PostBin

· #271 most-used

Ephemeral HTTP endpoints for testing webhooks and API clients

ProductivityDeveloperSecurityAutomationMonitoring & Alerts

PostBin is a free developer tool that creates temporary HTTP endpoints — called bins — for capturing and inspecting incoming HTTP requests. Each bin has a unique URL that records every request sent to it: method, headers, query parameters, and full body. Connect it to Actionist and your agents can create bins on demand, fire test payloads, retrieve and assert captured requests, process them sequentially, and clean up after themselves — turning PostBin into a programmable webhook testing layer for your CI pipelines, integration smoke tests, customer bug reproductions, and compliance verifications.

Average time saved
5 hours
per person · per month
≈ 1 workdays back

Eliminates manual work. Agents eliminate the repetitive cycle of manually creating PostBin bins, firing test payloads, inspecting captured requests, and cleaning up — tasks that happen dozens of times per week across engineering, support, and operations.

Schedule

What your PostBin agent runs on autopilot

A week of scheduled jobs your Actionist agent will execute on your behalf.

28Scheduled jobs
7Agents at work
24/7Always on
Agents
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Multi-app workflows

PostBin × every other app you use

End-to-end automations that span multiple apps — each one a real business outcome.

6Workflows
5Apps spanned
~17 hrsSaved / week
4Personas served
For engineering
Featured2 apps

Automated webhook schema check on every pull request

When a pull request opens against the main branch, the agent creates a PostBin bin, fires a representative test payload, retrieves and validates the captured request against the expected schema, and posts the result as a PR check comment — all within about a minute. Broken webhook payloads are caught at review time rather than discovered by a customer reporting a missing field.

~5 hrs

Time saved for your team — every week, on autopilot

The flow
Trigger·When a new pull request is opened against the main branch in GitHub
Result
Create a fresh PostBin bin for this PR's webhook testsSend test payload simulating the integration's expected webhook eventPost webhook validation result as a PR check commentDelete the test bin after assertions complete
The win
Saved per run
20 min
Runs / week
~15×
Webhook schema regressions caught in code review, not production
Driven byOperations Agent
ROI

Savings

What your team gets back — two angles: what you stop doing manually, and what that's worth.

Without Actionist

What you do manually today

With Actionist

What your agent runs for you

  • Sales
    30 min / week
    Manual demo webhook check

    Sales engineers manually open PostBin, create a bin, fire a test, inspect the result, and delete the bin before each prospect demo — 10 minutes per check, often skipped under time pressure.

    Sales Agent
    0 min
    Agent validates demo webhooks before every call

    Before the week's prospect calls, the agent creates a PostBin bin, fires the demo webhook, and confirms the payload is correct — demo environments are always verified, never embarrassingly broken on a live call.

  • Marketing
    30 min / week
    Manual campaign webhook verification

    The marketing ops team manually tests each webhook before a campaign launch, pasting test payloads into PostBin by hand and checking the result — adding 15 minutes to every launch checklist.

    Marketing Agent
    0 min
    Agent validates campaign webhooks before launch

    Before each campaign launch, the marketing agent fires a test payload at PostBin and confirms the automation webhook is delivering the correct contact fields — campaign goes live with a verified integration.

  • Customer Support
    60 min / week
    Manual webhook bug reproduction

    Support agents manually attempt to reproduce webhook bugs by hand, often unable to simulate the exact payload — leading to back-and-forth with customers asking them to retrigger the event.

    Customer Support Agent
    0 min
    Agent captures reproduction payloads from customer bug reports

    When a webhook bug is reported, the support agent creates a PostBin bin, fires the reproduction payload, and attaches the captured request to the bug report — engineering has real data in minutes.

  • Human Resources
    20 min / week
    Manual HRIS webhook field check

    HR ops manually tests HRIS webhooks by hand before each new-hire cohort — creating a PostBin bin, sending a test event, inspecting the result — or skips the check and discovers missing fields after a new hire's automation fails.

    Human Resources Agent
    0 min
    Agent verifies HRIS webhooks before each new-hire week

    Every Monday morning, the HR agent validates the HRIS new-hire webhook payload, confirming all required onboarding fields are present before the week's automations run.

  • Finance
    25 min / week
    Manual payment webhook inspection

    Finance ops manually fires test payment events and inspects the PostBin result before each billing cycle — or relies on live events and discovers missing fields only when a revenue entry fails.

    Finance Agent
    0 min
    Agent validates payment webhook fields before revenue runs

    Every Monday, the finance agent captures a test payment webhook in PostBin and confirms all revenue-recognition fields are present before billing automations process the week's events.

  • Operations
    45 min / week
    Manual weekly integration health check

    Operations manually tests each monitored webhook by hand every Monday morning, creating and deleting bins one at a time — a process that takes 45 minutes and is often deprioritized when other Monday tasks are urgent.

    Operations Agent
    0 min
    Agent runs a scheduled webhook health sweep every Monday

    Every Monday at 07:30, the operations agent creates PostBin bins for all monitored integrations, fires test payloads, and checks delivery — all integration health statuses are in Google Sheets before the business day starts.

  • Legal
    15 min / week
    Manual compliance webhook sign-off

    Legal manually requests a test payload from engineering, inspects it by hand in PostBin, and documents the result in a spreadsheet — a process that takes a day per integration and is easily skipped under deadline pressure.

    Legal Agent
    0 min
    Agent verifies compliance webhook signatures before production

    When a new compliance-critical webhook integration is registered, the legal agent captures a test payload in PostBin and verifies both the HMAC signature header and all required compliance fields before the integration goes live.

+ 100s of other PostBin automations
Average time saved
23 hrs / person / month
Calculator

Calculate what your team saves

Team size
5 people
Hourly rate
$75 / hr
Hours saved / week
6
Hours saved / year
300
Annual ROI
$22,500

Based on PostBin's typical team usage — the visible tasks plus a few other automations the agent runs: ~1.2 hrs / person / week of admin work automated.

Connect

How to plug PostBin into Actionist

Pick the connection method that suits your environment.

PostBin's public API requires no authentication. Actionist connects directly to the PostBin endpoint — no account, no API key, no OAuth flow needed.

1
No credentials needed

PostBin's public API does not require authentication. Actionist connects to https://www.toptal.com/developers/postbin/api directly. No API key or account is needed to create bins, send requests, or retrieve captured payloads.

2
Connect in Actionist

Find PostBin in the Apps tab and click Connect. Actionist will run a test bin creation to confirm the connection is healthy.

3
Start testing webhooks

Your agents can now create bins, send test payloads, retrieve captured requests, and delete bins programmatically.

Credentials you'll need
API Key
PostBin does not require authentication for public bins — leave this empty or enter any value to proceed.
Actions

12 actions your agent can call

Read and write operations available to your Actionist agent.

Triggers

0 events your agent can react to

Events your agent watches for, and the actions it kicks off in response.

This app has no triggers yet.
FAQs

Questions about PostBin + Actionist

How does Actionist connect to PostBin?
Open the Apps tab, find PostBin, and click Connect. PostBin does not use OAuth or API keys — every bin is publicly accessible via its binId. Actionist connects to PostBin's public API (https://www.toptal.com/developers/postbin/api) directly, so no credential setup is required. The agent can create bins, send test requests, retrieve captured requests, and clean up bins without any authentication step on your end.
How long does a PostBin bin last before it expires?
PostBin bins are temporary by design — each bin expires 30 minutes after its last request is received. This makes PostBin ideal for short-lived test sessions (CI runs, webhook smoke tests, API integration checks) rather than persistent logging. If you need to keep request data beyond 30 minutes, your Actionist agent should extract and store the captured request payloads into a more durable destination — Google Sheets, Notion, or your database — before the bin expires.
Can I use PostBin for automated testing in a CI/CD pipeline?
Yes. The most common pattern is: (1) the agent creates a fresh bin before a test run, (2) fires the test payload at the bin URL using Send Request, (3) retrieves the captured request with Get Request, (4) asserts the payload matches the expected shape, and (5) deletes the bin. This gives you a programmable, ephemeral endpoint for each test run — no shared state, no leftover bins, and a clean audit trail. It works equally well for webhook smoke tests, API client validation, and CI pipeline checks.
What parts of an HTTP request does PostBin capture?
PostBin captures the full HTTP request: method (GET, POST, PUT, PATCH, DELETE, etc.), headers (including Content-Type and Authorization), query parameters, and the complete request body — raw, JSON, or form data. You retrieve this via the Get Request action. The captured payload is exactly what the sending system transmitted, making it reliable for diagnosing malformed payloads, missing headers, or incorrect content types from third-party services.
What is the 'Remove First' request action and when should I use it?
PostBin's Remove First Request action pops the oldest request off the bin's queue. This is useful when you want to process captured requests one at a time — your agent calls Remove First, processes the payload (logs it, validates it, forwards it), then calls Remove First again for the next one. This is the correct pattern for sequential assertion in integration tests where order matters. If you just want to read without removing, use Get Request instead.
Can I use Actionist to simulate webhook payloads against a PostBin bin?
Yes. Using the Send Request action, your Actionist agent can fire any HTTP method with any headers and body at a PostBin endpoint — effectively simulating what a real third-party service (a payment gateway, a SaaS platform, a CI server) would send. This lets you test your webhook handler logic without needing the real external service to fire. For example, you can simulate a Stripe payment.succeeded webhook by sending a realistic JSON payload to a bin and verifying your handler processes it correctly.
How do I keep PostBin bins clean between test runs?
Create a fresh bin at the start of each test run and delete it at the end using the Delete Bin action. This ensures each test run gets a clean, isolated endpoint with no leftover requests from previous runs. Since bins expire automatically after 30 minutes of inactivity anyway, deleting is a hygiene step for runs that finish early. Stale bins that accumulate don't cause functional problems, but explicit cleanup keeps your test logs unambiguous — you always know exactly which bin belongs to which run.
Is PostBin at toptal.com/developers/postbin the same as postb.in?
PostBin is available at two domains: https://www.toptal.com/developers/postbin/ (the Toptal-hosted instance) and https://postb.in/ (the canonical domain). Both run the same service. Actionist's PostBin integration targets the Toptal endpoint by default. The API surface is identical across both — bin creation, request retrieval, and deletion all work the same way on either domain. If your team has a self-hosted PostBin instance, you would need to point the agent's base URL at that host instead.