Bluepages

800K+ verified Ethereum address <> Twitter/X mappings, plus Farcaster.

Setup

Requires the Bluepages MCP server: npx -y github:bluepagesdoteth/bluepages-mcp or direct API calls (see below). The MCP server is the recommended way to use Bluepages.

Authentication

Requires one of these env vars:

• BLUEPAGES_API_KEY (recommended) — 20% cheaper, 2x rate limits.
• PRIVATE_KEY — Ethereum private key for x402 pay-per-request (USDC on Base).

Security note: Never use a main wallet key. Use a dedicated, funded-only-as-needed agent wallet if providing PRIVATE_KEY.

With a private key, you can either pay per request via x402 or purchase a BLUEPAGES_API_KEY using the get_api_key and purchase_credits MCP tools.

Without a private key, the user must get an API key at bluepages.fyi/api-keys and set BLUEPAGES_API_KEY.

Tools (quick reference)

Tool	Cost	Description
check_address	1 credit ($0.001)	Check if address has data
check_twitter	1 credit ($0.001)	Check if Twitter handle has data
get_data_for_address	50 credits ($0.05)	Full identity data for address (free if not found)
get_data_for_twitter	50 credits ($0.05)	Full identity data for handle (free if not found)
batch_check	40 credits ($0.04)	Check up to 50 items at once
batch_get_data	40 credits/found item	Data for up to 50 items (x402: $2.00 flat/batch)
batch_check_streaming	same as batch_check	For large lists (100+), shows progress
batch_get_data_streaming	same as batch_get_data	For large lists (100+), shows progress
check_credits	free	Check remaining credits (API key only)
set_credit_alert	free	Set low-credit warning threshold (API key only)
get_api_key	free	Get/create API key via wallet signature
purchase_credits	$5–$600 USDC	Buy credits via x402 (PRIVATE_KEY only)

Input format

• Addresses: 0x-prefixed, 42-char hex. Case-insensitive.
• Twitter handles: With or without @.

Cost-saving workflow

• Single lookups: check_address/check_twitter first (1 credit), then get_data_* only if found (50 credits). Skipping the check wastes credits on misses.
• Batch lookups: Always two-phase — batch_check then batch_get_data on found items only. This saves ~90% vs fetching everything blind.
• Large lists (100+): Use _streaming variants for progress updates.

Rate limits

• API Key: 60 req/min
• x402: 30 req/min
• Batch: max 50 items per request

Alternative: Direct HTTP API

If MCP is unavailable, call the API directly. Auth depends on your setup:

• API key: pass X-API-KEY header
• Private key (x402): endpoints return a 402 with payment details; sign and resend with X-PAYMENT header

# With API key
curl "https://bluepages.fyi/check?address=0x..." -H "X-API-KEY: your-key"
curl "https://bluepages.fyi/data?address=0x..." -H "X-API-KEY: your-key"

# Batch check
curl -X POST "https://bluepages.fyi/batch/check" \
  -H "X-API-KEY: your-key" -H "Content-Type: application/json" \
  -d '{"addresses": ["0x...", "0x..."]}'

Full API docs: bluepages.fyi/docs