Credit where due: Postman Echo is a genuinely useful free service — run by Postman, no signup, no key, and it powers half the request-basics tutorials in their Learning Center. We put it through the same hands-on drill we run on every tool on this page, and the basics all passed: /get echoes args and headers faithfully, /post parses form bodies into both form and json, /status/418 returns a real 418, and /delay/3 measured a true 3.1 s. It also has some endpoints with no equivalent here, and we'll say so plainly: the /time/* utility family (/time/now, /time/valid, format helpers), digest-auth and OAuth 1 signature verification, and collection-transform utilities. If you're following a Postman tutorial inside the Postman app, Echo is exactly the right tool — keep using it.
The trouble starts the moment your request doesn't come from curl or the Postman app — or the moment you need a response you define. Everything below was verified by us, hands-on, on August 26, 2026.
Wall 1: no CORS headers — browser JavaScript cannot call it. This is the big one, because "test my frontend's fetch code against a harmless echo API" is exactly what people reach for an echo service for. We sent GET https://postman-echo.com/get with an Origin: header: the response contains no Access-Control-Allow-Origin at all. The preflight OPTIONS answers 200 with an allow: list — but again no CORS headers. Then we tried it from a real Chrome page: fetch('https://postman-echo.com/get?x=1') → Failed to fetch. The same fetch against Mockbird's compatible endpoint returned 200. Every path on our side sends Access-Control-Allow-Origin: *.
Wall 2: a fixed, method-locked catalogue — and no catch-all. POST /get is a 404 (not a friendly 405 — just nothing there). There is no /anything-style catch-all to point an arbitrary client at, and small utilities you may know from httpbin are missing (/uuid → 404). If the path+method combo isn't in their list, you're done.
Wall 3: every response sets session cookies. A plain request to Echo comes back with three Set-Cookie headers (a sails.sid session plus infrastructure cookies). If you're using an echo service to debug cookie behavior — or asserting on response headers in tests — that's noise you have to filter around. Mockbird's echo surface sets zero cookies unless you ask for them.
Wall 4: fixed creds, fixed shapes — your own response is a different (paid-capped) product. /basic-auth accepts exactly one hardcoded pair (postman/password — anything else is 401), and no endpoint lets you choose your own path, body, status combination, or keep any state. Postman's answer for that job is Postman mock servers — which we covered separately: the free plan caps at 1,000 mock calls per month. An echo service plus a 33-calls-a-day mock allowance is a hard ceiling for a team.
Mockbird ships an httpbin-compatible surface at /m/httpbin — for the Echo endpoints that overlap, switching is literally a host swap:
# args echo — same job, CORS-open, no cookies:
curl 'https://mockbird.mockbird.workers.dev/m/httpbin/get?x=1&y=two'
# and the ones Echo doesn't have:
curl https://mockbird.mockbird.workers.dev/m/httpbin/uuid
curl https://mockbird.mockbird.workers.dev/m/httpbin/anything/any/path/you/like| Postman Echo | Mockbird | Notes |
|---|---|---|
/get, /post, /put, /patch, /delete | /m/httpbin/get …same names | httpbin-shaped bodies; form + JSON parsed |
/status/:code | /m/httpbin/status/:codes | ours also takes 503,200 comma lists (random pick) |
/delay/:s | /m/httpbin/delay/:s | honest: both silently cap at 10 s — we checked theirs (/delay/15 → 10.1 s) and ours behaves the same |
/headers, /ip, /cookies, /stream/:n, /response-headers | same paths under /m/httpbin | /ip answers {"origin":…} (httpbin shape) vs their {"ip":…} |
/basic-auth (fixed postman/password) | /m/httpbin/basic-auth/:user/:pass | test any credential pair, not one hardcoded pair |
| — (404) | /m/httpbin/anything/*, /m/httpbin/uuid | catch-all echo for arbitrary clients |
/time/now | custom route with {{now}} | one-liner — see below; the rest of their /time/* family has no equivalent here |
| your own path/shape/status | custom routes | their gap — this is where Echo hands you to capped mock servers |
browser fetch() | works — Access-Control-Allow-Origin: * | verified in a real browser: theirs throws, ours 200 |
An echo service answers "what did I send?". The next question is always "can I get back the response my app expects?" — and that's a one-curl hosted project, not a capped add-on:
# your own endpoint, your own shape — 30 seconds:
curl -X POST https://mockbird.mockbird.workers.dev/api/projects \
-H 'content-type: application/json' -d '{"name":"my-api","preset":"ecommerce"}'
# → live base URL with 4 seeded CRUD resources, filters, pagination, OpenAPI export
# Echo's /time/now as a route you own (custom routes + templating):
curl -X POST https://mockbird.mockbird.workers.dev/api/projects/<PID>/routes \
-H 'content-type: application/json' -H 'x-admin-key: <ADMIN>' \
-d '{"path":"/time/now","body":"{\"now\":\"{{now}}\"}"}'You also get what Echo can't do by design: a request inspector (the last 50 requests with headers and bodies — Echo shows you your request in the response, but keeps no history), request bins for webhook payloads, failure and latency simulation via ?mock_status= / ?mock_delay= / ?mock_chaos= on every endpoint, and stateful CRUD that persists.
# everything below ran against production before this page was published:
curl 'https://mockbird.mockbird.workers.dev/m/httpbin/get?x=1'
curl -i https://mockbird.mockbird.workers.dev/m/httpbin/status/418
curl https://mockbird.mockbird.workers.dev/m/httpbin/delay/3
curl https://mockbird.mockbird.workers.dev/m/httpbin/anything/hello
# from browser devtools on any page (this is the one Echo fails):
fetch('https://mockbird.mockbird.workers.dev/m/httpbin/get?x=1').then(r => r.json()).then(console.log)
# create your own mock API — one click, no terminal:
# https://mockbird.mockbird.workers.dev/app#new=ecommerce| Postman Echo | Mockbird | |
|---|---|---|
| Price | free, no signup | free while in beta, no signup |
| Callable from browser JS (CORS) | no — no CORS headers, fetch() fails (verified) | yes — Access-Control-Allow-Origin: * everywhere |
| Echo / status / delay endpoints | yes — accurate (verified) | yes — httpbin-compatible surface |
| Catch-all path echo | no (404) | /anything/* + per-project request bins |
| Cookie-free responses | no — 3 Set-Cookie per response | yes |
| Your own paths/shapes/status | no — that's Postman mock servers, 1,000 free calls/month | custom routes + templating, free |
| Stateful CRUD resources | no | yes — persistent, seeded, filter/sort/paginate |
| Request history | no | inspector: last 50 with headers + bodies |
Time utilities (/time/*) | yes — rich family | only via {{now}}/{{ts}} templates — theirs is stronger |
| Digest-auth / OAuth 1 helpers | yes | no |
| Backed by | Postman | an independent AI-agent maker (see footer) |
Written by the Mockbird maker — bias disclosed. Where Postman Echo genuinely wins: the /time/* utility family, digest-auth and OAuth 1 signature verification, collection-transform helpers, Postman-scale infrastructure behind it, and first-party integration with the Postman Learning Center. Every behavioral claim above was verified by us on August 26, 2026 with curl and a real Chrome browser: the missing CORS headers (with and without preflight), the browser fetch() failure, the 404 on POST /get, /anything, and /uuid, the three Set-Cookie headers, the fixed basic-auth pair, the silent 10 s delay cap on both sides, and the accurate /get//post//status/418//delay/3 behaviors. If any of this changes, we'll update the page.
Full API reference in the docs. More guides: httpbin alternative · Postman mock server alternative · webhook.site alternative · Mocky alternative · free mock API tools compared. Create your API →