Recurrence Expander
Oddments sells small, narrowly-scoped services to software agents, priced in cents and paid per call over x402. Each one states what it cannot do, and returns output you can check without trusting us.
Searchoffline · HTTP 530eip155:8453Exactvia cdp
ScheduleCronRruleTimezoneDst
Activity
—
Nothing indexed for this service or its provider yet. Not a claim that it is unused — only that we hold no record.
$0.16
Verified settled volume
8 settlements proven x402 by their on-chain EIP-3009 marker.
$0.020
Listed price
As published in the catalog. Always read the live 402 before paying.
—
Calls · 30d
Upstream's own call count for this endpoint, not ours.
—
Unique payers · 30d
Last called 2026-08-11 23:45Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x0dd0003399dbf945013eC64142f12e89B3760000The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
Provider
The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.
Live 402 challenge
Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.
{
"docs": "https://s1.oddments.ai/",
"error": "payment_required",
"accepts": [
{
"asset": "USDC",
"payTo": "0x0dd0003399dbf945013eC64142f12e89B3760000",
"price": "$0.02",
"scheme": "exact",
"network": "eip155:8453"
}
],
"message": "This endpoint costs $0.02 per call, paid in USDC on Base via x402. Machine-readable requirements are in the 'payment-required' response header.",
"openapi": "https://s1.oddments.ai/openapi.json",
"x402Version": 2,
"what_you_get": "the exact UTC instants for each recurrence rule you send, with spring-forward times flagged nonexistent and fall-back times flagged ambiguous, the tzdata and library versions that produced them, and an Ed25519-signed reproducibility receipt binding the input hash, the output hash and those versions",
"what_you_send": "up to 25 rules, each with an RFC 5545 rrule or a 5-field POSIX cron, an IANA tz, an ISO-8601 local start, and up to 500 occurrences per rule. Full schema at https://s1.oddments.ai/openapi.json.",
"free_alternative": {
"url": "https://s1.oddments.ai/v1/preview",
"note": "Same response shape, 1 rule, 3 occurrences. No payment required.",
"method": "POST"
},
"what_you_do_not_get": "a calendar. This service expands the rules you send and consults no external source, so a holiday, exception or cancellation you did not encode in the rule is invisible to it. Answers are only as current as the tzdata version reported in every response, and the signature proves origin and integrity, not correctness."
}Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
0.02USDC≈ $0.02 USD
on Base · exact scheme
Pay 0.02 USDC on Base to 0x0dd0…60000. The signed payment is good for 5 minutes.
- Paid to
- 0x0dd0…60000
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 20000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x0dd0003399dbf945013eC64142f12e89B3760000",
"amount": "20000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
]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,
"description": "default occurrence count applied to any rule that omits its own 'count'"
},
"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,
"description": "occurrences to return for this rule; overrides the request's top-level 'limit' when set"
},
"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,
"description": "the batch of recurrence rules to expand in this call"
}
}
},
"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",
"description": "first 16 hex chars of SHA-256(public_key_b64); identifies which signing key was used"
},
"verify": {
"type": "object",
"description": "public key URL, verifier script URL, and what it does and does not prove"
},
"service": {
"type": "string",
"description": "the service name that issued this receipt, e.g. 'Recurrence Expander'"
},
"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",
"description": "base64-encoded Ed25519 signature over the canonical JSON of the fields named in signed_fields"
},
"signed_fields": {
"type": "array",
"items": {
"type": "string"
},
"description": "exactly which fields the signature covers"
},
"public_key_b64": {
"type": "string",
"description": "base64-encoded raw Ed25519 public key that verifies signature_b64. Not itself a signed field -- trust it only after checking it (or key_id) against the current or previous key published at /.well-known/oddments-receipts.json."
},
"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",
"description": "the IANA zone this rule's occurrences were expanded in, echoed from the request"
},
"kind": {
"type": "string",
"description": "'cron' or 'rrule'"
},
"count": {
"type": "integer",
"description": "number of occurrences returned for this rule"
},
"anomalies": {
"type": "array",
"items": {
"type": "string"
},
"description": "the distinct occurrence flags seen across this rule's occurrences (nonexistent_local, ambiguous_local), sorted; empty if none"
},
"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",
"description": "whether daylight saving was in effect at this occurrence"
},
"utc_offset": {
"type": "string",
"description": "the UTC offset in effect at this occurrence, format +HH:MM or -HH:MM"
}
}
},
"description": "the expanded instants for this rule, in generation order, one per requested count"
},
"crosses_dst_transition": {
"type": "boolean",
"description": "true if this rule's occurrences do not all share the same utc_offset, i.e. a DST transition falls within the expanded range"
}
}
},
"description": "one entry per input rule, in input order"
},
"total_occurrences": {
"type": "integer",
"description": "sum of occurrence counts across all results in this response"
}
}
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-08-11 23:45Z
- Last indexed by Roundhouse
- 2026-08-12 00:10Z
- Last enriched (probe, favicon, geo)
- 2026-09-21 06:45Z
- x402 version
- 2
- Max timeout
- 300s
- Liveness probe
- HTTP 530
Hand this page to an agent
Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.
GET api.roundhouseai.io/v0/endpoints
Nothing indexed for this service or its provider yet. Not a claim that it is unused — only that we hold no record. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service Recurrence Expander and tell me whether it is worth paying: what a call costs, whether the endpoint answered when last probed, and what its payment record actually shows. curl -s 'https://api.roundhouseai.io/v0/endpoints?q=Recurrence%20Expander' curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>' Then call it: read the price from the live 402 at https://s1.oddments.ai/v1/expand, never from a cached figure, and pay with an x402 client. The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except /v0/unified* and /v0/endpoints. Mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402, or use an organization key from https://roundhouseai.io/dashboard/team. If you do not have Roundhouse tools or skills installed, read https://roundhouseai.io/skill.md first — it is the whole procedure.