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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 335 AI 127 Finance 85 Verification 60 Blockchain 57 Other 22 Content 18 Search 14 Web 12 Compute 12 Infrastructure 10 Inference 9
sort Quality Revenue (30d) Recently updated Name
Showing 1945–1980 of 3,505
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.
domain-age-checker.underscoredone.com domain-age-checker.underscoredone.com
65%

Send a list of domain names and this tool tells you exactly how old each one is, when it was first registered, when it expires, and how much time is left before expiration. Great for spotting brand-new suspicious domains, researching compet…

paid API x402
$30.68 · 30d 57 tx
entropy.rip entropy.rip
65%

Fetch live gas price estimations and base fees for EVM chains

paid API x402
from $0.01
gateway.stride20k.com gateway.stride20k.com
65%

Current x402 ecosystem composition: services per category (Agentic.Market taxonomy: Data, Inference, Search, Infra, Media, Social, Trading, Travel...), each with catalog share and 7-day delta, from our collector's latest observation run (~3…

paid API x402
$0.41 · 30d 20 tx
jmt-x402-proxy.jmthomasofficial.workers.dev jmt-x402-proxy.jmthomasofficial.workers.dev
65%

Raw RDAP registration record for a domain, returned as structured JSON.

paid API x402
$0.02 · 30d 3 tx
keyronne.com keyronne.com
65%

Resolve DNS records over DNS-over-HTTPS: A, AAAA, MX, TXT, NS, CNAME, SOA, CAA, SRV, PTR and more. Returns parsed answers with TTLs and the response status. Built for agents checking mail routing, domain config, or propagation. POST a JSON …

paid API x402
$0.04 · 30d 15 tx
stablestudio.io stablestudio.io
65%

Get a client token for direct upload to Vercel Blob

paid API x402
$135.31 · 30d 567 tx
port-scanner.underscoredone.com port-scanner.underscoredone.com
65%

Give this API a hostname or IP address and it will try connecting to each port in your requested range. For every port that answers, it tells you whether it is open or blocked, which service is likely running there (like a web server or SSH…

paid API x402
$30.68 · 30d 57 tx
api.robotsshop.io api.robotsshop.io
65%

Independent quality layer for x402 agent-payments: liveness, protocol correctness, spam, payTo integrity, longitudinal reliability.

paid API offline x402
$0.01 · 30d 2 tx
waterpulse.theaslangroupllc.com waterpulse.theaslangroupllc.com
65%

Global water intelligence API. Covers US groundwater levels (USGS 10,000+ monitoring wells), streamflow at gauge stations, drought status (US Drought Monitor D0-D4), water quality (EPA WQP — nitrates, lead, arsenic, PFAS, bacteria), aquifer…

paid API offline x402
$357.10 · 30d 1,118 tx
toolsmith-api.dassad10.workers.dev toolsmith-api.dassad10.workers.dev
65%

Current gas price and latest block for Base or Ethereum mainnet, straight from public RPC. Fresh within 15 seconds. JSON response. $0.002 USDC per call, pay via x402, no API key.

paid API x402
$0.01 · 30d 4 tx
dns-whois-lookup.underscoredone.com dns-whois-lookup.underscoredone.com
65%

Send up to 10 domain names and get back every DNS record type (A, AAAA, MX, CNAME, TXT, NS, PTR, SOA, SRV, CAA, NAPTR, DS, TLSA) plus the full WHOIS registration profile (registrar, dates, contacts, status, nameservers) for each one. URLs a…

paid API x402
$30.68 · 30d 57 tx
qr-code-generator.underscoredone.com qr-code-generator.underscoredone.com
65%

Send a list of texts — website addresses, phone numbers, plain words, WiFi details, anything — and get back a ready-to-use QR code image for each one. Every QR code comes as a base64-encoded PNG you can drop straight into a webpage or save …

paid API x402
$30.68 · 30d 57 tx
api.svgsmith.dev api.svgsmith.dev
65%

Convert a raster image (PNG, JPEG, or WebP) into clean, editable, self-verified SVG vector art. Pay per conversion in USDC on Base via x402 - no API key, no subscription. Send JSON with imageBase64 or imageUrl; tune with mode (auto/binary/c…

paid API x402
$0.32 · 30d 16 tx
brasil-dados-api.onrender.com brasil-dados-api.onrender.com
65%

Full company dossier for a Brazilian CNPJ: legal name, registration status, shareholders/partners (QSA), main and secondary business activities (CNAE), share capital, address — plus an automatic sanctions screen against the CEIS debarment l…

paid API x402
$0.21 · 30d 37 tx
trader.rigoblock.com trader.rigoblock.com
65%

AI-powered DeFi trading agent for Rigoblock smart vaults. Natural language to safe swap/bridge calldata or delegated execution. Supports Uniswap, 0x, GMX perpetuals, Across bridging, Uniswap v4 LP, GRG staking, and pool deployment across 7 …

paid API x402
$0.07 · 30d 31 tx
sitemap-url-extractor.underscoredone.com sitemap-url-extractor.underscoredone.com
65%

Give this API a link to any website's sitemap.xml file and it will fetch and parse it, returning every URL found inside. If the sitemap links to other sitemaps (called sitemap indexes), it will follow and extract those too. Each URL is retu…

paid API x402
$30.68 · 30d 57 tx
x402-hono-api.inraby.workers.dev x402-hono-api.inraby.workers.dev
65%

Audit domain SSL/TLS certificate expiry, HTTPS reachability, HSTS, and HTTP-to-HTTPS redirect posture using certificate transparency and live transport checks.

paid API x402
$0.29 · 30d 7 tx
stablecoinpulse.theaslangroupllc.com stablecoinpulse.theaslangroupllc.com
65%

Real-time stablecoin market intelligence API. Synthesizes live data from DeFiLlama, CoinGecko, the Federal Register, and Tavily into structured, actionable intelligence covering GENIUS Act compliance, yield comparison, peg stability, cross-…

paid API offline x402
$357.10 · 30d 1,118 tx
clinicalintelpulse.theaslangroupllc.com clinicalintelpulse.theaslangroupllc.com
65%

Is my medication recalled? Checks the FDA enforcement databases (drug AND food — infant formula and supplements are filed under food) for active and past recalls, explains the recall class (I/II/III) in plain language, and lays out what to …

paid API offline x402
$357.10 · 30d 1,118 tx
onchainpulse.theaslangroupllc.com onchainpulse.theaslangroupllc.com
65%

Intelligence API for the onchain financial transition. Decodes legislation, tracks real world asset tokenization in depth (yield comparison, issuer/redemption risk, tokenized gold), models sector impact scenarios, guides onchain integration…

paid API offline x402
$357.10 · 30d 1,118 tx
api.vaults.fyi api.vaults.fyi
65%

Retrieves a filtered list of vaults with their basic information including address, network, associated asset details, and transactional support status.

paid API x402
$0.02 · 30d 12 tx
orcpin.dev orcpin.dev
65%

Trade-lot holding-period and realized-gain calculator for trading agents: per-lot days held, the exact date each lot's gain character turns long-term, and FIFO / specific-identification allocation of a proposed sell with realized gain per l…

paid API x402
$0.55 · 30d 25 tx
tools.miniframe.com.br tools.miniframe.com.br
65%

Use when someone needs to receive money in Brazil — an invoice, a split bill, a donation, a checkout. Builds a Pix BR Code ("Copia e Cola" string payable in any Brazilian bank app) plus a QR PNG, per the Central Bank spec; the key is not st…

paid API x402
$0.02 · 30d 1 tx
deepseek.x402.press deepseek.x402.press
65%

DeepSeek AI inference — pay in USDC/EURC on Base or USDC on Arbitrum

paid API x402
$5.89 · 30d 328 tx
space.bip-rep.com space.bip-rep.com
65%

Dedicated satellite tracking API for agents: list CelesTrak TLE catalog groups (ISS, weather, Starlink, and more) and predict the next visible pass over an observer latitude/longitude using NORAD catalog IDs. Outbound CelesTrak fetch only; …

paid API x402
$1.06 · 30d 48 tx
trabotpro.it trabotpro.it
65%

Hero SKU: Pearl Research L1 telemetry (pearld RPC, community nodes, poll history). Free trial: GET /api/a2a/pearl/status

paid API x402
$2.48 · 30d 7 tx
quokkapix.com quokkapix.com
65%

QuokkaPix official browser-agent batch/scenario unlock. Images stay local in the user's browser.

paid API x402
$0.02 · 30d 2 tx
hl-tool.darren-pi.workers.dev hl-tool.darren-pi.workers.dev
65%

Full Hyperliquid funding extremes (carry-cost leaderboard)

paid API x402
$0.01 · 30d 3 tx
x402-seller.onrender.com x402-seller.onrender.com
65%

Current average U.S. retail price of electricity, in cents per kilowatt-hour (cents/kWh) — e.g. "what's the electricity price right now". Reflects the latest monthly data (not real-time), averaged across all sectors combined (not sector-spe…

paid API x402
$5.34 · 30d 94 tx
cdp-agent-0-01.onrender.com cdp-agent-0-01.onrender.com
65%

AgentWire service card for webhook inbox relay and web fetch infrastructure.

paid API x402
$0.01 · 30d 5 tx
mcp.deep3.ai mcp.deep3.ai
65%

Short-term price-movement forecast for any crypto token across 7 time horizons.

paid API x402
$0.00 · 30d 2 tx
x402.jmthomasofficial.com x402.jmthomasofficial.com
65%

Company intelligence lookup: resolve a US-listed company ticker through the SEC EDGAR company ticker dataset. Returns CIK, ticker, and registrant name for company research, SEC filing discovery, and equity due diligence.

paid API x402
$0.02 · 30d 3 tx
omniterminal.app omniterminal.app
65%

Omni Terminal assesses one Hyperliquid market before entering, sizing, or reducing a position using all published mark-anchored liquidation levels, explicit flow direction, margin stress, current funding/carry, and enriched AI news.

paid API x402
from $0.00
preppers-paradise.com preppers-paradise.com
65%

Paid book chapter (x402): Automate the Boring Stuff with Python: What Is Programming. Unit of a larger practical-skills library; free catalog at /library/discovery.json. Book slug: automatetheboringstuffwithpythonnew. Response format: Markd…

paid API x402
$0.01 · 30d 1 tx
api.nativebtc.org api.nativebtc.org
65%

Pay once to receive a short-lived WebSocket ticket for the live Bitcoin mempool stream.

paid API x402
from $0.01
codepulse-api.hahavoid0.workers.dev codepulse-api.hahavoid0.workers.dev
65%

The premier developer tool suite built natively for AI agents. Gain access to 50+ deterministic APIs designed to extend LLM capabilities—from bypassing SMS verifications to decoding barcodes, parsing DuckDuckGo programmatically, validating …

paid API live x402
$0.38 · 30d 19 tx