HubVibe: Pay-per-Call Agent Tools: Web Search, Email Verify, KYC Screening, Stocks, Crypto, News

Prediction market events

hubvibe_prediction_events

Read-onlyIdempotent

Top prediction market events: Polymarket events (groups of related markets) ranked by trading volume, with title, slug, end date and market count. Use it to see what the biggest prediction markets are right now. Input: optional limit. $0.05 per call. Returns: events[{id,title,slug,volume,end_date,market_count}], count.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`limit`	No	1-50, default 10.
`language`	No	Optional BCP-47 language tag (en, ja, ko, pt-BR): the human-readable strings of the result (notes, details, reasons) are translated into this language; data, codes, numbers and URLs are untouched. Default: as produced.

Output Schema

TableJSON Schema

Name	Required	Description	Default
`result`	Yes
`status`	Yes
`worker`	Yes
`price_usd`	Yes
`provenance`	Yes
`receipt_id`	Yes
`attribution`	No
`receipt_url`	Yes
`billing_warning`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed23 schema fields changedOct 1, 2026

removedOutput schema / description

Removed value: -"The 200 body of every paid /work call. `result` is the worker's own output (its schema is per route); everything else is the same on every /work route. A receipt for the job is at `receipt_url`."

removedOutput schema / properties / attribution / description

Removed value: -"Present only when the result's text was machine-translated: the credit to show with it."

removedOutput schema / properties / attribution / items / description
```
Removed value: -"A credit."
```

removedOutput schema / properties / attribution / items / properties

Removed value: -{
-  "text": {
-    "description": "Credit.",
-    "examples": [
-      "Translated by Google"
-    ],
-    "type": "string"
-  },
-  "url": {
-    "description": "Link.",
-    "examples": [
-      "https://translate.google.com"
-    ],
-    "type": "string"
-  }
-}

removedOutput schema / properties / attribution / items / required
```
Removed value: -[
-  "text",
-  "url"
-]
```
removedOutput schema / properties / attribution / items / type
```
Removed value: -"object"
```

removedOutput schema / properties / billing_warning / description

Removed value: -"Present only when the charge was recorded with a caveat."

removedOutput schema / properties / billing_warning / examples
```
Removed value: -[
-  "settlement pending"
-]
```
removedOutput schema / properties / price_usd / description
```
Removed value: -"What this call cost, in USD."
```
removedOutput schema / properties / price_usd / examples
```
Removed value: -[
-  0.02
-]
```

removedOutput schema / properties / provenance / description

Removed value: -"How the result was produced: which providers ran and how long each took."

removedOutput schema / properties / provenance / properties

Removed value: -{
-  "attempts": {
-    "description": "Provider attempts made, including retries and failovers.",
-    "examples": [
-      1
-    ],
-    "type": "integer"
-  },
-  "elapsed_ms": {
-    "description": "Wall-clock milliseconds for the whole job.",
-    "examples": [
-      340
-    ],
-    "type": "integer"
-  },
-  "providers_used": {
-    "description": "Providers that served the job.",
-    "examples": [
-      [
-        "coinbase-advanced-trade-public"
-      ]
-    ],
-    "items": {
-      "description": "Provider name.",
-      "examples": [
-        "coinbase-advanced-trade-public"
-      ],
-      "type": "string"
-    },
-    "type": "array"
-  },
-  "steps": {
-    "description": "Every step the job ran, in order.",
-    "items": {
-      "description": "One step of the job.",
-      "properties": {
-        "ms": {
-          "description": "Milliseconds the step took.",
-          "examples": [
-            312
-          ],
-          "type": "integer"
-        },
-        "ok": {
-          "description": "Whether the step succeeded.",
-          "examples": [
-            true
-          ],
-          "type": "boolean"
-        },
-        "provider": {
-          "description": "Provider that served the step.",
-          "examples": [
-            "coinbase-advanced-trade-public"
-          ],
-          "type": "string"
-        },
-        "reason": {
-          "description": "Failure reason, on a failed step.",
-          "examples": [
-            "provider_timeout"
-          ],
-          "type": "string"
-        },
-        "step": {
-          "description": "Step name inside the worker.",
-          "examples": [
-            "quote"
-          ],
-          "type": "string"
-        }
-      },
-      "required": [
-        "step",
-        "ok",
-        "ms"
-      ],
-      "type": "object"
-    },
-    "type": "array"
-  }
-}

removedOutput schema / properties / provenance / required

Removed value: -[
-  "steps",
-  "providers_used",
-  "attempts",
-  "elapsed_ms"
-]

removedOutput schema / properties / receipt_id / description
```
Removed value: -"Receipt id for this job."
```
removedOutput schema / properties / receipt_id / examples
```
Removed value: -[
-  "rcpt_9f1c2b3a4d5e6f70"
-]
```

removedOutput schema / properties / receipt_url / description

Removed value: -"Where to fetch the machine-readable receipt (free, no payment)."

removedOutput schema / properties / receipt_url / examples

Removed value: -[
-  "/work/receipts/rcpt_9f1c2b3a4d5e6f70"
-]

removedOutput schema / properties / result / properties

Removed value: -{
-  "count": {
-    "description": "Number of events returned.",
-    "examples": [
-      1
-    ],
-    "type": "integer"
-  },
-  "events": {
-    "description": "Events, highest volume first.",
-    "items": {
-      "description": "One event.",
-      "properties": {
-        "end_date": {
-          "description": "ISO 8601 end date.",
-          "examples": [
-            "2026-12-31T00:00:00Z"
-          ],
-          "type": [
-            "string",
-            "null"
-          ]
-        },
-        "id": {
-          "description": "Event id.",
-          "examples": [
-            "24011"
-          ],
-          "type": "string"
-        },
-        "market_count": {
-          "description": "Markets grouped under this event.",
-          "examples": [
-            6
-          ],
-          "type": "integer"
-        },
-        "slug": {
-          "description": "Event slug.",
-          "examples": [
-            "bitcoin-price-on-december-31"
-          ],
-          "type": "string"
-        },
-        "title": {
-          "description": "Event title.",
-          "examples": [
-            "Bitcoin price on December 31"
-          ],
-          "type": "string"
-        },
-        "volume": {
-          "description": "Traded volume in USD.",
-          "examples": [
-            5230100
-          ],
-          "type": [
-            "number",
-            "null"
-          ]
-        }
-      },
-      "required": [
-        "id",
-        "title",
-        "slug",
-        "market_count"
-      ],
-      "type": "object"
-    },
-    "type": "array"
-  },
-  "source": {
-    "const": "polymarket-gamma",
-    "description": "Data source.",
-    "type": "string"
-  }
-}

removedOutput schema / properties / result / required

Removed value: -[
-  "events",
-  "count",
-  "source"
-]

removedOutput schema / properties / status / description

Removed value: -"Present only on a delivered result."

removedOutput schema / properties / worker / description

Removed value: -"Catalog name of the worker that ran."

removedOutput schema / properties / worker / examples
```
Removed value: -[
-  "market.quote"
-]
```

removedOutput schema / title

Removed value: -"prediction.events response"

Changed1 schema field changedSep 28, 2026

addedOutput schema / properties / attribution

Added value: +{
+  "description": "Present only when the result's text was machine-translated: the credit to show with it.",
+  "items": {
+    "description": "A credit.",
+    "properties": {
+      "text": {
+        "description": "Credit.",
+        "examples": [
+          "Translated by Google"
+        ],
+        "type": "string"
+      },
+      "url": {
+        "description": "Link.",
+        "examples": [
+          "https://translate.google.com"
+        ],
+        "type": "string"
+      }
+    },
+    "required": [
+      "text",
+      "url"
+    ],
+    "type": "object"
+  },
+  "type": "array"
+}

Changed1 schema field changedSep 27, 2026

addedInput schema / properties / language

Added value: +{
+  "description": "Optional BCP-47 language tag (en, ja, ko, pt-BR): the human-readable strings of the result (notes, details, reasons) are translated into this language; data, codes, numbers and URLs are untouched. Default: as produced.",
+  "maxLength": 35,
+  "pattern": "^[A-Za-z]{2,3}(-[A-Za-z0-9]{2,8})*$",
+  "type": "string"
+}

Changed1 schema field changedSep 27, 2026

changedOutput schema / description

Previous value: -"The 200 body of every paid /work call. `result` is the worker's own output (its schema is per route); everything else is the same on all 38 routes. A receipt for the job is at `receipt_url`."New value: +"The 200 body of every paid /work call. `result` is the worker's own output (its schema is per route); everything else is the same on every /work route. A receipt for the job is at `receipt_url`."

AddedSep 24, 2026

TDQS

A3.7/5.0

Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already cover the safety and idempotency profile (readOnly, idempotent, openWorld). The description adds genuinely useful info beyond that: the $0.05 per call cost and the volume-based ranking/ordering behavior, which affects how results should be interpreted.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Front-loaded with the core definition and scope, then usage, input, cost, and return shape. Efficient, though the explicit return-field enumeration partially duplicates the output schema and could be trimmed.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

With an output schema present, the description needn't explain return values, and annotations carry the safety profile, so the definition is largely complete. The one real gap is sibling routing among the related prediction-market tools.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, with both the limit range/default and the BCP-47 language semantics fully documented in the schema. The description only restates 'Input: optional limit', so it adds no meaning beyond the schema; baseline 3 applies.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb+resource with scope: 'Polymarket events (groups of related markets) ranked by trading volume', and lists the fields returned. It is clear what the tool does, but it never names or contrasts with the closely related sibling tools hubvibe_prediction_market or hubvibe_market_prediction, so sibling differentiation is missing.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

'Use it to see what the biggest prediction markets are right now' gives an implied use case, but there are no explicit when-not conditions and no routing to alternatives despite multiple prediction/market siblings that an agent would need to disambiguate.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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