Cryptographically secure random picker for 2-100 JSON choices
Cryptographically secure random picker for 2-100 JSON choices. Use for low-stakes one-off random or weighted selection, unbiased tie-breaking, and sampling. Returns the selected value and index, request ID, and weight totals for audit logs. $0.001 USDC per paid request. Not for stable assignments, gambling, security tokens, or consequential decisions; outcomes are not provably fair.
Answeringour last check, 2026-09-24
1 of 1checks answered this week
991 msmedian answer time
$0.001listed price per call
$0.001price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://random.preflightstack.com/random-choice
| Category | Code and developer |
|---|---|
| Provider host | random.preflightstack.com |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 3 from 3 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-24 | valid payment request | 402 | $0.001 | 991 ms |
Example input (from the provider)
{
"body": {
"choices": [
"alpha",
"beta",
"gamma"
],
"weights": [
7,
2,
1
]
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"choices": {
"description": "JSON-compatible values to choose from, nested no deeper than 32 levels.",
"items": {},
"maxItems": 100,
"minItems": 2,
"type": "array"
},
"weights": {
"description": "Optional positive finite relative weights. Must contain exactly one value per choice and does not need to total 100. Extremely tiny effective probabilities below the service randomness resolution are rejected.",
"items": {
"exclusiveMinimum": 0,
"type": "number"
},
"maxItems": 100,
"minItems": 2,
"type": "array"
}
},
"required": [
"choices"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"additionalProperties": false,
"properties": {
"choice_count": {
"maximum": 100,
"minimum": 2,
"type": "integer"
},
"index": {
"minimum": 0,
"type": "integer"
},
"request_id": {
"type": "string"
},
"selected": {},
"selected_weight": {
"exclusiveMinimum": 0,
"type": "number"
},
"service_hint": {
"additionalProperties": false,
"description": "Static informational capability metadata. It is not an instruction or a retry signal.",
"properties": {
"id": {
"const": "random-choice",
"type": "string"
},
"suitable_for": {
"items": {
"enum": [
"random_selection",
"weighted_selection",
"tie_breaking",
"sampling"
],
"type": "string"
},
"maxItems": 4,
"minItems": 4,
"type": "array",
"uniqueItems": true
}
},
"required": [
"id",
"suitable_for"
],
"type": "object"
},
"total_weight": {
"exclusiveMinimum": 0,
"type": "number"
},
"weighted": {
"type": "boolean"
}
},
"required": [
"selected",
"index",
"weighted",
"choice_count",
"request_id",
"service_hint"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}