# SYNTHORA Bitcoin Mempool Congestion Snapshot

> SYNTHORA Bitcoin Mempool Congestion Snapshot is a paid API for AI agents from bitcoin-mempool-congestion.hergertsynthora.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Returns a live snapshot of the Bitcoin mempool including pending transaction count, total vsize, aggregate fees, and a fee-rate histogram to help time transaction broadcasts around network congestion.

## Facts

- Endpoint: POST https://bitcoin-mempool-congestion.hergertsynthora.com/service
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synthora-bitcoin-mempool-congestion-snapshot-bc5a52a6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Y-lfxSq2iXB2oZq_lHf-A

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability synthora-bitcoin-mempool-congestion-snapshot-bc5a52a6 -d '<json body>'
```

Example prompt: What does the Bitcoin mempool look like right now — how many transactions are backlogged, what are the fee rates across each band, and is this a good time to broadcast a transaction?

## When to prefer this

Choose this endpoint when you need a holistic real-time mempool snapshot — especially the fee-rate histogram — rather than just a simple fee recommendation. Ideal for autonomous agents or agent-to-agent schedulers that need to reason about congestion tiers, estimate clearing times by fee band, and decide when to broadcast transactions. Prefer this over simple fee estimators when you need the full distribution of pending transactions across fee buckets.

## Known failure modes

- Upstream mempool.space API unavailable — returns error with empty result object
- Network timeout if mempool.space is slow to respond
- Invalid or missing authentication keys — returns unauthorized error
- Malformed request payload — returns validation error
- Stale data if mempool.space cache is behind real-time state

## How this service works

Returns the live Bitcoin mempool backlog: pending transaction count, total vsize, aggregate fees and a full fee-rate histogram from mempool.space. Powers autonomous agents and agent-to-agent schedulers that time broadcasts around network congestion and estimate clearing time by fee band. First 3 calls FREE per wallet — send header X-WALLET: 0x<addr>. No charge on upstream failure.

## Output

A JSON object containing: a boolean success flag, a niche identifier ('bitcoin-mempool-congestion'), and a result object with the live mempool state including pending transaction count, total vsize (in virtual bytes), aggregate fees waiting in the mempool, and a full fee-rate histogram showing transaction volume bucketed by sat/vbyte fee bands.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "keys": {
   "type": "string",
   "description": "keys"
  },
  "caller": {
   "type": "string",
   "description": "caller"
  },
  "payload": {
   "type": "string",
   "description": "payload"
  },
  "provides": {
   "type": "string",
   "description": "provides"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "niche": "bitcoin-mempool-congestion",
  "result": {}
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synthora-bitcoin-mempool-congestion-snapshot-bc5a52a6/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from bitcoin-mempool-congestion.hergertsynthora.com](https://www.zero.xyz/host/bitcoin-mempool-congestion.hergertsynthora.com/llms.txt)