Steem Witness Price Feed (Go)

Go rewrite of the Node.js pricefeed tool for Steem witnesses. It fetches STEEM/USD prices from multiple APIs, averages successful sources, and publishes feed_publish transactions to the blockchain.

Docker image: steemfans/go-pricefeed:latest

Features

• Compatible config.json schema with the Node.js version
• Five price sources: cloudflare, slowapi, coingecko, cryptocompare, coinmarketcap
• CoinMarketCap authentication via X-CMC_PRO_API_KEY header (not query string)
• RPC node failover on broadcast failures
• Fixed average calculation (uses count of successful prices only)
• Single-flight scheduler (skips overlapping cycles)
• Graceful shutdown on SIGINT/SIGTERM

Private Key Requirements

Use your witness account active private key (feed_steem_active_key). This is not the witness block signing key used for block production. The chain requires active or owner authority for feed_publish.

Installation

Docker (recommended)

cp config.example.json config.json
# edit config.json with witness account and active key

docker run -itd \
  --name go-pricefeed \
  -v $(pwd)/config.json:/app/config.json \
  steemfans/go-pricefeed:latest

docker logs -f go-pricefeed

Build from source

go build -o bin/pricefeed ./cmd/pricefeed
./bin/pricefeed -config config.json

Configuration

See config.example.json. Secrets can be set via environment variables when left empty in JSON:

Environment variable	Config field
feed_steem_account	feed_steem_account
feed_steem_active_key	feed_steem_active_key
coinmarketcap_api_key	coinmarketcap_api_key

Differences from Node.js pricefeed

Item	Node.js	Go
Average price	Divides by total exchange slots	Divides by successful fetches only
CoinMarketCap auth	Query parameter	X-CMC_PRO_API_KEY header
Overlapping cycles	Allowed	Skipped (single-flight)
Shutdown	No signal handling	Graceful shutdown

Migration from Node.js pricefeed

1. Reuse your existing config.json
2. Replace Docker image steemfans/pricefeed with steemfans/go-pricefeed
3. No change required for RPC nodes, exchanges, or active key configuration

License

MIT