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 472 AI 226 Verification 141 Finance 115 Blockchain 84 Other 51 Content 44 Compute 20 Web 14 Search 13 Inference 9 Media 7
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