Compute the check digit
API · /securitiesid-api
Securities ID API
healthy
3,710 Subscribers
Validate the world's securities identifiers and compute their check digits — entirely locally. The validate endpoint checks an ISIN (the 12-character International Securities Identification Number), a CUSIP (the 9-character North-American identifier) or a SEDOL (the 7-character UK/Ireland identifier), auto-detecting which one you passed, and verifies it with the correct algorithm for each: the Luhn-over-letter-expansion scheme for ISIN, the doubling mod-10 scheme for CUSIP and the weighted mod-10 scheme for SEDOL. It returns whether the identifier is valid, the parsed parts (for an ISIN, the two-letter country prefix and the nine-character national number) and the expected check digit so you can see exactly why something failed. The checkdigit endpoint computes the trailing check digit for an identifier body, so you can complete or generate a valid code. Everything runs locally and deterministically, so it is instant and private — no market-data lookups, no third-party calls. Ideal for fintech and trading systems, reference-data and securities-master pipelines, reconciliation, data validation and import tooling, and compliance checks. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This validates an identifier's structure and check digit; it does not look up the underlying security or its market data.
api.oanor.com/securitiesid-api
API health
healthy- Uptime
- 100.00%
- Server probes · 24h
- Avg latency
- 196 ms
- Server probes · 24h
- Subscribers
- 3,710
- active
- Total calls
- 66
- last 7 days
Pricing
Pick a tier — billed monthly, cancel anytime.
Free
Free
- 2,435 calls / month
- 2 requests / second
- Hard cap (429 above quota, no overage)
- 2,435 calls/month
- 2 req/sec
- ISIN + CUSIP + SEDOL
- No credit card
Starter
€3.95 /month
- 11,950 calls / month
- 8 requests / second
- Hard cap (429 above quota, no overage)
- 11.95k calls/month
- 8 req/sec
- Validate + check-digit
- Email support
Pro
€23.85 /month
- 170,500 calls / month
- 20 requests / second
- Hard cap (429 above quota, no overage)
- 170.5k calls/month
- 20 req/sec
- Securities-master / reconciliation pipelines
- Priority support
Mega
€61.85 /month
- 895,000 calls / month
- 50 requests / second
- Hard cap (429 above quota, no overage)
- 895k calls/month
- 50 req/sec
- Platform scale
- Dedicated SLA
Built by
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Live risk-of-ruin and drawdown-survival analytics that traders run to size risk so a losing streak cannot wipe them out, computed on demand from the edge you pass in — no key, no cache, nothing stored. The ruin endpoint returns the probability of ever losing your capital given a win rate, a reward-to-risk payoff and the risk taken per trade, solved analytically from the gambler's-ruin equation rather than simulated — it also reports the expectancy in R, the capital units at risk and the single-unit ruin root behind the answer. The drawdown endpoint returns the probability of ever hitting each of several drawdown levels and the gain needed to recover from them. The recovery endpoint returns the loss-and-gain asymmetry — the percent gain required to climb back from any drawdown, the reason a 50 percent loss needs a 100 percent gain — and, if you pass net profit and max drawdown, the recovery factor. This is an analytic risk engine, fundamentally different from Monte-Carlo simulators and price-series drawdown feeds: it turns a win rate, payoff and risk fraction into the closed-form math of survival, instantly. Win rate accepts a fraction or a percentage; payoff is reward-to-risk; negative expectancy makes ruin certain. Computed locally and deterministically, so it is instant and private. Ideal for position sizing, money-management rules, prop-firm risk limits and trading dashboards. Live, nothing stored. 3 compute endpoints. For a full Monte-Carlo outcome distribution use a strategy-simulator API.
api.oanor.com/riskofruin-api
Frequently asked questions
Quick answers about pricing, quotas, and integration.
How do I get an API key for Securities ID API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Securities ID API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Securities ID 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 Securities ID API cost?
Securities ID API has a free tier with 100 calls / month. Paid plans start at €3.95 / 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 Securities ID API GDPR-compliant?
All requests to Securities ID 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/securitiesid-api/SOME_PATH \
-H "x-oanor-key: oanor_test_..."const res = await fetch("https://api.oanor.com/securitiesid-api/SOME_PATH", {
headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();$ch = curl_init("https://api.oanor.com/securitiesid-api/SOME_PATH");
curl_setopt($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/securitiesid-api/SOME_PATH",
headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())Ratings
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