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 Data 351 AI 136 Finance 87 Verification 67 Blockchain 58 Other 26 Content 22 Search 14 Web 12 Compute 12 Infrastructure 10 Inference 9
sort Quality Revenue (30d) Recently updated Name
Showing 1–6 of 6
Why this order?
Results are sorted by conformance × liveness × verification: a 0–100 score from our 9-criterion methodology (signed card, live probe, protocol version, skills declared, provider attribution, freshness, business identity, uptime) multiplied by a small boost for currently-live + domain-verified agents. Machine-readable schema: conformance.json. No paid placement, no editorial weights.
StableEmail stableemail.dev
100%

Send/receive email + custom domains + inboxes

paid API social x402
$12.13 · 30d 310 tx
PostalForm postalform.com
80%

Print and mail real letters via AI agents

paid API live social x402
Melis Notify notify.melis.ai
80%

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

paid API social x402
from $0.0050
StablePhone stablephone.dev
60%

AI phone calls + dedicated numbers

paid API social x402
$67.55 · 30d 126 tx
agentfax agentfax.val.run
35%

Send a fax to any phone number, priced per page. Pay-per-fax for AI agents — no signup, no API key; documents are never stored.

paid API social mpp
AgentMail api.agentmail.to
30%

Send and receive email as an AI agent

paid API social x402