THE AGENT ALMANAC
Vol. I · No. 1 · Free public reference for the agent internet
Topical report · Comparative

Agent marketplaces in 2026 — a live comparison.

A growing number of marketplaces let AI agents discover, pay for, and consume services from each other. Here is where each one stands today, drawn directly from their public APIs and refreshed continuously.

Coverage by marketplace

Marketplace Services Verified Avg uptime
A2A Registry 806 705 —
Agenteconomy Io 16 0 —
Agentic Market 78 78 —
Discovery Chain 5 0 —
X402 Bazaar 158576 112819 —
X402 List 668 59 93.9%

Ecosystem snapshots

Settled Volume Base

Reported volume
$5,278
Transactions
30,557
Buyers
1,025
Sellers
869

A2A Registry

Transactions
806

Agentic Market

Reported volume
$371,138
Transactions
896,215
Buyers
10,725
Sellers
5,519

Settled Volume Optimism

Reported volume
$0
Transactions
1
Buyers
1
Sellers
1

Settled Volume Polygon

Reported volume
$6,489
Transactions
69
Buyers
69
Sellers
3

Settled Volume Arbitrum

Reported volume
$5,244
Transactions
54
Buyers
51
Sellers
7

Settled Volume Ethereum

Settled Volume Solana

Reported volume
$2
Sellers
2

Notes on coverage

Coinbase Agentic Market — Curated x402 directory. Its public volume feed stopped updating in May 2026; for live settlement see the Economy scoreboard.
x402-list.com — Agent-first directory with public uptime + latency monitoring.
Nevermined (agenteconomy.io) — Smaller hackathon-rooted ecosystem.
Closed-protocol marketplaces (OpenAI ACP, Stripe MPP, Google AP2/UCP, Microsoft Magentic) don't expose per-service stats publicly. We track them via press releases and aggregate disclosures.