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vet402
Independent MeasurementRegister: x402 endpoint observations (L0)Catalog snapshot: 2026-08-15 (15,073 of 15,073 fetched)
vet402MethodologyNo purchases attached · facts only

The x402 Observatory

Abstract

Every endpoint in the public x402 discovery catalog, observed daily: is it still listed, and does its payment wall answer a valid 402 challenge when approached with the method it declares. No purchase is ever attached; the challenge itself is the observable. pass / fail / unverified are defined measurements, not opinions — definitions here. unverified is not a failure: it means the catalog entry does not declare enough for a machine to check.

1.Observed endpoints

15,753 endpoints on record, ordered by observed call volume (catalog-reported, last 30 days). Page 5 of 158.

L0 observations over catalog endpoints
EndpointNetworkDeclared methodCatalogL0Last probedCalls 30d
api.x402node.dev/aviation/airport-departureseip155:8453GETactiveunverified—58
atq6wtkp6k.execute-api.us-east-1.amazonaws.com/prod/v1/pa…eip155:8453POSTactiveunverified—58
ozmium.org/v1/risk/pairseip155:8453GETactiveunverified2026-08-14 08:53 UTC58
pro-api.coinmarketcap.com/x402/v1/dex/searcheip155:8453GETactivepass2026-08-14 08:52 UTC58
stableenrich.dev/api/google-maps/nearby-search/fulleip155:8453POSTactiveunverified2026-08-14 08:53 UTC58
aeml-x402.zeabur.app/gauge/rulereip155:8453GETactiveunverified—57
api.nansen.ai/api/v1/tgm/flow-intelligenceeip155:8453POSTactiveunverified—57
x402.orthogonal.com/baseten/v1/chat/completionseip155:8453POSTactiveunverified—57
api.linkedpanda.com/agent/v1/profiles/:linkedinIdeip155:8453POSTactiveunverified—56
api.x402node.dev/aviation/airport-arrivalseip155:8453GETactiveunverified—56
api.x402node.dev/aviation/flighteip155:8453GETactiveunverified—56
macropulse.theaslangroupllc.com/api/fx/converteip155:8453GETactiveunverified2026-08-14 08:53 UTC56
x402.ottoai.services/twitter-summaryeip155:8453GETactiveunverified2026-08-14 08:52 UTC56
aeml-x402.zeabur.app/mcp/censuseip155:8453GETactiveunverified—55
deepseek.x402.press/v1/chat/completionseip155:8453POSTactiveunverified2026-08-14 08:52 UTC55
x402.ottoai.services/equity-newseip155:8453GETactiveunverified2026-08-14 08:53 UTC55
api.nansen.ai/api/v1/profiler/address/transactionseip155:8453POSTactiveunverified2026-08-14 08:52 UTC54
api.strale.io/x402/solutions/lead-email-verifybasePOSTactiveunverified—54
glim.sh/api/v1/twitter/users/:ref/tweetssolana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdpPOSTactiveunverified2026-08-14 08:52 UTC54
ozmium.org/v1/loan/fixedeip155:8453GETactiveunverified2026-08-14 08:53 UTC54
tools.bip-rep.com/dnseip155:8453GETactiveunverified2026-08-14 08:52 UTC54
x402.glassnode.com/v1/metrics/indicators/nvteip155:8453GETactiveunverified2026-08-14 08:53 UTC54
x402.ottoai.services/trending-altcoinseip155:8453GETactiveunverified2026-08-14 08:52 UTC54
2s.io/api/gov/fda-food-recallseip155:8453GETactiveunverified—53
blockrun.ai/api/v1/pm/polymarket/eventseip155:8453GETactiveunverified2026-08-14 08:52 UTC53
coingecko.use.x402atlas.com/marketseip155:8453GETactivepass2026-08-14 08:52 UTC53
glim.sh/api/v1/web/fetchsolana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdpPOSTactiveunverified2026-08-14 08:52 UTC53
ozmium.org/v1/earn/vaultseip155:8453GETactiveunverified2026-08-14 08:53 UTC53
crypto.apitoll.cloud/v1/crypto/sentimenteip155:8453GETactiveunverified2026-08-14 08:52 UTC52
website2vat.com/x402/vat-lookupeip155:8453POSTactiveunverified2026-08-14 08:53 UTC52
x402.glassnode.com/v1/metrics/indicators/net_realized_pro…eip155:8453GETactiveunverified2026-08-14 08:53 UTC52
agent402.tools/api/randomeip155:8453GETactiveunverified2026-08-14 08:52 UTC51
blockrun.ai/api/v1/modal/sandbox/createeip155:8453POSTactiveunverified2026-08-14 08:52 UTC51
blockrun.ai/api/v1/pm/kalshi/marketseip155:8453GETactiveunverified2026-08-14 08:52 UTC51
x402.ottoai.services/market-riskeip155:8453GETactiveunverified2026-08-14 08:52 UTC51
x402.ottoai.services/news-recapseip155:8453GETactiveunverified2026-08-14 08:53 UTC51
agentpay.tools/tools/pre_trade_check/calleip155:8453POSTactiveunverified2026-08-14 08:52 UTC50
ozmium.org/v1/tx/swapeip155:8453POSTactiveunverified2026-08-14 08:53 UTC50
stableestate.dev/api/sales/searcheip155:8453POSTactiveunverified—50
stableupload.dev/api/siteeip155:8453POSTactiveunverified2026-08-14 08:52 UTC50
voice.forgemesh.io/v1/tts/baseeip155:8453POSTactiveunverified2026-08-14 08:53 UTC50
x402.openwebninja.com/website-contacts-scraper/scrape-con…eip155:8453GETactiveunverified—50
x402.twit.sh/users/by/ideip155:8453GETdelistedunverified—50
api.agentstools.dev/enrich/domaineip155:8453GETactiveunverified—49
glim.sh/api/v1/web/searchsolana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdpPOSTactiveunverified2026-08-14 08:52 UTC49
api.strale.io/x402/startup-domain-checkbaseGETactiveunverified—48
sandbox.node4all.com/v1/x402-testeip155:84532GETactiveunverified2026-08-14 08:52 UTC48
skim402.com/api/v2/readeip155:8453GETactiveunverified2026-08-14 08:52 UTC48
x402.agentutility.ai/recent-tweet-searcheip155:8453POSTactiveunverified2026-08-14 08:53 UTC48
aeml-x402.zeabur.app/gauge/regioneip155:8453GETactiveunverified—47
glim.sh/api/v1/twitter/tweets/searchsolana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdpPOSTactiveunverified2026-08-14 08:52 UTC47
schemasure.com/v2/extract-imageeip155:8453POSTactiveunverified2026-08-14 08:53 UTC47
agent402.tools/api/address-profileeip155:8453POSTactiveunverified2026-08-14 08:53 UTC46
x402-market.kore-app.workers.dev/v1/marketeip155:8453GETactiveunverified2026-08-14 08:53 UTC46
aeml-x402.zeabur.app/gauge/aireip155:8453GETactiveunverified—45
aeml-x402.zeabur.app/trust/graveyardeip155:8453GETactiveunverified—45
agent402.tools/api/ttseip155:8453POSTactiveunverified2026-08-14 08:53 UTC45
api.blockscout.com/:chain_id/api/v2/addresses/:address_ha…eip155:8453GETactiveunverified—45
x402stock.xyz/api/v1/treasury-yieldseip155:8453GETactiveunverified2026-08-14 08:53 UTC45
aeml-x402.zeabur.app/gauge/agri-regioneip155:8453GETactiveunverified—44
aeml-x402.zeabur.app/trust/scorecardeip155:8453GETactiveunverified—44
api.nansen.ai/api/v1/prediction-market/event-screenereip155:8453POSTactiveunverified2026-08-14 08:53 UTC44
stablepeopledata.dev/api/pdl/company/enricheip155:8453POSTactiveunverified2026-08-14 08:53 UTC44
www.capminal.ai/api/x402/researcheip155:8453GETactiveunverified2026-08-14 08:53 UTC44
x402-coin-api.vercel.app/api/pricebase-sepoliaGETactiveunverified—44
action402.vercel.app/api/execute/webhookeip155:8453POSTactiveunverified2026-08-14 08:53 UTC43
aeml-x402.zeabur.app/gauge/historyeip155:8453GETactiveunverified—43
aeml-x402.zeabur.app/gauge/shipping-regioneip155:8453GETactiveunverified—43
aeml-x402.zeabur.app/stable/coineip155:8453GETactiveunverified—43
blockrun.ai/api/v1/exa/find-similareip155:8453POSTactiveunverified2026-08-14 08:53 UTC43
longwatch.dev/watches/:id/alertseip155:8453GETactiveunverified—43
ozmium.org/v1/ideaseip155:8453GETactiveunverified2026-08-14 08:53 UTC43
schemasure.com/v2/extracteip155:8453POSTactiveunverified2026-08-14 08:53 UTC43
www.tereno.xyz/api/v1/capabilities/token.metadata/invokeeip155:8453GETactiveunverified2026-08-14 08:53 UTC43
x402.ottoai.services/pools-searcheip155:8453GETactiveunverified2026-08-14 08:53 UTC43
x402.ottoai.services/web-extracteip155:8453GETactiveunverified2026-08-14 08:52 UTC43
x402.shizu.me/bountyeip155:8453GETactiveunverified—43
x402engine.app/api/travel/hotelseip155:8453GETactiveunverified—43
aeml-x402.zeabur.app/gauge/grid-regioneip155:8453GETactiveunverified—42
aeml-x402.zeabur.app/resolveeip155:8453GETactiveunverified—42
api.demandex.dev/v1/opportunities/trendingeip155:8453GETactivepass2026-08-14 08:53 UTC42
api.interzoid.com/getfullnamematcheip155:8453GETactivepass2026-08-14 08:53 UTC42
blockrun.ai/api/v1/pm/polymarket/leaderboardeip155:8453GETactiveunverified2026-08-14 08:52 UTC42
ozmium.org/v1/positions/:addresseip155:8453GETactiveunverified2026-08-14 08:53 UTC42
palmyr.ai/phone/numbers/:id/callsolana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdpPOSTactivepass2026-08-14 08:53 UTC42
readx.sh/api/:name/followers_webeip155:8453GETactiveunverified—42
aeml-x402.zeabur.app/gauge/aicompute-regioneip155:8453GETactiveunverified—41
aeml-x402.zeabur.app/gauge/censuseip155:8453GETactiveunverified—41
aeml-x402.zeabur.app/gauge/drug-detail-regioneip155:8453GETactiveunverified—41
aeml-x402.zeabur.app/gauge/filing-companyeip155:8453GETactiveunverified—41
aeml-x402.zeabur.app/gauge/policy-regioneip155:8453GETactiveunverified—41
aeml-x402.zeabur.app/gauge/stablecoin-regioneip155:8453GETactiveunverified—41
aeml-x402.zeabur.app/resolve/proposereip155:8453GETactiveunverified—41
aeml-x402.zeabur.app/stablecoin-deathseip155:8453GETactiveunverified—41
api.linkedpanda.com/agent/v1/jobs/searcheip155:8453POSTactiveunverified—41
api.osf-master-server.com/x402/identity/entity/:queryeip155:8453GETactiveunverified2026-08-14 08:53 UTC41
x402.shizu.me/credits/buyeip155:8453POSTactiveunverified—41
aeml-x402.zeabur.app/gauge/calibratedeip155:8453GETactiveunverified—40
aeml-x402.zeabur.app/gauge/carbon-regioneip155:8453GETactiveunverified—40
aeml-x402.zeabur.app/gauge/depin-regioneip155:8453GETactiveunverified—40

2.Reading this table

Catalog is presence in the public discovery catalog: active means listed as of the latest snapshot; delisted means the entry was present on an earlier day and absent on a complete fetch — with the before/after recorded on the endpoint's page. L0 is the payment-wall measurement: pass — a probe using the declared method received HTTP 402 with a parseable accepts array consistent with the catalog declaration; fail — two or more consecutive probes contradicted that (each with a recorded reason); unverified — not enough declared to measure, or the evidence threshold is not yet met. A day on which our own fetch was incomplete produces no delisting judgements at all.