simfuse.app
Buy a travel eSIM and get online the moment you land. QR code by email in seconds, plans for 205+ countries, no physical SIM, no roaming bills. Pay with Apple Pay or Google Pay.
First seen 2026-11-05 · Last seen 2026-11-05 · Source: webmcp.com
Answer 12 · Act 3 · Transact 1 · Score: Not yet scored
Tool inspector
build-plan
Build an eSIM plan to the traveller's liking for one destination: how much data, for how many days, optionally which network it runs on and whether calls and texts are bundled. Returns the one real plan that matches, with its id and live price, never a made-up combination: a shape nobody sells is snapped to the nearest one that is, one axis at a time, and every change is spelled out in `adjustments` so you can read it back. Use it when the traveller knows what they want ("10 GB on Docomo for two weeks"); use plan-trip when they want a recommendation or the trip has several countries. To buy, pass `plan.id` to get-checkout-link when a person is paying, or to create-checkout-session when you are. Read-only: it reserves nothing and charges nothing.
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Input schema
| Property | Type | Required | Description |
|---|---|---|---|
country_code |
string | yes | ISO 3166-1 alpha-2 code of the destination, e.g. "JP". Look it up with list-destinations rather than guessing. |
data_mb |
integer | yes | Data allowance wanted, in megabytes: 1 GB is 1024 MB, so 5 GB is 5120. Pass 0 for an unlimited plan. Snapped to the nearest size sold when no plan has exactly this size. |
validity_days |
integer | yes | How many days the plan should stay valid, 1 to 365. Snapped to the nearest length sold for the chosen size. |
network |
string | no | Optional. The mobile network the plan should run on, by carrier name as `options.networks` lists them, e.g. "NTT Docomo" or "au". Matching is case-insensitive and a single carrier of a multi-network plan is enough. Omit for the cheapest network. |
voice |
boolean | no | Optional. True to require a plan that bundles calls and texts. Defaults to false, data only. If no such plan exists the answer is data only and says so. |
currency |
string | no | Optional. ISO 4217 three-letter code the price is quoted in, e.g. "USD", "EUR", "GBP". Defaults to EUR. An unknown code falls back to EUR rather than failing. |
Raw JSON schema
{
"properties": {
"country_code": {
"description": "ISO 3166-1 alpha-2 code of the destination, e.g. \"JP\". Look it up with list-destinations rather than guessing.",
"minLength": 2,
"maxLength": 2,
"type": "string"
},
"data_mb": {
"description": "Data allowance wanted, in megabytes: 1 GB is 1024 MB, so 5 GB is 5120. Pass 0 for an unlimited plan. Snapped to the nearest size sold when no plan has exactly this size.",
"minimum": 0,
"type": "integer"
},
"validity_days": {
"description": "How many days the plan should stay valid, 1 to 365. Snapped to the nearest length sold for the chosen size.",
"minimum": 1,
"maximum": 365,
"type": "integer"
},
"network": {
"description": "Optional. The mobile network the plan should run on, by carrier name as `options.networks` lists them, e.g. \"NTT Docomo\" or \"au\". Matching is case-insensitive and a single carrier of a multi-network plan is enough. Omit for the cheapest network.",
"type": "string"
},
"voice": {
"description": "Optional. True to require a plan that bundles calls and texts. Defaults to false, data only. If no such plan exists the answer is data only and says so.",
"default": false,
"type": "boolean"
},
"currency": {
"description": "Optional. ISO 4217 three-letter code the price is quoted in, e.g. \"USD\", \"EUR\", \"GBP\". Defaults to EUR. An unknown code falls back to EUR rather than failing.",
"type": "string"
}
},
"type": "object",
"required": [
"country_code",
"data_mb",
"validity_days"
]
}
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