Skip to content

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 473 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 181–216 of 473
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.
Wikipedia article summary for any topic wikipedia.hergertsynthora.com
q 88

Wikipedia article summary for any topic: title, extract, thumbnail, canonical URL. Instant knowledge lookup for agents. Deterministic, no key. $0.01 USDC via x402 on Base. First 3 calls FREE per wallet — send header X-WALLET: 0x<addr>. No c…

paid API data x402
Real-time peg deviation for USDT/USDC/DAI/FRAX and more vs $1.00, with depeg risk flag. Pr stablecoin-peg.hergertsynthora.com
q 88

Real-time peg deviation for USDT/USDC/DAI/FRAX and more vs $1.00, with depeg risk flag. Pre-trade safety for treasury and payment agents. Free source. $0.01 USDC via x402 on Base. SYNTHORA. First 3 calls FREE per wallet — send header X-WALL…

paid API data x402
Live order book depth and liquidity (bid/ask walls, spread, imbalance) for any crypto pair orderbook-liquidity.hergertsynthora.com
q 88

Live order book depth and liquidity (bid/ask walls, spread, imbalance) for any crypto pair. For execution and slippage-aware agents. Free source. $0.01 USDC via x402 on Base. SYNTHORA. First 3 calls FREE per wallet — send header X-WALLET: 0…

paid API data x402
Real-time trending coins by search interest and momentum, with rank and price change. Disc crypto-trending.hergertsynthora.com
q 88

Real-time trending coins by search interest and momentum, with rank and price change. Discovery signal for narrative/momentum agents. Free source. $0.005 USDC via x402 on Base. SYNTHORA. First 3 calls FREE per wallet — send header X-WALLET:…

paid API data x402
Real-time circulating supply and chain breakdown for all major stablecoins via DefiLlama. stablecoin-mcap.hergertsynthora.com
q 88

Real-time circulating supply and chain breakdown for all major stablecoins via DefiLlama. Systemic-risk signal for treasury agents. Free source. $0.01 USDC via x402 on Base. SYNTHORA. First 3 calls FREE per wallet — send header X-WALLET: 0x…

paid API data x402
scrape402 x402.shizu.me
q 86

Pay-per-call HTTP utility APIs for AI agents: web scraping and extraction, crypto market data (spot/candles/orderbook/gas), FX rates, weather (current+historical), RSS, and data utilities. Paid via x402 USDC micropayments on Base — no signu…

paid API data x402
$0.97 · 30d 178 tx
fetcher.sh fetcher.sh
q 86

HTTP web-data API. Search or fetch public data from Twitter/X (x.com), YouTube, TikTok, Instagram, Reddit, Google Search, Google Maps, Google News, Google Play (Play Store), the Apple App Store (iOS apps), or Yelp. Pay per call in USDC (x40…

paid API data x402
$8.98 · 30d 719 tx
Search prediction markets ACROSS PLATFORMS (Polymarket + Kalshi) in one call polymarket-markets.hergertsynthora.com
q 85

Search prediction markets ACROSS PLATFORMS (Polymarket + Kalshi) in one call: live prices, implied probability, volume, liquidity, end date and market conviction. Server-side search that actually finds the market (bitcoin, fed, election, ge…

paid API data x402
$3.02 · 30d 127 tx
chelsea-hermes fachada.chelsea-hermes.workers.dev
q 85

Callable services for agents and humans: a rule-based code security scan (Python/JS, exact line numbers), travel-request parsing for agencies and BTC/ETH market data (daily candles and derivatives). Deterministic, no LLM in the path, so the…

paid API live data x402
$18.93 · 30d 15 tx
Wolfram Alpha wolframalpha.x402.paysponge.com
q 85

Query Wolfram|Alpha for computational knowledge, short answers, simple image results, and full structured query output for math, science, finance, units, dates, geography, and fact-based problem solving.

paid API data x402
$4.82 · 30d 271 tx
AxonGate web-production-8136ee.up.railway.app
q 85

AxonGate is an x402-paid Clean Context Broker on Base. It converts public web pages into clean Markdown for RAG, autonomous research, and LLM context preparation.

paid API data x402
from $0.03
websearch websearch--gw.swerver.net
q 85

Obscura headless browser through a custom Rust API. ~100ms results. $0.01

paid API data x402
$0.07 · 30d 30 tx
MadeOnSol madeonsol.com
q 85

MadeOnSol delivers real-time Solana memecoin intelligence via x402 micropayments — pay per request in USDC on Solana, no API keys or subscriptions. Endpoints cover a live KOL wallet trade feed (1,000+ tracked wallets), KOL convergence/c…

paid API data x402
$0.05 · 30d 11 tx
CryptoPulse Data API cryptopulse.saascloud.ai
q 85

Pay-per-call crypto market intelligence for AI agents on Base mainnet (x402 v2, USDC). Spot prices, trending coins, Fear & Greed index, gas prices, OHLC candles, DEX pair liquidity/volume, ERC-20 rug-pull/honeypot risk checks, and top DeFi …

paid API data x402
$0.00 · 30d 2 tx
AgentFeed x402.ochinimus.app
q 85

Real-time crypto and sports trading data for AI agents, paid per call in USDC via x402 on Solana and Base. No API keys, no accounts, no subscriptions. Records every liquidation across ~600 USDT perpetuals on Bybit, OKX and Binance — includi…

paid API data x402
$21.01 · 30d 56 tx
DeFi Signals API defi-signals.org
q 85

Paid market-data API for AI agents (x402, USDC on Base): cross-venue perpetual funding rates (OKX, Kraken Futures, dYdX) with a ready-to-use arbitrage spread signal, outlier-cleaned DeFi yields from DefiLlama, and a low-cost BTC/ETH/SOL mar…

paid API data x402
$0.13 · 30d 43 tx
Hugen Weather API weather.hugen.tokyo
q 85

Pay-per-call weather API: given a city name or coordinates it returns current conditions and daily forecasts up to 7 days as structured JSON, with x402 payment in USDC on Base or Solana.

paid API data x402
$6.85 · 30d 889 tx
DripMetrics AI api.dripmetrics.ai
q 85

Pay-per-call API returning crypto market microstructure and risk metrics as JSON (VPIN, Kyle lambda, Roll spread, CVD, Amihud illiquidity, gamma exposure), paid per request in USDC on Base with no API key. Standard metrics $0.05, market sum…

paid API data x402
$7.21 · 30d 108 tx
cn402 api.cn402.com
q 85

Pay-per-call API for Chinese calendar and culture data: lunar and solar calendar, jieqi, BaZi astrology, I Ching, feng shui, hanzi to pinyin and simplified/traditional conversion, TCM references and China geo lookups. Priced from $0.002 to …

paid API data x402
$79.57 · 30d 4,219 tx
Domain Intelligence API domain.hugen.tokyo
q 85

Domain intelligence lookups: WHOIS, multi-resolver DNS, SSL/TLS certificate, technology stack, security headers, subdomain discovery and redirect chain. Each check is available on its own, or combined into a single full report. Paid per cal…

paid API data x402
$6.85 · 30d 889 tx
x402watch api.x402.printmoneylab.com
q 85

Analytics API for the x402 ecosystem. Returns an 8-label classification with confidence for a buyer wallet, plus on-demand wash trading checks for any wallet or seller address.

paid API data x402
$0.91 · 30d 326 tx
Agent Utility Shop api.ikoles.dev
q 85

Paid x402 APIs and downloadable toolkits for autonomous agents, procurement, engineering data, structured-data QA, clinical research and sourced analysis.

paid API data x402
$0.01 · 30d 1 tx
AfriRef - Pan-African government reference data afriref.dev
q 85

Verified government reference data for 34 African countries: central-bank policy rates, VAT, minimum wages, CPI inflation, corporate and personal income tax, and public holidays. Every value is cited to the official gazette, central bank or…

paid API data x402
$6.23 · 30d 119 tx
Melchior Video Context transcript.melchiorlabs.com
q 85

Pay-per-request YouTube transcripts, cited evidence search, and context chunks for autonomous agents. Structured JSON, timestamp citations, Base and Solana USDC via x402, no API key.

paid API data x402
$0.02 · 30d 6 tx
DeFi Signal API wazir-x402.duckdns.org
q 85

Real-time DeFi intelligence from live 24/7 bot infrastructure. Morpho Blue borrower positions, Aave near-liquidation data, PoolTogether draw timing. Pay-per-call in USDC on Base via x402.

paid API data x402
$0.05 · 30d 1,284 tx
Semagram semagram.io
q 85

Semantic search over Telegram — 1M+ channels, groups and bots. Agents query GET /api/agent/search and pay per request in USDC on Base or Solana via x402; price scales with result count ($0.01 per 100 results).

paid API data x402
from $0.01
Circadian circadian-agent.com
q 85

Pay-per-call web data APIs run by a disclosed autonomous AI agent business. extract turns any public URL into clean Markdown plus metadata for $0.01; meta returns OpenGraph, JSON-LD, feeds and canonical data as one JSON for $0.005; brief or…

paid API data x402
$1.01 · 30d 2 tx
chainfeed chainfeed.leeworks.dev
q 85

Composable crypto/DeFi data for agents: gas, Hyperliquid funding+OI, DeFi yields, prices, Polymarket odds in one paid call, plus deterministic derived facts (liquidation price, net funding cost, net APY). x402 v2 exact on Base, settles via …

paid API data x402
from $0.01
Azimuth azimuth.day
q 85

Radio-frequency positioning DePIN for AI agents: pay-per-call location APIs (estimate a position from cellular observations) plus receiver-node registration and status. USDC on Solana and Base, x402 v2, with machine-readable discovery at /.…

paid API data x402
from $0.0010
Recompete Radar recompete.melchiorlabs.com
q 85

Pay-per-call federal contract award expiration evidence for research agents, sourced from official USAspending records with source links and deterministic receipts.

paid API data x402
$0.02 · 30d 6 tx
Package Evidence packages.melchiorlabs.com
q 85

Deterministic npm registry evidence for coding agents: dependency maps, integrity, provenance, factual metadata flags, and stable digests over x402.

paid API data x402
$0.02 · 30d 6 tx
asiaref asiaref.dev
q 85

Verified government reference data for 28 Asian countries: central-bank policy rates, VAT/GST, minimum wages, CPI inflation, corporate and personal income tax, and public holidays. Every value is cited to the official gazette, central bank …

paid API data x402
$6.23 · 30d 119 tx
Zinin M2M Hub api.timzinin.com
q 85

98 pay-per-call data APIs behind x402 on Base. Company registry lookups and enrichment, sanctions and litigation screening, real-estate and job listings across 15 countries, SEC/EDGAR and funding trackers, crypto wallet and token analytics,…

paid API data x402
from $0.02
Devryno devryno.com
q 85

Tiny paid web services for agents. Current commerce wedge: compare merchant feed price/currency/availability with public product-page signals, audit Product/Offer JSON-LD/OpenGraph/microdata/visible text, and generate repair drafts.

paid API data x402
$0.03 · 30d 18 tx
Premium Rewards data GETs api.premiumrewards.vip
q 85

Six x402 GETs on Base USDC. Spot FX $0.01: one ECB reference conversion (informational only, not for transaction use; same rates free at https://www.ecb.europa.eu; not sold or endorsed by the ECB). One Sense $0.02: first Wiktionary sense (C…

paid API data x402
$0.03 · 30d 11 tx
Fetchgate fetchgate.dev
q 85

Agent-builder digital-goods storefront and web-reader API on Cloudflare Workers. GET /v1/products returns a catalog (x402 reference kits, MCP/x402 registries, prompt-injection test corpus and defenses, an eval harness), GET /v1/buy/:id is a…

paid API data x402
from $0.0010