cURL

curl is the fastest way to poke at the Bitcoin Core JSON-RPC API on TheRPC: you can check the chain tip, look up a block or transaction, or broadcast a signed transaction without installing a single library — ideal for testing an endpoint, debugging a failing call, or scripting a quick UTXO check from the shell. Every call is an HTTP POST with Content-Type: application/json to https://bitcoin.therpc.io/YOUR_API_KEY, where YOUR_API_KEY is the key from your TheRPC dashboard. Bitcoin Core speaks the legacy JSON-RPC 1.0 envelope — {"jsonrpc":"1.0","id":"therpc","method":...,"params":[...]} — with a string id and positional params (an ordered array, never named keys), so argument order matters on every method.

Authentication is just your TheRPC key in the URL path — https://bitcoin.therpc.io/YOUR_API_KEY. If you prefer to keep the key out of the path, send it instead as Authorization: Bearer YOUR_API_KEY against the bare host; both forms are accepted. Either way, the request must be a POST carrying the Content-Type: application/json header — a GET or a missing content type will be rejected before it ever reaches a Bitcoin node.

Basic Usage

1curl -X POST \
2  -H "Content-Type: application/json" \
3  --data '{"jsonrpc":"1.0","id":"therpc","method":"getblockchaininfo","params":[]}' \
4  https://bitcoin.therpc.io/YOUR_API_KEY

Authentication

1curl -X POST \
2  -H "Content-Type: application/json" \
3  -H "Authorization: Bearer YOUR_API_KEY" \
4  --data '{"jsonrpc":"1.0","id":"therpc","method":"getblockcount","params":[]}' \
5  https://bitcoin.therpc.io/YOUR_API_KEY

Common Operations

1curl -X POST \
2  -H "Content-Type: application/json" \
3  --data '{"jsonrpc":"1.0","id":"therpc","method":"getblock","params":["000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f",1]}' \
4  https://bitcoin.therpc.io/YOUR_API_KEY

1curl -X POST \
2  -H "Content-Type: application/json" \
3  --data '{"jsonrpc":"1.0","id":"therpc","method":"getrawtransaction","params":["4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b",true]}' \
4  https://bitcoin.therpc.io/YOUR_API_KEY

Broadcasting

1curl -X POST \
2  -H "Content-Type: application/json" \
3  --data '{"jsonrpc":"1.0","id":"therpc","method":"sendrawtransaction","params":["0200000001abcd...00000000"]}' \
4  https://bitcoin.therpc.io/YOUR_API_KEY