bridge-watch

Bridge Watch — pay-per-call on-chain address intelligence

Remote MCP endpoint: https://agentsapi.top/mcp (streamable HTTP, JSON-RPC 2.0). Alternative local stdio bridge: npx -y bridge-watch-mcp.

When to use

• "Who is 0x…?" / "Is this address an exchange, a bridge, a scam?"
• "Explain this tx" / "What did this transfer do?"
• "Are these two addresses the same entity?"
• "How much USDC crossed CCTP recently?"

Step 1 — try the free tier first (no wallet, no key)

get_label and list_paid_endpoints are free for 3 calls per IP per day (500/day site-wide). initialize and tools/list are always free.

curl -s https://agentsapi.top/mcp \
  -H 'Content-Type: application/json' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"get_label","arguments":{"address":"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913"}}}'

A X-MCP-Free-Trial: 1 response header means the free tier paid for this call. get_label with no address argument returns a working demo result (USDC on Base) — useful to check connectivity without spending a credit.

Step 2 — when you get HTTP 402

402 is a payment challenge, not an error. It means: free tier exhausted, or the tool is not in the free set. The body carries the full x402 v2 offer (accepts[], payTo, amount, hint).

• Network: Base. Asset: USDC. payTo = 0x381cdbb664608bf7b1dd4f9403a572c1c57332c2
• 1 USDC = 100 credits (creditPerUsdc=100).
• Send the exact USDC amount to payTo on Base, then retry the same request with your own address as a Bearer token: -H 'Authorization: Bearer 0x<YOUR_PAYING_ADDRESS>'
• Credits accumulate on that address and are spent on later calls, so one transfer can fund many calls.

Tools and price

Prices below were read from the live endpoint card (GET https://agentsapi.top/mcp) and are identical to the amounts in the 402 challenge. Do not hardcode them elsewhere — re-read the card if in doubt.

tool	credits	USDC	what it returns
get_label	1	0.01	labels / entity attribution for one address
list_paid_endpoints	1	0.01	the current paid REST endpoint catalogue
query_alerts	1	0.01	recent monitoring alerts
alert_stats	1	0.01	alert volume aggregates
explain_transaction	2	0.02	human-readable decoding of one tx
track_cctp	3	0.03	CCTP cross-chain USDC flows
detect_cluster	5	0.05	addresses controlled by the same entity

Practical notes

• Only tools/call is billed. initialize, tools/list, resources/*, prompts/* and other protocol methods are free.
• If you are behind a shared NAT, the 3/day free quota may already be consumed by someone else on the same IP — go straight to step 2.
• Coverage changes over time. Use GET https://agentsapi.top/statusz (labels.count) for the current number of labelled addresses; never quote a remembered number.
• Machine-readable discovery docs: /.well-known/x402, /openapi.json, /llms.txt.