{"service":"agenttoll.dev","endpoint":"https://agenttoll.dev/paid/academic/citations","method":"POST","protocol":"x402","price_usd":"0.03","network":"eip155:8453","facilitator":"https://api.cdp.coinbase.com/platform/v2/x402","message":"This is an x402-paid API endpoint. Send a POST request with JSON to receive the 402 payment challenge, then retry with a signed payment.","tool":{"name":"citation_graph","description":"Get citation graph for a paper. Forward citations (who cited this) or backward (references). Returns paper IDs, titles, contexts.","buyer_value":"Pay $0.03 for Get citation graph for a paper. Forward citations (who cited this) or backward (references). Returns paper IDs, titles, contexts.","input":{"paperId":"string paper ID or DOI","direction":"optional: forward or backward"},"example":{"paperId":"10.1145/3442188.3445922","direction":"forward"},"sample_output":"JSON with source-backed fields, response metadata, and decision/readout fields where the endpoint is a brief.","discovery_queries":["citation graph","citation graph x402","paid MCP tool","paid data API for AI agents"],"docs":"https://agenttoll.dev/tools/citation_graph"}}