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by io.chainhelix
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candles

Requires a ChainHelix API key as bearer token, or 2 cents per call paid over Binance b402 in USDT, USDC, USD1 or U on BNB Smart Chain, or over x402 in USDC on the Base network. Price history: open, high, low, close, volume and trade count per candle for one chain, any of fourteen timeframes from one minute to one week, up to 500 candles newest last

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
chainYes
limitNo
timeframeNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
metaNo
chainYes
countNo
sourceNo
candlesYes
receiptNo
latestAtNo
timeframeYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changed
    • changedInput schema / x-lexicon / bundleSha256
      Previous value: -"a1c2e10fd3177d6b4d59ca78693e8fb36880165cf0f735f680dd86a510411178"New value: +"e5b4290024a229f2bdf97f8fc6a0079c3fe13b77267f41fdcffeb8b26aa1c41e"
  2. Changed1 schema field changed
    • changedInput schema / x-lexicon / bundleSha256
      Previous value: -"1eeb782ee15fe69fc80776948e0556fa6b795e210e6305935b2c97b73d955cda"New value: +"a1c2e10fd3177d6b4d59ca78693e8fb36880165cf0f735f680dd86a510411178"
  3. Changed1 schema field changed
    • changedInput schema / x-lexicon / bundleSha256
      Previous value: -"c014292cad7497ce9fd68c33345ac32cb42b672c8e77d6c749c26e162cc207e4"New value: +"1eeb782ee15fe69fc80776948e0556fa6b795e210e6305935b2c97b73d955cda"
  4. Changed3 schema fields changed
    • addedInput schema / x-aliases
      Added value: +{
+  "limit": [
+    "Limit",
+    "limits",
+    "$limit",
+    "_limit",
+    "Limits"
+  ]
+}
    • addedInput schema / x-lexicon
      Added value: +{
+  "bundleSha256": "c014292cad7497ce9fd68c33345ac32cb42b672c8e77d6c749c26e162cc207e4",
+  "name": "ChainHelix Agentic Lexicon",
+  "resolve": "lexicon_resolve",
+  "spec": "lexicon_spec",
+  "version": "0.1.0"
+}
    • addedInput schema / x-vocab
      Added value: +{
+  "chain": "onchain.chain",
+  "limit": "data.limit",
+  "timeframe": "market.timeframeApi"
+}
  5. Changed4 schema fields changed
    • addedOutput schema / properties / latestAt
      Added value: +{
+  "type": [
+    "number",
+    "null"
+  ]
+}
    • addedOutput schema / properties / meta
      Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "contentHash": {
+      "type": "string"
+    },
+    "generated": {
+      "type": "number"
+    },
+    "priceUsd": {
+      "type": "number"
+    },
+    "validUntil": {
+      "type": "number"
+    }
+  },
+  "type": "object"
+}
    • addedOutput schema / properties / receipt
      Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "bytes": {
+      "type": "number"
+    },
+    "covers": {
+      "type": "string"
+    },
+    "issuedAt": {
+      "type": "number"
+    },
+    "lookup": {
+      "type": "string"
+    },
+    "network": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "nonce": {
+      "type": "string"
+    },
+    "seq": {
+      "type": "number"
+    },
+    "settleTx": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "sha256": {
+      "type": "string"
+    },
+    "tool": {
+      "type": [
+        "string",
+        "null"
+      ]
+    }
+  },
+  "type": "object"
+}
    • addedOutput schema / properties / source
      Added value: +{
+  "type": "string"
+}
  6. Added

TDQS

A3.8/5.0
Behavior4/5

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

With no annotations, the description carries the behavioral burden and does well: it discloses authentication/payment requirements, single-chain scope, fourteen timeframes, a 500-candle cap, and 'newest last' ordering. It omits error/rate-limit behavior, but the output schema covers return structure.

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?

The description is a single dense sentence with no fluff, front-loading the critical auth/payment requirement before the data behavior. It could be split into readable sentences, but every detail earns its place.

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?

Given the output schema exists and annotations are absent, the description covers the essential invocation context: required auth/payment, data scope, timeframe choices, limit, and ordering. It does not discuss alternatives or failure modes, preventing a 5, but it is sufficient for correct use.

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 0%, so parameter meaning must come from the description. It adds value by explaining 'one chain', fourteen timeframes from one minute to one week, and up to 500 candles, which maps directly to chain, timeframe, and limit. Exact enum values remain in the schema, so it does not need to repeat them.

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?

The description clearly identifies the resource: price history with open, high, low, close, volume, and trade count per candle for a single chain. It lacks an explicit verb like 'get' or 'fetch' and does not name alternatives, but the meaning is unambiguous.

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?

The description states important usage prerequisites: a ChainHelix API key as bearer token or a per-call payment via b402/x402. It does not explicitly say when to choose this tool over siblings like 'prices', but the phrase 'price history' implies its use case.

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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