API · /across-api

Across Bridge API

healthy 4,810 Subscribers

Live cross-chain bridge data from Across, one of the largest intent-based bridges, which moves USDC, ETH, WBTC and other assets between Ethereum and its rollups (Arbitrum, Base, Optimism, Polygon, zkSync, Linea, Blast, Scroll and more) using a relayer network and a single unified liquidity pool. The quote endpoint prices a bridge transfer — the relayer capital fee, gas fee, LP fee, total fee, the amount received and the estimated fill time. The routes endpoint lists every supported bridge route (origin chain, destination chain, token). The limits endpoint returns the min and max bridgeable amount for a route. The chains endpoint lists supported chains. Read live from Across, nothing stored. This is Across's own cross-chain bridge fee, route and fill-time layer — distinct from DEX, lending, staking and price feeds.

#across #bridge #cross-chain #defi #rollups #interop #ethereum #crypto

api.oanor.com/across-api

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Machine-readable spec so AI agents can integrate this API.

/api/across-api/openapi.json

/api/across-api/llms.txt

Discovery: GET /api/index.json lists every API.

API health

healthy

Uptime: 100.00%; Server probes · 24h
Avg latency: 190 ms; Server probes · 24h
Subscribers: 4,810; active
Total calls: 5; last 7 days

Full status page → · 10 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

2,400 calls / month
3 requests / second
Hard cap (429 above quota, no overage)
2.4k calls/month
3 req/sec
All routes
No credit card

Starter

€9.50 /month

62,000 calls / month
15 requests / second
Hard cap (429 above quota, no overage)
62k calls/month
15 req/sec
Email support

Pro

€27.50 /month

330,000 calls / month
40 requests / second
Hard cap (429 above quota, no overage)
330k calls/month
40 req/sec
Priority support

Scale

€63.00 /month

2,050,000 calls / month
120 requests / second
Hard cap (429 above quota, no overage)
2.05M calls/month
120 req/sec
Dedicated SLA

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PremiumApi

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Wheatstone Bridge API

Wheatstone-bridge and strain-gauge maths as an API, computed locally and deterministically. The bridge endpoint takes the four arm resistances R1–R4 and an excitation voltage and returns the bridge output voltage between the two midpoints, Vout = Vin·(R2/(R1+R2) − R4/(R3+R4)), in volts and millivolts, the voltage at each midpoint, and whether the bridge is balanced (Vout = 0 when R1·R4 = R2·R3). The balance endpoint inverts it: give any three arms and it solves the fourth resistance that balances the bridge, the classic way a Wheatstone bridge measures an unknown resistance. The strain endpoint models a strain-gauge bridge — quarter, half or full — and converts in both directions between mechanical strain and electrical output: from a gauge factor and a strain (given directly, as microstrain or as a relative resistance change ΔR/R = GF·ε) it returns the output ratio and voltage Vout/Vin = (k/4)·GF·ε where k is the number of active arms, and from an output voltage and excitation it returns the strain and microstrain. Everything is computed locally and deterministically, so it is instant and private. Ideal for instrumentation and sensor tools, load-cell, pressure-sensor and RTD measurement design, strain-gauge and data-acquisition apps, and electronics education. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is bridge and strain-gauge measurement; for Ohm's law, voltage dividers and series/parallel resistor combinations use an Ohm's-law API.

api.oanor.com/wheatstone-api

THORChain Cross-Chain Liquidity API

Live cross-chain liquidity data from THORChain — the decentralised cross-chain automated market maker (AMM) that swaps native assets (BTC, ETH, BCH, AVAX and more) across separate blockchains without wrapping or bridging, settling every trade through its native RUNE asset and continuous liquidity pools. Read straight from a public THORNode REST endpoint as clean JSON. List every liquidity pool with its RUNE and asset depth, RUNE price and USD price, pool units and status; pull one pool's full depth and pricing; read the protocol's economics — total bonded RUNE, effective security bond, reserve and bonding / liquidity APY; get the current inbound vault address, router and gas rate for every connected chain plus halt flags; or read the last observed and signed block height per connected chain, THORChain's cross-chain heartbeat. Live, no cache. This is THORChain's cross-chain AMM, liquidity-pool and vault layer — distinct from single-chain explorers and from price feeds: continuous liquidity pools settled in RUNE.

api.oanor.com/thorchain-api

KyberSwap API

Live DEX-aggregator swap quotes from KyberSwap, which routes a trade across every decentralised exchange and liquidity pool on a chain to find the best output. The quote endpoint prices a swap between two tokens on Ethereum, Arbitrum, Base, Optimism, Polygon or BNB Chain — it returns the amount received, the USD values in and out, the price impact, the estimated gas cost and the DEXs the route passes through. The tokens endpoint lists the supported tokens per chain. The chains endpoint lists supported chains. Read live from KyberSwap, nothing stored. This is KyberSwap's own multi-chain EVM swap-routing and best-price layer — distinct from single-DEX feeds and from Solana swap aggregators.

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STON.fi API

Live data from STON.fi, the largest decentralised exchange on TON (The Open Network, the Telegram-native blockchain). The overview endpoint returns the DEX's current total value locked plus lifetime volume, wallets and trades. The pools endpoint returns the top liquidity pools by volume, APY or liquidity — each with its token pair, last price, base/quote volume and liquidity, LP token USD price and APY. The assets endpoint searches STON.fi's token registry by symbol and returns each token's live USD price, decimals and contract address. Read live from STON.fi, nothing stored. The only TON-native DeFi feed here — distinct from Ethereum, Solana and Sui DEX feeds — this is STON.fi's own TON DEX pool, volume/APY and token-pricing layer.

api.oanor.com/stonfi-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Across Bridge API?

Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Across Bridge API with the x-oanor-key header. No credit card needed for the free tier.

What's the rate limit for Across Bridge 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 Across Bridge API cost?

Across Bridge API has a free tier with 100 calls / month. Paid plans start at €9.50 / 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 Across Bridge API GDPR-compliant?

All requests to Across Bridge 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.

Quote 1

Routes 1

Limits 1

Chains 1

Meta 1

Pick an endpoint from the list on the left to see its details and try it.

GET /v1/quote

Price a bridge transfer — fees, output, fill time

Playground

Parameters

Custom headers

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GET /v1/routes

Supported bridge routes

Playground

Parameters

Custom headers

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GET /v1/limits

Min/max bridgeable amount for a route

Playground

Parameters

Custom headers

Language: Client:

GET /v1/chains

All supported chains

Playground

Custom headers

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GET /v1/meta

Service metadata

Playground

Custom headers

Language: Client:

Code snippets

curl https://api.oanor.com/across-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."

const res = await fetch("https://api.oanor.com/across-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();

$ch = curl_init("https://api.oanor.com/across-api/SOME_PATH");
curl_setopt($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/across-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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Across Bridge API

API health

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Related APIs

Wheatstone Bridge API

THORChain Cross-Chain Liquidity API

KyberSwap API

STON.fi API

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