Slack, GitHub, Kalshi, PayPal, Lob, Okta, Linear, Stripe, Resendon localhost.

stateful

Every call sees the ones before it. Add a customer, list your customers and they are there. Remove the customer and they are gone.

1. 1

   POST /v1/customers name="Ada Lovelace"

   name: "Ada Lovelace"— added

2. 2

   GET /v1/customers

   data: [{ name: "Ada Lovelace" }]— there in the list

3. 3

   DELETE /v1/customers/cus_…llc

   deleted: true— removed

4. 4

   GET /v1/customers

   data: []— gone from the list

verified

Before every release, the same requests go to the live API and to the simulator. This is how often they agree.

• Slack96.7%

  539 probes

• GitHub94.7%

  621 probes

• Kalshi91.7%

  361 probes

• PayPal98.2%

  110 probes

• Lob100.0%

  32 probes

• Okta98.6%

  217 probes

• Linear100.0%

  110 probes

• Resend100.0%

  64 probes

local

Your laptop or a CI runner, with no rate limits. Free and Pro need an account and a network connection for billing; Enterprise runs offline.