TCP MSS from an MTU for IPv4 or IPv6, effective MTU through tunnels (PPPoE, GRE,
TCP MSS from an MTU for IPv4 or IPv6, effective MTU through tunnels (PPPoE, GRE, VXLAN, WireGuard) and IPv4 fragment counts.
Answeringour last check, 2026-10-21
1 of 1checks answered this week
717 msmedian answer time
$0.02listed price per call
$0.02price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
GET https://network-calc.x402tookit.com/mtu-mss
| Category | Everything else |
|---|---|
| Provider host | network-calc.x402tookit.com |
| Networks | eip155:137, eip155:42161, eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| Payment schemes | exact |
| Self-reported calls, 30 days | 2 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-21 | valid payment request | 402 | $0.02 | 717 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"ipVersion": 4,
"mtu": 1500,
"payloadBytes": 4000,
"tcpTimestamps": "false",
"tunnel": "wireguard-ipv4"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"ipVersion": {
"description": "4 (default) or 6",
"type": "integer"
},
"mtu": {
"description": "Link MTU in bytes (the IP packet size, 1500 for Ethernet)",
"type": "integer"
},
"payloadBytes": {
"description": "IPv4 payload to send, to count fragments (UDP datagram incl. 8-byte header, or any IP payload)",
"type": "integer"
},
"tcpTimestamps": {
"description": "true: TCP timestamp option (12 bytes) is in use",
"type": "string"
},
"tunnel": {
"description": "Encapsulation: none, pppoe, gre, gre-ipv6, ipip, vxlan, geneve, wireguard-ipv4, wireguard-ipv6, mpls (default none)",
"enum": [
"none",
"pppoe",
"gre",
"gre-ipv6",
"ipip",
"vxlan",
"geneve",
"wireguard-ipv4",
"wireguard-ipv6",
"mpls"
],
"type": "string"
}
},
"required": [
"mtu"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"asOf": {
"type": [
"null",
"string"
]
},
"clampMssTo": {
"type": [
"null",
"number"
]
},
"degraded": {
"type": [
"boolean",
"null"
]
},
"disclaimer": {
"type": [
"null",
"string"
]
},
"effectiveMtu": {
"type": [
"null",
"number"
]
},
"fragmentation": {
"properties": {
"fragmentPayloadBytes": {
"type": [
"null",
"number"
]
},
"fragments": {
"type": [
"null",
"number"
]
},
"payloadBytes": {
"type": [
"null",
"number"
]
},
"totalIpBytes": {
"type": [
"null",
"number"
]
}
},
"type": [
"null",
"object"
]
},
"ipHeaderBytes": {
"type": [
"null",
"number"
]
},
"ipVersion": {
"type": [
"null",
"number"
]
},
"meetsMinimumMtu": {
"type": [
"boolean",
"null"
]
},
"minimumMtuForVersion": {
"type": [
"null",
"number"
]
},
"mssBytes": {
"type": [
"null",
"number"
]
},
"mssWithoutTimestamps": {
"type": [
"null",
"number"
]
},
"mtu": {
"type": [
"null",
"number"
]
},
"notChecked": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"payloadEfficiencyPercent": {
"type": [
"null",
"number"
]
},
"reasons": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"source": {
"type": [
"null",
"string"
]
},
"summary": {
"type": [
"null",
"string"
]
},
"tcpHeaderBytes": {
"type": [
"null",
"number"
]
},
"tunnel": {
"type": [
"null",
"string"
]
},
"tunnelNote": {
"type": [
"null",
"string"
]
},
"tunnelOverheadBytes": {
"type": [
"null",
"number"
]
},
"udpPayloadMax": {
"type": [
"null",
"number"
]
},
"verdict": {
"type": [
"null",
"string"
]
}
},
"type": "object"
},
"type": {
"type": "string"
}
},