opencode-plugin

opencode-plugin-bitplan

gateway.bitplan.dev as a provider inside OpenCode, paid from your BRC-100 wallet. Every model on Vercel AI Gateway and OpenRouter, no API key: the wallet signs a bearer token, and when the gateway asks for payment (HTTP 402) the wallet pays exactly what the call needs and the request is retried with the proof.

The plugin never sees a private key. Identity, the token signature and the payment are wallet calls over the local BRC-100 JSON API, the same calls the bitplan gateway CLI command makes.

Requirements

• OpenCode (a version whose plugin package exposes the auth, provider and config hooks; developed against @opencode-ai/plugin 1.18).
• A running BRC-100 wallet on this machine. BSV Desktop serves the JSON API on 127.0.0.1:3321, which is where the plugin looks by default.

Install

Add the plugin to opencode.json (project) or ~/.config/opencode/opencode.json (global). OpenCode installs npm plugins itself at startup.

{
  "$schema": "https://opencode.ai/config.json",
  "plugin": ["opencode-plugin-bitplan"]
}

Then connect the wallet once:

/connect  →  BitPlan Gateway  →  Connect BRC-100 wallet

Approve the signature request in the wallet. OpenCode stores the resulting 24-hour token in its auth store (~/.local/share/opencode/auth.json) and the plugin re-signs it through the wallet before it expires. Pick a model with /models; recommended models are marked with a star.

The first call on a fresh account answers 402. The plugin pays the challenge from the wallet (the wallet asks for approval) and retries the same request once. Unused reserve stays on the account as credits. You can also fund the account by sending BSV to its paymail (bitplan gateway credits prints it) or deposit a larger amount with bitplan gateway deposit.

Configuration

Every option is optional. Pass them as the second element of the plugin entry:

{
  "$schema": "https://opencode.ai/config.json",
  "plugin": [
    [
      "opencode-plugin-bitplan",
      {
        "walletUrl": "http://127.0.0.1:3321",
        "gatewayUrl": "https://gateway.bitplan.dev",
        "byok": ["opencode-go"],
        "maxOutputTokens": 8192
      }
    ]
  ]
}

Option	Default	Meaning
walletUrl	see below	BRC-100 JSON API endpoint. https, or http on localhost only.
gatewayUrl	https://gateway.bitplan.dev	Gateway origin.
byok	[]	Gateway BYOK provider ids you have stored a key for (opencode, opencode-go). Their byok_only models are listed only when named here; without the stored key the gateway refuses the call.
maxOutputTokens	8192	Output limit advertised for every model. The gateway sizes its per-call hold by max_tokens, so a smaller value keeps holds small.

The wallet endpoint is resolved in this order, first match wins: the walletUrl option, the BITPLAN_WALLET_URL environment variable, walletUrl in ~/.bitplan/config.json (shared with the bitplan CLI), then http://127.0.0.1:3321. A source that is present but wrong is an error; it is never skipped in favour of the next one.

Provider settings from opencode.json still apply. Anything under provider.bitplan (for example options.timeout, a whitelist, or a model override) is merged on top of what the plugin injects.

What the plugin does

• Registers provider bitplan ("BitPlan Gateway") on @ai-sdk/openai-compatible with base URL https://gateway.bitplan.dev/v1, and fills its model list from GET /v1/models: language models only, no image models, no BYOK-only models unless configured, recommended models first, with context windows and USD-per-million prices (markup included) mapped into OpenCode's model shape.
• Adds two connect methods: Connect BRC-100 wallet (the wallet signs; nothing is typed) and Paste a gateway token for a token minted elsewhere, for example with bitplan gateway token.
• Sends every request with Authorization: Bearer <current token> and x-gateway-deposit: exact, refreshing the token through the wallet 30 minutes before its 24-hour expiry. If the wallet is not running, a token that is still valid keeps working; once it has expired the error says what to do.
• On 402, reads the x402 v2 PAYMENT-REQUIRED (scheme exact on BSV), pays amount sats to payTo with createAction, and repeats the identical request once with PAYMENT-SIGNATURE. A second 402, a wallet refusal, or insufficient funds surface as a clear error with the amount and the account's paymail; nothing is paid twice.
• Never logs the token, a signature, or a key.

Without the plugin

Any OpenAI-compatible client works with a static token. Mint one with the CLI and put it in the environment:

export BITPLAN_GATEWAY_TOKEN="$(npx bitplan gateway token)"

{
  "$schema": "https://opencode.ai/config.json",
  "provider": {
    "bitplan": {
      "npm": "@ai-sdk/openai-compatible",
      "name": "BitPlan Gateway",
      "options": {
        "baseURL": "https://gateway.bitplan.dev/v1",
        "apiKey": "{env:BITPLAN_GATEWAY_TOKEN}"
      },
      "models": {
        "anthropic/claude-opus-4.8": { "name": "Claude Opus 4.8" },
        "spacexai/grok-4.6": { "name": "Grok 4.6" }
      }
    }
  }
}

Model ids come from GET https://gateway.bitplan.dev/v1/models (or npx bitplan gateway models). The token lasts 24 hours and this setup cannot pay a 402, so keep the account funded with npx bitplan gateway deposit or by paymail.

Develop

bun install
bun run --cwd packages/opencode-plugin typecheck
bun run --cwd packages/opencode-plugin build
bun test packages/opencode-plugin

Tests stub the wallet and the network; nothing is signed with a real key and no transaction is broadcast.

License

MIT