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Perfect for sentiment analysis and market context in AI conversations.","tags":["AgentFriendly"],"security":[{"bearerAuth":[]}],"responses":{"200":{"description":"Top crypto news headlines","content":{"application/json":{"schema":{"type":"object","properties":{"timestamp":{"type":"integer"},"data":{"type":"array","items":{"type":"string"}}}}}}},"500":{"description":"Internal server error"}}}},"/agentFriendly/ta/{slug}/sma":{"get":{"summary":"Get Simple Moving Average for technical analysis","description":"Returns SMA indicator data optimized for AI trading analysis. Automatically samples to 200 data points for efficient processing while maintaining trend accuracy.","tags":["AgentFriendly"],"parameters":[{"in":"path","name":"slug","required":true,"schema":{"type":"string"},"description":"Asset slug (e.g., bitcoin)"},{"in":"query","name":"window","schema":{"type":"integer","default":5},"description":"SMA window size"},{"in":"query","name":"fetchInterval","schema":{"type":"string","enum":["m1","m5","m15","m30","h1","h2","h6","h12","d1"],"default":"d1"},"description":"Timeframe for price bars"}],"security":[{"bearerAuth":[]}],"responses":{"200":{"description":"SMA data culled to 200 points","content":{"application/json":{"schema":{"type":"object","properties":{"timestamp":{"type":"integer"},"dataPoints":{"type":"integer"},"sma":{"type":"array","items":{"type":"object","properties":{"time":{"type":"integer"},"value":{"type":"number"}}}}}}}}}}}},"/agentFriendly/ta/{slug}/ema":{"get":{"summary":"Get Exponential Moving Average for trend analysis","description":"Returns EMA indicator data optimized for AI trading signals. More responsive than SMA, sampled to 200 points for efficient trend detection.","tags":["AgentFriendly"],"parameters":[{"in":"path","name":"slug","required":true,"schema":{"type":"string"},"description":"Asset slug (e.g., bitcoin)"},{"in":"query","name":"period","schema":{"type":"integer","default":5},"description":"EMA period"},{"in":"query","name":"fetchInterval","schema":{"type":"string","enum":["m1","m5","m15","m30","h1","h2","h6","h12","d1"],"default":"d1"},"description":"Timeframe for price bars"}],"security":[{"bearerAuth":[]}],"responses":{"200":{"description":"EMA data culled to 200 points"}}}},"/agentFriendly/ta/{slug}/rsi":{"get":{"summary":"Get Relative Strength Index for momentum analysis","description":"Returns RSI oscillator data (0-100 scale) for identifying overbought/oversold conditions. Optimized for AI with 200 data points showing momentum trends.","tags":["AgentFriendly"],"parameters":[{"in":"path","name":"slug","required":true,"schema":{"type":"string"},"description":"Asset slug (e.g., bitcoin)"},{"in":"query","name":"period","schema":{"type":"integer","default":14},"description":"RSI period"},{"in":"query","name":"fetchInterval","schema":{"type":"string","enum":["m1","m5","m15","m30","h1","h2","h6","h12","d1"],"default":"d1"},"description":"Timeframe for price bars"}],"security":[{"bearerAuth":[]}],"responses":{"200":{"description":"RSI data culled to 200 points"}}}},"/agentFriendly/ta/{slug}/macd":{"get":{"summary":"Get MACD for trend and momentum analysis","description":"Returns MACD line, signal line, and histogram data for identifying trend changes and momentum shifts. Sampled to 200 points for AI trading analysis.","tags":["AgentFriendly"],"parameters":[{"in":"path","name":"slug","required":true,"schema":{"type":"string"},"description":"Asset slug (e.g., bitcoin)"},{"in":"query","name":"short","schema":{"type":"integer","default":12},"description":"Short EMA period"},{"in":"query","name":"long","schema":{"type":"integer","default":26},"description":"Long EMA period"},{"in":"query","name":"signal","schema":{"type":"integer","default":9},"description":"Signal line EMA period"},{"in":"query","name":"fetchInterval","schema":{"type":"string","enum":["m1","m5","m15","m30","h1","h2","h6","h12","d1"],"default":"d1"},"description":"Timeframe for price bars"}],"security":[{"bearerAuth":[]}],"responses":{"200":{"description":"MACD data culled to 200 points"}}}},"/agentFriendly/asset_mcap_history/{slug}":{"get":{"summary":"Get asset market cap history (direct from mcap_history table) optimized for AI analysis","description":"Returns ~200 intelligently sampled market cap data points with high/low tracking within the requested time range, sourced directly from pre-computed market cap values","tags":["AgentFriendly"],"parameters":[{"in":"path","name":"slug","required":true,"schema":{"type":"string"},"description":"Asset slug (e.g., bitcoin, ethereum)"},{"in":"query","name":"start","required":false,"schema":{"type":"integer"},"description":"Start timestamp in milliseconds (defaults to all time)"},{"in":"query","name":"end","required":false,"schema":{"type":"integer"},"description":"End timestamp in milliseconds (defaults to now)"}],"security":[{"bearerAuth":[]}],"responses":{"200":{"description":"Asset market cap history with approximately 200 data points"},"400":{"description":"Bad request - invalid parameters"},"404":{"description":"Asset not found or no history data available"},"500":{"description":"Internal server error"}}}},"/agentFriendly/total_market_cap_history":{"get":{"summary":"Get total market cap history optimized for AI analysis","description":"Returns ~200 intelligently sampled total market cap data points with high/low tracking within the requested time range","tags":["AgentFriendly"],"parameters":[{"in":"query","name":"start","required":false,"schema":{"type":"integer"},"description":"Start timestamp in milliseconds (defaults to all time)"},{"in":"query","name":"end","required":false,"schema":{"type":"integer"},"description":"End timestamp in milliseconds (defaults to now)"}],"security":[{"bearerAuth":[]}],"responses":{"200":{"description":"Total market cap history with approximately 200 data points"},"400":{"description":"Bad request - invalid parameters"},"500":{"description":"Internal server error"}}}},"/prepaid/create":{"post":{"summary":"Create a free prepaid API key","description":"Creates a new prepaid API key with 50 free starter credits. No payment or signup required.\nWhen credits run out, the API will return 402 with instructions to refill via /prepaid/refill.\n","tags":["Prepaid"],"security":[],"responses":{"200":{"description":"API key created successfully","content":{"application/json":{"schema":{"type":"object","properties":{"apiKey":{"type":"string","description":"Your new 64-char hex API key"},"credits":{"type":"integer","description":"Total credits available (50 free)"},"usage":{"type":"integer","description":"Credits used (0 for new key)"},"remaining":{"type":"integer","description":"Credits remaining"},"callsPerMinute":{"type":"integer","description":"Rate limit (600)"}}}}}}}}},"/prepaid/refill":{"post":{"summary":"Refill a prepaid API key (x402 payment)","description":"Adds credits to an existing prepaid API key via x402 USDC payment on Base.\n\n**Flow:**\n1. POST with just `apiKey` in body (no PAYMENT header) → returns 402 with payment instructions\n2. Sign an EIP-3009 `transferWithAuthorization` using EIP-712 typed data with domain `{name: \"USD Coin\", version: \"2\", chainId: 8453, verifyingContract: \"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913\"}`\n3. Base64-encode the JSON payload `{from, to, value, validAfter, validBefore, nonce, v, r, s}` and retry with `PAYMENT` header\n\n500 credits per $1 USDC. Minimum payment: $0.01 USDC.\n","tags":["Prepaid"],"security":[],"parameters":[{"in":"header","name":"PAYMENT","schema":{"type":"string"},"required":false,"description":"Base64-encoded JSON with EIP-3009 transferWithAuthorization signature.\nShape: { from: address, to: address, value: string (USDC smallest units, 6 decimals), validAfter: number, validBefore: number, nonce: bytes32, v: number, r: bytes32, s: bytes32 }\n"}],"requestBody":{"required":true,"content":{"application/json":{"schema":{"type":"object","required":["apiKey"],"properties":{"apiKey":{"type":"string","description":"The prepaid API key to refill"}}}}}},"responses":{"200":{"description":"Credits added successfully","content":{"application/json":{"schema":{"type":"object","properties":{"apiKey":{"type":"string"},"creditsAdded":{"type":"integer"},"totalCredits":{"type":"integer"},"usage":{"type":"integer"},"remaining":{"type":"integer"},"txHash":{"type":"string"}}}}}},"402":{"description":"Payment required. Response includes full x402 payment instructions.\n","content":{"application/json":{"schema":{"type":"object","properties":{"x402":{"type":"object","properties":{"version":{"type":"integer","example":1},"payTo":{"type":"string","description":"USDC recipient address — use as the `to` field when signing transferWithAuthorization (the server wallet only submits the tx and pays gas)"},"token":{"type":"string","description":"USDC contract address on Base"},"network":{"type":"string","example":"base"},"chainId":{"type":"integer","example":8453},"amountRequired":{"type":"string","description":"Amount in smallest USDC units (6 decimals)"},"amountRequiredFormatted":{"type":"string","example":"$1 USDC"},"scheme":{"type":"string","example":"eip-3009"},"eip712Domain":{"type":"object","description":"EIP-712 domain for signing transferWithAuthorization","properties":{"name":{"type":"string","example":"USD Coin"},"version":{"type":"string","example":"2"},"chainId":{"type":"integer","example":8453},"verifyingContract":{"type":"string","example":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"}}},"payloadFormat":{"type":"string","description":"Expected flat JSON shape for the PAYMENT header (base64-encoded)","example":"{ from, to, value, validAfter, validBefore, nonce, v, r, s }"},"instructions":{"type":"object","properties":{"summary":{"type":"string"},"steps":{"type":"array","items":{"type":"string"}}}}}}}}}}},"404":{"description":"Prepaid key not found"}}}},"/prepaid/info":{"get":{"summary":"Check prepaid key balance","description":"Returns credit balance, usage, and remaining credits for a prepaid API key. No payment or authentication required.","tags":["Prepaid"],"security":[],"parameters":[{"in":"query","name":"apiKey","required":true,"schema":{"type":"string"},"description":"The prepaid API key to check"}],"responses":{"200":{"description":"Key info returned","content":{"application/json":{"schema":{"type":"object","properties":{"credits":{"type":"integer"},"usage":{"type":"integer"},"remaining":{"type":"integer"},"callCount":{"type":"integer"},"callsPerMinute":{"type":"integer"},"enabled":{"type":"boolean"},"createdAt":{"type":"string"},"refillEndpoint":{"type":"string"},"creditsPerDollar":{"type":"integer"}}}}}},"404":{"description":"Prepaid key not found"}}}}},"tags":[{"name":"Price","description":"Minimal endpoints to fetch a USD price by address+network or by symbol."},{"name":"Assets","description":"The asset price is a volume-weighted average calculated by collecting ticker data from exchanges. Each exchange contributes to this price in relation to their volume. All values are translated into USD and can be converted through the /rates endpoint."},{"name":"Exchanges","description":"The /exchanges endpoint offers an understanding into where cryptocurrency is being exchanged and provides high-level information on those exchanges. CoinCap strives to provide transparency in the recency of our exchange data. For that purpose, you will find an \"updated\" key for each exchange. For more details into coin pairs and volume, see the /markets endpoint."},{"name":"Markets","description":"Take a closer look into exchanges with the /markets endpoint. Similar to the /exchanges endpoint, we strive to offer transparency into how real-time our data is with a key identifying when the market was last updated. For a historical view on how a market has performed, see the /candles endpoint."},{"name":"Rates","description":"All prices on the CoinCap API are standardized in USD (United States Dollar). To make translating to other values easy, CoinCap offers a Rates endpoint with fiat and top cryptocurrency translated rates. Fiat rates are available through OpenExchangeRates.org."},{"name":"Technical Analysis","description":"TA related endpoints for retrieving technical indicators and derived candlestick data."},{"name":"Account","description":"Returns wallet address, tier information, staked balances, available API keys, reward rates, and more. Staked balances are in terms of Morpheos Tokens (MOR) on either base or arbitrum chains."},{"name":"AgentFriendly (Beta)","description":"Experimental agent optimized endpoints for use by our chatbot and others.\n- Limits data points per response for optimal processing\n- Simplified JSON structures with clear field names\n\n** These endpoints are under development and may change without notice. Use at your own risk. **\n"},{"name":"Prepaid","description":"Accountless prepaid API keys via x402 USDC payments on Base. No signup required — pay with USDC to create or refill a key."}]}