How to connect OneSimpleAPI to OpenClaw
Connect OneSimpleAPI to OpenClaw with ClawLink: paste your OneSimpleAPI key once and 15 tools work from chat. No MCP server to run, nothing stored on your machine.
OneSimpleAPIAPI KEYMCPOneSimpleAPI provides utility APIs for web content, images, PDFs, QR codes, URL management, validation, exchange rates, and file management.. Once connected, OpenClaw can read and act on OneSimpleAPI from chat — pairing, token refresh, and tool wiring handled for you.
The usual route to OneSimpleAPI access for OpenClaw is an MCP server you configure and keep running, plus your own OAuth app or API keys. ClawLink gives OpenClaw a more practical OneSimpleAPI setup: install one ClawHub skill, connect OneSimpleAPI in the browser, and OpenClaw can call real OneSimpleAPI actions from any chat surface with no auth, token refresh, or tool wiring to build yourself.
Setup
It takes three steps to connect OpenClaw to OneSimpleAPI.
1Install the plugin
Paste the setup prompt into OpenClaw, or install from the terminal and ask OpenClaw to pair:
openclaw plugins install clawhub:clawlink-plugin- 2
Connect OneSimpleAPI
Paste your API key in the dashboard.
- 3
Use it from chat
Ask OpenClaw: "What can you do with OneSimpleAPI?"
Install by command
The setup prompt above does all of this in one paste. By hand, it is one install command plus a browser approval:
openclaw plugins install clawhub:clawlink-pluginThen ask OpenClaw to set up ClawLink. It starts browser pairing and prints an approval link — open it, approve the device, return to the chat, and say done. Finally, connect OneSimpleAPI in the ClawLink dashboard — paste your OneSimpleAPI API key once.
Verify the connection by asking OpenClaw:
Use OneSimpleAPI to analyze readability and walk me through the result in plain English.
Using a different agent?
The OpenClaw plugin is one client of ClawLink's MCP server. Claude Code, Cursor, Codex, or any agent that can run a shell command pairs with the same ClawLink account through the CLI:
npx -y @useclawlink/cli loginlogin opens the same browser approval and stores a credential locally. Once OneSimpleAPI is connected in the dashboard, that agent calls the same 15 OneSimpleAPI tools over MCP. Full setup for MCP clients and shell agents: connect apps to any AI agent.
OneSimpleAPI MCP for OpenClaw
Looking for a OneSimpleAPI MCP server for OpenClaw? ClawLink connects OneSimpleAPI to OpenClaw and exposes 15 OneSimpleAPI tools your agent can call over MCP, with hosted auth and nothing to run or maintain yourself. Using Hermes instead? The Hermes OneSimpleAPI integration works the same way.
What the OpenClaw OneSimpleAPI integration can do
15 OneSimpleAPI tools are ready for OpenClaw once the account is connected. The 14 below are the ones people reach for most; your agent can call all 15.
14 of 15 OneSimpleAPI tools for OpenClaw
| Tool | What it does |
|---|---|
Analyze readability onesimpleapi_analyze_readability | Analyze text for readability, grade level, reading time, difficult-word counts, and sentiment |
Calculate ppp discount onesimpleapi_calculate_ppp_discount | Calculate a purchasing-power-parity discount and localized price between an origin and a |
Convert currency onesimpleapi_convert_currency | Convert an amount between supported currencies and return the converted value and exchange rate |
Expand short URL onesimpleapi_expand_short_url | Resolve a shortened URL and return its final URL, redirect count, and redirect trace |
Generate or convert color onesimpleapi_generate_or_convert_color | Generate a deterministic color palette from text or convert a supplied color into HEX, RGB |
Get image information onesimpleapi_get_image_information | Extract dimensions, image metadata, EXIF camera fields, and available GPS details from an image |
List files onesimpleapi_list_files | Return one page of generated files owned by the connected account, optionally filtered by live |
List short URLS onesimpleapi_list_short_urls | Return one page of OneSimpleAPI short URLs and their click statistics |
Validate email onesimpleapi_validate_email | Validate an email address and assess its domain, MX records, deliverability, disposability |
Capture screenshot onesimpleapi_capture_screenshot | Capture a webpage URL or raw HTML as a hosted screenshot and return its URL and rendering |
Create short URL onesimpleapi_create_short_url | Create a OneSimpleAPI short URL with optional one-time-use, redirect, query-forwarding, and |
Generate PDF onesimpleapi_generate_pdf | Generate a PDF from either a webpage URL or raw HTML and return the hosted PDF URL and page |
Generate qr code onesimpleapi_generate_qr_code | Generate a hosted PNG or SVG QR code for a message and return its URL |
Transform image onesimpleapi_transform_image | Resize, crop, rotate, flip, filter, border, optimize, and host an image, returning the |
Try it: find the OneSimpleAPI tool you need
Browse the 14 OneSimpleAPI tools
Click any tool to see exactly what OpenClaw can do and copy a ready-to-use prompt.
Example prompts
Use OneSimpleAPI to analyze readability and walk me through the result in plain English.
Use OneSimpleAPI to calculate ppp discount and walk me through the result in plain English.
Use OneSimpleAPI to convert currency and walk me through the result in plain English.
Use OneSimpleAPI to expand short url and walk me through the result in plain English.
ClawLink vs. building it yourself
The alternative to ClawLink is usually manual API key setup plus your own token handling, permission troubleshooting, and tool plumbing for OpenClaw. That is fine if you want to build and maintain the integration yourself. Most teams just want OneSimpleAPI working from chat.
| Manual | ClawLink | |
|---|---|---|
| Credential handling | Collect, validate, store, and rotate the OneSimpleAPI API key yourself, then make sure every tool call uses the right account. | Users complete the hosted ClawLink setup once and the connected OneSimpleAPI account becomes available to the agent without you building credential management. |
| Ongoing maintenance | You own refresh logic, permission debugging, environment config, and every provider-specific edge case for OneSimpleAPI. | ClawLink handles the repetitive integration plumbing so your team can focus on the workflow instead of the infrastructure. |
| Agent usability | You still need to expose the right OneSimpleAPI actions to the runtime in a format your agent can reliably use. | 15 tools for OneSimpleAPI are already exposed through ClawLink, so the agent can read and act from chat immediately. |
ClawLink vs. Composio
Composio also exposes OneSimpleAPI to AI agents. It is developer infrastructure: Python and TypeScript SDKs, an MCP server, and a catalog past 1,000 apps, aimed at teams shipping agent products. ClawLink is built for OpenClaw users instead. You install the plugin once, connect OneSimpleAPI in the browser, and the 15 tools above work from chat. There is no SDK and no config file, and the OneSimpleAPI key you paste at setup is stored server-side rather than kept in your environment. Choosing between them? Read the full Composio alternatives comparison.
Troubleshooting
OpenClaw installed the OneSimpleAPI skill but can't call the tools
The ClawHub skill teaches OpenClaw about OneSimpleAPI, but the calls run through the ClawLink plugin and your connected account. Make sure OneSimpleAPI is connected in the dashboard, then start a fresh chat so OpenClaw reloads the tool catalog. If OpenClaw runs as a persistent gateway, restart it so the new tools register.
Connection succeeds but no tools appear
Reconnect OneSimpleAPI from the dashboard, then start a fresh chat if the runtime still has the old tool catalog loaded.
"Tool schema not loaded yet" error when calling OneSimpleAPI tools
OneSimpleAPI tool schemas load on demand the first time a tool runs and are cached after that, so this error usually clears on its own: wait a few seconds and retry the same request. If every OneSimpleAPI call keeps failing with it in a fresh chat, reconnect from the dashboard, and contact support if it still persists — that pattern points to a configuration problem on our side, not something you can fix by reconnecting again.
OneSimpleAPI returns 403 or "permission denied" on one action while others work
Two usual causes. The connected account may not have access to the specific workspace, inbox, store, or project in the request — check that first. If access looks right, the agent may have sent a placeholder value (like "YOUR_ID" or an example id from documentation) instead of a real one: ask it to run a list or search tool first, then retry the action with a real id from those results. Most failures at this stage are one of these two, not ClawLink bugs.
API key setup works but results look incomplete
Double-check that the API key for OneSimpleAPI has the right scopes or account access. A valid key can still be too limited for some reads or writes.
FAQ
Is there a OpenClaw OneSimpleAPI integration?
Yes. ClawLink is the fastest way to connect OpenClaw to OneSimpleAPI: link your OneSimpleAPI account once in the browser and OpenClaw can call the OneSimpleAPI API through 15 ready-made tools — no custom code or token handling.
How do I add OneSimpleAPI to OpenClaw with ClawLink?
Paste the setup prompt from this page into OpenClaw. It installs the ClawLink OneSimpleAPI skill from ClawHub, then you click Connect in the dashboard to authorize OneSimpleAPI. OpenClaw calls the tools from the next message — no config files, and the OneSimpleAPI key you paste is stored server-side instead of in your environment.
How long does it take to connect OneSimpleAPI to OpenClaw?
About two minutes. Sign in, click Connect next to OneSimpleAPI in the dashboard, authenticate, and OpenClaw can use it from the next chat message.
Why use ClawLink instead of wiring OneSimpleAPI up myself?
The alternative to ClawLink is usually manual API key setup plus your own token handling, permission troubleshooting, and tool plumbing for OpenClaw. That is fine if you want to build and maintain the integration yourself. Most teams just want OneSimpleAPI working from chat.
OpenClaw installed the OneSimpleAPI skill but can't call the tools
The ClawHub skill teaches OpenClaw about OneSimpleAPI, but the calls run through the ClawLink plugin and your connected account. Make sure OneSimpleAPI is connected in the dashboard, then start a fresh chat so OpenClaw reloads the tool catalog. If OpenClaw runs as a persistent gateway, restart it so the new tools register.
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