Fetch & parse a domain's ads.txt
API · /adstxt-api
ads.txt API
healthy
4,867 Subscribers
Fetch and evaluate any publisher's ads.txt / app-ads.txt — the IAB authorized-digital-sellers standard. Pass a domain and the check endpoint fetches its ads.txt server-side, then returns every seller record parsed into its fields — advertising system, the publisher's seller/account id, the DIRECT or RESELLER relationship and the optional certification-authority id (TAG-ID) — alongside counts (direct, reseller, distinct ad systems) and the declared variables OWNERDOMAIN, MANAGERDOMAIN, CONTACT and SUBDOMAINS. The verify endpoint answers the one question programmatic-advertising integrations actually ask: is this advertising system, with this publisher id, authorized to sell this domain's inventory? — returning an authorized boolean and the matching records. A missing file is reported as found:false (not an error), and soft-404 HTML pages are detected and rejected so you never parse a "page not found" as records. The request is made server-side and private or internal targets are refused (SSRF-guarded). Built for ad-tech supply-chain verification, SSP/DSP onboarding checks, anti-fraud and inventory audits. An ads.txt seller-authorization checker — distinct from the security-contact file reader (securitytxt), the robots.txt crawlability evaluator (robots) and the sitemap parser (sitemap). No upstream key, no cache.
api.oanor.com/adstxt-api
API health
healthy- Uptime
- 100.00%
- Server probes · 24h
- Avg latency
- 155 ms
- Server probes · 24h
- Subscribers
- 4,867
- active
- Total calls
- 57
- last 7 days
Pricing
Pick a tier — billed monthly, cancel anytime.
Free
Free
- 2,090 calls / month
- 2 requests / second
- Hard cap (429 above quota, no overage)
- 2,090 calls/month
- 2 req/sec
- Check + verify
- No credit card
Starter
€6.15 /month
- 40,000 calls / month
- 8 requests / second
- Hard cap (429 above quota, no overage)
- 40k calls/month
- 8 req/sec
- Full record + variable parsing
- Email support
Pro
€20.25 /month
- 212,000 calls / month
- 20 requests / second
- Hard cap (429 above quota, no overage)
- 212k calls/month
- 20 req/sec
- Supply-chain verification pipelines
- Priority support
Mega
€52.60 /month
- 808,000 calls / month
- 50 requests / second
- Hard cap (429 above quota, no overage)
- 808k calls/month
- 50 req/sec
- Ad-tech platform scale
- Dedicated SLA
Built by
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api.oanor.com/marketing-api
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api.oanor.com/admetrics-api
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api.oanor.com/cookie-api
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api.oanor.com/httpstatus-api
Frequently asked questions
Quick answers about pricing, quotas, and integration.
How do I get an API key for ads.txt API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call ads.txt API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for ads.txt API?
Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.
How much does ads.txt API cost?
ads.txt API has a free tier with 100 calls / month. Paid plans start at €6.15 / month with higher quotas and faster rate limits.
Can I cancel my subscription anytime?
Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.
Is ads.txt API GDPR-compliant?
All requests to ads.txt API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.
Pick an endpoint from the list on the left to see its details and try it.
Code snippets
Sign up to get an API key, then call any path under your slug.
curl https://api.oanor.com/adstxt-api/SOME_PATH \
-H "x-oanor-key: oanor_test_..."const res = await fetch("https://api.oanor.com/adstxt-api/SOME_PATH", {
headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();$ch = curl_init("https://api.oanor.com/adstxt-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);import requests
r = requests.get(
"https://api.oanor.com/adstxt-api/SOME_PATH",
headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())Ratings
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