# Vextorium Solana Signature Verify

> Vextorium Solana Signature Verify is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-11).

Verifies a Solana Ed25519 signature against a message and public key, returning validity, signer address, algorithm used, and message byte length.

## Facts

- Endpoint: POST https://api.vextorium.com/v1/solana-signature-verify?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/vextorium-solana-signature-verify-b765cdc2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_HqjCd1X2BU2whcTnX5azX

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability vextorium-solana-signature-verify-b765cdc2 -d '<json body>'
```

Example prompt: Can you verify this Solana signature — the message is 'Hello Vextorium', the signature is '5J3mBbAH...XYZ', and the public key is 'CGoFePajwf11M2VpQjp17p1bLGZ5BrTM2yFJxnFHZTDe'?

## When to prefer this

Choose this endpoint when you need to cryptographically verify a Solana Ed25519 signature server-side without running a local Solana node or library. It is ideal for agents that need to authenticate Solana wallet ownership, validate signed challenges, or confirm data integrity in a pay-per-call, infrastructure-free way. Prefer it over EVM-specific signature verifiers when dealing with Solana wallets.

## Known failure modes

- Invalid or malformed base58 public key returns an error or valid:false
- Signature string not matching expected encoding format causes a parse error
- Message/signature/public_key mismatch results in valid:false
- Missing required fields (message, signature, public_key) returns a 400 bad request
- Network or service downtime returns a 5xx error

## How this service works

Verify an Ed25519 Solana signature (Phantom/Solflare signMessage) for a message and public key; signature in base58, base64 or hex. Local computation.

## Output

Returns a JSON object with: `valid` (boolean indicating whether the signature is valid), `address` (the Solana wallet address derived from the public key), `algorithm` (the cryptographic algorithm used, e.g. 'Ed25519'), and `bytes_message` (the byte length of the signed message). If invalid, `valid` is false.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "required": [
      "message",
      "signature",
      "public_key"
     ],
     "properties": {
      "message": {
       "type": "string"
      },
      "signature": {
       "type": "string"
      },
      "public_key": {
       "type": "string"
      }
     }
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": [
      "object",
      "null"
     ],
     "properties": {
      "valid": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "address": {
       "type": [
        "string",
        "null"
       ]
      },
      "algorithm": {
       "type": [
        "string",
        "null"
       ]
      },
      "bytes_message": {
       "type": [
        "number",
        "null"
       ]
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "valid": true,
  "address": "CGoFePajwf11M2VpQjp17p1bLGZ5BrTM2yFJxnFHZTDe",
  "algorithm": "Ed25519",
  "bytes_message": 15
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/vextorium-solana-signature-verify-b765cdc2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.vextorium.com](https://www.zero.xyz/host/api.vextorium.com/llms.txt)