Fiat + crypto · REST & WebSocket

The interbank mid-market rate, in under a second.

Sync-Convert serves timestamped fiat and crypto exchange rates through one API. Every response tells you exactly how old it is, so you can prove your pricing was right at the moment you quoted it.

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Demo keys are reviewed by a human. No credit card.

Live rate

Fresh

From

4,731.2

Rate: 47.3120
Age: 0 ms
Source: sample

Showing sample rates — the rate engine is not connected in this environment.

One request. One honest answer.

Most rate APIs hand you a number with no provenance. Ours returns the age of the tick, the tier it came from, and whether the feed had degraded to a fallback — so a stale rate is a condition you can branch on rather than a bug you discover in production.

as_ofUTC epoch milliseconds of the tick itself
age_mshow long ago that tick was captured
source_tierlicensed_ws, exchange_ws, ecb_reference, or manual
staletrue when every live source is unavailable

GET /v1/rates/latest?base=EUR&symbols=USD,TRY

{
  "success": true,
  "base": "EUR",
  "rates": { "USD": 1.0842, "TRY": 47.3120 },
  "as_of": 1755950412338,
  "age_ms": 412,
  "source_tier": "licensed_ws",
  "stale": false,
  "meta": { "credits_used": 1, "credits_remaining": 29873 }
}

Built for people who get paged

Verifiable freshness

Every response carries as_of, age_ms and source_tier. Freshness is something you can assert in a test, not something we claim in marketing copy.

Fiat and crypto, one contract

EUR, USD, TRY, MAD, GBP and CHF alongside BTC, ETH, USDT and USDC — same endpoints, same envelope, same credit accounting.

Outlier rejection built in

Ticks that drift more than 2% from the ECB daily reference are rejected and alerted before they ever reach your application.

Credits, not raw calls

A daily rate lookup costs 1 credit; a multi-year timeseries costs 10. You pay for the work you actually ask for.

WebSocket push on Pro and up

Subscribe to the pairs you enabled and receive ticks as they land. No polling loop, no wasted quota.

Your pricing never changes under you

No forced upgrades. Existing tenants keep the terms they signed up on, permanently.

Flat pricing, no forced upgrades

Freshness is not a paywall — one cached feed serves every tenant, so even Starter gets 60-second rates. You pay for volume, streaming and history depth.

Demo

Reviewed by hand. Tell us what you're building.

Free

Freshness: 60 s
Credits: 1Kcapped
WebSocket: —
Active domains: 1
History: 7 days

1,000 credits, hard-capped
Fiat + base crypto rates
No credit card required
Expires after 30 days

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Starter

For a single product with predictable conversion volume.

$99/ month

Freshness: 60 s
Credits: 30K
WebSocket: —
Active domains: 3
History: 90 days

30,000 credits / month
Fiat + crypto rates
90 days of history
Email support

Choose Starter

Growth

Pro

WebSocket push for live pricing surfaces.

$365/ month

Freshness: 1 s
Credits: 150K
WebSocket: Yes
Active domains: 10
History: 5 years

150,000 credits / month
1-second rate freshness
WebSocket streaming
5 years of history

Choose Pro

Business

Tick-level push at platform scale.

$699/ month

Freshness: tick
Credits: 2M
WebSocket: Yes
Active domains: 25
History: 10 years

2,000,000 credits / month
Tick-level push
WebSocket streaming
10 years of history

Choose Business

Enterprise

Annual only. Contractual uptime and your own liquidity source.

Custom

Freshness: tick
Credits: Unlimited
WebSocket: Yes
Active domains: Unlimited
History: Full

Unlimited credits
99.9% uptime SLA with service credits
Bring your own liquidity source
Dedicated support channel

Talk to us

Overage is billed per call credit at $0.0005 beyond your quota. The Demo plan is hard-capped and never incurs overage. Active domains limit where a key may be used from a browser — subdomains are unlimited and server-to-server calls are never restricted.

Tell us what you're building.

Demo keys are approved by hand, usually within a business day. 1,000 credits, no card, no sales call.

Request a demo key