fetchsandbox — APIs that run

Stateful API sandboxes from any OpenAPI spec. Test Stripe, Paddle, Clerk, Shopify, and 45 more without touching production.

[fetchsandbox — APIs that run @fetchsandbox]

most API integrations break after the first request

webhooks, retries, async flows, staging drift…

so we built an MCP server for FetchSandbox.

Cursor/Claude can now explore + run real API workflows directly from your IDE.

raw demo below ↓

this flow:
- explores Stripe APIs
- runs the workflow
- chains IDs across steps
- triggers webhooks
- verifies the integration end-to-end

without setting up local infra or fake mocks.

looking for early feedback from engineers building with APIs

[fetchsandbox — APIs that run @fetchsandbox]

Your coding agent writes the integration in minutes. Then a retried webhook charges a customer twice.

FetchSandbox MCP runs the real API lifecycle from your IDE — retries, webhooks, state — and hands back a receipt, not a claim.

65 APIs. No keys. https://t.co/qAVHKwjIgK

[fetchsandbox — APIs that run @fetchsandbox]

@i_mika_el @unfiltered_ajit @ProductHunt @rnagulapalle thanks man!!

[fetchsandbox — APIs that run @fetchsandbox]

@JustJerry121 @rnagulapalle Thank you ..that’s what i kept hearing from devs too. the decision isn’t made during the architecture slides, it’s made when they’re staring at the config file and wondering if it’ll work 😅

[fetchsandbox — APIs that run @fetchsandbox]

@0xHarsh @aditiitwt thanks man!!

[fetchsandbox — APIs that run @fetchsandbox]

@nicklaunches Yeah maybe your client and server might using localhost that’s my guess

[fetchsandbox — APIs that run @fetchsandbox]

most API integrations break after the first request

webhooks, retries, async flows, staging drift…

so we built an MCP server for FetchSandbox.

Cursor/Claude can now explore + run real API workflows directly from your IDE.

raw demo below ↓

this flow:
- explores Stripe APIs
- runs the workflow
- chains IDs across steps
- triggers webhooks
- verifies the integration end-to-end

without setting up local infra or fake mocks.

looking for early feedback from engineers building with APIs

[fetchsandbox — APIs that run @fetchsandbox]

@nicklaunches u need to fix something this on backend.. maybe u need api-server->front-end

[fetchsandbox — APIs that run @fetchsandbox]

@sebuzdugan @aditiitwt thanks Sebastian.. really appreciate kind words.. i am happy to help if u need anything and honestly any feedback is appreciated..

[fetchsandbox — APIs that run @fetchsandbox]

@Aditi96261 @aditiitwt Yup that’s correct

[fetchsandbox — APIs that run @fetchsandbox]

thanks sooraj. that’s actually a different approach.

mock servers replay API responses from the spec. we build an API behavior graph from specs, docs, examples, workflows, webhooks, dependencies and curated signals.

the spec is just the seed. the graph is what lets agents navigate multi-step integrations safely, understand state transitions, and produce realistic outputs instead of just returning mocked responses.

[fetchsandbox — APIs that run @fetchsandbox]

@Ryan_liberricky @aditiitwt yup!! thats the real goal ... as dev we dont need to swtich contenxt and just let the agents know navigatable graph .. they handle with human in the loop

[fetchsandbox — APIs that run @fetchsandbox]

@proxy_vector @aditiitwt 100% ..well said man!!

[fetchsandbox — APIs that run @fetchsandbox]

@0xHarsh @aditiitwt hey Harsh.. we tested around compliex workflows like Stripe + Clerk + Resend.. but feel free to share your exp/pain.. we will give a try.. and happy to connect with you to learn more

[fetchsandbox — APIs that run @fetchsandbox]

@Taniyatweets_ @aditiitwt yeah.. i used to spend hours with developers at Payments company few years back.. and it used to takes daya/weeks for them to go live. now with FetchSandbox typical integrattions takes around 15 mins

[fetchsandbox — APIs that run @fetchsandbox]

@ravikiran_dev7 @aditiitwt thanks Ray.. currently the complex nature of the can be handled pretty well by the backend FetchSandbox graphs.. we just onboarded around 10+ specs onto MCP now... please give a try n let us know..

[fetchsandbox — APIs that run @fetchsandbox]

@StevenACZ @nyrabuilds looks intresting and clean landing page man!! all the best

[fetchsandbox — APIs that run @fetchsandbox]

@StevenACZ @nyrabuilds Yup 100% I see that you are building fin app n wondering what APIs are you working with .. curious

[fetchsandbox — APIs that run @fetchsandbox]

thanks Steven.. appreciate that.. i have seen the developers pain for long time while working at Payments company.. and even in agentic space.. the integrations are broken. So we are building a graph so the agents can navigate better for building integrations with less friction/less token cost.. we have done some bunch results with n without fetchsandbox mcp using claude/cursor.. our mcp graphs beat by 20-30% margin of less token and less time..

happy to connect and please try one of the integrations using claude/cursor .. the steps are here https://t.co/mIz9BTc6th

i sent follow request..

[fetchsandbox — APIs that run @fetchsandbox]

@openclawcoder @X hey shola..lets connect ...

[fetchsandbox — APIs that run @fetchsandbox]

@nyrabuilds congrats Nyra and lets connect. I see you are full-stack developer and wondering what are you working these days? do you work with API integrations?

[fetchsandbox — APIs that run @fetchsandbox]

@aibekjumabek we're building FetchSandbox, an MCP that lets devs connect, run, and ship api integrations right from their agentic IDE. giving a free claude/cursor subscription for a month to people who try it out and share honest feedback, would love to know what you think.