GhostKey — Route Paid APIs with x402

Ghostkey Quote

ghostkey_quote

Read-onlyIdempotent

Return pre-spend guidance for a named capability, with charged=false and payment_is_delivery=false. Use to locate the canonical paid execution authority and request its fresh 402 quote. This response is guidance, not an executable price quote or settlement receipt.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`capability`	No	Capability name or identifier for which caller wants canonical paid-route quote guidance.

Output Schema

TableJSON Schema

Name	Required	Description	Default
`charged`	Yes
`authority`	Yes
`capability`	Yes
`quote_status`	Yes
`paid_execution`	Yes
`payment_is_delivery`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed2 schema fields changedOct 13, 2026

addedInput schema / properties / capability / description

Added value: +"Capability name or identifier for which caller wants canonical paid-route quote guidance."

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "additionalProperties": true,
+  "properties": {
+    "authority": {
+      "type": "string"
+    },
+    "capability": {
+      "type": "string"
+    },
+    "charged": {
+      "const": false
+    },
+    "paid_execution": {
+      "type": "string"
+    },
+    "payment_is_delivery": {
+      "const": false
+    },
+    "quote_status": {
+      "const": "free_pre_spend_guidance"
+    }
+  },
+  "required": [
+    "capability",
+    "quote_status",
+    "charged",
+    "authority",
+    "paid_execution",
+    "payment_is_delivery"
+  ],
+  "type": "object"
+}

Changed1 schema field changedSep 5, 2026
- removedInput schema / $schema
```
Removed value: -"http://json-schema.org/draft-07/schema#"
```
First observedSep 2, 2026

TDQS

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