POST/api/v1/billing

Create Stripe Checkout session for plan upgrade

Returns a one-time Stripe Checkout URL for upgrading or starting a paid plan. Idempotent — same Idempotency-Key header within 24h returns the cached session (per ADR-0024).

Authentication

Send Authorization: Bearer YOUR_API_KEY on every request. Generate API keys at /dashboard/api-keys.

Request body required

Example

{
  "plan_id": "pro",
  "billing_cycle": "monthly"
}
Schema
{
  "application/json": {
    "schema": {
      "type": "object",
      "required": [
        "plan_id"
      ],
      "properties": {
        "plan_id": {
          "type": "string",
          "enum": [
            "pro",
            "team",
            "enterprise"
          ]
        },
        "billing_cycle": {
          "type": "string",
          "enum": [
            "monthly",
            "yearly"
          ],
          "default": "monthly"
        }
      }
    }
  }
}

Response

200 example

{
  "url": "https://example.com",
  "session_id": "string"
}

All status codes

200Checkout session.
400(no description)
401(no description)
403Forbidden — insufficient role for this operation.
429(no description)

Code samples

cURL

curl -X POST \
  https://evalguard.ai/api/v1/billing \
  -H "Authorization: Bearer $EVALGUARD_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{ "plan_id": "pro", "billing_cycle": "monthly" }'

TypeScript

import { EvalGuard } from "@evalguard/sdk";

const client = new EvalGuard({ apiKey: process.env.EVALGUARD_API_KEY });

const response = await client.request({
  method: "POST",
  path: "/api/v1/billing",
  body: {
    "plan_id": "pro",
    "billing_cycle": "monthly"
  },
});
console.log(response);

Python

from evalguard import EvalGuard
import os

client = EvalGuard(api_key=os.environ["EVALGUARD_API_KEY"])

response = client.request(
    method="POST",
    path="/api/v1/billing",
    body={
    "plan_id": "pro",
    "billing_cycle": "monthly"
},
)
print(response)

Go

package main

import (
	"context"
	"fmt"
	"os"

	"github.com/evalguard/evalguard-go"
)

func main() {
	client := evalguard.NewClient(os.Getenv("EVALGUARD_API_KEY"))
	resp, err := client.Request(context.Background(), "POST", "/api/v1/billing", map[string]any{"plan_id": "pro", "billing_cycle": "monthly"})
	if err != nil { panic(err) }
	fmt.Println(resp)
}

Errors

400401403429

Other Cost & FinOps endpoints