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Compute Spot Prices

compute_spot_prices

One timestamped snapshot of observed GPU asks, not quotes — listings may be gone when you rent. Observes only; never rents, reserves, or holds. Omit gpu for the per-class snapshot. Default type ondemand; use bid for the interruptible spot auction. GET the paid_url with an x402 v2 PAYMENT-SIGNATURE header carrying the USDC authorization. Paid tool — $0.25 per snapshot, USDC on Base or Arbitrum One. Paid URL: https://aemb.pro/v1/markets/compute/spot.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
gpuNoOptional GPU model filter, e.g. 'H100 SXM'
typeNoOffer type: ondemand (fixed price), bid (interruptible auction — shown price is the bid floor), or reserved (longer commitment)
max_gpusNoMaximum GPU count per offer; integer 1..64
min_gpusNoMinimum GPU count per offer; integer >= 1
verifiedNoWhen true, only verified hosts; when false, only unverified hosts
max_resultsNoMax offers to return; integer 1-25
min_reliabilityNoMinimum host reliability 0..1 (inclusive); hosts below it are excluded

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
howYesHow to pay: GET the paid_url with an x402 v2 PAYMENT-SIGNATURE header carrying the USDC authorization
toolYesTool name: compute_spot_prices
assetYesSettlement asset
priceYesExact price, e.g. "$0.25"
networksYesEVM CAIP-2 network ids accepted
paid_urlYesx402-paid HTTPS URL to GET (with query params) for the market snapshot
facilitatorYesx402 facilitator
payment_requiredYesAlways true: this MCP tool is a payment pointer; the tool itself is monetized via x402.

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed2 schema fields changed
    • addedInput schema / properties / max_gpus
      Added value: +{
+  "description": "Maximum GPU count per offer; integer 1..64",
+  "maximum": 64,
+  "minimum": 1,
+  "type": "integer"
+}
    • changedInput schema / properties / type / description
      Previous value: -"Offer type filter: ondemand, bid, or reserved"New value: +"Offer type: ondemand (fixed price), bid (interruptible auction — shown price is the bid floor), or reserved (longer commitment)"
  2. Changed6 schema fields changed
    • addedInput schema / properties / gpu / description
      Added value: +"Optional GPU model filter, e.g. 'H100 SXM'"
    • addedInput schema / properties / max_results / description
      Added value: +"Max offers to return; integer 1-25"
    • addedInput schema / properties / min_gpus / description
      Added value: +"Minimum GPU count per offer; integer >= 1"
    • addedInput schema / properties / min_reliability
      Added value: +{
+  "description": "Minimum host reliability 0..1 (inclusive); hosts below it are excluded",
+  "maximum": 1,
+  "minimum": 0,
+  "type": "number"
+}
    • addedInput schema / properties / type / description
      Added value: +"Offer type filter: ondemand, bid, or reserved"
    • addedInput schema / properties / verified / description
      Added value: +"When true, only verified hosts; when false, only unverified hosts"
  3. Changed5 schema fields changed
    • removedInput schema / properties / gpu / description
      Removed value: -"Class, e.g. H100 SXM, RTX 4090. Omit for the whole-market snapshot."
    • removedInput schema / properties / max_results / description
      Removed value: -"max offers returned for a single-class query (default 5, max 25)"
    • removedInput schema / properties / min_gpus / description
      Removed value: -"minimum unit count per offer"
    • removedInput schema / properties / type / description
      Removed value: -"Pricing mode: ondemand (default), bid = interruptible spot, reserved"
    • removedInput schema / properties / verified / description
      Removed value: -"true = identity-checked hosts only; omit = all hosts"
  4. Changed3 schema fields changed
    • changedInput schema / properties / gpu / description
      Previous value: -"GPU class, e.g. H100 SXM, RTX 4090. Omit for the whole-market snapshot."New value: +"Class, e.g. H100 SXM, RTX 4090. Omit for the whole-market snapshot."
    • changedInput schema / properties / max_results / description
      Previous value: -"max offers returned for a single-GPU query (default 5, max 25)"New value: +"max offers returned for a single-class query (default 5, max 25)"
    • changedInput schema / properties / min_gpus / description
      Previous value: -"minimum GPU count per offer"New value: +"minimum unit count per offer"
  5. Changed26 schema fields changed
    • changedInput schema / properties / gpu / description
      Previous value: -"GPU class, e.g. H100 SXM, H100 NVL, H200, B200. Omit for the whole-market snapshot."New value: +"GPU class, e.g. H100 SXM, RTX 4090. Omit for the whole-market snapshot."
    • removedInput schema / properties / source
      Removed value: -{
-  "description": "Upstream source (default vast-ai)",
-  "enum": [
-    "vast-ai",
-    "gpurentalprices",
-    "price-book"
-  ],
-  "type": "string"
-}
    • addedOutput schema / properties / asset
      Added value: +{
+  "description": "Settlement asset",
+  "type": "string"
+}
    • removedOutput schema / properties / classes
      Removed value: -{
-  "description": "Per-class aggregates (whole-market snapshot only)",
-  "items": {
-    "additionalProperties": false,
-    "properties": {
-      "cheapest_rentable": {
-        "anyOf": [
-          {
-            "additionalProperties": {},
-            "type": "object"
-          },
-          {
-            "type": "null"
-          }
-        ]
-      },
-      "gpu_class": {
-        "type": "string"
-      },
-      "median_price_per_gpu_hour_usd": {
-        "type": [
-          "number",
-          "null"
-        ]
-      },
-      "offers_observed": {
-        "type": "number"
-      }
-    },
-    "required": [
-      "gpu_class",
-      "offers_observed",
-      "cheapest_rentable",
-      "median_price_per_gpu_hour_usd"
-    ],
-    "type": "object"
-  },
-  "type": "array"
-}
    • removedOutput schema / properties / data_delay_note
      Removed value: -{
-  "description": "Free-tier freshness note",
-  "type": "string"
-}
    • addedOutput schema / properties / facilitator
      Added value: +{
+  "description": "x402 facilitator",
+  "type": "string"
+}
    • removedOutput schema / properties / full_depth
      Removed value: -{
-  "description": "Pointer to the paid full-depth route",
-  "type": "string"
-}
    • removedOutput schema / properties / generated_at
      Removed value: -{
-  "description": "ISO-8601 snapshot generation timestamp (whole-market only)",
-  "type": "string"
-}
    • removedOutput schema / properties / gpu
      Removed value: -{
-  "description": "GPU class queried; null for whole-market snapshot",
-  "type": [
-    "string",
-    "null"
-  ]
-}
    • addedOutput schema / properties / how
      Added value: +{
+  "description": "How to pay: GET the paid_url with an x402 v2 PAYMENT-SIGNATURE header carrying the USDC authorization",
+  "type": "string"
+}
    • removedOutput schema / properties / market
      Removed value: -{
-  "description": "Market id, e.g. compute-spot (whole-market only)",
-  "type": "string"
-}
    • addedOutput schema / properties / networks
      Added value: +{
+  "description": "EVM CAIP-2 network ids accepted",
+  "items": {
+    "type": "string"
+  },
+  "type": "array"
+}
    • removedOutput schema / properties / observation_type
      Removed value: -{
-  "description": "ask = live asks, survey = aggregated survey",
-  "type": "string"
-}
    • removedOutput schema / properties / observed_at
      Removed value: -{
-  "description": "ISO-8601 observation timestamp",
-  "type": "string"
-}
    • removedOutput schema / properties / offers
      Removed value: -{
-  "description": "Per-offer asks; stable keys include usd_per_gpu_hr, provider, gpu, kind, observed_at",
-  "items": {
-    "additionalProperties": {},
-    "type": "object"
-  },
-  "type": "array"
-}
    • removedOutput schema / properties / offers_returned
      Removed value: -{
-  "type": "number"
-}
    • addedOutput schema / properties / paid_url
      Added value: +{
+  "description": "x402-paid HTTPS URL to GET (with query params) for the market snapshot",
+  "type": "string"
+}
    • addedOutput schema / properties / payment_required
      Added value: +{
+  "const": true,
+  "description": "Always true: this MCP tool is a payment pointer; the tool itself is monetized via x402.",
+  "type": "boolean"
+}
    • addedOutput schema / properties / price
      Added value: +{
+  "description": "Exact price, e.g. \"$0.25\"",
+  "type": "string"
+}
    • removedOutput schema / properties / provenance
      Removed value: -{
-  "anyOf": [
-    {
-      "type": "string"
-    },
-    {
-      "additionalProperties": {},
-      "type": "object"
-    }
-  ],
-  "description": "Provenance: object for vast-ai, string for aggregated sources"
-}
    • removedOutput schema / properties / source
      Removed value: -{
-  "description": "Upstream source id (aggregated sources only)",
-  "type": "string"
-}
    • removedOutput schema / properties / source_attribution
      Removed value: -{
-  "description": "License/attribution (aggregated sources only)",
-  "type": [
-    "string",
-    "null"
-  ]
-}
    • removedOutput schema / properties / tier
      Removed value: -{
-  "description": "'teaser': free tier is a delayed, capped snapshot",
-  "type": "string"
-}
    • addedOutput schema / properties / tool
      Added value: +{
+  "description": "Tool name: compute_spot_prices",
+  "type": "string"
+}
    • removedOutput schema / properties / type
      Removed value: -{
-  "description": "Pricing mode queried (vast-ai only): ondemand, bid, reserved",
-  "type": "string"
-}
    • addedOutput schema / required
      Added value: +[
+  "payment_required",
+  "tool",
+  "paid_url",
+  "price",
+  "networks",
+  "asset",
+  "facilitator",
+  "how"
+]
  6. Changed4 schema fields changed
    • changedInput schema / properties / max_results / description
      Previous value: -"max offers returned for a single-GPU query (default 10)"New value: +"max offers returned for a single-GPU query (default 5, max 25)"
    • addedOutput schema / properties / data_delay_note
      Added value: +{
+  "description": "Free-tier freshness note",
+  "type": "string"
+}
    • addedOutput schema / properties / full_depth
      Added value: +{
+  "description": "Pointer to the paid full-depth route",
+  "type": "string"
+}
    • addedOutput schema / properties / tier
      Added value: +{
+  "description": "'teaser': free tier is a delayed, capped snapshot",
+  "type": "string"
+}
  7. Changed1 schema field changed
    • changedOutput schema / (root)
      Previous value: -nullNew value: +{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "additionalProperties": false,
+  "properties": {
+    "classes": {
+      "description": "Per-class aggregates (whole-market snapshot only)",
+      "items": {
+        "additionalProperties": false,
+        "properties": {
+          "cheapest_rentable": {
+            "anyOf": [
+              {
+                "additionalProperties": {},
+                "type": "object"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "gpu_class": {
+            "type": "string"
+          },
+          "median_price_per_gpu_hour_usd": {
+            "type": [
+              "number",
+              "null"
+            ]
+          },
+          "offers_observed": {
+            "type": "number"
+          }
+        },
+        "required": [
+          "gpu_class",
+          "offers_observed",
+          "cheapest_rentable",
+          "median_price_per_gpu_hour_usd"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "generated_at": {
+      "description": "ISO-8601 snapshot generation timestamp (whole-market only)",
+      "type": "string"
+    },
+    "gpu": {
+      "description": "GPU class queried; null for whole-market snapshot",
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "market": {
+      "description": "Market id, e.g. compute-spot (whole-market only)",
+      "type": "string"
+    },
+    "observation_type": {
+      "description": "ask = live asks, survey = aggregated survey",
+      "type": "string"
+    },
+    "observed_at": {
+      "description": "ISO-8601 observation timestamp",
+      "type": "string"
+    },
+    "offers": {
+      "description": "Per-offer asks; stable keys include usd_per_gpu_hr, provider, gpu, kind, observed_at",
+      "items": {
+        "additionalProperties": {},
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "offers_returned": {
+      "type": "number"
+    },
+    "provenance": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "additionalProperties": {},
+          "type": "object"
+        }
+      ],
+      "description": "Provenance: object for vast-ai, string for aggregated sources"
+    },
+    "source": {
+      "description": "Upstream source id (aggregated sources only)",
+      "type": "string"
+    },
+    "source_attribution": {
+      "description": "License/attribution (aggregated sources only)",
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "type": {
+      "description": "Pricing mode queried (vast-ai only): ondemand, bid, reserved",
+      "type": "string"
+    }
+  },
+  "type": "object"
+}
  8. Changed1 schema field changed
    • addedInput schema / properties / source
      Added value: +{
+  "description": "Upstream source (default vast-ai)",
+  "enum": [
+    "vast-ai",
+    "gpurentalprices",
+    "price-book"
+  ],
+  "type": "string"
+}
  9. First observed

TDQS

A4.3/5.0
Behavior5/5

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

The description carries behavior the annotations do not: this is a paid call ($0.25 per snapshot, USDC on Base or Arbitrum One), requires an x402 v2 PAYMENT-SIGNATURE header to GET the paid URL, returns a point-in-time snapshot whose listings may already be gone, and explicitly performs no rent/reserve/hold action. With annotations silent on cost and auth, this is exactly the disclosure an agent needs.

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 return semantics, then boundaries, then payment mechanics. Dense and mostly waste-free, though the two payment sentences overlap ('Paid tool — $0.25 per snapshot...' and 'Paid URL: https://...') in a way that could be tightened.

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

Completeness5/5

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 shape, and for a 7-param, zero-required tool it still covers scope, defaults, cost, auth header, and interaction boundaries. Nothing an agent needs to invoke it correctly is missing.

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

Parameters4/5

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

Schema coverage is 100%, so baseline is 3, but the description adds semantics not in the schema: the default for type (ondemand) is unstated in the schema, and 'Omit gpu for the per-class snapshot' tells the agent what a missing filter actually returns. That is genuine value beyond the field descriptions.

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: 'One timestamped snapshot of observed GPU asks,' and sharpens it with 'not quotes — listings may be gone when you rent.' An agent immediately knows this is a read of live GPU price listings. It does not, however, contrast itself with the nearby compute_history / compute_alerts siblings, so differentiation is left implicit.

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

Usage Guidelines4/5

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

Gives real conditional guidance: 'Omit gpu for the per-class snapshot' and 'Default type ondemand; use bid for the interruptible spot auction.' It also draws a firm boundary — 'Observes only; never rents, reserves, or holds.' Missing is any explicit when-to-use-this-vs-a-sibling routing (e.g. vs compute_history), which is the only gap.

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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