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 6 Data 470 AI 226 Verification 141 Finance 114 Blockchain 84 Other 51 Content 44 Compute 20 Web 14 Search 13 Inference 9

sort Quality Revenue (30d) Recently updated Name

Showing 1–6 of 6

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

Melis Notify notify.melis.ai

q 80

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

paid API social x402

from $0.0050

StablePhone stablephone.dev