Pre-sign transaction review
Pre-sign transaction review. Send a base64 transaction (or an already parsed one) and get back what it actually does: the programs it invokes, the authorities it hands over, and the risk flags a wallet should show the user before they approve.
Not tested: has real-world effectsour last check, 2026-09-24
0 of 0checks answered this week
n/amedian answer time
n/alisted price per call
n/aprice 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
POST https://api.solsentry.app/x402/v1/tx-preview
| Category | Market data |
|---|---|
| Provider host | api.solsentry.app |
| Networks | solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| Payment schemes | exact |
| Self-reported calls, 30 days | 4 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
We never call tools that send, buy, move money or file anything, not even without paying.
Example input (from the provider)
{
"body": {
"tx_base64": "<base64-encoded transaction>"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"properties": {
"parsed_tx": {
"description": "Alternative: an already parsed transaction",
"type": "object"
},
"tx_base64": {
"description": "Base64-encoded transaction",
"type": "string"
}
},
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"decode_ok": {
"type": "boolean"
},
"detectors_run": {
"items": {
"type": "string"
},
"type": "array"
},
"findings": {
"items": {
"properties": {
"detail": {
"type": "object"
},
"detector": {
"type": "string"
},
"severity": {
"type": "string"
},
"summary": {
"type": "string"
}
},
"type": "object"
},
"type": "array"
},
"latency_ms": {
"type": "number"
},
"provenance": {
"description": "Freshness of this answer: when it was fetched/computed (UTC), whether it came from a cache layer, and the Solana slot it reflects when the underlying data source exposes one (null otherwise).",
"properties": {
"as_of_slot": {
"type": [
"integer",
"null"
]
},
"cached": {
"type": "boolean"
},
"fetched_at": {
"description": "ISO-8601 UTC timestamp",
"type": "string"
},
"source": {
"type": [
"string",
"null"
]
}
},
"type": "object"
},
"risk_score": {
"description": "0-100 aggregate",
"type": "integer"
},
"verdict": {
"description": "'block' | 'warn' | 'safe'",
"type": "string"
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}