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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 1 of 158.

L0 observations over catalog endpoints
EndpointNetworkDeclared methodCatalogL0Last probedCalls 30d
x402.twit.sh/tweets/searcheip155:8453GETactiveunverified2026-08-14 08:52 UTC73,091
agents.chain.link/v1/operations/:workflowNameeip155:8453POSTactiveunverified2026-08-14 08:53 UTC36,209
x402.tavily.com/searcheip155:8453POSTactiveunverified2026-08-14 08:52 UTC29,944
stableenrich.dev/api/exa/searcheip155:8453POSTactiveunverified2026-08-14 08:52 UTC16,945
agents.chain.link/v1/operations/:operationId/submiteip155:8453POSTactiveunverified2026-08-14 08:53 UTC15,998
stabletravel.dev/api/seats-aero/searcheip155:8453GETactiveunverified2026-08-14 08:52 UTC6,254
api.exa.ai/searcheip155:8453POSTactivepass2026-08-14 08:52 UTC3,660
api.deepnets.ai/api/token-safetysolana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdpGETactiveunverified2026-08-14 08:52 UTC3,211
x402engine.app/api/crypto/priceeip155:8453GETactiveunverified—2,746
stableenrich.dev/api/exa/contentseip155:8453POSTactiveunverified2026-08-14 08:52 UTC2,690
api.loyalspark.online/x402-gateway/recipient-api/offerseip155:8453GETactiveunverified2026-08-14 08:52 UTC2,575
blockrun.ai/api/v1/exa/searcheip155:8453POSTactiveunverified2026-08-14 08:52 UTC2,544
api.deepnets.ai/api/token-safety/:solana_addresssolana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdpGETactiveunverified2026-08-14 08:53 UTC2,272
stableenrich.dev/api/firecrawl/searcheip155:8453POSTactiveunverified2026-08-14 08:52 UTC2,137
stableenrich.dev/api/pdl/people-enricheip155:8453POSTactiveunverified2026-08-14 08:52 UTC1,905
x402.ottoai.services/tweet-searcheip155:8453GETactiveunverified2026-08-14 08:52 UTC1,723
api.deepnets.ai/api/token/:solana_address/statssolana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdpGETactiveunverified2026-08-14 08:53 UTC1,719
api.deepnets.ai/api/watchlistsolana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdpGETactiveunverified2026-08-14 08:52 UTC1,683
token4u.ai/v1/chat/completionseip155:8453POSTactiveunverified2026-08-14 08:53 UTC1,613
api.nansen.ai/api/v1/profiler/address/current-balanceeip155:8453POSTactivepass2026-08-14 08:52 UTC1,280
x402.agentutility.ai/users-by-usernameeip155:8453POSTactiveunverified2026-08-14 08:53 UTC1,272
kronossignals.com/api/v1/liquidations/btceip155:8453GETactivepass2026-08-14 08:52 UTC1,181
stable-people-data-git-pdl-signoz-usage-alarms-merit-syst…eip155:8453POSTactiveunverified—1,141
x402.browserbase.com/browser/session/createbasePOSTactiveunverified2026-08-14 08:52 UTC1,102
api.onesource.io/api/chain/block-numbereip155:8453GETactiveunverified2026-08-14 08:52 UTC1,096
stableenrich.dev/api/fullenrich/people-searcheip155:8453POSTactiveunverified2026-08-14 08:52 UTC1,088
api.deepnets.ai/api/flagged-tokenssolana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdpGETactiveunverified2026-08-14 08:53 UTC912
api.loyalspark.online/x402-gateway/recipient-api/balanceeip155:8453GETactiveunverified2026-08-14 08:52 UTC912
google-trends.use.x402atlas.com/trendeip155:8453GETactivepass2026-08-14 08:52 UTC901
x402.ottoai.services/crypto-newseip155:8453GETactiveunverified2026-08-14 08:52 UTC864
stabletravel.dev/api/google-flights/searcheip155:8453GETactiveunverified2026-08-14 08:52 UTC862
api.deepnets.ai/api/wallet-details/:solana_addresssolana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdpGETactiveunverified2026-08-14 08:53 UTC855
api.deepnets.ai/api/token-safety-history/:solana_addresssolana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdpGETactiveunverified2026-08-14 08:53 UTC844
api.deepnets.ai/api/token/:solana_address/holder-graphsolana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdpGETactiveunverified2026-08-14 08:53 UTC837
api.onesource.io/api/chain/erc20-balanceeip155:8453GETactiveunverified2026-08-14 08:52 UTC819
api.onesource.io/api/chain/ens/:inputeip155:8453GETactiveunverified2026-08-14 08:52 UTC815
stabletravel.dev/api/seats-aero/availabilityeip155:8453GETactiveunverified2026-08-14 08:52 UTC763
api.loyalspark.online/x402-gateway/recipient-api/voucherseip155:8453GETactiveunverified2026-08-14 08:52 UTC743
api.onesource.io/api/chain/live-balanceeip155:8453GETactiveunverified2026-08-14 08:52 UTC743
api.loyalspark.online/x402-gateway/recipient-api/workflow…eip155:8453GETactiveunverified2026-08-14 08:52 UTC736
api.loyalspark.online/x402-gateway/recipient-api/rewardseip155:8453GETactiveunverified2026-08-14 08:52 UTC734
api.onesource.io/api/chain/tx/:hasheip155:8453GETactiveunverified2026-08-14 08:52 UTC718
x402-stock-indicators.vercel.app/analyst/:tickereip155:8453GETactiveunverified2026-08-14 08:53 UTC710
api.loyalspark.online/x402-gateway/recipient-api/balanceseip155:8453GETactiveunverified2026-08-14 08:52 UTC696
api.loyalspark.online/x402-gateway/recipient-api/prepare-…eip155:8453POSTactiveunverified2026-08-14 08:52 UTC692
google-trends.use.x402atlas.com/related-querieseip155:8453GETactivepass2026-08-14 08:52 UTC689
2s.io/api/stocks/insider-sentimenteip155:8453GETactiveunverified—679
blockrun.ai/api/v1/exa/contentseip155:8453POSTactiveunverified2026-08-14 08:52 UTC675
api.onesource.io/api/chain/nonce/:addresseip155:8453GETactiveunverified2026-08-14 08:52 UTC589
blockrun.ai/api/v1/exa/answereip155:8453POSTactiveunverified2026-08-14 08:52 UTC588
api.onesource.io/api/chain/block/:numbereip155:8453GETactiveunverified2026-08-14 08:52 UTC585
api.onesource.io/api/chain/erc20-transferseip155:8453GETactiveunverified2026-08-14 08:52 UTC574
api.onesource.io/api/chain/contract/:addresseip155:8453GETactiveunverified2026-08-14 08:52 UTC570
api.onesource.io/api/chain/total-supplyeip155:8453GETactiveunverified2026-08-14 08:52 UTC565
api.onesource.io/api/chain/nft-metadataeip155:8453GETactiveunverified2026-08-14 08:52 UTC560
api.onesource.io/api/chain/erc721-tokenseip155:8453GETactiveunverified2026-08-14 08:52 UTC552
www.x402scan.com/api/x402/merchantseip155:8453GETactiveunverified2026-08-14 08:52 UTC547
api.onesource.io/api/chain/receipt/:hasheip155:8453GETactiveunverified2026-08-14 08:52 UTC543
api.loyalspark.online/x402-gateway/recipient-api/cancel-o…eip155:8453POSTactiveunverified2026-08-14 08:52 UTC534
api.loyalspark.online/x402-gateway/recipient-api/redeem-r…eip155:8453POSTactiveunverified2026-08-14 08:52 UTC522
2s.io/api/calendar/earningseip155:8453GETactiveunverified—518
api.loyalspark.online/x402-gateway/recipient-api/workflow…eip155:8453POSTactiveunverified2026-08-14 08:52 UTC518
api.onesource.io/api/chain/network-infoeip155:8453GETactiveunverified2026-08-14 08:52 UTC509
api.loyalspark.online/x402-gateway/recipient-api/accept-o…eip155:8453POSTactiveunverified2026-08-14 08:52 UTC495
stableenrich.dev/api/reddit/searcheip155:8453POSTactiveunverified2026-08-14 08:52 UTC464
base-gas-x402-production.up.railway.app/gaseip155:8453GETactiveunverified2026-08-14 08:53 UTC462
api.deepnets.ai/api/tibane-staking/:solana_addresssolana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdpGETactiveunverified2026-08-14 08:53 UTC450
api.onesource.io/api/chain/chain-ideip155:8453GETactiveunverified2026-08-14 08:52 UTC448
api.deepnets.ai/api/holder-analysis/:solana_addresssolana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdpGETactiveunverified2026-08-14 08:53 UTC444
api.deepnets.ai/api/token-details/:solana_addresssolana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdpGETactiveunverified2026-08-14 08:53 UTC439
readx.sh/api/tweets/:id/replieseip155:8453GETactiveunverified2026-08-14 08:52 UTC425
api.deepnets.ai/api/streamflow-locks/:solana_addresssolana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdpGETactiveunverified2026-08-14 08:53 UTC414
api.strale.io/x402/email-validatebaseGETactiveunverified—414
blockrun.ai/api/v1/pm/polymarket/marketseip155:8453GETactiveunverified2026-08-14 08:52 UTC406
2s.io/api/geocode/addresseip155:8453GETactivepass2026-08-14 08:52 UTC405
2s.io/api/search/aieip155:8453GETactiveunverified—400
redlynr.com/runeip155:8453POSTactiveunverified2026-08-14 08:53 UTC389
api.deepnets.ai/api/network-details/:solana_addresssolana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdpGETactiveunverified2026-08-14 08:53 UTC388
api.onesource.io/api/chain/nft-ownereip155:8453GETactiveunverified2026-08-14 08:52 UTC387
x402.ochinimus.app/api/liquidation-statssolana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdpGETactiveunverified2026-08-14 08:53 UTC379
api.exa.ai/contentseip155:8453POSTactiveunverified2026-08-14 08:52 UTC378
api.onesource.io/api/chain/eventseip155:8453GETactiveunverified2026-08-14 08:52 UTC374
tick.hugen.tokyo/tick/latesteip155:8453GETactiveunverified2026-08-14 08:52 UTC373
api.onesource.io/api/chain/calleip155:8453POSTactiveunverified2026-08-14 08:52 UTC372
api.onesource.io/api/chain/estimate-gaseip155:8453POSTactiveunverified2026-08-14 08:52 UTC367
win.oneshotagent.com/v1/tools/searcheip155:8453POSTactiveunverified2026-08-14 08:53 UTC367
api.onesource.io/api/chain/code/:addresseip155:8453GETactiveunverified2026-08-14 08:52 UTC363
api.onesource.io/api/chain/erc1155-balanceeip155:8453GETactiveunverified2026-08-14 08:52 UTC359
stableupload.dev/api/uploadeip155:8453POSTactiveunverified2026-08-14 08:52 UTC359
x402.ottoai.services/kol-sentimenteip155:8453GETactiveunverified2026-08-14 08:52 UTC358
win.oneshotagent.com/v1/tools/enrich/profileeip155:8453POSTactiveunverified2026-08-14 08:53 UTC354
x402-api.aubr.ai/api/chat/encryptedeip155:8453POSTactivepass2026-08-14 08:53 UTC354
api.onesource.io/api/chain/allowanceeip155:8453GETactiveunverified2026-08-14 08:52 UTC351
coinflip402.vercel.app/api/coinflipeip155:8453GETactiveunverified2026-08-14 08:52 UTC351
stableenrich.dev/api/clado/contacts-enricheip155:8453POSTactiveunverified2026-08-14 08:52 UTC351
readx.sh/api/:name/infoeip155:8453GETactiveunverified2026-08-14 08:53 UTC334
crypto.apitoll.cloud/v1/crypto/priceeip155:8453GETactiveunverified2026-08-14 08:52 UTC330
vaaya.ai/api/run/exa/searcheip155:8453POSTactiveunverified2026-08-14 08:52 UTC329
riddlex402.vercel.app/api/riddleeip155:8453GETactiveunverified2026-08-14 08:52 UTC323
memegeneratorx402.vercel.app/api/generate-memeeip155:8453GETactiveunverified2026-08-14 08:52 UTC319

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.