A2A earnings → wallet ranking, coverage and attribution

Explore the evidence index

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 549 AI 305 Verification 252 Finance 119 Blockchain 95 Other 51 Content 44 Web 30 Media 24 Compute 22 DevTools 21 Travel 19
sort Quality Revenue (30d) Recently updated Name
Showing 37–44 of 44
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.
musicwire.5432wire.com musicwire.5432wire.com

Pay-per-call MusicXML validation, MuseScore rendering, and automated QC for AI agents. Returns MP3 and MIDI; charges only after QC passes. Solo 0.25 USDC, ensemble 0.50 USDC on Base.

paid API content x402
from $0.10
library.proofivy.com library.proofivy.com

x402 micropayment APIs for publisher content. Agents pay USDC on Base to fetch CryptoSlate and The Phoblographer articles (POST with content_url) plus listing endpoints. Humans stay free on the publisher sites.

paid API content x402
$0.20 · 30d 20 tx
api.stacktr.ee api.stacktr.ee

Private HTML hosting for agents. POST HTML with a $0.50 x402 payment and get back a permanent, unguessable link. The paying wallet stays the update credential, so revisions are free: no account, no API key. $1 provisions a persistent API ke…

paid API content x402
$20.00 · 30d 38 tx
penny402.fun penny402.fun

The penny arcade of the x402 economy: ten tiny, self-contained attractions for agents at a flat $0.0025 in USDC (Base or Solana) — daily horoscope, oracle, koan, tarot, fortune, an x402-market prophecy, a wallet roast, and three live high-t…

paid API content x402
$0.08 · 30d 31 tx
xmedia.use.x402atlas.com xmedia.use.x402atlas.com

Resolves a public X (Twitter) post URL into direct CDN media links: mp4 video URLs with thumbnails plus every image in the post. Returns link URLs only, not the media bytes; posts with no media return 404. $0.005 per call in USDC on Base.

paid API content x402
$0.12 · 30d 24 tx
news.apitoll.cloud news.apitoll.cloud

Pay-per-call API returning Cointelegraph crypto news: latest feed or full-text search, with article body and view counts, across 14 locales. bash.001 USDC per call, on Base or Solana.

paid API content x402
$0.12 · 30d 120 tx
molty.cash api.molty.cash

Runs pay-per-view (CPM) content campaigns that pay creators in a Solana SPL or Base ERC-20 token, with views read from X or reported by the campaign owner's agent. Also exposes per-user endpoints for hiring individual creators. Payments set…

paid API content x402
from $1.00
The 402 Wall 404humans.xyz

A 1600×900 pixel billboard split into 14,400 blocks of 10×10 pixels, sold only over x402 for $1.00 USDC on Base — and only to machines. Humans may look. A purchase buys 100 pixels you control, a permanent public deed with your message and l…

paid API domain verified content x402
from $1.00