Frankfurter
REMOTE · MCP.FRANKFURTER.DEV · SCANNED SEP 24
Convert currencies and fetch blended FX rates from 50+ institutional sources.
Available components
How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. How we score → Why this is hard to score →
Endpoint Security57
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- Authorisation not fully verified: no authorisation is required to call this server, and 4 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe. See how to fix → View diagnostics → Unverified
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- HSTS check failed: the Strict-Transport-Security header is absent. See how to fix → View diagnostics → Fail
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability72
- AI-judged instruction clarity (excellent).Pass
- Context-footprint check failed: tool/resource definitions use about 714 tokens (~178/item across 4 items; 4 tools + 0 resources), over budget; trim descriptions and params. See how to fix → Fail
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management100
- No destabilizing schema changes in the last 30 days.Pass
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 4 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 5 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
How do I install the Frankfurter MCP server?
Frankfurter is a hosted endpoint at https://mcp.frankfurter.dev/, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
remote · mcp.frankfurter.dev
claude mcp add --transport http lineofflight-frankfurter 'https://mcp.frankfurter.dev/'
{
"mcpServers": {
"lineofflight-frankfurter": {
"url": "https://mcp.frankfurter.dev/"
}
}
} {
"servers": {
"lineofflight-frankfurter": {
"type": "http",
"url": "https://mcp.frankfurter.dev/"
}
}
} [mcp_servers.lineofflight-frankfurter] url = "https://mcp.frankfurter.dev/"
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"lineofflight-frankfurter": {
"type": "remote",
"url": "https://mcp.frankfurter.dev/",
"enabled": true
}
}
} openclaw mcp add lineofflight-frankfurter --url 'https://mcp.frankfurter.dev/' --transport streamable-http
mcp_servers:
lineofflight-frankfurter:
url: "https://mcp.frankfurter.dev/" {
"McpServers": {
"lineofflight-frankfurter": {
"Transport": "http",
"Url": "https://mcp.frankfurter.dev/"
}
}
} assistant mcp add lineofflight-frankfurter -t streamable-http -u 'https://mcp.frankfurter.dev/'
{
"mcpServers": {
"lineofflight-frankfurter": {
"type": "http",
"url": "https://mcp.frankfurter.dev/"
}
}
} The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 23 Sept 26 0
- The server rewrote its instructions, which are the text every model session reads security
- Tool “get_rates” rewrote its description, which is the text the model reads security
- “get_rates” changed the type of “provider”: string → array ▼ functional
- Server version: 0.5.0 → 0.5.1 functional
- “get_rates” added an optional parameter “providers” cosmetic
- “convert” reworded the description of “provider” cosmetic
- “get_rates” reworded the description of “provider” cosmetic
- 10 Sept 26 −1
- The server rewrote its instructions, which are the text every model session reads security
- Tool “convert” rewrote its description, which is the text the model reads security
- Tool “get_rates” rewrote its description, which is the text the model reads security
- Schema quality: pass → fail ▼ functional
- Server version: 0.4.3 → 0.5.0 functional
- New tool “list_providers” functional
- “convert” added an optional parameter “provider” cosmetic
- “get_rates” added an optional parameter “provider” cosmetic
- 26 Aug 26 79
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 25 Aug 26 0
- Stability: 0.97 → pass security
- 11 Aug 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 31 Jul 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 30 Jul 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 27 Jul 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 24 Sept 2026 · Probed https://mcp.frankfurter.dev/
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=frankfurter.dev | CN=WE1,O=Google Trust Services,C=US | 21 Sept 2026 | 20 Dec 2026 | ECDSA 256 | ECDSA-SHA256 | fd872eb596a065370e9ff911ab059d69 |
| SANs: frankfurter.dev, *.frankfurter.dev | ||||||
| CN=WE1,O=Google Trust Services,C=US (CA) | CN=GTS Root R4,O=Google Trust Services LLC,C=US | 13 Dec 2023 | 20 Feb 2029 | ECDSA 256 | ECDSA-SHA384 | 7ff31977972c224a76155d13b6d685e3 |
| CN=GTS Root R4,O=Google Trust Services LLC,C=US (CA) | CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE | 15 Nov 2023 | 28 Jan 2028 | ECDSA 384 | SHA256-RSA | 7fe530bf331343bedd821610493d8a1b |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of mcp.frankfurter.dev. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| dev. | present | 60074 | 8 | Verified |
| frankfurter.dev. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://mcp.frankfurter.dev/ | Verified | 200 | |
| http (plaintext) | http://mcp.frankfurter.dev/ | HTTPS enforced | 301 | https://mcp.frankfurter.dev/ |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
convert Convert currency ~247
Convert an amount from one currency to another. Returns {amount, currency} rounded to the target's minor units. Upstream rounds rates per direction; for low-value sources, flip via `get_rates` for more precision. Pass `provider` to use one institution's published rate, e.g. UST for a U.S. Treasury reporting rate.
| Name | Type | Req | Description |
|---|---|---|---|
| amount | number | yes | Amount in the source currency. Normalize localized input first: '100,50' -> 100.5; German '1.000,50' -> 1000.5; English '1,000.50' -> 1000.5. |
| date | string | – | Date YYYY-MM-DD for a past rate; omit for latest. |
| from | string | yes | ISO 4217 source currency. |
| provider | string | – | Provider key, e.g. ECB for European Central Bank or UST for U.S. Treasury reporting rates. Serves that institution's published rates instead of the blend; a date inside a monthly or quarterly provide… |
| to | string | yes | ISO 4217 target currency. |
No output schema declared.
No examples provided.
get_rates Get exchange rates ~181
Latest or a single day's exchange rates. The raw-rate companion to `convert`. With `provider`, published rates from one or more institutions: on its own base the digits are as published, with the date they took effect.
| Name | Type | Req | Description |
|---|---|---|---|
| base | string | – | ISO 4217 base currency. Default EUR. |
| date | string | – | Single day YYYY-MM-DD. Omit for the latest rates. |
| provider | array | – | Provider key or keys, e.g. ECB or ['ECB', 'HMRC']. Serves published rates instead of the blend; a date inside a monthly or quarterly provider's period returns the rate in force. Keys at https://frank… |
| providers | array | – | Alias for `provider` accepting multiple provider keys. |
| quotes | array | – | ISO 4217 quote codes to return; omit for all. |
No output schema declared.
No examples provided.
list_currencies List currencies ~37
List all supported ISO 4217 currency codes and their full names (e.g. { 'USD': 'United States Dollar' }).
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
list_providers List providers ~64
List the institutions whose rates Frankfurter relays, with key, rate type, frequency (daily, monthly or quarterly) and coverage dates. Use a key as `provider` in `convert` or `get_rates` for that institution's published rates instead of the blend.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
What is the Frankfurter MCP server?
Frankfurter is an MCP server listed in the public MCP registry as io.github.lineofflight/frankfurter. Convert currencies and fetch blended FX rates from 50+ institutional sources. This page covers its hosted endpoint (https://mcp.frankfurter.dev/).
Is the Frankfurter MCP server safe to use?
Frankfurter scores 78 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.
What tools does the Frankfurter MCP server expose?
Frankfurter exposes 4 tools: get_rates, convert, list_currencies, list_providers. Their descriptions and schemas cost roughly 529 tokens of context every time the server is loaded.
Does the Frankfurter MCP server require authentication?
No. We connected to Frankfurter without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the Frankfurter MCP server still maintained?
Frankfurter is still listed as active in the MCP registry. We last reached this channel on 24 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.