List models, per-role runtime defaults, and the system default fallback chain

Selectable models + the code-default model each runtime role falls back to.

The role defaults mirror the runtime constants (single-sourced via src.runtime.model_defaults.ROLE_DEFAULTS, which imports the SAME constants the runtime applies) so the UI can show what’s actually used — model + effort + max_tokens + temperature + thinking budget — when an entity leaves a setting unset. Imported lazily inside the handler: model_router deliberately never imports src.runtime at module scope (the runtime imports model_router.service — a top-level import here risks a cycle).

GET

model-router

catalog

List models, per-role runtime defaults, and the system default fallback chain

curl --request GET \
  --url https://api-sandbox.featherhq.com/v1/model-router/catalog \
  --header 'x-api-key: <api-key>'

const options = {method: 'GET', headers: {'x-api-key': '<api-key>'}};

fetch('https://api-sandbox.featherhq.com/v1/model-router/catalog', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api-sandbox.featherhq.com/v1/model-router/catalog",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "GET",
  CURLOPT_HTTPHEADER => [
    "x-api-key: <api-key>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"net/http"
	"io"
)

func main() {

	url := "https://api-sandbox.featherhq.com/v1/model-router/catalog"

	req, _ := http.NewRequest("GET", url, nil)

	req.Header.Add("x-api-key", "<api-key>")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

require 'uri'
require 'net/http'

url = URI("https://api-sandbox.featherhq.com/v1/model-router/catalog")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Get.new(url)
request["x-api-key"] = '<api-key>'

response = http.request(request)
puts response.read_body

{
  "models": [
    {
      "model_identifier": "<string>",
      "provider": "<string>",
      "supports_streaming": true,
      "max_context_window": 123,
      "input_price_per_1m": 123,
      "output_price_per_1m": 123,
      "supports_tools": true,
      "supports_vision": false,
      "regions": [
        "<string>"
      ],
      "family": "default",
      "supports_json_schema": true,
      "supports_reasoning_effort": false,
      "allowed_efforts": [
        "<string>"
      ],
      "fastest_effort": "<string>",
      "supports_temperature": true,
      "supports_thinking": false,
      "supports_thinking_budget": false,
      "supports_audio": false,
      "compliance_tags": [
        "<string>"
      ]
    }
  ],
  "role_defaults": [
    {
      "role": "<string>",
      "model": "<string>",
      "reasoning_effort": "<string>",
      "max_tokens": 123,
      "temperature": 123,
      "thinking_budget": 123
    }
  ],
  "default_chain": [
    {
      "model": "<string>",
      "config": {
        "temperature": 1,
        "max_tokens": 2,
        "top_p": 0.5,
        "stop_sequences": [
          "<string>"
        ],
        "reasoning_effort": "none",
        "request_timeout_ms": 10500,
        "thinking_budget": 2
      }
    }
  ]
}

{
  "error": "<string>",
  "message": "<string>",
  "retryable": true,
  "retry_after": 123
}

{
  "error": "<string>",
  "message": "<string>",
  "retryable": true,
  "retry_after": 123
}

Authorizations

x-api-key

string

header

required

Response

Successful Response

Selectable models, per-role code defaults, and the system default fallback chain.

default_chain is the platform-level fallback chain (a hardcoded constant from src.model_router.defaults) used when no org-level default router config exists. It is read-only — there is no API to mutate it.

models

AvailableModel · object[]

required

Show child attributes

role_defaults

RoleModelDefault · object[]

required

Show child attributes

default_chain

ModelChainEntry · object[]

required

Show child attributes

List models, per-role runtime defaults, and the system default fallback chain

curl --request GET \
  --url https://api-sandbox.featherhq.com/v1/model-router/catalog \
  --header 'x-api-key: <api-key>'

const options = {method: 'GET', headers: {'x-api-key': '<api-key>'}};

fetch('https://api-sandbox.featherhq.com/v1/model-router/catalog', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api-sandbox.featherhq.com/v1/model-router/catalog",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "GET",
  CURLOPT_HTTPHEADER => [
    "x-api-key: <api-key>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"net/http"
	"io"
)

func main() {

	url := "https://api-sandbox.featherhq.com/v1/model-router/catalog"

	req, _ := http.NewRequest("GET", url, nil)

	req.Header.Add("x-api-key", "<api-key>")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

require 'uri'
require 'net/http'

url = URI("https://api-sandbox.featherhq.com/v1/model-router/catalog")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Get.new(url)
request["x-api-key"] = '<api-key>'

response = http.request(request)
puts response.read_body

{
  "models": [
    {
      "model_identifier": "<string>",
      "provider": "<string>",
      "supports_streaming": true,
      "max_context_window": 123,
      "input_price_per_1m": 123,
      "output_price_per_1m": 123,
      "supports_tools": true,
      "supports_vision": false,
      "regions": [
        "<string>"
      ],
      "family": "default",
      "supports_json_schema": true,
      "supports_reasoning_effort": false,
      "allowed_efforts": [
        "<string>"
      ],
      "fastest_effort": "<string>",
      "supports_temperature": true,
      "supports_thinking": false,
      "supports_thinking_budget": false,
      "supports_audio": false,
      "compliance_tags": [
        "<string>"
      ]
    }
  ],
  "role_defaults": [
    {
      "role": "<string>",
      "model": "<string>",
      "reasoning_effort": "<string>",
      "max_tokens": 123,
      "temperature": 123,
      "thinking_budget": 123
    }
  ],
  "default_chain": [
    {
      "model": "<string>",
      "config": {
        "temperature": 1,
        "max_tokens": 2,
        "top_p": 0.5,
        "stop_sequences": [
          "<string>"
        ],
        "reasoning_effort": "none",
        "request_timeout_ms": 10500,
        "thinking_budget": 2
      }
    }
  ]
}

{
  "error": "<string>",
  "message": "<string>",
  "retryable": true,
  "retry_after": 123
}

{
  "error": "<string>",
  "message": "<string>",
  "retryable": true,
  "retry_after": 123
}