Lint your x402 listing before agents skip it.
25 read-only checks against your live origin — the 402 handshake, your agent docs, your directory standing — return an A–F grade with per-check evidence and a one-line fix for each finding. SSL Labs, for x402 sellers.
x402lint report
api.example.dev
19
4
2
sample report · your grade varies
// FEATURED
Featured origins
A hand-picked selection of graded x402 origins. Branding is auto-collected and unverified.
Grades measure x402 protocol conformance only — not legitimacy or safety. A well-built scam can score an A. Always do your own diligence before paying any service.
Relaystation — Pay-per-call storage and trust for agents and developers.
api.relaystation.ai
Protocol 96·Docs 79·Standing 98
Baton is pay-per-call storage, handoff, and cryptographic proof on Relaystation. An agent signs one USDC payment and gets a result — no acc…
Space Data API
agentdataapi.onrender.com
Protocol 100·Docs 74·Standing 98
Pay-per-request space data for AI agents, powered by x402.
CURB
api.curb.numetal.xyz
Protocol 96·Docs 93·Standing 98
CURB — agent-to-agent inference swap rail. Settlement is single-payee x402 USDC on Base (eip155:8453): buyer pays gross ONCE to an on-chain…
gitbeacon
api.gitbeacon.dev
Protocol 100·Docs 100·Standing 98
gitBeacon — GitHub trend intelligence for AI agents. A daily scan of trending new GitHub repos, LLM-analyzed into a structured digest (titl…
Hyperliquid Prediction Markets
hyperliquid-predict.use.x402atlas.com
Protocol 96·Docs 84·Standing 98
rh-chain-intel - Robinhood Chain data for AI agents
rh-chain-intel.vercel.app
Protocol 100·Docs 78·Standing 98
On-chain data for Robinhood Chain (Ethereum L2 on Arbitrum, mainnet since July 2026) for AI agents: network health, wallet snapshots and ac…
Clanker Banker
clanker-banker.agentfetcher.workers.dev
Protocol 100·Docs 77·Standing 98
Free GET /v1/resolve (classify + decode third-party 402s). Paid POST /v1/llm-pack (page→LLM markdown, x402 USDC Base).
InboxPolicy
api.inboxpolicy.com
Protocol 96·Docs 77·Standing 98
Send-decision email verification API. One call returns an action — send, send_with_caution, review, retry_later, or avoid — with confidence…
whatchuneed — Everything Your AI Agent Needs
whatchuneed.vercel.app
Protocol 100·Docs 78·Standing 98
320+ pay-per-call API endpoints across accommodation, LLM, code execution, crypto, medical, finance, and more. One API, one payment. Powere…
vindex
api.vindexapi.dev
Protocol 90·Docs 100·Standing 98
Vehicle Intelligence for AI agents. Pay per call with x402 (USDC on Base) to decode any 17-char VIN with its original factory new-vehicle w…
minia2a
minia2a.uk
Protocol 96·Docs 89·Standing 98
Agent-to-agent API marketplace: 1,600+ pay-per-call x402 microservices for AI agents — crypto data, web scraping, AI inference, token secur…
AgentIAM
achillesalpha.com
Protocol 100·Docs 89·Standing 98
Identity, safety & execution proofs for autonomous agents. 18 x402 endpoints on Base Mainnet — risk scoring, integrity checks, memory verif…
Groundcheck Engine
groundcheck.seiche.info
Protocol 100·Docs 91·Standing 98
The grounding check agents run before they commit to an answer.
Robinhood Launch Intelligence
robinhood-launches.hustlerhigher.workers.dev
Protocol 96·Docs 83·Standing 98
Bankr-only feed of newest permissionless Robinhood Chain token launches with creator attribution, contracts, market cap, volume, transactio…
Second Eyes
secondeyesai.com
Protocol 100·Docs 85·Standing 98
Open payment and verification substrate for autonomous agents. Multi-rail (x402 USDC/Base, AP2 VDC mandates, Stripe ACP), ERC-8004 identity…
K2 Agent Services
k2-agent-services.vercel.app
Protocol 100·Docs 83·Standing 98
Autonomous agent services payable per call in USDC via x402 v2 (Circle Gateway, multi-chain): Chinese-English translation, deep web researc…
Verity Suite
suite.veritylayer.dev
Protocol 100·Docs 74·Standing 98
The trust fabric for AI agents — calibrated, fail-closed services agents pay per call.
SYS84 — Onchain Agent Intelligence
api.sys84.org
Protocol 96·Docs 80·Standing 98
SYS84 provides receipt-backed wallet and onchain risk services across Base, Robinhood Chain, and Ink via x402.
x402-solana
x402-solana-cva8.onrender.com
Protocol 100·Docs 74·Standing 98
Paid x402 API tools for AI agents, settled in USDC on Solana. Crypto pre-trade safety (Solana SPL rug/honeypot checks, EVM+Solana token saf…
ArgonautWorks Public Web Page Reader
web-page-reader.vercel.app
Protocol 100·Docs 75·Standing 98
A bounded, robots-aware reader for public static web pages that returns sanitized Markdown. It never executes JavaScript or bypasses authen…
Macaroon Network
api.macaroonnetwork.com
Protocol 100·Docs 85·Standing 98
Marketplace for agent-purchasable capabilities. Every listing carries a falsifiable acceptance predicate; payment settles only when the pre…
Powerful multichain search by Blockscout
api.blockscout.com
Protocol 96·Docs 78·Standing 98
Explore crypto activities with Blockscout's multichain search. Find transactions, addresses, tokens, and dapps across top blockchain networ…
AxonOS GPU Compute (x402)
app.axonos.io
Protocol 96·Docs 84·Standing 98
On-demand GPU Linux compute sessions with SSH access, rented by the minute and paid in USDC on Base via x402.
conch402
conch402.dylan-caponi.workers.dev
Protocol 100·Docs 74·Standing 98
The Magic Conch, as an API. Pull the string ($0.05), receive one of the seven answers the conch actually says in the SpongeBob SquarePants…
HALOWERK identwerk
ident.halowerk.com
Protocol 90·Docs 85·Standing 99
HALOWERK identwerk. Bezahlung über x402 in USDC auf Base Mainnet.
HALOWERK handelswerk
handel.halowerk.com
Protocol 90·Docs 85·Standing 99
HALOWERK handelswerk. Bezahlung über x402 in USDC auf Base Mainnet.
HALOWERK nostrwerk
nostr.halowerk.com
Protocol 90·Docs 85·Standing 99
HALOWERK nostrwerk. Bezahlung über x402 in USDC auf Base Mainnet.
HALOWERK finanzwerk
finanz.halowerk.com
Protocol 90·Docs 85·Standing 99
HALOWERK finanzwerk. Bezahlung über x402 in USDC auf Base Mainnet.
X402 Swarm Protocol - A2A Commerce Suite
swarm-protocol.onrender.com
Protocol 96·Docs 84·Standing 98
Authentic, high-value Agent-to-Agent (A2A) commerce primitives and security infrastructure for autonomous AI agents.
HALOWERK researchwerk
research.halowerk.com
Protocol 90·Docs 85·Standing 99
HALOWERK researchwerk. Bezahlung über x402 in USDC auf Base Mainnet.
HALOWERK rechtwerk
recht.halowerk.com
Protocol 90·Docs 85·Standing 99
HALOWERK rechtwerk. Bezahlung über x402 in USDC auf Base Mainnet.
HALOWERK audiowerk
audio.halowerk.com
Protocol 90·Docs 85·Standing 99
HALOWERK audiowerk. Bezahlung über x402 in USDC auf Base Mainnet.
HALOWERK sicherwerk
sicher.halowerk.com
Protocol 90·Docs 85·Standing 99
HALOWERK sicherwerk. Bezahlung über x402 in USDC auf Base Mainnet.
Losbeto
api.losbeto.xyz
Protocol 96·Docs 100·Standing 99
x402-paid market data + OpenAI-compatible LLM gateway for AI agents, global in scope: forex, equities, commodities, crypto and macro — incl…
HALOWERK defiwerk
defi.netzhandwerker.de
Protocol 90·Docs 85·Standing 99
HALOWERK defiwerk. Bezahlung über x402 in USDC auf Base Mainnet.
HALOWERK modellwerk
modell.halowerk.com
Protocol 90·Docs 85·Standing 99
HALOWERK modellwerk. Bezahlung über x402 in USDC auf Base Mainnet.
HALOWERK medwerk
med.halowerk.com
Protocol 90·Docs 85·Standing 99
HALOWERK medwerk. Bezahlung über x402 in USDC auf Base Mainnet.
HALOWERK buerowerk
buero.halowerk.com
Protocol 100·Docs 79·Standing 99
HALOWERK buerowerk. Bezahlung über x402 in USDC auf Base Mainnet.
HALOWERK kettenwerk
kette.netzhandwerker.de
Protocol 90·Docs 85·Standing 99
HALOWERK kettenwerk. Bezahlung über x402 in USDC auf Base Mainnet.
HALOWERK x402werk
x402.netzhandwerker.de
Protocol 90·Docs 85·Standing 99
HALOWERK x402werk. Bezahlung über x402 in USDC auf Base Mainnet.
HALOWERK naturwerk
natur.halowerk.com
Protocol 90·Docs 85·Standing 99
HALOWERK naturwerk. Bezahlung über x402 in USDC auf Base Mainnet.
HALOWERK statwerk
stat.halowerk.com
Protocol 90·Docs 85·Standing 99
HALOWERK statwerk. Bezahlung über x402 in USDC auf Base Mainnet.
HALOWERK netzwerk
netz.halowerk.com
Protocol 90·Docs 85·Standing 99
HALOWERK netzwerk. Bezahlung über x402 in USDC auf Base Mainnet.
HALOWERK paketwerk
paket.halowerk.com
Protocol 90·Docs 85·Standing 99
HALOWERK paketwerk. Bezahlung über x402 in USDC auf Base Mainnet.
HALOWERK medienwerk
medien.halowerk.com
Protocol 96·Docs 79·Standing 99
HALOWERK medienwerk. Bezahlung über x402 in USDC auf Base Mainnet.
HALOWERK agentenwerk
agent.halowerk.com
Protocol 90·Docs 85·Standing 99
HALOWERK agentenwerk. Bezahlung über x402 in USDC auf Base Mainnet.
HALOWERK kartenwerk
karte.halowerk.com
Protocol 90·Docs 85·Standing 99
HALOWERK kartenwerk. Bezahlung über x402 in USDC auf Base Mainnet.
Syntalic: Agentic intelligence for CPG founders
api.syntalic.com
Protocol 96·Docs 82·Standing 98
Synthia, from Syntalic, analyzes e-comm prices, promos, and competitors, plus social attention and creators, so CPG founders can own their…
// THE MARKET TRUTH
Most x402 listings are silently broken. Agents just move on.
~2,900
x402 origins registered
~127
made a sale last month
the rest
silently broken or invisible
There is no error message when an agent skips you — it just picks the next origin that answers the handshake cleanly. x402lint finds the exact reasons, before your buyers do:
// 25 CHECKS · v2026-07-25.1
What we check
Every check is read-only and versioned. We fetch your live surfaces — never send a real payment (the only payment-ish probe is a literal garbage header) — and grade three categories.
Protocol & payment surface
8 checks402 challenge validity, accepts[] schema, price integrity, HEAD-does-not-settle, and payment-header correctness.
Discovery & agent docs
12 checksOpenAPI x402 conventions, security schemes, Bazaar extensions, .well-known surfaces, llms.txt, agent-card, robots, and favicon.
Ecosystem standing
5 checksRegistration/freshness on x402scan, recent on-chain settlement, trust tier, and x402.org presence.
25 checks across 3 categories — the full per-check findings and fixes are free to read in the cached report; pay only to force an always-fresh re-scan.
// DIRECTORY
Previously scanned
The recently-scanned archive of graded origins (5157 total). Branding is auto-collected and unverified.
Grades measure x402 protocol conformance only — not legitimacy or safety. A well-built scam can score an A. Always do your own diligence before paying any service.
afriref
afriref.dev
Protocol 80·Docs 70·Standing 98
Pan-African government reference data for AI agents: central-bank policy rates, VAT, minimum wages, CPI inflation, corporate and personal i…
Relaystation — Pay-per-call storage and trust for agents and developers.
api.relaystation.ai
Protocol 96·Docs 79·Standing 98
Baton is pay-per-call storage, handoff, and cryptographic proof on Relaystation. An agent signs one USDC payment and gets a result — no acc…
JARVIS API — pay-per-request AI endpoints
desktop-suts94d.tail0b188d.ts.net
Protocol 26·Docs 77·Standing 98
defi-ops-402
defi-ops-402.vercel.app
Protocol 100·Docs 63·Standing 98
Live cross-verified Arbitrum stablecoin yield data, ready-to-sign deposit calldata, and CoW Protocol gasless order building. Paid per call…
predict-node.com API v1
predict-node.com
Protocol 26·Docs 77·Standing 98
Autonomous AI Agent Financial Prediction Node powered by local GPU inference.
Solana Intelligence API — rug check, sniper feeds, memecoin alpha
x402api.ivanskolic-creator.deno.net
Protocol 26·Docs 74·Standing 98
On-chain Solana intelligence for AI trading agents: memecoin rug check (honeypot, mint/freeze authority, sell-tax), insider/bundle detectio…
Space Data API
agentdataapi.onrender.com
Protocol 100·Docs 74·Standing 98
Pay-per-request space data for AI agents, powered by x402.
Per-call whale and large-transfer alerts for any token or wallet on Base, keyless. Returns
whale-alert.hergertsynthora.com
Protocol 26·Docs 74·Standing 98
Per-call whale and large-transfer alerts for any token or wallet on Base, keyless. Returns the biggest recent ERC-20 transfers plus a WHALE…
CURB
api.curb.numetal.xyz
Protocol 96·Docs 93·Standing 98
CURB — agent-to-agent inference swap rail. Settlement is single-payee x402 USDC on Base (eip155:8453): buyer pays gross ONCE to an on-chain…
Real-time composite crypto market-stress score (0-100) for autonomous agents. Synthesizes
market-risk.hergertsynthora.com
Protocol 26·Docs 74·Standing 98
Real-time composite crypto market-stress score (0-100) for autonomous agents. Synthesizes fear & greed, BTC dominance and perpetual funding…
Crypto Snapshot Pro x402 Agent
crypto-snapshot-pro.onrender.com
Protocol 100·Docs 67·Standing 98
gitbeacon
api.gitbeacon.dev
Protocol 100·Docs 100·Standing 98
gitBeacon — GitHub trend intelligence for AI agents. A daily scan of trending new GitHub repos, LLM-analyzed into a structured digest (titl…
Crypto Perp Funding & Sentiment
perpsignals.use.x402atlas.com
Protocol 86·Docs 84·Standing 98
 for AI agents: network health, wallet snapshots and ac…
Clanker Banker
clanker-banker.agentfetcher.workers.dev
Protocol 100·Docs 77·Standing 98
Free GET /v1/resolve (classify + decode third-party 402s). Paid POST /v1/llm-pack (page→LLM markdown, x402 USDC Base).
Twitter/X Tweet Media Downloader
xmedia.use.x402atlas.com
Protocol 86·Docs 84·Standing 98
 execut…
MEV Exposure Detector
mevdetector.hergertsynthora.com
Protocol 26·Docs 74·Standing 98
MEV Exposure Detector: detects sandwich attacks, frontrunning, and backrunning on DEX swaps by scanning block-adjacent transactions. Signal…
ClawForge Network - x402 Workers
clawforgeagents.xyz
Protocol 26·Docs 77·Standing 98
Red de micro-servicios autónomos con pago por uso via x402 (USDC en Base). Extracción JSON, investigación, contenido, visión, PDFs, búsqued…
Agent Capability Attestation
agentattest.hergertsynthora.com
Protocol 26·Docs 74·Standing 98
Agent Capability Attestation: SYNTHORA multi-LLM jury evaluates an autonomous agent's declared capabilities against real sample outputs. Re…
Octav API
api.octav.fi
Protocol 90·Docs 74·Standing 98
Octav portfolio and wallet analytics API with x402 payment support
SYNTHORA FX Exchange Rates Oracle
exchange-rates.hergertsynthora.com
Protocol 26·Docs 77·Standing 98
Real-time foreign exchange rates for 170+ currencies. Financial agents need FX before cross-border transactions.
// PRICING
Grades are free. Fresh scans cost cents.
Look up any grade and read the full cached report for free. Force an always-fresh scan for a few cents in USDC over x402 — plus a machine tier for agents: bulk directory export and a change feed. No signup and no API keys.
Status lookup
FREE
no payment ever
Grade, score, and pass/warn/fail counts for any prior scan. The cold-email payload.
Cached full report
FREE
no payment ever
The complete per-check findings and fixes for any recently-scanned origin (<24h cache).
Change feed
$0.03
per call · USDC via x402
Machine tier: directory changes since a cursor — new, grade_changed, and rescanned events.
Fresh conformance scan
main$0.05
per call · USDC via x402
Force an always-fresh run of every check against your origin, bypassing the cache — A–F grade with per-check evidence and fixes.
Directory export
$0.10
per call · USDC via x402
Machine tier: the full graded directory as one dump, with grade history per origin.
// FOR AGENTS
Everything is machine-readable
Agents: start at llms.txt on the API host. No docs portal, no sandbox keys, no signup — the challenge tells you the price and where to pay. There is a machine tier too: a bulk directory export and a change feed for agents that track the graded directory.