Four actions on one endpoint
Four actions on one endpoint. create opens a slot with its position, length, reserve price and closing time, and returns an admin token that only the opener holds. bid places a sealed bid, checked against the reserve, the slot length and the publisher's excluded categories before it is accepted — a rejected bid is recorded with its reason rather than silently dropped, so a bidder can see why it never competed.
Answeringour last check, 2026-10-18
1 of 1checks answered this week
1189 msmedian answer time
$0.004listed price per call
$0.004price 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://audio.halowerk.com/ad-slot-auction
| Category | Image and media |
|---|---|
| Provider host | audio.halowerk.com |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 2 from 2 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-18 | valid payment request | 402 | $0.004 | 1189 ms |
Example input (from the provider)
{
"body": {
"action": "create",
"closes_at_unix": 1793735685,
"position": "mid_roll",
"publisher": "HALOWERK example publisher",
"reserve_usdc": 5,
"slot_label": "episode 1, mid-roll 1",
"slot_seconds": 30
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"action": {
"description": "create opens a slot, bid places a sealed bid, close settles it, status reads it.",
"enum": [
"create",
"bid",
"close",
"status"
],
"type": "string"
},
"admin_token": {
"description": "Required for close. Returned once by create.",
"maxLength": 128,
"type": "string"
},
"amount_usdc": {
"description": "Sealed bid amount. bid only.",
"maximum": 100000,
"minimum": 0,
"type": "number"
},
"auction_id": {
"description": "Required for bid, close and status.",
"maxLength": 64,
"type": "string"
},
"bidder": {
"description": "Who is bidding. bid only.",
"maxLength": 120,
"type": "string"
},
"category": {
"description": "Advertiser category, checked against the exclusions. bid only.",
"maxLength": 40,
"type": "string"
},
"closes_at_unix": {
"description": "Closing time in Unix seconds. create only. At most 30 days out.",
"minimum": 0,
"type": "integer"
},
"creative_seconds": {
"description": "Length of the advertisement, checked against the slot. bid only.",
"maximum": 180,
"minimum": 1,
"type": "integer"
},
"excluded_categories": {
"description": "Advertiser categories the publisher refuses. create only.",
"items": {
"maxLength": 40,
"type": "string"
},
"maxItems": 20,
"type": "array"
},
"expected_listeners": {
"description": "Reach the publisher claims. Recorded as a claim, not verified. create only.",
"maximum": 100000000,
"minimum": 0,
"type": "integer"
},
"position": {
"description": "Where the slot sits in the content. create only.",
"enum": [
"pre_roll",
"mid_roll",
"post_roll"
],
"type": "string"
},
"publisher": {
"description": "Name of the publisher offering the slot. create only.",
"maxLength": 120,
"type": "string"
},
"reserve_usdc": {
"description": "Price below which the slot is not sold. create only.",
"maximum": 100000,
"minimum": 0,
"type": "number"
},
"slot_label": {
"description": "What is being sold, for example \"episode 41, mid-roll 2\". create only.",
"maxLength": 200,
"type": "string"
},
"slot_seconds": {
"description": "Length of the slot. create only.",
"maximum": 180,
"minimum": 5,
"type": "integer"
}
},
"required": [
"action"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}