Observable expectation values

Name: Observable expectation values
Price: 0.016001 USDC
Availability: InStock

Calculate X, Y and Z Pauli expectations for a supplied valid single-qubit density matrix. Returns basis conventions; not a hardware measurement.

OtherLiveeip155:8453Exactvia cdp

https://www.mahastrategies.com/api/v1/micro/quantum-observable-expectations

QuantumScienceCalculatorBounded-computationEvidence

Calls · 30d

1→ 0%

This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 20 snapshots so far.

$71.48

Verified settled volume

1,272 settlements proven x402 by their on-chain EIP-3009 marker.

$0.016

Listed price

As published in the catalog. Always read the live 402 before paying.

Calls · 30d

Upstream's own call count for this endpoint, not ours.

Unique payers · 30d

Last called 2026-10-12 05:14Z

—

Upstream on-chain volume

Reported by the source catalog.

Paid to

0xec84c1cd6602bbe387bc8e6f0d3c062f2762de28

The 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.

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

0.016001USDC≈ $0.016001 USD

on Base · exact scheme

Pay 0.016001 USDC on Base to 0xec84…2de28. The signed payment is good for 1 minute.

Paid to: 0xec84…2de28
USD Coin contract: 0x8335…02913
Payment window: 1 minute
As published: 16001 smallest units

16001units

on Arbitrum · exact scheme

That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.

Paid to: 0xec84…2de28
Token contract: 0xaf88…e5831
Payment window: 1 minute

The catalog’s raw entry

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    "scheme": "exact",
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Extensions

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Provenance

Seen in the source catalog: 2026-10-12 05:14Z
Last indexed by Roundhouse: 2026-10-26 17:40Z
Last enriched (probe, favicon, geo): 2026-10-12 06:16Z
x402 version: 2
Max timeout: 60s
Liveness probe: HTTP 200

Report

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. 20 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.

Open skill.md

Show the prompt

Using Roundhouse, look up the x402 service Observable expectation values 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=Observable%20expectation%20values'
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://www.mahastrategies.com/api/v1/micro/quantum-observable-expectations, 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. Either pay over x402 (mint a personal key for $0.01 at
GET https://api.roundhouseai.io/v0/test/x402), or ask me for an organization key, which I create at
https://roundhouseai.io/dashboard/connections. If you have neither, ask before going further.

If you do not have Roundhouse tools or skills installed, read
https://roundhouseai.io/skill.md first — it is the whole procedure.