# Brük — verified XRP Ledger answers

> Verified XRP Ledger answers with proof: payment, send, and issuer checks. Pay per call via x402.

- name: com.brukledger/bruk
- version: 0.8.0
- connection class: R0 (autonomous)
- trust: 83/100 flags: no-repository
- quality: 81/100 (new)
- owner: not claimed
- descriptor: https://api.protogrid.dev/v1/servers/com.brukledger%2Fbruk
- tools: https://api.protogrid.dev/v1/servers/com.brukledger%2Fbruk/tools

**An agent can connect right now, no human step.** Remote endpoint, no authentication, reachable on the last probe.

## Connection (mcpServers)

```json
{
  "mcpServers": {
    "bruk": {
      "type": "http",
      "url": "https://bruk-agent-api.fly.dev/mcp"
    }
  }
}
```


## Trust

- hygiene: 80
- liveness: 100
- freshness: 100
- provenance: 55
- drivers: +dns-namespace +website +reachable +uptime-100% +updated-2d-ago -no-repository
- Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed.

## Quality 81/100 (new)

### protocol: 75 (weight 25)

- warn `protocol.modern`: newest supported version is 2025-11-25; 2026-07-28 not supported, older versions are deprecated until 2027-07-28
- n/a `protocol.stateless`: only applies to 2026-07-28 servers
- pass `protocol.transport`: streamable HTTP
- n/a `protocol.list_ttl`: only applies to 2026-07-28 servers

### authorization: n/a (weight 15)

- n/a `auth.prm`, `auth.as_metadata`, `auth.cimd`: no remote uses OAuth
- n/a `auth.secret_in_url`: no templated URL

### tool hygiene: 86 (weight 30)

- pass `tools.descriptions`: every tool has a description
- pass `tools.description_length`: descriptions are concise
- pass `tools.schemas`: every tool has an object input schema
- pass `tools.annotations`: 14 of 14 tools declare readOnlyHint or destructiveHint
- fail `tools.directory_hints`: no tool declares all four of readOnlyHint, destructiveHint, idempotentHint and openWorldHint; missing: payment_check (destructiveHint, idempotentHint); issuer_check (destructiveHint, idempotentHint); payment_watch (destructiveHint, idempotentHint); …
- pass `tools.token_cost`: about 2,639 tokens to load every tool
- pass `tools.api_dump`: tools are not a one-to-one API dump

### stability: n/a (weight 15)

- n/a `stability.changes`, `stability.rug_pull`: tool history recorded for 2 of the 7 days needed

### dependencies: n/a (weight 15)

- n/a `deps.known_vulns`, `deps.mcp_sdk_version`, `deps.resolvable`: no npm or PyPI package

- tools: 14, about 2,639 tokens to load them all
- tool set hash: 01789319dd9df117dc27a3e2acdccfd5
- tools last changed: 2026-10-20T04:05:07.751Z
- badge: [![protogrid quality](https://protogrid.dev/badge/com.brukledger/bruk.svg)](https://protogrid.dev/servers/com.brukledger/bruk)
- Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed.

### Tool changes

- 2026-10-20 `token_types` added
  - Free guide, not a live check. Which XRP Ledger token types Brük can identify, how to pass an MPT issuance id, and which other chains Brük does not read.
- 2026-10-20 `get_sample` changed (inputSchema)
- 2026-10-20 `send_check` changed (description, inputSchema)
  - before: Pre-send check for an XRP Ledger payment: whether the destination is activated, requires a destination tag, blocks or pre-approves senders, can hold the token (trust line, limit, freeze, issuer approval), is blackholed, and whether the source can afford it. Returns ok_to_send, send_with_caution, or will_fail with reasons. Useful before any irreversible XRP Ledger payment. Price about $0.005 per call via x402 (USDC on Base, or XRP / RLUSD on the XRP Ledger). Without a payment the tool returns the x402 payment requirements; bad input and ledger outages are never charged.
  - after: Pre-send check for an XRP Ledger payment: whether the destination is activated, requires a destination tag, blocks or pre-approves senders, can hold the token (trust line, or MPT opt-in and issuer approval), is blackholed, and whether the source can afford it. For a multi-purpose token, pass mpt_issuance_id instead of currency and issuer. Returns ok_to_send, send_with_caution, or will_fail with reasons. Useful before any irreversible XRP Ledger payment. Price about $0.005 per call via x402 (USDC on Base, or XRP / RLUSD on the XRP Ledger). Without a payment the tool returns the x402 payment requirements; bad input and ledger outages are never charged.
- 2026-10-20 `token_check` added
  - Identifies one XRP Ledger token from the validated ledger: a trust-line token (currency code plus issuer) or a multi-purpose token (48-hex issuance id). Reports the type, issuer domain check, supply, and controls that can freeze, lock, claw back, or restrict holders. Issuer-written metadata is quoted and is not treated as fact; a missing asset class is reported missing. Does not check other chains, and does not rate legal backing or solvency. Useful before accepting an MPT or any other token. Price about $0.01 per call via x402 (USDC on Base, or XRP / RLUSD on the XRP Ledger). Without a payment the tool returns the x402 payment requirements; bad input and ledger outages are never charged.
- 2026-10-18 `free_send_check` added
  - Free, one per user per day. Before sending XRP or a token on the XRP Ledger: will the payment fail (missing destination tag, unfunded or deleted account, no trust line, wrong issuer) and what should you double-check? Returns the verdict, blockers, and cautions from a validated ledger. The paid send_check adds the full evidence and has no daily limit.
- 2026-10-18 `ledger_moment` added
  - Ledger moment image (1200x675 PNG): one validated XRP Ledger ledger drawn as one tile per transaction in ledger order, colored by type (payments, DEX offers, trust lines, AMM, NFTs, other), failed transactions hollow, with counts, fees burned, XRP supply, and the ledger hash. Latest validated ledger by default. Useful for posts, reports, and newsletters about network activity. Price about $0.02 per call via x402 (USDC on Base, or XRP / RLUSD on the XRP Ledger). Without a payment the tool returns the x402 payment requirements; bad input and ledger outages are never charged.
- 2026-10-18 `receipt_card` added
  - Verified payment receipt image (1200x675 PNG) for an XRP Ledger payment, drawn only from the validated ledger: delivered amount, sender, recipient, destination tag, ledger, close time, result, optional expectation checks, and a QR code to the public explorer. Only final outcomes are drawn; not-found or unvalidated transactions are not charged. Useful for showing a person proof that a payment arrived. Price about $0.02 per call via x402 (USDC on Base, or XRP / RLUSD on the XRP Ledger). Without a payment the tool returns the x402 payment requirements; bad input and ledger outages are never charged.

Full history: https://api.protogrid.dev/v1/servers/com.brukledger%2Fbruk/changes

## Remotes

- https://bruk-agent-api.fly.dev/mcp (streamable-http, auth none, reachable true, uptime30d 1)

## Packages

_none_

## Tools (14)

- `free_send_check`: Free, one per user per day. Before sending XRP or a token on the XRP Ledger: will the payment fail (missing destination tag, unfunded or deleted account, no trust line, wrong issuer) and what should you double-check? Returns the verdict, blockers, and cautions from a validated ledger. The paid send_check adds the full evidence and has no daily limit.
- `get_sample`: Free. Returns a recent real answer from a Brük service (cached up to 5 minutes) so you can see the format before paying.
- `issuer_check`: Checks whether an XRP Ledger token issuer is who it claims to be: two-way domain verification (on-ledger Domain field against the domain's xrp-ledger.toml), tokens issued and outstanding, and control flags such as freeze, clawback, blackholed, and multisign. Useful before accepting or holding a token. Price about $0.01 per call via x402 (USDC on Base, or XRP / RLUSD on the XRP Ledger). Without a payment the tool returns the x402 payment requirements; bad input and ledger outages are never charged.
- `large_payments`: Lists large XRP Ledger payments (50,000+ XRP or major stablecoins) in a recent window of up to 120 minutes, each independently re-checked on the ledger, with an explicit note when the window is not fully covered. Useful for market and liquidity monitoring. Price about $0.02 per call via x402 (USDC on Base, or XRP / RLUSD on the XRP Ledger). Without a payment the tool returns the x402 payment requirements; bad input and ledger outages are never charged.
- `learn_about_bruk`: Free. Brük's site, its short film about the XRP Ledger (chapters, transcript, captions), and the credit line for quoting it.
- `ledger_moment`: Ledger moment image (1200x675 PNG): one validated XRP Ledger ledger drawn as one tile per transaction in ledger order, colored by type (payments, DEX offers, trust lines, AMM, NFTs, other), failed transactions hollow, with counts, fees burned, XRP supply, and the ledger hash. Latest validated ledger by default. Useful for posts, reports, and newsletters about network activity. Price about $0.02 per call via x402 (USDC on Base, or XRP / RLUSD on the XRP Ledger). Without a payment the tool returns the x402 payment requirements; bad input and ledger outages are never charged.
- `ledger_pulse`: XRP Ledger network health right now: latest validated ledger, close time, transactions and payments in it, fee levels, load, and rolling averages cross-checked against a direct ledger read. Useful before submitting XRP Ledger transactions or when reporting current network conditions. Price about $0.001 per call via x402 (USDC on Base, or XRP / RLUSD on the XRP Ledger). Without a payment the tool returns the x402 payment requirements; bad input and ledger outages are never charged.
- `list_services`: Free. Lists every Brük service with price, inputs, and its HTTP endpoint.
- `payment_check`: Verifies that an XRP Ledger payment settled as expected: validation, result code, destination, destination tag, currency, issuer, and the amount actually delivered, which exposes partial-payment tricks. Useful when confirming that a customer or counterparty really paid. Price about $0.01 per call via x402 (USDC on Base, or XRP / RLUSD on the XRP Ledger). Without a payment the tool returns the x402 payment requirements; bad input and ledger outages are never charged.
- `payment_watch`: Payment arrival alert: watches an XRP Ledger address for up to 24 hours and POSTs a signed webhook when a matching payment is final (validated, tesSUCCESS, delivered amount checked), or a watch.expired event if none arrives. Payments that land during restarts are still caught. Useful when waiting on an incoming payment without polling. Price about $0.05 per call via x402 (USDC on Base, or XRP / RLUSD on the XRP Ledger). Without a payment the tool returns the x402 payment requirements; bad input and ledger outages are never charged.
- `receipt_card`: Verified payment receipt image (1200x675 PNG) for an XRP Ledger payment, drawn only from the validated ledger: delivered amount, sender, recipient, destination tag, ledger, close time, result, optional expectation checks, and a QR code to the public explorer. Only final outcomes are drawn; not-found or unvalidated transactions are not charged. Useful for showing a person proof that a payment arrived. Price about $0.02 per call via x402 (USDC on Base, or XRP / RLUSD on the XRP Ledger). Without a payment the tool returns the x402 payment requirements; bad input and ledger outages are never charged.
- `send_check`: Pre-send check for an XRP Ledger payment: whether the destination is activated, requires a destination tag, blocks or pre-approves senders, can hold the token (trust line, or MPT opt-in and issuer approval), is blackholed, and whether the source can afford it. For a multi-purpose token, pass mpt_issuance_id instead of currency and issuer. Returns ok_to_send, send_with_caution, or will_fail with reasons. Useful before any irreversible XRP Ledger payment. Price about $0.005 per call via x402 (USDC on Base, or XRP / RLUSD on the XRP Ledger). Without a payment the tool returns the x402 payment requirements; bad input and ledger outages are never charged.
- `token_check`: Identifies one XRP Ledger token from the validated ledger: a trust-line token (currency code plus issuer) or a multi-purpose token (48-hex issuance id). Reports the type, issuer domain check, supply, and controls that can freeze, lock, claw back, or restrict holders. Issuer-written metadata is quoted and is not treated as fact; a missing asset class is reported missing. Does not check other chains, and does not rate legal backing or solvency. Useful before accepting an MPT or any other token. Price about $0.01 per call via x402 (USDC on Base, or XRP / RLUSD on the XRP Ledger). Without a payment the tool returns the x402 payment requirements; bad input and ledger outages are never charged.
- `token_types`: Free guide, not a live check. Which XRP Ledger token types Brük can identify, how to pass an MPT issuance id, and which other chains Brük does not read.