SpendPreflight
REMOTE · API.SPENDPREFLIGHT.COM
Operated by SpendPreflight: free x402 Lint risk scores, paid Listing Guard and seller monitoring.
Available components
Last scanned (5 hours ago)
Scores higher than 66% of remote servers
Reachable. Last reached 24 Oct 2026.
Category Security
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 Security63
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one. See how to fix → View diagnostics → Partial
- HTTPS check failed: the endpoint is reachable over plaintext HTTP. See how to fix → View diagnostics → Fail
- 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 Usability79
- 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).Pass
- AI-judged instruction clarity (good).Pass
- Context-footprint check failed: tool/resource definitions use about 1695 tokens (~130/item across 13 items; 10 tools + 3 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 Management57
- Stability observed for 17 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage82
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 37% of tool parameters carry a description.Partial
- Structured output schemas are declared (40% of tools); any adoption earns full credit.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 10 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 12 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
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.
- 24 Oct 26 0
- Tool “check_token” rewrote its description, which is the text the model reads security
- New tool “check_listing” functional
- 23 Oct 26 −1
- Tool coverage: 92% → 39% ▼ functional
- Schema quality: 1112 → 1590 ▼ functional
- Tool coverage: 80% → 44% ▼ functional
- Schema quality: excellent → good functional
- New tool “check_token” functional
- New tool “find_rv_stations” functional
- New tool “listing_guard” functional
- New tool “size_solar” functional
- 21 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 43 to 47. That category is still filling its 30-day observation window: 13 days of observed history at the previous scan, 14 at this one. The score rises as the window fills, whether or not the server changes.
- 19 Oct 26 0
- Tool coverage: 100% → 80% ▼ functional
- Tool coverage: 100% → 92% ▼ functional
- New tool “lint_endpoint” functional
- 18 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 33 to 37. That category is still filling its 30-day observation window: 10 days of observed history at the previous scan, 11 at this one. The score rises as the window fills, whether or not the server changes.
- 16 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 27 to 30. That category is still filling its 30-day observation window: 8 days of observed history at the previous scan, 9 at this one. The score rises as the window fills, whether or not the server changes.
- 15 Oct 26 0
- Tool “check_payee” rewrote its description, which is the text the model reads security
- Tool “get_service_info” rewrote its description, which is the text the model reads security
- Tool “preflight_payment” rewrote its description, which is the text the model reads security
- 14 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.
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 Oct 2026 · Probed https://api.spendpreflight.com/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=spendpreflight.com | CN=WE1,O=Google Trust Services,C=US | 6 Oct 2026 | 4 Jan 2027 | ECDSA 256 | ECDSA-SHA256 | 99a1bf0c3e26fe1305222368ce23a8 |
| SANs: spendpreflight.com, api.spendpreflight.com, *.api.spendpreflight.com | ||||||
| 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 api.spendpreflight.com. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| com. | present | 19718 | 13 | Verified |
| spendpreflight.com. | 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://api.spendpreflight.com/mcp | Verified | 200 | |
| http (plaintext) | http://api.spendpreflight.com/mcp | Served over HTTP | 200 |
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 →
check_endpoint Read an x402 endpoint's observed health ~195
Cached x402 endpoint observations, operated by SpendPreflight. Returns a transparent score (or unknown), its components and seven-day unpaid probe history for an already publicly listed URL. Never fetches the caller's URL or pays the endpoint. Unlisted, unavailable or stale data is not charged. This is not a paid-delivery or compliance guarantee. Provide the exact resource URL; add method when the URL has multiple advertised methods. Use for endpoint history and price context before paying. Use check_payee for wallet/name screening or preflight_payment for an allow/hold/block decision. Price $0.005 per cached lookup (shared free trial first). An unknown score means missing evidence; repeated paid calls may incur another charge.
| Name | Type | Req | Description |
|---|---|---|---|
| method | string | – | Advertised method such as GET or POST; required if the URL is ambiguous |
| url | string | yes | Exact public HTTP(S) URL already listed by Bazaar or x402scan |
| Name | Type | Req | Description |
|---|---|---|---|
| assessment | object | yes | – |
| category | string | yes | – |
| components | object | yes | – |
| data_as_of | string | yes | – |
| disclaimer | string | yes | – |
| history | array | yes | – |
| method | string | yes | – |
| methodology | string | yes | – |
| observed_at | string|null | yes | – |
| operator | string | yes | – |
| score | – | yes | – |
| sources | array | yes | – |
| url | string | yes | – |
No examples provided.
check_listing Bazaar Listing Guard ~94
Bazaar Listing Guard: CDP technical validation plus a bounded heuristic metadata screen for agent-directed instructions, embedded URLs, tool calls, invisible Unicode, long fields and prices above 100x a fresh Scout category median. Returns riskScore, flagged spans and rewrite suggestions. Not Coinbase policy certification or guaranteed detection. Public HTTPS only; no target payment or request bodies stored.
| Name | Type | Req | Description |
|---|---|---|---|
| method | string | yes | – |
| url | string | yes | – |
No output schema declared.
No examples provided.
check_payee Check payee before paying ~198
Payee risk check. Screens a payee wallet address and name against the OFAC SDN sanctions list and checks the merchant domain's registration age and DNS. Returns risk low|medium|high|unknown with flags such as sanctioned_address, sanctioned_name_possible, new_domain. Call this before a USDC payment when you only have a payee name, wallet or domain. Provide at least one of domain, address, or name; inputs may be combined, and domain accepts a hostname or URL. For an x402 challenge or cart and an allow/hold/block spending-rule decision, use preflight_payment instead. Price $0.01 per call (free trial first).
| Name | Type | Req | Description |
|---|---|---|---|
| address | string | – | Payee wallet address (EVM 0x…, BTC, etc.) |
| domain | string | – | Merchant domain or URL, e.g. shop.example.com |
| name | string | – | Merchant or payee legal name |
| Name | Type | Req | Description |
|---|---|---|---|
| data_as_of | string | yes | Timestamp of the sanctions data used |
| disclaimer | string | yes | – |
| domain | – | – | Domain age/DNS signals, or null if no domain given |
| flags | array | yes | e.g. sanctioned_address, sanctioned_name_exact, sanctioned_name_possible, new_domain, domain_no_dns |
| risk | string | yes | Overall payee risk |
| sanctions | object | yes | OFAC SDN matches |
No examples provided.
check_token Base token / contract safety signals ~164
Base contract safety signals from bounded public-chain reads and OFAC. Basic: deployed bytecode and SDN match. Deep adds standard owner(), paused(), totalSupply(), decimals() and ERC-1967 storage observations, exact ERC-1167 minimal-proxy target detection, a Sourcify runtime-verification claim matched to current bytecode, and direct-deployment age when independently supported by the creation receipt. Honeypot/sellability, liquidity locks, holder concentration and scam lists are NOT assessed. Missing data is unknown; never a safe-to-buy verdict. Informational, not financial advice. Basic $0.02; deep $0.05. Shared trial first.
| Name | Type | Req | Description |
|---|---|---|---|
| address | string | yes | – |
| chain | string | – | – |
| tier | string | – | – |
No output schema declared.
No examples provided.
find_rv_stations FillPoint archived station proximity ~114
Nearest RV dump/water stations from FillPoint RV's dated September 17, 2026 ODbL snapshot. $0.01 for bounded straight-line proximity calculation, not live access, potable-water assurance or road routing. Snapshot age and unknown current conditions are explicit. Full underlying projection is free under ODbL.
| Name | Type | Req | Description |
|---|---|---|---|
| latitude | number | yes | – |
| limit | integer | – | – |
| longitude | number | yes | – |
| radius_km | number | – | – |
| service | string | – | – |
No output schema declared.
No examples provided.
get_service_info SpendPreflight: pricing, defaults, how to pay ~104
Free, read-only service reference. Use when you need prices, default spending rules, payment setup, trial allowance, or a ready-to-use example call. If you already have a payment challenge or cart, call preflight_payment directly; this reference call is optional. Takes no arguments and performs no payee screening or payment decision. Use check_payee for standalone payee risk; use preflight_payment for an x402 challenge or cart and an allow/hold/block decision.
Input schema present but exposes no named parameters.
| Name | Type | Req | Description |
|---|---|---|---|
| client_guard | string | yes | – |
| default_rules | object | yes | – |
| disclaimer | string | yes | – |
| example_call | object | yes | – |
| example_note | string | yes | – |
| free_trial_per_day | number | yes | – |
| guarantees | array | yes | – |
| guidance_version | string | yes | – |
| http_api | object | yes | – |
| payment | object | yes | – |
| pricing | object | yes | – |
| site | string | yes | – |
| trust | object | yes | – |
| when_to_use | string | yes | – |
No examples provided.
lint_endpoint Free x402 Lint ~91
Free x402 Lint by SpendPreflight. Checks a public HTTPS endpoint with an unpaid GET: v1/v2 challenge shape, payTo/asset/network syntax, price, Bazaar metadata and browser CORS headers. Returns fixes and a public seven-day report link. No payment or credentials; GET cannot validate a POST-only endpoint or paid delivery. Do not submit private URLs.
| Name | Type | Req | Description |
|---|---|---|---|
| url | string | yes | – |
No output schema declared.
No examples provided.
listing_guard Bazaar Listing Guard ~94
Bazaar Listing Guard: CDP technical validation plus a bounded heuristic metadata screen for agent-directed instructions, embedded URLs, tool calls, invisible Unicode, long fields and prices above 100x a fresh Scout category median. Returns riskScore, flagged spans and rewrite suggestions. Not Coinbase policy certification or guaranteed detection. Public HTTPS only; no target payment or request bodies stored.
| Name | Type | Req | Description |
|---|---|---|---|
| method | string | yes | – |
| url | string | yes | – |
No output schema declared.
No examples provided.
preflight_payment Preflight a payment (allow / hold / block) ~307
Call this before any x402/USDC payment to evaluate the actual challenge or cart before signing. Spend preflight for AI agents. Send the x402 PaymentRequired body (v1 or v2) you received, or a cart, plus optional rules (per-payment max, hold threshold, daily cap, allowlists, new-domain days, endpoint category price multiple, liveness and payTo changes). Returns allow|hold|block with reasons, the cheapest acceptable payment option, and a receipt id. Read-only: never signs, settles, or holds funds. Use before every payment. It includes payee screening in its spending-rule decision. For standalone wallet, name, or domain screening without a payment, use check_payee instead. Each repeat call creates a new receipt and may consume another trial or paid call. Price $0.02 per call (free trial first).
| Name | Type | Req | Description |
|---|---|---|---|
| cart | object | – | Use instead of challenge for agent checkout / card payments |
| challenge | object | – | The x402 PaymentRequired body (v1 or v2) your agent received with HTTP 402 |
| resource_method | string | – | Advertised method for an indexed URL with multiple methods |
| resource_url | string | – | URL that returned the 402, if not inside the challenge |
| rules | object | – | Spending rules; all optional. See get_service_info for defaults. |
| spent_today_usd | number | – | What this agent already spent today, for the daily cap |
| Name | Type | Req | Description |
|---|---|---|---|
| chosen_option | – | – | The cheapest acceptable payment option |
| decision | string | yes | Pay on allow, ask a human on hold, never pay on block |
| index_evidence | object | yes | – |
| options_evaluated | integer | yes | – |
| payee | – | – | Payee screening details |
| reasons | array | yes | Every rule that fired, prefixed with its decision |
| receipt | object | yes | Signed decision; keep privately for audit |
No examples provided.
size_solar Wattpath solar energy-balance estimate ~117
Off-grid PV energy-balance estimate based on Wattpath by Nomad Energy Club. Supply daily loads, peak sun hours, PV losses, and optional battery assumptions. No location/weather lookup, electrical design, surge or installation certification. $0.02 per calculation; no stored inputs.
| Name | Type | Req | Description |
|---|---|---|---|
| battery | object | – | – |
| inverter_efficiency | number | – | – |
| loads | array | yes | – |
| panel_watts | number | – | – |
| peak_sun_hours | number | yes | – |
| pv_loss_fraction | number | yes | – |
No output schema declared.
No examples provided.
How do I install the SpendPreflight MCP server?
SpendPreflight is a hosted endpoint at https://api.spendpreflight.com/mcp, 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 · api.spendpreflight.com
claude mcp add --transport http spendpreflight-spendpreflight 'https://api.spendpreflight.com/mcp'
What is the SpendPreflight MCP server?
SpendPreflight is an MCP server listed in the public MCP registry as io.github.spendpreflight/spendpreflight. Operated by SpendPreflight: free x402 Lint risk scores, paid Listing Guard and seller monitoring. This page covers its hosted endpoint (https://api.spendpreflight.com/mcp).
Is the SpendPreflight MCP server safe to use?
SpendPreflight scores 74 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 SpendPreflight MCP server expose?
SpendPreflight exposes 10 tools: listing_guard, check_listing, find_rv_stations, size_solar, check_token, and 5 more. Their descriptions and schemas cost roughly 1,478 tokens of context every time the server is loaded.
Does the SpendPreflight MCP server require authentication?
No. We connected to SpendPreflight without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the SpendPreflight MCP server still maintained?
SpendPreflight is still listed as active in the MCP registry. We last reached this channel on 24 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.