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ExchangeRebel — pay-per-call APIs for AI agents (x402 on Solana)

by com.exchangerebel
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books_isbn

Book metadata by ISBN (Open Library, metadata only). $0.005 per call — USDC on Solana via x402 (over MCP: call without payment to get the PaymentRequired challenge, then retry with the payment at _meta["x402/payment"]). HTTP equivalent: GET https://exchangerebel.com/toll/books/isbn/{isbn}.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
isbnYesISBN-10 or ISBN-13 (hyphens allowed)

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observed

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