RRULE Recurrence Expander
RRULE expander: expand an RFC 5545 recurrence rule into concrete occurrence timestamps. Accepts an RRULE string with DTSTART, an IANA time zone, and optional EXDATE and RDATE lists, and returns up to 200 occurrences as both local wall-clock times and UTC instants. Supports FREQ, INTERVAL, COUNT, UNTIL, BYDAY, BYMONTHDAY, BYMONTH, BYSETPOS and WKST. Occurrences moved by a DST gap carry gap: true. Rules needing over 50,000 candidate evaluations are rejected.
Offering
- Provider
- api.duoleads.com
- Method
- GET
- Offering type
- Api Endpoint
- Transport type
- http
- Category
- General Utilities
- Delivery
- Not provided
- Pricing model
- Not provided
- x402 version
- 2
Endpoint context
- URL
https://api.duoleads.com/v1/time/rrule- MIME type
- application/json
- First seen
- 2026-10-16T01:50:38.788Z
- Last seen
- Tags
- rrule, recurrence, recurring-events, calendar, Time
Payment pricing
x402 payment terms are the authoritative price for calling this endpoint.
- Payment option 1
- 0.05 USDC
Atomic price: 50000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Raw x402 terms
[
{
"scheme": "exact",
"network": "eip155:8453",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount": "50000",
"payTo": "0xCD673f7e1daD254347AEab6be0DEFe8b9C6b3A39"
}
]Observed health
- Status
- Healthy
- Latest latency
- 365 ms
- Average latency
- 347 ms
- HTTP status
- 402
- Last checked
- Reachability
- 100% over 14 checks
Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.
Input schema
{
"type": "object",
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"type": "string",
"enum": [
"GET"
]
},
"queryParams": {
"type": "object",
"properties": {
"rrule": {
"type": "string",
"description": "RFC 5545 RRULE, e.g. FREQ=MONTHLY;BYDAY=-1FR;COUNT=6.",
"maxLength": 512
},
"dtstart": {
"type": "string",
"description": "First occurrence, YYYY-MM-DDTHH:MM:SS local to zone.",
"maxLength": 32
},
"zone": {
"type": "string",
"description": "IANA time zone id.",
"maxLength": 64
},
"count": {
"type": "string",
"description": "Maximum occurrences to return, 1-200. Default 20.",
"pattern": "^[+-]?\\d+$",
"maxLength": 64,
"default": "20"
},
"after": {
"type": "string",
"description": "RFC 3339 instant; skip occurrences before it.",
"maxLength": 64
},
"exdate": {
"type": "string",
"description": "Comma-separated local datetimes to exclude.",
"maxLength": 1024
},
"rdate": {
"type": "string",
"description": "Comma-separated local datetimes to add.",
"maxLength": 1024
}
},
"required": [
"rrule",
"dtstart",
"zone"
]
}
},
"required": [
"type",
"method"
],
"additionalProperties": false
}Output schema
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"after": {
"description": "RFC 3339 instant; skip occurrences before it.",
"maxLength": 64,
"type": "string"
},
"count": {
"default": "20",
"description": "Maximum occurrences to return, 1-200. Default 20.",
"maxLength": 64,
"pattern": "^[+-]?\\d+$",
"type": "string"
},
"dtstart": {
"description": "First occurrence, YYYY-MM-DDTHH:MM:SS local to zone.",
"maxLength": 32,
"type": "string"
},
"exdate": {
"description": "Comma-separated local datetimes to exclude.",
"maxLength": 1024,
"type": "string"
},
"rdate": {
"description": "Comma-separated local datetimes to add.",
"maxLength": 1024,
"type": "string"
},
"rrule": {
"description": "RFC 5545 RRULE, e.g. FREQ=MONTHLY;BYDAY=-1FR;COUNT=6.",
"maxLength": 512,
"type": "string"
},
"zone": {
"description": "IANA time zone id.",
"maxLength": 64,
"type": "string"
}
},
"required": [
"rrule",
"dtstart",
"zone"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"data": {
"properties": {
"count": {
"type": "integer"
},
"occurrences": {
"items": {
"properties": {
"dst": {
"type": "boolean"
},
"epoch_ms": {
"type": "integer"
},
"gap": {
"type": "boolean"
},
"instant": {
"type": "string"
},
"local": {
"type": "string"
},
"offset": {
"type": "string"
}
},
"required": [
"local",
"instant",
"epoch_ms",
"offset",
"dst"
],
"type": "object"
},
"type": "array"
},
"rule": {
"properties": {
"byday": {
"items": {
"type": "string"
},
"type": "array"
},
"byhour": {
"items": {
"type": "integer"
},
"type": "array"
},
"byminute": {
"items": {
"type": "integer"
},
"type": "array"
},
"bymonth": {
"items": {
"type": "integer"
},
"type": "array"
},
"bymonthday": {
"items": {
"type": "integer"
},
"type": "array"
},
"bysecond": {
"items": {
"type": "integer"
},
"type": "array"
},
"bysetpos": {
"items": {
"type": "integer"
},
"type": "array"
},
"count": {
"type": "integer"
},
"freq": {
"type": "string"
},
"interval": {
"type": "integer"
},
"until": {
"type": "string"
},
"wkst": {
"type": "string"
}
},
"required": [
"freq",
"interval",
"wkst"
],
"type": "object"
},
"truncated": {
"type": "boolean"
},
"zone": {
"type": "string"
}
},
"required": [
"occurrences",
"count",
"truncated",
"rule",
"zone"
],
"type": "object"
},
"meta": {
"properties": {
"computed_at": {
"description": "RFC 3339 UTC with milliseconds",
"type": "string"
},
"deterministic": {
"type": "boolean"
},
"disclaimer": {
"type": "string"
},
"price_usd": {
"type": "string"
},
"request_id": {
"type": "string"
},
"sources": {
"items": {
"required": [
"id",
"version",
"published"
],
"type": "object"
},
"type": "array"
}
},
"required": [
"request_id",
"computed_at",
"price_usd",
"deterministic",
"disclaimer"
],
"type": "object"
},
"ok": {
"const": true
},
"route": {
"const": "/v1/time/rrule"
},
"version": {
"type": "string"
}
},
"required": [
"ok",
"route",
"version",
"data",
"meta"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}