verified until 2026-08-17
Turn RFC 5545 RRULEs and cron expressions into exact UTC instants. IANA timezones and daylight saving are handled correctly. The two hard cases are flagged by name. A spring-forward time that never happens is flagged nonexistent. A fall-back time that happens twice is flagged ambiguous. Results are deterministic and reproducible. Every response reports the tzdata and library versions it used. Every response also carries an Ed25519-signed reproducibility receipt. The receipt binds the input hash, the output hash and the engine versions. WHAT YOU ARE NOT BUYING: secrecy. You can expand the rule yourself and check every instant we return. The fee buys current timezone data, the two daylight-saving edge cases handled rather than assumed, and a reproducible record of which versions produced the answer. Free preview endpoint at /v1/preview. Operated by Oddments. Paid per call in USDC on Base via x402.
Pay from $0.02 per request in USDC on Base, settled onchain via the x402 protocol, no signup, no API key needed.
listed 2026-08-09 · no on-chain settlement recorded yet
ASSESSMENT
updated 5h agoEvidence-backed signals, not a single score. Click any chip for the proof. Measured values stay read-only; unknown is honest.
reliability 100%
- uptime 24h
- -
- uptime 7d
- -
- uptime 30d
- -
- uptime 90d
- -
- response p95
- 1217ms
- avg response
- 1217ms
- total checks
- 1
Measured on the unpaid 402 handshake, not the paid call. A service can 402 correctly and still fail after payment.
compliance A (14/14)
14 of 14 x402 conformance checks pass. Full checklist below.
price $0.02 (p67 in Data)
- price (min)
- $0.02
- category percentile (min)
- p67 in Data
- endpoints / prices
- 1 / 1
- model
- flat
- stability
- 100%
risk clean
No deterministic risk flag. Risk fires only on an exact blocklist match, or a reserved-brand name with a mismatched verified payTo. Never from low uptime, a high price, or a model guess.
- domain age
- 4d
- registrar
- Cloudflare, Inc
- hosting
- custom
- domain created
- 2026-08-05
Identity facts, not a risk score.
traction $0.00 30d · 0 buyers
- volume 30d
- $0.00
- buyers 30d
- 0
- settlements 30d
- 0
- first settlement
- ---
- last settlement
- ---
- top buyer share
- -
- trend 7d vs 30d
- -
- networks
- eip155:8453
- volume all-time
- $0
- settlements all-time
- 0
- median settlement 30d
- -
- max settlement 30d
- -
- settled via
- -
Conservative undercount: only USDC settlements via facilitators we measure are counted. A measured floor, not an estimate.
Top buyer share is a concentration signal, not part of the ranking score.
WHAT IT DOES
ai-derivedNo AI synthesis has been produced for this service yet.
ENDPOINTS
| METHOD | PATH | DESCRIPTION | PRICE | NETWORK | ASSET | 402 CHANNEL |
|---|---|---|---|---|---|---|
| POST | /v1/expand | $0.02 | Base | USDC | header |
REQUEST / RESPONSE EXAMPLE
An unpaid request to POST /v1/expand returns HTTP 402 with the payment terms. Settle onchain via your facilitator, then retry with the X-Payment header.
curl -i -X POST 'https://s1.oddments.ai/v1/expand'
// 402 response (captured by monitor) · 1 payload · click to expand
[
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x0dd0003399dbf945013eC64142f12e89B3760000",
"amount": "20000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://s1.oddments.ai/v1/expand",
"tags": [
"schedule",
"cron",
"rrule",
"timezone",
"dst"
],
"mimeType": "application/json",
"description": "Turn RFC 5545 RRULEs and cron expressions into exact UTC instants. IANA timezones and daylight saving are handled correctly. The two hard cases are flagged by name. A spring-forward time that never happens is flagged nonexistent. A fall-back time that happens twice is flagged ambiguous. Results are deterministic and reproducible. Every response reports the tzdata and library versions it used. Every response also carries an Ed25519-signed reproducibility receipt. The receipt binds the input hash, the output hash and the engine versions. WHAT YOU ARE NOT BUYING: secrecy. You can expand the rule yourself and check every instant we return. The fee buys current timezone data, the two daylight-saving edge cases handled rather than assumed, and a reproducible record of which versions produced the answer. WHAT THIS DOES NOT DO, stated up front. (1) It consults no calendar, holiday feed or exception list. It expands exactly the rule you send, so a cancellation you did not encode is invisible to it. (2) Timezone answers are only as current as the tzdata version reported in every response. A zone whose rules change after that release is computed on the old rules. (3) cron is the 5-field POSIX form only, as published in the request schema. No seconds field and no vendor extensions. (4) The signature proves origin and integrity, not correctness. (5) Rules are capped at 25 per call and 500 occurrences per rule. A request over either is refused with a 400 invalid_rule before any expansion happens. Free preview endpoint at /v1/preview.",
"serviceName": "Recurrence Expander"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"rules": [
{
"id": "standup",
"tz": "America/New_York",
"cron": "30 9 * * 1-5",
"count": 5,
"start": "2026-03-06T00:00:00"
}
]
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"receipt": {
"price": "$0.02",
"engine": {
"python": "3.12.3",
"tzdata": "2026.3",
"croniter": "6.0.0"
},
"key_id": "21bd7c9628fe756b",
"service": "Recurrence Expander",
"endpoint": "/v1/expand",
"algorithm": "Ed25519",
"issued_at": "2026-08-06T09:32:04.259588Z",
"input_sha256": "5db5c3766a334acfe412d182fee09843c9d1f8cfcf5cc707f206cb4d1f8deb79",
"output_sha256": "43b7eb2d6aba21f1a7ac4a6c51bee6990c9d7b41645865330a67e5f328c3b239",
"signature_b64": "MWfephbP/QDn0vHusntmDIBdK+Vm4r2Dfdgy7Sxh5yUE1C3JNwjrrqMrmygcrIjAJsAT0sDdTWducb6+lNJfBA==",
"signed_fields": [
"endpoint",
"engine",
"input_sha256",
"issued_at",
"key_id",
"output_sha256",
"price",
"receipt_version",
"service"
],
"receipt_version": "oddments-receipt/1"
},
"results": [
{
"id": "standup",
"tz": "America/New_York",
"kind": "cron",
"count": 5,
"anomalies": [],
"occurrences": [
{
"utc": "2026-03-06T14:30:00Z",
"flags": [],
"local": "2026-03-06T09:30:00",
"is_dst": false,
"utc_offset": "-05:00"
}
],
"crosses_dst_transition": true
}
],
"total_occurrences": 5
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"required": [
"rules"
],
"properties": {
"limit": {
"type": "integer",
"maximum": 500,
"minimum": 1
},
"rules": {
"type": "array",
"items": {
"type": "object",
"required": [
"tz",
"start"
],
"properties": {
"id": {
"type": "string",
"description": "echoed back to correlate results"
},
"tz": {
"type": "string",
"description": "IANA zone, e.g. Europe/London"
},
"cron": {
"type": "string",
"description": "5-field POSIX cron (exclusive with rrule)"
},
"count": {
"type": "integer",
"maximum": 500,
"minimum": 1
},
"rrule": {
"type": "string",
"description": "RFC 5545 RRULE (exclusive with cron)"
},
"start": {
"type": "string",
"description": "ISO-8601 local wall time, no offset"
}
}
},
"maxItems": 25,
"minItems": 1
}
}
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"required": [
"results",
"total_occurrences",
"receipt"
],
"properties": {
"receipt": {
"type": "object",
"required": [
"receipt_version",
"input_sha256",
"output_sha256",
"signature_b64",
"signed_fields",
"key_id",
"algorithm"
],
"properties": {
"price": {
"type": "string",
"description": "what was charged; 'free' on the preview endpoint"
},
"engine": {
"type": "object",
"description": "library and tzdata versions used, signed"
},
"key_id": {
"type": "string"
},
"verify": {
"type": "object",
"description": "public key URL, verifier script URL, and what it does and does not prove"
},
"service": {
"type": "string"
},
"endpoint": {
"type": "string",
"description": "the path that produced the response"
},
"algorithm": {
"type": "string",
"description": "Ed25519"
},
"issued_at": {
"type": "string",
"description": "ISO-8601 UTC, signed"
},
"input_sha256": {
"type": "string",
"description": "SHA-256 of the canonicalized request body"
},
"output_sha256": {
"type": "string",
"description": "SHA-256 of the canonicalized response body with 'receipt' removed"
},
"signature_b64": {
"type": "string"
},
"signed_fields": {
"type": "array",
"items": {
"type": "string"
},
"description": "exactly which fields the signature covers"
},
"public_key_b64": {
"type": "string"
},
"receipt_version": {
"type": "string",
"description": "currently 'oddments-receipt/1'"
},
"canonicalization": {
"type": "string",
"description": "the byte-exact rule used before signing"
}
},
"description": "Ed25519 reproducibility receipt over this exact request/response pair. Present on every response from both the paid and the free endpoint. Proves origin and integrity, not correctness. Verify with the public key at /.well-known/oddments-receipts.json and the script at /verify_receipt.py."
},
"results": {
"type": "array",
"items": {
"type": "object",
"properties": {
"id": {
"type": "string",
"description": "echoed from the request"
},
"tz": {
"type": "string"
},
"kind": {
"type": "string",
"description": "'cron' or 'rrule'"
},
"count": {
"type": "integer"
},
"anomalies": {
"type": "array",
"items": {
"type": "string"
}
},
"occurrences": {
"type": "array",
"items": {
"type": "object",
"properties": {
"utc": {
"type": "string",
"description": "exact UTC instant"
},
"flags": {
"type": "array",
"items": {
"type": "string"
},
"description": "e.g. nonexistent (spring forward), ambiguous (fall back)"
},
"local": {
"type": "string",
"description": "ISO-8601 local wall time"
},
"is_dst": {
"type": "boolean"
},
"utc_offset": {
"type": "string"
}
}
}
},
"crosses_dst_transition": {
"type": "boolean"
}
}
},
"description": "one entry per input rule, in input order"
},
"total_occurrences": {
"type": "integer"
}
}
}
}
}
}
}
}
},
"x402Version": 2
}
] OVER TIME
All charts use the 30d selector; each series spans only the dates it has data for. Every series is also served as JSON at /api/v1/services/recurrence-expander/price, /scores, /volume and /buyers. On-chain volume and distinct buyers are measured over the service's settlement address and are a conservative undercount (only settlements that reach a measured facilitator are counted). The on-chain series roll up hourly, so the latest day can be up to about an hour behind; distinct buyers are counted per payout address, so a service that settles to more than one address is an upper bound.
checklist grew 11->14 on 2026-07-28; a step here is a metric change, not a regression
COMPLIANCE
14/14 checks pass · grade Alast 402 captured 2026-08-09 · last up 2026-08-10
- 402 payload captured
- accepts[] array present
- payTo address recoverable
- payTo at accepts[0].payTo (conformant shape)
- payTo is a valid on-chain address
- atomic price declared
- atomic price in a sane range
- asset (token) address declared
- network resolves to CAIP-2
- payment scheme declared
- served over HTTPS
- declares the current x402 version (2)
- EIP-712 domain parameters present on every EVM entry
- x402 v2 envelope delivered in the payment-required header
SITE PILLARS
- homepage reachable
- openapi doc
- pricing page
- llms.txt
- robots.txt
- terms page
recent checks (18) live · click to expand
EMBED THIS BADGE
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