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Delx Commerce — Choice Index (Seeded Random Selection)
x402
Delx Commerce — Choice Index (Seeded Random Selection) is a paid API for AI agents from commerce.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-01).
Returns a deterministic, seeded random index within a given range, useful for reproducible choice selection in agent workflows.
Price / call$0.001
Success—
StatusUnknown
How this service works
Pay-per-result APIs for agents. No signup. Exact price. Verifiable delivery. USDC on Base + Solana via x402.
Output
Returns a JSON object with 'ok' (boolean success flag), 'index' (the computed integer index, 0-based, within the given length), 'length' (the range provided), and 'schema' (a versioned schema identifier 'delx/util-choice-index/v1') confirming the computation type.
Example use cases
Reproducible agent A/B routing
“I have 3 response variants and I want to pick one deterministically using the session ID 'sess-abc123' as the seed — which index from 0 to 2 should I use?”
Daily random prompt selection
“I have 7 writing prompts and I want to pick one for today using today's date '2025-06-10' as a seed — which index should I pick?”
Weighted round-robin agent task assignment
“I have 4 agent workers and a task ID 'task-9872' — use that as a seed to deterministically pick which worker index from 0 to 3 should handle it.”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/choice-index?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need fast, cheap, reproducible random index selection seeded by a string — ideal for agent workflows requiring deterministic sampling, consistent A/B routing, or repeatable choice logic without implementing local PRNG. Prefer it over local randomness when you want verifiable, pay-per-result delivery with no API key setup.
Side effects
- Missing or empty seed string results in a validation error
- Length of 0 or negative integer may return an error or undefined behavior
- Non-integer length value causes schema validation failure
- Payment failure via x402 results in HTTP 402 response blocking the call
- Malformed JSON body returns a 400-level error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| seed | string | Input field: seed. |
| length | integer | Input field: length. |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"index": 3,
"length": 5,
"schema": "delx/util-choice-index/v1"
}
}Tags
x402
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