# Crypto Market Pulse & Base USDC Stats – Base64 Text Endpoint

> Crypto Market Pulse & Base USDC Stats – Base64 Text Endpoint is a paid API for AI agents from cryptopulse.pythonanywhere.com, paid per call via x402, $0.0005/call, status unknown (last checked 2026-10-11).

Returns a Base64-encoded JSON snapshot of live crypto prices (BTC, ETH, SOL, USDC), Base mainnet chain stats, and USDC transfer analytics, paid per-call via x402 USDC on Base.

## Facts

- Endpoint: GET https://cryptopulse.pythonanywhere.com/text/base64?utm_source=zero.xyz
- Price: $0.0005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/crypto-market-pulse-base-usdc-stats-base64-text-endpoint-d047f9f6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_avuviLcovYm368WooNqHJ

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 crypto-market-pulse-base-usdc-stats-base64-text-endpoint-d047f9f6
```

Example prompt: Pull me the latest BTC, ETH, SOL, and USDC prices with their 24-hour changes, plus the current Base mainnet block height and gas price — give it to me as a Base64-encoded JSON snapshot I can drop into my data pipeline.

## When to prefer this

Choose this endpoint when you need a single no-signup, no-API-key call that combines live OKX crypto prices, Base mainnet chain health, and real USDC on-chain transfer analytics in one portable Base64-encoded payload — especially useful for agent pipelines, LLM post-processing workflows, or DeFi dashboards that consume encoded data blobs and want to pay micropayments per call via x402 rather than managing subscriptions.

## Known failure modes

- HTTP 402 returned if payment signature is missing or invalid — must include PAYMENT-SIGNATURE header after completing x402 challenge
- Stale or delayed market data if OKX feed is temporarily unavailable
- Base RPC errors if mainnet node is congested or unreachable
- Malformed Base64 if upstream JSON assembly fails
- Rate limiting or server errors from pythonanywhere.com hosting constraints
- Empty or null analytics fields if no USDC transfers occurred in the sampled block range

## How this service works

Pay-per-call API for AI agents, settled in USDC on Base mainnet (eip155:8453) via the x402 protocol - no API keys, no signup, no subscription. Live crypto market data: BTC, ETH, SOL, USDC (USD Coin) prices with 24h change (source: OKX), Base mainnet chain snapshot (block height, gas price gwei), real-time USDC-on-Base transfer analytics (transfer count, volume, unique senders and recipients over recent blocks), and USDC/ETH wallet balances plus nonce for any address. Agent utility tools: deterministic JSON repair for LLM output (strip code fences, fix trailing commas, single quotes, unquoted keys, balance braces), DNS A/AAAA lookup, and URL extraction from arbitrary text. Every endpoint returns HTTP 402 with an x402 payment challenge in USDC on Base; pay with any wallet and retry with the PAYMENT-SIGNATURE header. MCP server at /mcp (streamable HTTP, 6 pay-per-call tools). Ideal for crypto portfolios, DeFi dashboards, market analysis agents, data pipelines, and LLM post-processing.

## Output

A Base64-encoded JSON object containing: current USD prices and 24h percentage changes for BTC, ETH, SOL, and USDC (sourced from OKX); Base mainnet chain stats (chainId 8453, block height, gas price in gwei); USDC transfer analytics over recent blocks (count, volume, unique senders/recipients); optionally USDC and ETH wallet balances and nonce for a given address; and a servedAt Unix timestamp. Delivered after x402 USDC micropayment on Base mainnet.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "chain": {
   "chainId": 8453,
   "network": "base-mainnet",
   "blockHeight": 21000000,
   "gasPriceGwei": 0.05
  },
  "market": {
   "solana": {
    "usd": 150,
    "usd_24h_change": -0.5
   },
   "bitcoin": {
    "usd": 60000,
    "usd_24h_change": 1.5
   },
   "ethereum": {
    "usd": 3000,
    "usd_24h_change": 2
   },
   "usd-coin": {
    "usd": 1,
    "usd_24h_change": 0
   }
  },
  "servedAt": 1755430000
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/crypto-market-pulse-base-usdc-stats-base64-text-endpoint-d047f9f6/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from cryptopulse.pythonanywhere.com](https://www.zero.xyz/host/cryptopulse.pythonanywhere.com/llms.txt)