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KHOTEM Quantum Circuit Simulator (qsim)
x402
KHOTEM Quantum Circuit Simulator (qsim) is a paid API for AI agents from khotem.com, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-13).
Simulates a quantum circuit defined by gates and qubits, returning measurement results, paid via x402 micropayment with no account or API key required.
Price / call$0.1
Success—
StatusUnknown
How this service works
Paid cryptographic witness services for autonomous agents and humans: seals, attestations, verification, audit, sealed document thread. x402-native micropayments, USDC on Base / Polygon / Solana, direct on-chain verification. No accounts, no API keys, no KYC.
Output
Returns shot-based measurement results from the simulated quantum circuit, typically including counts or probability distributions over basis states (e.g. {'00': 512, '11': 512} for a Bell state), representing the statistical outcomes of the specified number of circuit executions.
Example use cases
Bell state entanglement simulation
“Run a 2-qubit Bell state circuit — Hadamard on qubit 0, then CNOT on qubits 0 and 1 — for 512 shots and show me the probability distribution of measurement outcomes.”
Quantum algorithm prototyping on a budget
“I'm prototyping a 3-qubit Grover's algorithm circuit with these gates and I want to simulate it for 1000 shots to check the output distribution before I run it on real hardware — can you do that for a small per-call fee?”
Randomness source via quantum measurement
“Set up a 1-qubit circuit with a Hadamard gate and measure it 2048 times so I can use the bit-flip results as a quantum random number source — pay per call with no signup.”
Technical details
Endpoint
POSThttps://khotem.com/api/qsimWhen to prefer
Choose this endpoint when you need a quick, pay-per-use quantum circuit simulation with no account setup, no API keys, and no KYC — ideal for autonomous agents or developers who want to prototype quantum algorithms or generate quantum-random outputs cheaply and permissionlessly using USDC micropayments on Base, Polygon, or Solana.
Side effects
- Invalid gates array format or unsupported gate types returns an error
- Qubit count mismatch with gate operands causes circuit validation failure
- Payment not received or insufficient USDC causes 402 rejection before execution
- Too many shots or too many qubits may exceed compute limits and return a resource error
- Malformed JSON body returns 400 bad request
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| gatesrequired | array | |
| shots | integer | |
| qubitsrequired | integer |
Tags
x402
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