# SYNTHORA Bitcoin Fee Estimator

> SYNTHORA Bitcoin Fee Estimator is a paid API for AI agents from api.hergertsynthora.com, paid per call via x402, $0.03/call, status unknown (last checked 2026-09-15).

Returns current Bitcoin transaction fee tiers (fastest/half-hour/hour/economy/minimum) in sat/vB plus current block height, sourced from mempool.space.

## Facts

- Endpoint: POST https://api.hergertsynthora.com/v1/bitcoin-fees
- Price: $0.03/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synthora-bitcoin-fee-estimator-ea691607
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_jH6u3OZoNQKk3mLDmw7dr

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-fee-estimator-ea691607 -d '<json body>'
```

Example prompt: What are the current Bitcoin transaction fee tiers right now — specifically the fastest, half-hour, one-hour, economy, and minimum rates in sat/vB, plus the current block height?

## When to prefer this

Use this endpoint when you need a quick, keyless lookup of Bitcoin fee tiers across all confirmation speed categories without setting up your own mempool.space integration. Ideal for agents automating Bitcoin transactions, wallets, or dashboards that need current sat/vB rates without API key management.

## Known failure modes

- mempool.space upstream outage causing stale or missing fee data
- network timeout if the upstream API is slow
- invalid or malformed input may return an error
- fees may lag real-time mempool conditions by a few seconds

## How this service works

SYNTHORA bitcoin-fees: Bitcoin fee tiers in sat/vB (fastest/half-hour/hour/economy/minimum) plus current block height. Source: mempool.space public API, keyless. Bitcoin only.

## Output

Returns a structured response containing Bitcoin fee rates in sat/vB for five confirmation speed tiers (fastest/half-hour/hour/economy/minimum) and the current Bitcoin block height, sourced live from mempool.space.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "input": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synthora-bitcoin-fee-estimator-ea691607/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.hergertsynthora.com](https://www.zero.xyz/host/api.hergertsynthora.com/llms.txt)