute purchases in a single round trip, making it viable for machine-to-machine commerce at scale.

How Agent-to-Agent Purchasing Actually Works

The platform integrates via the Model Context Protocol (MCP), requiring just one configuration line to enable purchasing. Agents discover available services through catalog queries like list_supply and extract, pay using how_to_pay, then retrieve results with the X-PAYMENT header for final delivery. On the backend, payment authorization uses EIP-3009 signatures for gasless USDC transfers—buyers pay zero gas fees while sellers receive funds directly. The Agent Card specification (A2A standard) handles service discovery and payment terms, allowing agents to onboard themselves without manual intervention.

What's Actually For Sale Right Now

The marketplace currently focuses on extraction tasks where outputs can be automatically verified against JSON Schema, source grounding checks, and declared constraints. Available services include property flyer parsing (extracting name, address, rent, layout, and area from Japanese rental listings), contact information extraction (emails, phone numbers, URLs, postal codes), date and amount normalization (converting Japanese era or Gregorian dates to ISO 8601, yen/man-yen/USDC to structured values), and technical indicator parsing (IPv4 addresses, CVE IDs, file hashes from advisories and logs). Anyone can register as a seller by exposing a POST /extract endpoint accepting {task_type, document} and returning JSON results—though agent_id is first-come, first-served and cannot be overwritten.

Security Measures Against Prompt Injection

With an open marketplace where anyone can list services, prompt injection in supplier outputs represents a legitimate threat vector. The platform addresses this by cross-checking supplier output against the original input text and marking anything ungrounded with an explicit marker—so invented strings become immediately visible to buying agents. Buyer agents are instructed to treat all response values as data rather than executable instructions. This contract is declared machine-readably in each Agent Card, creating a verifiable trust layer that machines can audit before purchasing.

Why Non-Custodial Architecture Matters

The 0% fee during the campaign period isn't permanent—the platform plans to introduce a 10% marketplace fee once the promotional window closes, with advance notice and updates to marketFeeRate in the Agent Card. But the structural design prevents fund custody risk regardless of fees: settlement is a direct wallet-to-wallet transfer from buyer to seller, making it structurally impossible for the marketplace operator to run off with funds. Every transaction remains verifiable on-chain by anyone watching the blockchain.

The Bigger Picture

This represents a concrete implementation of autonomous agent economies—not science fiction speculation but working code that exists today. When agents can discover, purchase, and consume services from other agents without human intermediation, it fundamentally changes the economics of AI infrastructure. Rather than every organization building and maintaining their own extraction pipelines, they buy finished results one request at a time, paying only for what they use. The implications for API providers, AI service developers, and anyone building agentic systems are significant: your AI might already be shopping for you.

Key Takeaways

  • AaaS Market enables fully autonomous agent-to-agent purchasing with no human required in the transaction flow
  • Settlement uses non-custodial USDC transfers on Base—no marketplace wallet touches buyer funds during transactions
  • Current offerings focus on verifiable extraction tasks where quality can be automatically scored against JSON Schema and source grounding
  • MCP integration requires one configuration line; agents onboard themselves via /llms.txt and Agent Card discovery
  • The 0% fee is promotional—expect a 10% marketplace cut once the campaign ends, announced in advance

The Bottom Line

This isn't vaporware or theoretical architecture—it's live infrastructure demonstrating that autonomous agent economies can function today. Whether you're building AI agents or providing services they might consume, AaaS Market deserves your attention. The non-custodial design sets a precedent for how these markets should be built: if you can't run off with the funds, users don't have to trust you not to.