Marketplace · API · x402

api.prereason.com/api/btc/etf

Spot Bitcoin ETF flows. Daily net flows, cumulative flow, AUM with per-fund breakdown (IBIT, FBTC, GBTC). Spot Bitcoin ETF flow data for research agents. A paid call serves today or any ?date= on record.

Endpoint	`https://api.prereason.com/api/btc/etf`
Trust	✓ Verified callable · 100% uptime over 1 checks · ~980 ms
Pricing	Pay per call with x402, no account. Call it to get an exact quote before paying.
network	eip155:8453
scheme	exact
pay to	0xa499f6F6ab97ba87DB2e1fD7a1e3534125b60018
method	GET
last updated	2026-11-09T22:57:33.829Z

Use it

Call it (an x402 client pays automatically)

curl -i https://api.prereason.com/api/btc/etf
# 402 reply -> sign PAYMENT-REQUIRED with an x402 client (e.g. @x402/fetch) -> retry with PAYMENT-SIGNATURE

This listing as JSON

curl https://aipaygen.com/v1/catalog/api/x402-06f6230645a89dfc

Search the whole marketplace from your agent (MCP)

{
  "mcpServers": {
    "aipaygen": {
      "url": "https://aipaygen.com/mcp"
    }
  }
}

Stock, ETF and index quotes (AIPayGen)
API$0.001/call

api.prereason.com/api/btc/etf

Use it

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