# Bitcoin Fee Pulse + Address Fingerprint

> Bitcoin Fee Pulse + Address Fingerprint is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.025/call, status unknown (last checked 2026-10-17).

Returns live Bitcoin mempool fee estimates combined with a basic address balance, activity, and contract check for a given Bitcoin address.

## Facts

- Endpoint: GET https://k2so.wrong.systems/api/services/bitcoin-fee-pulse-address-fingerprint?utm_source=zero.xyz
- Price: $0.025/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-17
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/bitcoin-fee-pulse-address-fingerprint-3981c529
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_5_uLhemJHCnbM6Nq3CsFQ

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 bitcoin-fee-pulse-address-fingerprint-3981c529
```

Example prompt: What are the current Bitcoin mempool fees and can you also check if this address 1A1zP1eP5QGefi2DMPTfTL5SLmv7Divf Na looks healthy and active?

## When to prefer this

Choose this endpoint when you need both current Bitcoin mempool fee conditions and a quick fingerprint of a specific Bitcoin address in a single call, rather than making two separate API requests. It is ideal for agents that need to vet a payment counterparty while simultaneously checking whether network fees are reasonable before initiating a transaction.

## Known failure modes

- Mempool.space API unavailable — fee data may be stale or missing
- Invalid or malformed Bitcoin address returns an error or empty address result
- Network timeout causes partial data return
- Address has no on-chain history, yielding low confidence scores
- Payment not completed results in 402 response requiring x402 payment

## How this service works

Cross-verified: Live Bitcoin mempool congestion from mempool.space fee estimates. Combined with base address balance/activity/contract check.

## Output

Returns a structured JSON object with an ok flag, service slug, score, summary, confidence rating, array of strengths, array of risk factors, evidence object with raw data, and a generatedAt ISO-8601 timestamp. The result combines live mempool fee tiers (slow/medium/fast sat/vbyte) with address-level balance and activity signals.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "": {
       "type": "string",
       "description": "Composite input parameter"
      },
      "meta": {
       "enum": [
        "0",
        "1"
       ],
       "type": "string",
       "description": "Set to 1 for free metadata JSON (no payment required)"
      },
      "address": {
       "type": "string",
       "description": "Composite input parameter"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "title": "Bitcoin Fee Pulse + Address Fingerprint paid response",
     "$schema": "https://json-schema.org/draft/2020-12/schema",
     "required": [
      "ok",
      "paid",
      "service",
      "provider",
      "result"
     ],
     "properties": {
      "ok": {
       "type": "boolean"
      },
      "paid": {
       "type": "boolean"
      },
      "result": {
       "type": "object",
       "required": [
        "ok",
        "service"
       ],
       "properties": {
        "ok": {
         "type": "boolean",
         "description": "Handler success"
        },
        "score": {
         "type": "number"
        },
        "service": {
         "type": "string",
         "description": "Service slug"
        },
        "summary": {
         "type": "string"
        },
        "evidence": {
         "type": "object"
        },
        "strengths": {
         "type": "array",
         "items": {
          "type": "string"
         }
        },
        "confidence": {
         "type": "string"
        },
        "generatedAt": {
         "type": "string",
         "description": "ISO-8601 timestamp"
        },
        "riskFactors": {
         "type": "array",
         "items": {
          "type": "string"
         }
        }
       }
      },
      "payment": {
       "type": "object",
       "properties": {
        "code": {
         "type": "string"
        },
        "payer": {
       
… (truncated)
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "paid": true,
  "result": {
   "ok": true,
   "service": "bitcoin-fee-pulse-address-fingerprint"
  },
  "service": "bitcoin-fee-pulse-address-fingerprint",
  "provider": "K-2SO"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/bitcoin-fee-pulse-address-fingerprint-3981c529/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from k2so.wrong.systems](https://www.zero.xyz/host/k2so.wrong.systems/llms.txt)