# Saylor Innovations Bitcoin Fee Estimates

> Saylor Innovations Bitcoin Fee Estimates is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-30).

Returns Bitcoin transaction fee estimates in sat/vByte for 1–144 block targets, plus recommended fast/standard/economy tiers, mempool size, and congestion level.

## Facts

- Endpoint: GET https://saylorinnovations.com/api/explorer/bitcoin/fees?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/saylor-innovations-bitcoin-fee-estimates-9f867dfa
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_d3zbNQSITWNJL9apnnfoF

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 saylor-innovations-bitcoin-fee-estimates-9f867dfa
```

Example prompt: What are the current Bitcoin fee estimates — give me the fast, standard, and economy sat/vByte rates, and let me know if the mempool is congested right now.

## When to prefer this

Use this endpoint when you need structured Bitcoin fee recommendations across multiple confirmation-speed tiers in a single call, including mempool congestion context. It is especially useful for agents orchestrating Bitcoin transactions that need to dynamically select an appropriate fee rate based on urgency and network conditions, without building their own mempool monitoring infrastructure.

## Known failure modes

- Upstream Bitcoin node or fee-estimation data source is unavailable, returning an error or stale data
- Network timeouts if the mempool is unusually large and query takes too long
- Invalid or unexpected response format if the provider's schema changes
- x402 payment failure if USDC balance or payment header is missing, blocking the request

## How this service works

Bitcoin fee estimates in sat per vByte for 1 to 144 block targets, with fast, standard and economy picks, mempool size and congestion level.

## Output

A JSON object containing: the blockchain identifier (chain), current block height, an array of fee estimates in sat/vByte keyed by block target (1–144), a recommended object with fast/standard/economy picks, mempool size data, a congestion level string, a note with caveats, and the data source attribution.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "json"
    },
    "example": {
     "type": "object",
     "required": [
      "chain",
      "block_height",
      "estimates",
      "recommended",
      "mempool",
      "congestion",
      "note",
      "source"
     ],
     "properties": {
      "note": {
       "type": "string",
       "description": "Caveat or context for reading the result"
      },
      "chain": {
       "type": "string",
       "description": "Blockchain the data is for"
      },
      "source": {
       "type": "string",
       "description": "Data source the values come from"
      },
      "mempool": {
       "type": "object"
      },
      "estimates": {
       "type": "array"
      },
      "congestion": {
       "type": "string"
      },
      "recommended": {
       "type": "object"
      },
      "block_height": {
       "type": "number",
       "description": "Block height"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/saylor-innovations-bitcoin-fee-estimates-9f867dfa/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from saylorinnovations.com](https://www.zero.xyz/host/saylorinnovations.com/llms.txt)