machinemint-native-x402-production.up.railway.app
Check an unsigned Base mainnet transaction before signing or broadcasting. Simulates with eth_call, estimates gas, checks sender balance and target bytecode, decodes supported token transfers and approvals, flags unlimited approvals and suspicious transaction shapes, and returns PASS, REVIEW, or FAIL. Never signs or broadcasts.
Offering
- Provider
- machinemint-native-x402-production.up.railway.app
- Method
- GET
- Offering type
- Api Endpoint
- Transport type
- http
- Category
- Blockchain And Crypto
- Delivery
- Not provided
- Pricing model
- Not provided
- x402 version
- 2
Endpoint context
- URL
https://machinemint-native-x402-production.up.railway.app/v1/base-preflight- MIME type
- application/json
- First seen
- 2026-10-16T01:52:52.778Z
- Last seen
- Tags
- None supplied
Payment pricing
x402 payment terms are the authoritative price for calling this endpoint.
- Payment option 1
- 0.01 USDC
Atomic price: 10000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Raw x402 terms
[
{
"scheme": "exact",
"network": "eip155:8453",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount": "10000",
"payTo": "0xe43e47Dd6b779fE9e591586A3e1cBA00C2f36C80"
}
]Observed health
- Status
- Healthy
- Latest latency
- 114 ms
- Average latency
- 379 ms
- HTTP status
- 402
- Last checked
- Reachability
- 100% over 14 checks
Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.
Input schema
{
"type": "object",
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"type": "string",
"enum": [
"GET"
]
},
"queryParams": {
"type": "object",
"additionalProperties": false,
"description": "Optional GET query parameters. Omit all fields to request the deterministic marketplace-verification sample.",
"properties": {
"chain": {
"type": "string",
"enum": [
"base",
"base-mainnet"
],
"default": "base"
},
"from": {
"type": "string",
"pattern": "^0x[0-9a-fA-F]{40}$",
"description": "Sender wallet for the unsigned transaction."
},
"to": {
"type": "string",
"pattern": "^0x[0-9a-fA-F]{40}$",
"description": "Target contract or account."
},
"value": {
"type": [
"string",
"integer"
],
"default": "0",
"description": "Native value in wei."
},
"data": {
"type": "string",
"pattern": "^0x(?:[0-9a-fA-F]{2})*$",
"default": "0x",
"description": "0x-prefixed calldata."
}
}
}
},
"required": [
"type",
"method"
],
"additionalProperties": false
}Output schema
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"additionalProperties": false,
"description": "Optional GET query parameters. Omit all fields to request the deterministic marketplace-verification sample.",
"properties": {
"chain": {
"default": "base",
"enum": [
"base",
"base-mainnet"
],
"type": "string"
},
"data": {
"default": "0x",
"description": "0x-prefixed calldata.",
"pattern": "^0x(?:[0-9a-fA-F]{2})*$",
"type": "string"
},
"from": {
"description": "Sender wallet for the unsigned transaction.",
"pattern": "^0x[0-9a-fA-F]{40}$",
"type": "string"
},
"to": {
"description": "Target contract or account.",
"pattern": "^0x[0-9a-fA-F]{40}$",
"type": "string"
},
"value": {
"default": "0",
"description": "Native value in wei.",
"type": [
"string",
"integer"
]
}
},
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"action": {
"type": "object"
},
"canonical_endpoint": {
"type": "string"
},
"chain": {
"type": "object"
},
"gas": {
"type": "object"
},
"provenance": {
"type": "object"
},
"reason_codes": {
"items": {
"type": "string"
},
"type": "array"
},
"request_mode": {
"enum": [
"provided_transaction",
"marketplace_verification_sample"
],
"type": "string"
},
"risks": {
"items": {
"type": "object"
},
"type": "array"
},
"sender": {
"type": "object"
},
"service": {
"const": "machinemint.evm.preflight"
},
"simulation": {
"type": "object"
},
"target": {
"type": "object"
},
"transaction": {
"type": "object"
},
"verdict": {
"enum": [
"PASS",
"REVIEW",
"FAIL"
],
"type": "string"
}
},
"required": [
"service",
"verdict"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}