# Bridge coverage · HyperCore API · Femtos

> Every HyperCore ↔ HyperEVM leg since our data starts, paired with its other leg: matched share per direction and token, why the others are not, latency.

- Base URL: `https://api.femtos.xyz/v1` (REST) · `wss://api.femtos.xyz/v1/ws` (WebSocket) · MCP: `https://api.femtos.xyz/mcp`
- Auth: `Authorization: Bearer $FEMTOS_KEY` (or `X-API-KEY: $FEMTOS_KEY`). Free key: https://femtos.xyz/accounts/ (browser), or with
  no browser: `GET https://femtos.xyz/accounts/agent/challenge`, solve its proof of work, then `POST https://femtos.xyz/accounts/agent/signup`
  (https://femtos.xyz/agents.md#agent-onboarding)
- Decimals are exact strings, times Unix milliseconds, addresses lowercase `0x`
- Whole API in one file: https://femtos.xyz/agents.md · OpenAPI: https://api.femtos.xyz/v1/openapi.json · Index: https://femtos.xyz/llms.txt
- Page with live calls: https://femtos.xyz/hypercore/bridge-coverage

## Bridge coverage — GET `/v1/bridges/coverage`

Every HyperCore ↔ HyperEVM leg since our data starts, paired with its other leg: matched share per direction and token, why the others are not, latency.

| Param | In | Example or values |
|---|---|---|
| `window` | query | `all`, `30d`, `7d`, `24h` |

```bash
curl -H "Authorization: Bearer $FEMTOS_KEY" "https://api.femtos.xyz/v1/bridges/coverage?window=all"
```

| Field | Type | Meaning |
|---|---|---|
| `directions.evm_to_core · core_to_evm` | object | {legs, matched, coverage, unmatched: {reason: n}, notALeg, latencyMs: {p50, p90, p99, p999, max}, tokens[]} |
| `coverage` | number | matched / (legs − not legs − in flight): 1 = every settled leg has its other leg |
| `unmatched` | object | in_flight · missing_peer · amount_mismatch · late_peer · unknown_token |
| `core_to_evm.matchedBy` | object | {nonce: exact (coreReceiveWithData), order: same key in order} |
| `unpairedCredits` | object \| null | credits on the receiving side no leg took |
| `source · settledUntil` | string · ms | materialized tables (and how far they are settled) or the views |

## Related (Bridge & wallet)

- [Bridge transfers](https://femtos.xyz/hypercore/bridge.md): Matched HyperCore ↔ HyperEVM transfers with 24 h stats.
- [Bridge stream](https://femtos.xyz/hypercore/ws-bridge.md): Each HyperCore ↔ HyperEVM transfer, initiated then completed.
- [Cross-layer wallet](https://femtos.xyz/hypercore/wallet.md): One address (or a named wallet's handle) on HyperCore, HyperEVM and Elysium, plus its latest events.
- [Wallet stream](https://femtos.xyz/hypercore/ws-wallet.md): Every event of the three layers touching one address.
- [Ledger stream](https://femtos.xyz/hypercore/ws-ledger.md): Deposits, withdrawals, transfers and other non-trade balance moves.

All HyperCore endpoints: https://femtos.xyz/hypercore.md