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cfw-autumn/apps/docs/mintlify/api-reference/balances/trackTokens.mdx
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---
title: "Track Token Usage"
openapi: "openapi POST /v1/balances.track_tokens"
---
import { DynamicParamField } from "/snippets/dynamic-param-field.jsx";
import { DynamicResponseField } from "/snippets/dynamic-response-field.jsx";
import { DynamicResponseExample } from "/snippets/dynamic-response-example.jsx";
<Note>
Track AI token usage against a customer's AI credit system balance. Converts token counts to a dollar cost using [Models.dev](https://models.dev) pricing and your configured markup, then deducts from the customer's credit balance.
</Note>
The `model_id` must use `provider/model` format, matching the provider and model keys from [Models.dev](https://models.dev). For providers with nested model paths (like OpenRouter), include the full path: `openrouter/anthropic/claude-opus-4.6`. The first path segment is the provider key used for provider-level markup lookup.
### Common Use Cases
<CodeGroup>
```typescript Anthropic
await autumn.balances.trackTokens({
customerId: "cus_123",
modelId: "anthropic/claude-opus-4-6",
inputTokens: 1000,
outputTokens: 500
});
```
```typescript With cache + reasoning
await autumn.balances.trackTokens({
customerId: "cus_123",
modelId: "anthropic/claude-opus-4-6",
inputTokens: 800, // excludes the cached tokens below
outputTokens: 350, // excludes the reasoning tokens below
cacheReadTokens: 1000,
cacheWriteTokens: 200,
reasoningTokens: 150
});
```
```typescript OpenRouter (nested path)
await autumn.balances.trackTokens({
customerId: "cus_123",
modelId: "openrouter/anthropic/claude-opus-4.6",
inputTokens: 2000,
outputTokens: 1000
});
```
```typescript With explicit feature
await autumn.balances.trackTokens({
customerId: "cus_123",
featureId: "ai_credits",
modelId: "anthropic/claude-haiku-4-5",
inputTokens: 2000,
outputTokens: 1000
});
```
</CodeGroup>
### Token Pools
Each token parameter is an exclusive pool — no token should be counted in more than one. Each pool is billed at the model's published rate for that pool, falling back to the text input/output rate when the model has none.
<Warning>
If you pass a provider's raw totals (e.g. OpenAI's `prompt_tokens` and `completion_tokens`), subtract the cache and reasoning counts first — otherwise those tokens are billed twice. The [`@useautumn/ai-sdk` wrapper](/documentation/external-providers/ai-sdk) does this normalization for you.
</Warning>
### Markup Resolution
Markups are optional — the credit system's default markup applies unless overridden per provider or per model. With no markups set, the Models.dev base cost is charged as-is. A markup of `-100` makes the model free — the usage event is still recorded, but nothing is deducted. See [AI Credit Systems](/documentation/modelling-pricing/credit-systems#ai-credit-systems) for configuration.
<Tip>
`feature_id` is auto-detected when the customer has exactly one AI credit system. The request fails if the customer has none, or has more than one and `feature_id` is omitted.
</Tip>
### Body Parameters
<DynamicParamField body="customer_id" type="string" required>
The ID of the customer.
</DynamicParamField>
<DynamicParamField body="model_id" type="string" required>
The AI model in `provider/model` format, matching keys from [Models.dev](https://models.dev) (e.g., `anthropic/claude-opus-4-6`, `openai/gpt-4o`, `openrouter/anthropic/claude-opus-4.6`).
</DynamicParamField>
<DynamicParamField body="input_tokens" type="number" required>
Number of non-cached text input tokens consumed. Exclusive of the cache and audio token pools.
</DynamicParamField>
<DynamicParamField body="output_tokens" type="number" required>
Number of text output tokens consumed. Exclusive of the reasoning and audio output pools.
</DynamicParamField>
<DynamicParamField body="cache_read_tokens" type="number">
Number of cached input tokens read, billed at the model's cache read rate.
</DynamicParamField>
<DynamicParamField body="cache_write_tokens" type="number">
Number of input tokens written to the cache, billed at the model's cache write rate.
</DynamicParamField>
<DynamicParamField body="reasoning_tokens" type="number">
Number of reasoning tokens generated, billed at the model's reasoning rate (falls back to the output rate).
</DynamicParamField>
<DynamicParamField body="audio_input_tokens" type="number">
Number of audio input tokens consumed, billed at the model's audio input rate (falls back to the input rate).
</DynamicParamField>
<DynamicParamField body="audio_output_tokens" type="number">
Number of audio output tokens generated, billed at the model's audio output rate (falls back to the output rate).
</DynamicParamField>
<DynamicParamField body="feature_id" type="string">
The ID of the AI credit system feature. If omitted, automatically detects the customer's AI credit system feature. Required when the customer has more than one.
</DynamicParamField>
<DynamicParamField body="entity_id" type="string">
The ID of the entity for entity-scoped balances.
</DynamicParamField>
<DynamicParamField body="properties" type="object">
Additional properties to attach to this usage event. The token counts and a pricing breakdown (`cost`, `base_cost`, `markup`, `markup_source`, `tier_applied`, `rates`) are automatically included.
</DynamicParamField>
### Response
<DynamicResponseField name="customer_id" type="string">
The ID of the customer whose token usage was tracked.
</DynamicResponseField>
<DynamicResponseField name="value" type="number">
The dollar cost that was deducted from the customer's AI credit balance.
</DynamicResponseField>
<DynamicResponseField name="balance" type="object | null">
The updated balance for the AI credit system feature.
<Expandable title="properties">
<DynamicResponseField name="feature_id" type="string">
The feature ID this balance is for.
</DynamicResponseField>
<DynamicResponseField name="granted" type="number">
Total balance granted (included + prepaid).
</DynamicResponseField>
<DynamicResponseField name="remaining" type="number">
Remaining balance available for use.
</DynamicResponseField>
<DynamicResponseField name="usage" type="number">
Total usage consumed in the current period.
</DynamicResponseField>
<DynamicResponseField name="unlimited" type="boolean">
Whether this feature has unlimited usage.
</DynamicResponseField>
<DynamicResponseField name="overage_allowed" type="boolean">
Whether usage beyond the granted balance is allowed.
</DynamicResponseField>
<DynamicResponseField name="next_reset_at" type="number | null">
Timestamp when the balance will reset, or null for no reset.
</DynamicResponseField>
</Expandable>
</DynamicResponseField>
<ResponseExample>
```json 200
{
"customer_id": "cus_123",
"value": 0.06,
"balance": {
"feature_id": "ai_credits",
"granted": 10.00,
"remaining": 9.94,
"usage": 0.06,
"unlimited": false,
"overage_allowed": false,
"next_reset_at": 1773851121437,
"breakdown": [
{
"id": "cus_ent_abc123",
"plan_id": "pro_plan",
"included_grant": 10.00,
"prepaid_grant": 0,
"remaining": 9.94,
"usage": 0.06,
"unlimited": false,
"reset": {
"interval": "month",
"resets_at": 1773851121437
},
"price": null,
"expires_at": null
}
]
}
}
```
</ResponseExample>