# FAQ

<details>

<summary>Do I need an API key or account?</summary>

No. SolProbe has no keys, accounts, or signup. Your wallet is your identity and payment method — fund it with USDC on Base or Solana and call any endpoint. See [Getting started](/getting-started.md).

</details>

<details>

<summary>Which chains' tokens can SolProbe scan?</summary>

SolProbe scans **Solana** tokens. `token_address` must be a Solana SPL **mint** (base58, 32–44 chars) — not an EVM `0x…` address and not a ticker symbol. (Payment can be made on Base *or* Solana, but the token being analyzed is always Solana.)

</details>

<details>

<summary>What's the difference between paying on Base and Solana?</summary>

Same price either way. Base settlement is gasless (you sign an EIP-3009 permit and the facilitator pays gas); Solana uses the x402 exact-SVM scheme. Pick whichever rail your wallet is funded on. See the [Payment guide](/reference/payment-guide.md).

</details>

<details>

<summary>Is the A–F grade generated by an LLM?</summary>

No. Structural facts (authorities, holder concentration, LP status) and the resulting grade are computed deterministically in scanner code from live on-chain data. The grade is reproducible. LLMs are only used for the plain-English narrative summaries.

</details>

<details>

<summary>What happens if a data source is down?</summary>

SolProbe degrades gracefully and **never returns a hard error to a caller**. It lowers `data_confidence` / `data_quality` and lists what's missing in `missing_fields`, so you always know how much to trust a result.

</details>

<details>

<summary>Will I be double-billed across channels?</summary>

No. [x402](/access-paths/x402.md) and [Virtuals ACP](/access-paths/virtuals-acp.md) are independent channels at the same prices — ACP buyers pay through escrow, x402 buyers pay per call, and ACP traffic bypasses the x402 paywall internally.

</details>

<details>

<summary>How do I get a refund on a failed trade?</summary>

The [trade](/reference/api-reference/trade.md) fee is charged **only on commit**. If `/trade/execute` doesn't CONFIRM, the x402 payment is cancelled (HTTP `422`) — you're not charged for a trade that didn't execute.

</details>

<details>

<summary>Where do I report issues or ask questions?</summary>

Reach out on X — [@solprobe](https://x.com/solprobe) — or open an issue in [github.com/solprobe/solprobe-skills](https://github.com/solprobe/solprobe-skills).

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