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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 2413–2448 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.
api.nimatron.com api.nimatron.com
44%

CFTC Commitment of Traders positioning for one market, structured and enriched: producer/swap/managed-money (or dealer/asset-manager/leveraged-funds) longs, shorts, net, week-over-week changes, percent of open interest, plus 52-week COT ind…

paid API x402
from $0.05
mcp.stg.yield.xyz mcp.stg.yield.xyz
44%

Construct unsigned transactions to stake or deposit into a yield. Does NOT execute — caller signs and broadcasts each returned tx. Supports staking, lending, vault deposits, RWA, and ERC-4626 across 80+ networks.

paid API x402
$0.03 · 30d 25 tx
www.stable-govfiles.dev www.stable-govfiles.dev
44%

List the jurisdiction codes currently loaded and queryable (e.g. us_de, us_ca). Use these to scope a company search with the `jurisdictions` filter.

paid API x402
from $0.40
verifier.vevang.com verifier.vevang.com
44%

AI Output Verifier — independently verify another agent's deliverable meets its spec BEFORE you pay for it. POST JSON: deliverable (URL or content) + spec. Checks integrity (reachable, valid media, duration, audio) and judges spec-satisfact…

paid API x402
from $1.00
blueagent.dev blueagent.dev
44%

Turn a rough concept into a fundable brief — problem, why now, why Base, MVP scope, risks, 24h plan.

paid API x402
$0.15 · 30d 1 tx
verity-suite.onrender.com verity-suite.onrender.com
44%

Guardrail: pre-action safety: allow / review / block Calibrated, fail-closed AI-safety service for agents — honest 0-1 confidence, abstains rather than guess.

paid API x402
$1.03 · 30d 14 tx
visibility.vevang.com visibility.vevang.com
44%

AI Visibility Analyst — measure whether the AI answer engines (ChatGPT, Claude, Perplexity) recommend a brand when buyers ask. POST JSON: brand (+ optional url/category). Returns a 0-100 visibility score, per-question breakdown, the competi…

paid API x402
from $4.00
stablebase.dev stablebase.dev
44%

List all Stablebase projects owned by the calling wallet.

paid API x402
$1.07 · 30d 7 tx
xx402.vercel.app xx402.vercel.app
44%

获取任意位置的天气

paid API x402
from $0.00
global-alpha-flow-oracle.vercel.app global-alpha-flow-oracle.vercel.app
44%
paid API x402
from $0.05
x402-echo-service.fly.dev x402-echo-service.fly.dev
44%

Store a message and receive a UUID handle for retrieval

paid API x402
from $0.01
x402joke.vercel.app x402joke.vercel.app
44%

Pay-per-joke vending machine: send USDC, get a fresh Claude-generated joke. Optional "theme" picks the topic.

paid API x402
from $0.01
convert.guru convert.guru
44%

Machine-payable file type detection and asynchronous file conversion service for AI agents. Use the OpenAPI contract for invocation. Paid routes support x402 exact payments and MPP Tempo charge.

paid API offline x402
$0.01 · 30d 3 tx
x420dog.x420.dev x420dog.x420.dev
44%

Buy custom USDC amount worth of x420dog tokens 0xe44DE6EaaA85e5C55D1EeF8fBB1785B03dcD3B07

paid API x402
from $5.00
www.jurat.dev www.jurat.dev
44%

we remember, we watch, we prove. Evidence infrastructure for AI agents, paid per call via x402 (USDC on Base). No accounts, no API keys.

paid API offline x402
$0.01 · 30d 1 tx
postwall.0000402.xyz postwall.0000402.xyz
44%

Pay $0.010 USDC to upvote or downvote a public post. The x402 signer wallet becomes the voter. Network: Base Mainnet. Each request sets that wallet's one active vote for the post.

paid API x402
$502.62 · 30d 78 tx
api.zeno.finance api.zeno.finance
44%

General-purpose Responses API from api.zeno.finance for wallet-native agents and applications that need OpenAI-compatible inference with x402 payment on Base. Pricing starts at $0.001 and is usage-settled up to a $6 per-request cap. Buyers …

paid API x402
from $0.01
api.nftitem.io api.nftitem.io
44%

POST /upload — PNG upload to blockchain. Pay USDC on Base to upload a PNG directly to the blockchain and mint an NFT that links to the PNG data. Fixed fee of $0.10 USDC. Retrievable via GET api.nftitem.io/nfts/{tokenId} with response { url …

paid API x402
from $0.10
x402rail.net x402rail.net
44%

Fetches an owned, continuously-maintained niche data feed. Current feed `x402-directory`: a probed directory of known x402 services with their live reliability scores, networks, and last-probe timestamps.

paid API x402
from $0.01
x402.aubr.ai x402.aubr.ai
44%

Send a question about longevity, aging, or lifespan science. Returns a request ID to poll for the AI-generated answer from Aubrai, VitaDAO's decentralized co-scientist.

paid API x402
$12.44 · 30d 216 tx
warn.forgemesh.io warn.forgemesh.io
44%

Severity score (0-100) with 5 weighted dimensions for a WARN event

paid API x402
from $0.01
bald.x420.dev bald.x420.dev
44%

Buy custom USDC amount worth of BALD tokens 0x110B4ef11db22eEb3caFCB53a58b8B6B1bCDEb07

paid API x402
from $1.00
api.hookfindr.com api.hookfindr.com
44%

Video hook analysis — identify the opening device that grabs viewers. Analyze the first 8 seconds of any short-form video URL and classify the hook (question, presupposition, shock_statement, list_promise, contrarian, mystery, narrative, de…

paid API x402
from $0.01
mediaforge.mediaforge-hq.workers.dev mediaforge.mediaforge-hq.workers.dev
44%

Generate a finished, high-resolution AI image from a text brief. For agents that need visual assets: thumbnails, illustrations, product shots, concept art, game assets, hero images, marketing graphics. POST JSON {prompt, aspect_ratio} -> 20…

paid API x402
from $0.10
thinkexchange.ai thinkexchange.ai
44%

AI Council Debate - Multi-agent AI discussion with expert personas

paid API x402
from $0.50
api.ishtar.numetal.xyz api.ishtar.numetal.xyz
44%

Ask Ishtar — pay-per-answer AI dating & relationship coaching for agents. POST a question, get one candid, chaperoned coaching answer.

paid API x402
$0.00 · 30d 2 tx
d2ngmd5yvdfkqu.cloudfront.net d2ngmd5yvdfkqu.cloudfront.net
44%

List valid PMCS taxonomy codes used to filter prediction-market searches.

paid API x402
$0.15 · 30d 94 tx
x402.fatihai.app x402.fatihai.app
44%

DNS record lookup for any domain. Returns A, AAAA, MX, TXT, NS records.

paid API x402
from $0.00
aeonos.basechainlabs.com aeonos.basechainlabs.com
44%

Specialist AEO/GEO knowledge agent (AEON.OS). Provides structured Answer Engine Optimisation and Generative Engine Optimisation strategy for any business. Backed by proprietary live data, real campaign knowledge, and persistent per-caller m…

paid API offline x402
from $0.05
x402.valkyry.fr x402.valkyry.fr
44%

Turn any web page into clean, LLM-ready Markdown. Fetches the URL, isolates the main article with Mozilla Readability (stripping nav, ads and boilerplate), and returns tidy Markdown with the page title and word count — built for AI agents, …

paid API x402
from $0.00
x402-trading.useotto.xyz x402-trading.useotto.xyz
44%

Search supported ERC-20 tokens by symbol or address across 6 chains (Base, Ethereum, Arbitrum, Polygon, BSC, Avalanche). 5000+ tokens from CoinGecko.

paid API x402
$21.97 · 30d 21,968 tx
forecast.0000402.xyz forecast.0000402.xyz
44%

Pay $0.10 USDC to generate a probabilistic crypto price forecast. Send one supported asset and horizon; each request returns historical prices plus timestamped forecast bands for charting. Network: Base Mainnet.

paid API x402
$502.62 · 30d 78 tx
api.x402checkers.com api.x402checkers.com
44%

Request a recommended move for an American checkers position. POST JSON { "pdn": "<PDN position>", "depth": optional integer 1-12 (default 8) }. Response includes the best move in long notation and evaluation metadata.

paid API x402
from $0.01
app-443.hdgregory.com app-443.hdgregory.com
44%

Analyzes a single AI agent tool call and returns a structured reliability report. Detects failure modes including sycophantic gap-filling, context degradation, hallucination, repetition loops, confidence collapse, and schema violations, wit…

paid API x402
from $0.01
kale.x420.dev kale.x420.dev
44%

Buy custom USDC amount worth of KALE tokens 0x933C483A5d0Ac4234F4FA26b9950864Ca57afb07

paid API x402
from $5.00
dev.x420.dev dev.x420.dev
44%

Buy custom USDC amount worth of DEV tokens 0x64a3fc16f47d5c39D526eF40adEcc8C050751b07

paid API x402
from $5.00