How to fund an open-source project with sponsorships
README, docs and release sponsorship for maintainers: what developer attention is worth, how to price it, and how to take money without changing the project.
Open-source projects reach the audience that is hardest to advertise to anywhere else. Developers block ads, distrust marketing and choose tools on the strength of documentation and peer use - so a sponsor placement inside a project they already depend on is one of the very few channels that actually lands.
Maintainers routinely undersell this. Download counts and documentation traffic are real audience numbers, and infrastructure and tooling companies have budget specifically allocated to reaching exactly these people. The gap between what maintainers ask for and what sponsors would pay is usually large.
How it works for an open-source project
- The README is the placement
- A sponsor block near the top of a README that thousands of engineers read while evaluating tools is the most valuable inventory an open-source project has.
- Docs sites carry real traffic
- Documentation often gets far more sustained visits than the repository itself, and it reaches people mid-implementation - a better moment than mid-evaluation.
- Sponsorship is not endorsement unless you say so
- Keep the line clear. A labelled sponsor block is uncontroversial; a dependency added because someone paid is not, and the community will find out.
What you can actually sell
- README sponsor blocks and logo placements
- Documentation site banners and sponsored guides
- Release-note and changelog mentions
- Tiered sponsorship packages spanning the repo, docs and site
What to charge
Developer Tools benchmarks apply, with documentation traffic as your visitor figure. README placements on widely-depended-on projects justify the top of the range, because the sponsor is reaching engineers at the moment they choose a stack.
| If your subject is | Benchmark CPM | Flat rate at 10K | |
|---|---|---|---|
| Developer Tools | $8.00 | $180 / spot / month | Full rates |
| Tech & SaaS | $8.00 | $180 / spot / month | Full rates |
| AI & Machine Learning | $10.00 | $225 / spot / month | Full rates |
| Productivity | $4.50 | $100 / spot / month | Full rates |
Benchmarks for a site at 10,000 monthly visitors with 2 ad spots. Run your own numbers to adjust for your traffic.
What these placements sell for on Adsly
Live prices from listings currently offering the formats above.
| Format | Listed spots | From | Median | Up to |
|---|---|---|---|---|
| Package Deal | 16 | $30 | $729 | $99,000 |
| Banner Ad | 15 | $3 | $50 | $499 |
| Logo Placement | 7 | $9 | $100 | $1,499 |
What to have ready before you pitch
Nearly every sponsor asks for the same handful of things. Having them written down turns a two-week email thread into one message.
- 1 Package downloads per month and documentation traffic - quote both honestly
- 2 Stars, dependents and any notable companies using the project
- 3 Who your users are: hobbyists, or engineers at companies with budget
- 4 A public sponsorship policy, so nobody has to guess what money buys
Platforms like yours on Adsly
Worth a look for how other owners describe their audience and structure their offer.
SiteBleed
Tech & SaaS
SiteBleed monitors your websites 24/7, alerts you the moment they go down, and shows exactly how much revenue you're losing — in real time.
Dialaxy
Tech & SaaS
Advanced Cloud Telephony Platform for Your Business
Going Rate
Tech & SaaS
Free branded cost calculators for your website. Give visitors an instant price estimate, and capture their details as a qualified lead.
RedLinz
Developer Tools
RedLinz turns marked-up screenshots into structured, AI-ready prompts — so Cursor, Claude, ChatGPT & Perplexity know exactly what to change.
Clearcote
Developer Tools
Open-source stealth Chromium — drop-in for Playwright & Puppeteer.
Printer Monitoring - Managed Print Services - MPS Monitor
Tech & SaaS
MPS Monitor offers comprehensive remote management and monitoring of printers and multi-function devices, helping businesses improve efficiency and reduce costs.
Questions about monetizing an open-source project
Is it acceptable to put sponsors in a README?
It is now standard practice across widely-used projects, provided the block is clearly labelled and separate from the technical content. What draws objections is sponsorship that influences the code, not sponsorship that funds it.
What numbers should a maintainer quote?
Monthly package downloads and documentation traffic, and be plain about which is which. Stars are a vanity number that experienced sponsors discount immediately.
How is this different from GitHub Sponsors?
GitHub Sponsors is donation-shaped and depends on goodwill. Selling a placement is a commercial transaction with a defined deliverable, so it tends to be worth considerably more, and it renews on a schedule.
Does Adsly take a commission on sponsorship deals?
No. Adsly charges nothing on the deals you close - you agree terms directly with the sponsor and keep 100% of what they pay. The business model is listing fees, and publishing is free if you run the Adsly badge on your site.
Do I need to set prices before listing?
No. Plenty of listings go live with no priced opportunities at all - the listing itself is a profile brands can find. You can add opportunities with your own prices later, whenever you have decided what to charge.
Run something else too?
Let sponsors come to you
List an open-source project on Adsly and brands browsing for your kind of audience can find and message you directly. Free to publish with the Adsly badge, 0% commission on every deal, and you add priced opportunities whenever you are ready.
List an open-source project