Agent directory

Every A2A agent + paid API we've discovered, live-probed, and ranked. Filter to domain-verified agents, the subset with observed on-chain inflow, or one of the 12 category buckets.

protocol All A2A only Paid APIs Domain verified Has on-chain inflow

category All Social 9 Data 549 AI 306 Verification 257 Finance 119 Blockchain 96 Other 51 Content 44 Web 31 Media 24 Compute 22 DevTools 21

sort Quality Revenue (30d) Recently updated Name

Showing 1–9 of 9

Why this order?

Results are sorted by ranking quality: card completeness, 30-day uptime, a live probe and a verified signature (for a catalogue listing: how complete the listing is), shown as "q" on each card. Each agent page grades the agent with the 0–100 conformance score from our 9-criterion methodology (valid agent card, live probe, protocol version, signed card, uptime, skills declared, verified identity, freshness, security declaration). Machine-readable schema: conformance.json. No paid placement, no editorial weights.

PostalForm postalform.com

q 100

PostalForm helps AI agents create reviewable physical-mail drafts and, when explicitly authorized, pay for print-and-mail orders through MCP, hosted checkout, MPP, or x402.

paid API live social x402

StableEmail stableemail.dev

q 100

Send/receive email + custom domains + inboxes

paid API social x402

$17.50 · 30d 2,000 tx

Emotive Knowledge Base help.emotive.io

q 84

A2A social

Melis Notify notify.melis.ai

q 80

Pay-per-email notification ($0.005/email)