Crypto pay links and API for people and AI agents. BTC, Lightning, USDC, USDT, EURC, SOL, ETH.
Setup
Choose your client, copy the config, then fill in any required environment variables.
claude mcp add --transport http send21 https://send21.io/mcp --header 'Authorization: <AUTHORIZATION>'~/.codex/config.toml
[mcp_servers.send21]
url = "https://send21.io/mcp"
http_headers = { Authorization = "<AUTHORIZATION>" }
# codex mcp add send21 --url https://send21.io/mcp~/.cursor/mcp.json
{
"mcpServers": {
"send21": {
"url": "https://send21.io/mcp",
"headers": {
"Authorization": "<AUTHORIZATION>"
}
}
}
}.vscode/mcp.json
{
"servers": {
"send21": {
"type": "http",
"url": "https://send21.io/mcp",
"headers": {
"Authorization": "<AUTHORIZATION>"
}
}
}
}~/.gemini/settings.json
{
"mcpServers": {
"send21": {
"httpUrl": "https://send21.io/mcp",
"headers": {
"Authorization": "<AUTHORIZATION>"
}
}
}
}claude_desktop_config.json · Customize › Connectors › Add custom connector
{
"mcpServers": {
"send21": {
"command": "npx",
"args": [
"-y",
"mcp-remote",
"https://send21.io/mcp",
"--header",
"Authorization:<AUTHORIZATION>"
]
}
}
}.trae/mcp.json
{
"mcpServers": {
"send21": {
"url": "https://send21.io/mcp",
"headers": {
"Authorization": "<AUTHORIZATION>"
}
}
}
}