Operated by SpendPreflight: free x402 Lint risk scores, paid Listing Guard and seller monitoring.
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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.
Exact public HTTP(S) URL already listed by Bazaar or x402scan
Advertised method such as GET or POST; required if the URL is ambiguous
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 $0.005 per cached lookup (shared free trial first). An unknown score means missing evidence; repeated paid calls may incur another charge.
| Argument | Type | Description |
|---|---|---|
| url* | string | Exact public HTTP(S) URL already listed by Bazaar or x402scan |
| method | string | Advertised method such as GET or POST; required if the URL is ambiguous |
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"required": [
"url"
],
"properties": {
"url": {
"type": "string",
"maxLength": 2048,
"minLength": 1,
"description": "Exact public HTTP(S) URL already listed by Bazaar or x402scan"
},
"method": {
"type": "string",
"maxLength": 16,
"minLength": 3,
"description": "Advertised method such as GET or POST; required if the URL is ambiguous"
}
},
"description": "Example arguments: {\"url\":\"https://api.spendpreflight.com/v1/check\",\"method\":\"GET\"}",
"additionalProperties": false
}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.
| Argument | Type | Description |
|---|---|---|
| url* | string | |
| method* | string |
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"required": [
"url",
"method"
],
"properties": {
"url": {
"type": "string",
"maxLength": 2048
},
"method": {
"enum": [
"GET",
"HEAD",
"POST"
],
"type": "string"
}
},
"description": "Example arguments: {\"url\":\"https://api.spendpreflight.com/v1/check\",\"method\":\"GET\"}",
"additionalProperties": false
}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 $0.01 per call (free trial first).
| Argument | Type | Description |
|---|---|---|
| name | string | Merchant or payee legal name |
| domain | string | Merchant domain or URL, e.g. shop.example.com |
| address | string | Payee wallet address (EVM 0x…, BTC, etc.) |
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"properties": {
"name": {
"type": "string",
"description": "Merchant or payee legal name"
},
"domain": {
"type": "string",
"description": "Merchant domain or URL, e.g. shop.example.com"
},
"address": {
"type": "string",
"description": "Payee wallet address (EVM 0x…, BTC, etc.)"
}
},
"description": "Example arguments: {\"name\":\"Example Shop LLC\"}",
"additionalProperties": false
}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 $0.05. Shared trial first.
| Argument | Type | Description |
|---|---|---|
| tier | string | |
| chain | string | |
| address* | string |
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"required": [
"address"
],
"properties": {
"tier": {
"enum": [
"basic",
"deep"
],
"type": "string",
"default": "basic"
},
"chain": {
"type": "string",
"const": "eip155:8453"
},
"address": {
"type": "string",
"pattern": "^0x[0-9a-fA-F]{40}$"
}
},
"description": "Example arguments: {\"address\":\"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913\",\"chain\":\"eip155:8453\",\"tier\":\"basic\"}",
"additionalProperties": false
}Nearest RV dump/water stations from FillPoint RV's dated September 17, 2026 ODbL snapshot. $0.01 for bounded straight-line proximity calculation, not live access, potable-water assurance or road routing. Snapshot age and unknown current conditions are explicit. Full underlying projection is free under ODbL.
| Argument | Type | Description |
|---|---|---|
| limit | integer | |
| service | string | |
| latitude* | number | |
| longitude* | number | |
| radius_km | number |
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"required": [
"latitude",
"longitude"
],
"properties": {
"limit": {
"type": "integer",
"default": 10,
"maximum": 50,
"minimum": 1
},
"service": {
"enum": [
"dump",
"water",
"either"
],
"type": "string",
"default": "either"
},
"latitude": {
"type": "number",
"maximum": 90,
"minimum": -90
},
"longitude": {
"type": "number",
"maximum": 180,
"minimum": -180
},
"radius_km": {
"type": "number",
"default": 50,
"maximum": 500,
"minimum": 0.1
}
},
"description": "Example arguments: {\"latitude\":42.07,\"longitude\":-88.36,\"radius_km\":50,\"limit\":10,\"service\":\"dump\"}",
"additionalProperties": false
}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.
No arguments.
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"properties": {},
"description": "Example arguments: {}",
"additionalProperties": false
}Free x402 Lint by SpendPreflight. Checks a public HTTPS endpoint with an unpaid GET: v1/v2 challenge shape, payTo/asset/network syntax, price, Bazaar metadata and browser CORS headers. Returns fixes and a public seven-day report link. No payment or credentials; GET cannot validate a POST-only endpoint or paid delivery. Do not submit private URLs.
| Argument | Type | Description |
|---|---|---|
| url* | string |
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"required": [
"url"
],
"properties": {
"url": {
"type": "string",
"maxLength": 2048,
"minLength": 1
}
},
"description": "Example arguments: {\"url\":\"https://api.spendpreflight.com/v1/check?name=Acme\"}",
"additionalProperties": false
}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.
| Argument | Type | Description |
|---|---|---|
| url* | string | |
| method* | string |
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"required": [
"url",
"method"
],
"properties": {
"url": {
"type": "string",
"maxLength": 2048
},
"method": {
"enum": [
"GET",
"HEAD",
"POST"
],
"type": "string"
}
},
"description": "Example arguments: {\"url\":\"https://api.spendpreflight.com/v1/check\",\"method\":\"GET\"}",
"additionalProperties": false
}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).
| Argument | Type | Description |
|---|---|---|
| cart | object | Use instead of challenge for agent checkout / card payments |
| rules | object | Spending rules; all optional. See get_service_info for defaults. |
| challenge | object | The x402 PaymentRequired body (v1 or v2) your agent received with HTTP 402 |
| resource_url | string | URL that returned the 402, if not inside the challenge |
| resource_method | string | Advertised method for an indexed URL with multiple methods |
| spent_today_usd | number |
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. $0.02 per calculation; no stored inputs.
| Argument | Type | Description |
|---|---|---|
| loads* | array | |
| battery | object | |
| panel_watts | number | |
| peak_sun_hours* | number | |
| pv_loss_fraction* | number | |
| inverter_efficiency | number |
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"required": [
"loads",
"peak_sun_hours",
"pv_loss_fraction"
],
"properties": {
"loads": {
"type": "array",
"items": {
"type": "object",
"required": [
"watts",
"hours_per_day",
"kind"
],
"properties": {
"kind": {
"enum": [
"ac",
"dc"
],
"type": "string"
},
"watts": {
"type": "number",
"maximum": 100000,
"minimum": 0
},
"quantity": {
"type": "integer",
"default": 1,
"maximum": 100,
"minimum": 1
},
"hours_per_day": {
"type": "number",
"maximum": 24,
"minimum": 0
}
},
"additionalProperties": false
},
"maxItems": 50,
"minItems": 1
},
"battery": {
"type": "object",
"required": [
"voltage",
"usable_fraction",
"autonomy_days"
],
"properties": {
"voltage": {
"type": "number",
"maximum": 1000,
"minimum": 1
},
"autonomy_days": {
"type": "number",
"maximum": 30,
"exclusiveMinimum": 0
},
"usable_fraction": {
"type": "number",
"maximum": 1,
"minimum": 0.05
},
"existing_capacity_ah": {
"type": "number",
"maximum": 1000000,
"minimum": 0
}
},
"additionalProperties": false
},
"panel_watts": {
"type": "number",
"maximum": 2000,
"minimum": 1
},
"peak_sun_hours": {
"type": "number",
"maximum": 24,
"exclusiveMinimum": 0
},
"pv_loss_fraction": {
"type": "number",
"maximum": 0.95,
"minimum": 0
},
"inverter_efficiency": {
"type": "number",
"maximum": 1,
"minimum": 0.1
}
},
"description": "Example arguments: {\"loads\":[{\"watts\":100,\"hours_per_day\":5,\"quantity\":1,\"kind\":\"dc\"}],\"peak_sun_hours\":4,\"pv_loss_fraction\":0.2,\"panel_watts\":200,\"battery\":{\"voltage\":12,\"usable_fraction\":0.8,\"autonomy_days\":2}}",
"additionalProperties": false
}| What this agent already spent today, for the daily cap |
{
"type": "object",
"$schema": "http://json-schema.org/draft-07/schema#",
"properties": {
"cart": {
"type": "object",
"properties": {
"pay_to": {
"type": "string"
},
"total_usd": {
"type": "number"
},
"merchant_name": {
"type": "string"
},
"merchant_domain": {
"type": "string"
}
},
"description": "Use instead of challenge for agent checkout / card payments",
"additionalProperties": false
},
"rules": {
"type": "object",
"properties": {
"usdc_only": {
"type": "boolean"
},
"require_live": {
"type": "boolean"
},
"daily_cap_usd": {
"type": "number",
"minimum": 0
},
"hold_above_usd": {
"type": "number",
"minimum": 0
},
"new_domain_days": {
"type": "number",
"minimum": 0
},
"payto_allowlist": {
"type": "array",
"items": {
"type": "string",
"maxLength": 128,
"minLength": 1
},
"maxItems": 100
},
"payto_blocklist": {
"type": "array",
"items": {
"type": "string",
"maxLength": 128,
"minLength": 1
},
"maxItems": 100
},
"allowed_networks": {
"type": "array",
"items": {
"type": "string",
"maxLength": 128,
"minLength": 1
},
"maxItems": 100
},
"domain_allowlist": {
"type": "array",
"items": {
"type": "string",
"maxLength": 253,
"minLength": 1
},
"maxItems": 100
},
"domain_blocklist": {
"type": "array",
"items": {
"type": "string",
"maxLength": 253,
"minLength": 1
},
"maxItems": 100
},
"screen_sanctions": {
"type": "boolean"
},
"strict_allowlist": {
"type": "boolean"
},
"max_price_multiple": {
"anyOf": [
{
"type": "number",
"exclusiveMinimum": 0
},
{
"type": "null"
}
]
},
"max_per_payment_usd": {
"type": "number",
"exclusiveMinimum": 0
},
"hold_on_payto_change": {
"type": "boolean"
}
},
"description": "Spending rules; all optional. See get_service_info for defaults.",
"additionalProperties": false
},
"challenge": {
"type": "object",
"description": "The x402 PaymentRequired body (v1 or v2) your agent received with HTTP 402",
"additionalProperties": {}
},
"resource_url": {
"type": "string",
"description": "URL that returned the 402, if not inside the challenge"
},
"resource_method": {
"type": "string",
"maxLength": 16,
"minLength": 3,
"description": "Advertised method for an indexed URL with multiple methods"
},
"spent_today_usd": {
"type": "number",
"description": "What this agent already spent today, for the daily cap"
}
},
"description": "Example arguments: {\"cart\":{\"merchant_name\":\"Example Shop LLC\",\"total_usd\":0.01},\"rules\":{\"max_per_payment_usd\":1},\"spent_today_usd\":0}",
"additionalProperties": false
}