IPO Calendar
Professor Sausages
OtherLiveeip155:8453Exactvia cdp
IpoSecEdgarS-1424b4
Calls · 30d
1→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 4 snapshots so far.
$4.32
Verified settled volume
328 settlements proven x402 by their on-chain EIP-3009 marker.
$0.020
Listed price
As published in the catalog. Always read the live 402 before paying.
1
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-07-30 04:52Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x54ebFCF3870439B9db62381848c5DabC05c70d5BThe wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
Provider
The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.
Live 402 challenge
Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.
{
"error": "payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x54ebFCF3870439B9db62381848c5DabC05c70d5B",
"amount": "20000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 60
}
],
"resource": {
"url": "https://x402.professorsausages.com/ipo-calendar/expected",
"tags": [
"ipo",
"sec",
"edgar",
"s-1",
"424b4"
],
"mimeType": "application/json",
"description": "Imminent IPO listings inferred from SEC EFFECT notices and 8-A12B exchange registrations — strongest signals first",
"serviceName": "IPO Calendar"
},
"extensions": {
"help": {
"docs": "https://x402.professorsausages.com/ipo-calendar",
"sample": "https://x402.professorsausages.com/ipo-calendar/sample",
"example": "https://x402.professorsausages.com/ipo-calendar/expected",
"openapi": "https://x402.professorsausages.com/ipo-calendar/openapi.json"
},
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"limit": "How many results to return."
}
},
"output": {
"type": "object",
"required": [
"asOf",
"count",
"disclaimer",
"companies"
],
"properties": {
"asOf": {
"type": "string"
},
"count": {
"type": "integer"
},
"companies": {
"type": "array",
"items": {
"type": "object",
"required": [
"cik",
"name",
"stage",
"registrationForm",
"signals"
],
"properties": {
"cik": {
"type": "string",
"description": "Zero-padded 10-digit issuer CIK."
},
"sic": {
"type": [
"string",
"null"
]
},
"name": {
"type": "string"
},
"spac": {
"type": "boolean"
},
"edgar": {
"type": "string"
},
"stage": {
"enum": [
"registered",
"expected",
"dormant"
],
"type": "string"
},
"signals": {
"type": "object",
"properties": {
"form8A12BAt": {
"type": [
"string",
"null"
]
},
"effectNoticeAt": {
"type": [
"string",
"null"
]
}
}
},
"firstFiledAt": {
"type": [
"string",
"null"
]
},
"amendmentCount": {
"type": "integer"
},
"lastActivityAt": {
"type": [
"string",
"null"
]
},
"sicDescription": {
"type": [
"string",
"null"
]
},
"signalStrength": {
"enum": [
"strong",
"moderate",
"weak"
],
"type": "string"
},
"registrationForm": {
"enum": [
"S-1",
"F-1",
null
],
"type": [
"string",
"null"
]
},
"foreignPrivateIssuer": {
"type": "boolean",
"description": "True for F-1 filers."
}
}
}
},
"disclaimer": {
"type": "string"
}
}
}
},
"schema": {
"type": "object",
"required": [
"input"
],
"properties": {
"input": {
"type": "object"
},
"output": {
"type": "object"
}
}
},
"category": "finance",
"routeTemplate": "https://x402.professorsausages.com/ipo-calendar/expected"
},
"sample": {
"url": "https://x402.professorsausages.com/ipo-calendar/sample",
"hint": "A real cached response from this API (with its capture timestamp), free — judge the data quality before paying."
},
"catalog": {
"message": "This endpoint is 1 of 35 pay-per-call APIs for agents — all same x402 payment + auth. Browse the full menu free (no payment) at the catalog URL; every API serves a free real sample record at /<api>/sample.",
"strategy": "minimal",
"catalogUrl": "https://x402.professorsausages.com/?ref=402&v=minimal&from=ipo-calendar"
},
"suggest": {
"url": "https://x402.professorsausages.com/suggest",
"hint": "Missing data you'd pay for? POST {want, would_pay_usd} — free. The most-requested datasets get built first."
},
"discount": {
"off": "50%",
"hint": "Send X-Intent: <40+ chars describing what you're building and what data you need> for 50% off this call.",
"header": "X-Intent"
}
},
"x402Version": 2
}Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
0.02USDC≈ $0.02 USD
on Base · exact scheme
Pay 0.02 USDC on Base to 0x54eb…70d5B. The signed payment is good for 1 minute.
- Paid to
- 0x54eb…70d5B
- USD Coin contract
- 0x8335…02913
- Payment window
- 1 minute
- As published
- 20000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x54ebFCF3870439B9db62381848c5DabC05c70d5B",
"amount": "20000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 60
}
]Extensions
{
"help": {
"docs": "https://x402.professorsausages.com/ipo-calendar",
"sample": "https://x402.professorsausages.com/ipo-calendar/sample",
"example": "https://x402.professorsausages.com/ipo-calendar/expected",
"openapi": "https://x402.professorsausages.com/ipo-calendar/openapi.json"
},
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"limit": "How many results to return."
}
},
"output": {
"type": "object",
"required": [
"asOf",
"count",
"disclaimer",
"companies"
],
"properties": {
"asOf": {
"type": "string"
},
"count": {
"type": "integer"
},
"companies": {
"type": "array",
"items": {
"type": "object",
"required": [
"cik",
"name",
"stage",
"registrationForm",
"signals"
],
"properties": {
"cik": {
"type": "string",
"description": "Zero-padded 10-digit issuer CIK."
},
"sic": {
"type": [
"string",
"null"
]
},
"name": {
"type": "string"
},
"spac": {
"type": "boolean"
},
"edgar": {
"type": "string"
},
"stage": {
"enum": [
"registered",
"expected",
"dormant"
],
"type": "string"
},
"signals": {
"type": "object",
"properties": {
"form8A12BAt": {
"type": [
"string",
"null"
]
},
"effectNoticeAt": {
"type": [
"string",
"null"
]
}
}
},
"firstFiledAt": {
"type": [
"string",
"null"
]
},
"amendmentCount": {
"type": "integer"
},
"lastActivityAt": {
"type": [
"string",
"null"
]
},
"sicDescription": {
"type": [
"string",
"null"
]
},
"signalStrength": {
"enum": [
"strong",
"moderate",
"weak"
],
"type": "string"
},
"registrationForm": {
"enum": [
"S-1",
"F-1",
null
],
"type": [
"string",
"null"
]
},
"foreignPrivateIssuer": {
"type": "boolean",
"description": "True for F-1 filers."
}
}
}
},
"disclaimer": {
"type": "string"
}
}
}
},
"schema": {
"type": "object",
"required": [
"input"
],
"properties": {
"input": {
"type": "object"
},
"output": {
"type": "object"
}
}
},
"category": "finance",
"routeTemplate": "https://x402.professorsausages.com/ipo-calendar/expected"
},
"sample": {
"url": "https://x402.professorsausages.com/ipo-calendar/sample",
"hint": "A real cached response from this API (with its capture timestamp), free — judge the data quality before paying."
},
"catalog": {
"message": "You called IPO Calendar. Agents doing finance work commonly also use these — same pay-per-call model, each with a FREE real sample record (freeSample link):",
"related": [
{
"call": "/company?ref=xsell&v=related&from=ipo-calendar",
"name": "Company Enrichment (SEC EDGAR)",
"summary": "Company enrichment for agents — hand over a ticker, CIK, or name and get ground-truth SEC identity plus fin…",
"freeSample": "/company/sample?ref=xsell&v=related&from=ipo-calendar"
},
{
"call": "/sec-10k?ref=xsell&v=related&from=ipo-calendar",
"name": "SEC Annual Report (10-K)",
"summary": "U.S",
"freeSample": "/sec-10k/sample?ref=xsell&v=related&from=ipo-calendar"
},
{
"call": "/sec-10q?ref=xsell&v=related&from=ipo-calendar",
"name": "SEC Quarterly Report (10-Q)",
"summary": "U.S",
"freeSample": "/sec-10q/sample?ref=xsell&v=related&from=ipo-calendar"
}
],
"strategy": "related",
"catalogUrl": "https://x402.professorsausages.com/?ref=402&v=related&from=ipo-calendar"
},
"suggest": {
"url": "https://x402.professorsausages.com/suggest",
"hint": "Missing data you'd pay for? POST {want, would_pay_usd} — free. The most-requested datasets get built first."
},
"discount": {
"off": "50%",
"hint": "Send X-Intent: <40+ chars describing what you're building and what data you need> for 50% off this call.",
"header": "X-Intent"
}
}Provenance
- Seen in the source catalog
- 2026-07-30 04:52Z
- Last indexed by Roundhouse
- 2026-08-29 04:30Z
- Last enriched (probe, favicon, geo)
- 2026-09-10 19:15Z
- x402 version
- 2
- Max timeout
- 60s
- Liveness probe
- HTTP 402
Hand this page to an agent
Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.
GET api.roundhouseai.io/v0/endpoints
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 4 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service IPO Calendar and tell me whether it is worth paying: what a call costs, whether the endpoint answered when last probed, and what its payment record actually shows. curl -s 'https://api.roundhouseai.io/v0/endpoints?q=IPO%20Calendar' curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>' Then call it: read the price from the live 402 at https://x402.professorsausages.com/ipo-calendar/expected, never from a cached figure, and pay with an x402 client. The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except /v0/unified* and /v0/endpoints. Mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402, or use an organization key from https://roundhouseai.io/dashboard/team. If you do not have Roundhouse tools or skills installed, read https://roundhouseai.io/skill.md first — it is the whole procedure.