{"id":"f0b3abe6-e0a2-4f25-986f-de9c6feff1f4","shortId":"ernCX5","kind":"skill","title":"coingecko-api","tagline":"This skill should be used when the user asks for crypto prices, market data, market cap, trending coins, historical or OHLC data, token lookup by contract address, coin search, token logos, global crypto stats, or mentions CoinGecko API.","description":"# CoinGecko API\n\n## Overview\n\nQuery cryptocurrency market data using the CoinGecko API V3. This skill covers:\n\n- Price lookups by coin ID, symbol, or contract address\n- Market data with rankings, volume, and price changes\n- Historical price charts and OHLC data\n- Search and trending coins\n- Global market statistics\n\n**Scope:** Covers the Demo (free), Analyst, Lite, and Pro tiers. For on-chain DEX data (GeckoTerminal endpoints), consult the fallback documentation.\n\n## Prerequisites\n\n### API Key Detection\n\nBefore making any API call, determine the available API key:\n\n```bash\nif [ -n \"$COINGECKO_PRO_API_KEY\" ]; then\n  CG_BASE=\"https://pro-api.coingecko.com/api/v3\"\n  CG_AUTH=(-H \"x-cg-pro-api-key: $COINGECKO_PRO_API_KEY\")\nelif [ -n \"$COINGECKO_API_KEY\" ]; then\n  CG_BASE=\"https://api.coingecko.com/api/v3\"\n  CG_AUTH=(-H \"x-cg-demo-api-key: $COINGECKO_API_KEY\")\nelse\n  CG_BASE=\"https://api.coingecko.com/api/v3\"\n  CG_AUTH=()\n  echo \"Warning: No CoinGecko API key found. Using keyless access (stricter rate limits).\"\n  echo \"For higher limits, set COINGECKO_API_KEY or COINGECKO_PRO_API_KEY.\"\nfi\n```\n\n### API Tiers\n\n| Tier                 | Base URL                               | Auth Header         | Rate Limit                |\n| -------------------- | -------------------------------------- | ------------------- | ------------------------- |\n| Demo                 | `https://api.coingecko.com/api/v3`     | `x-cg-demo-api-key` | ~30 calls/min, ~10k/month |\n| Analyst / Lite / Pro | `https://pro-api.coingecko.com/api/v3` | `x-cg-pro-api-key`  | Plan-dependent            |\n\nAuthentication via HTTP header (recommended). Query parameters (`x_cg_demo_api_key` / `x_cg_pro_api_key`) also work.\n\n## Coin ID Resolution\n\nCoinGecko uses string IDs (e.g., `bitcoin`, `ethereum`, `uniswap`) rather than symbols. Before querying, resolve the correct coin ID.\n\n### Resolution Strategy\n\n1. **Common coins** — Use well-known IDs directly: `bitcoin`, `ethereum`, `solana`, `cardano`, `chainlink`, `uniswap`, `aave`, `maker`. Note that some IDs diverge from the coin name: `binancecoin` (BNB), `avalanche-2` (AVAX), `polygon-ecosystem-token` (POL) — see the table below.\n2. **Symbol lookup** — Use `/simple/price` with the `symbols` parameter for quick lookups: `symbols=btc,eth`. Symbols are not unique — multiple coins can share the same symbol. By default, only the top-market-cap coin per symbol is returned; pass `include_tokens=all` to get all matches.\n3. **Ambiguous symbols** — If a symbol maps to multiple coins (e.g., \"UNI\" could be Uniswap or Universe), use `/search?query=<name>` to disambiguate. Always verify the result matches the user's intent.\n4. **Contract address** — Use `/simple/token_price/{platform_id}` when a contract address is provided.\n5. **Unknown coins** — Use `/search?query=<term>` to find the correct ID before querying.\n\n### Common Coin IDs\n\n| Coin        | ID                        | Symbol |\n| ----------- | ------------------------- | ------ |\n| Bitcoin     | `bitcoin`                 | BTC    |\n| Ethereum    | `ethereum`                | ETH    |\n| Solana      | `solana`                  | SOL    |\n| BNB         | `binancecoin`             | BNB    |\n| XRP         | `ripple`                  | XRP    |\n| Cardano     | `cardano`                 | ADA    |\n| Dogecoin    | `dogecoin`                | DOGE   |\n| Chainlink   | `chainlink`               | LINK   |\n| Avalanche   | `avalanche-2`             | AVAX   |\n| Polygon     | `polygon-ecosystem-token` | POL    |\n| Uniswap     | `uniswap`                 | UNI    |\n| Aave        | `aave`                    | AAVE   |\n| Maker       | `maker`                   | MKR    |\n| USDC        | `usd-coin`                | USDC   |\n| USDT        | `tether`                  | USDT   |\n| DAI         | `dai`                     | DAI    |\n| Wrapped BTC | `wrapped-bitcoin`         | WBTC   |\n\n## Platform Resolution\n\nDo not default to Ethereum. Always infer the platform from the user's prompt before making contract-based API calls.\n\n### Inference Rules\n\n1. **Explicit platform mention** — If the user mentions a chain name (e.g., \"on Polygon\", \"Arbitrum token\", \"Base chain\"), map it to the corresponding platform ID (see `./references/platforms.md`).\n2. **Platform-specific tokens** — Some tokens exist primarily on specific platforms:\n   - SOL, BONK, JUP → Solana (`solana`)\n   - POL → Polygon (`polygon-pos`)\n   - ARB → Arbitrum One (`arbitrum-one`)\n   - OP → Optimism (`optimistic-ethereum`)\n3. **Address format hints** — Base58 addresses (no `0x` prefix) may be Solana or Tron — ask the user to clarify. `0x`-prefixed addresses are EVM but exist on multiple chains.\n4. **Testnet keywords** — Words like \"testnet\", \"Sepolia\", \"Goerli\", \"devnet\" indicate testnets. CoinGecko does not index testnet tokens — inform the user immediately.\n5. **Ambiguous cases** — If the platform cannot be inferred, **ask the user** before proceeding. Do not assume Ethereum.\n\n### Unsupported Platforms\n\nIf the user references a chain not indexed by CoinGecko, respond with:\n\n```\nThe chain \"[chain name]\" is not supported by the CoinGecko API.\n\nFor the current list of supported platforms, query:\nhttps://api.coingecko.com/api/v3/asset_platforms\n```\n\nFor a curated list of common platforms, see `./references/platforms.md`. For the full live index, query the endpoint above.\n\n## Core Workflows\n\n### Quick Price Check\n\nFetch current price for one or more coins:\n\n```bash\ncurl -s \"$CG_BASE/simple/price?ids=bitcoin,ethereum&vs_currencies=usd&include_24hr_change=true&include_market_cap=true\" \"${CG_AUTH[@]}\"\n```\n\nFor symbol-based lookups:\n\n```bash\ncurl -s \"$CG_BASE/simple/price?symbols=btc,eth&vs_currencies=usd\" \"${CG_AUTH[@]}\"\n```\n\n### Token Price by Contract Address\n\nFetch price using a contract address on a specific chain:\n\n```bash\ncurl -s \"$CG_BASE/simple/token_price/ethereum?contract_addresses=0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48&vs_currencies=usd&include_market_cap=true\" \"${CG_AUTH[@]}\"\n```\n\nCommon platform IDs: `ethereum`, `polygon-pos`, `arbitrum-one`, `optimistic-ethereum`, `base`, `avalanche`, `binance-smart-chain`. For the full list, see `./references/platforms.md`.\n\n### Token Logo\n\nThe `/coins/{id}` response includes logo URLs in the `image` object:\n\n| Field         | Typical Size |\n| ------------- | ------------ |\n| `image.thumb` | 25x25 px     |\n| `image.small` | 50x50 px     |\n| `image.large` | 200x200 px   |\n\nFetch via `/coins/{id}` or `/coins/{platform}/contract/{address}` — the `image` field is present in both responses.\n\n### Market Rankings\n\nFetch top coins by market cap with detailed data:\n\n```bash\ncurl -s \"$CG_BASE/coins/markets?vs_currency=usd&order=market_cap_desc&per_page=10&page=1&price_change_percentage=24h,7d\" \"${CG_AUTH[@]}\"\n```\n\n### Historical Price Data\n\nFetch price history for charts:\n\n```bash\n# Last 7 days (hourly granularity)\ncurl -s \"$CG_BASE/coins/bitcoin/market_chart?vs_currency=usd&days=7\" \"${CG_AUTH[@]}\"\n\n# Last 365 days (daily granularity)\ncurl -s \"$CG_BASE/coins/bitcoin/market_chart?vs_currency=usd&days=365\" \"${CG_AUTH[@]}\"\n```\n\nAuto-granularity: 1 day → 5-min intervals, 2-90 days → hourly, >90 days → daily.\n\nResponse contains `prices`, `market_caps`, and `total_volumes` arrays of `[timestamp_ms, value]` pairs.\n\n### OHLC / Candlestick Data\n\nFetch OHLC data for charting:\n\n```bash\ncurl -s \"$CG_BASE/coins/bitcoin/ohlc?vs_currency=usd&days=7\" \"${CG_AUTH[@]}\"\n```\n\nReturns `[[timestamp, open, high, low, close], ...]`. Valid `days` values: `1`, `7`, `14`, `30`, `90`, `180`, `365`, `max`.\n\n### Global Market Stats\n\n```bash\ncurl -s \"$CG_BASE/global\" \"${CG_AUTH[@]}\"\n```\n\nReturns total market cap, 24h volume, BTC/ETH dominance percentages, and active cryptocurrencies count.\n\n### Search for a Coin\n\n```bash\ncurl -s \"$CG_BASE/search?query=sablier\" \"${CG_AUTH[@]}\"\n```\n\nReturns matching coins, exchanges, categories, and NFTs sorted by market cap.\n\n### Trending Coins\n\n```bash\ncurl -s \"$CG_BASE/search/trending\" \"${CG_AUTH[@]}\"\n```\n\nReturns top trending coins based on CoinGecko search activity.\n\n## Output Formatting\n\n**Default behavior:** Present results in a Markdown table:\n\n```markdown\n| Coin | Price (USD) | 24h Change | Market Cap |\n| ---- | ----------- | ---------- | ---------- |\n| Bitcoin | $67,187.34 | +3.64% | $1.32T |\n| Ethereum | $3,456.78 | +2.15% | $415.2B |\n```\n\n**User preference:** If the user requests a specific format (JSON, CSV, plain text), use that format instead.\n\n### Number Formatting\n\n- Prices > $1: 2 decimal places (e.g., `$67,187.34`)\n- Prices $0.01–$1: 4 decimal places (e.g., `$0.4523`)\n- Prices < $0.01: 6+ decimal places (e.g., `$0.000001234`)\n- Market caps: abbreviated (e.g., `$1.32T`, `$415.2B`, `$8.5M`)\n- Percentages: 2 decimal places with sign (e.g., `+3.64%`, `-1.23%`)\n\n## Rate Limits\n\nFor Pro/Analyst/Lite plans, query the `/key` endpoint for live quotas (Pro base URL only — returns 401 on Demo):\n\n```bash\ncurl -s \"https://pro-api.coingecko.com/api/v3/key\" -H \"x-cg-pro-api-key: $COINGECKO_PRO_API_KEY\"\n```\n\nReturns `plan`, `rate_limit_request_per_minute`, `monthly_call_credit`, and `current_remaining_monthly_calls`. Demo users should refer to the [pricing page](https://www.coingecko.com/en/api/pricing) for current limits.\n\n**Approximate defaults** (may vary):\n\n| Tier        | Requests/Min | Monthly Cap |\n| ----------- | ------------ | ----------- |\n| Demo (free) | ~30          | ~10,000     |\n| Analyst     | ~500         | ~500,000    |\n| Lite        | ~500         | ~1,000,000  |\n| Pro         | ~1,000       | ~3,000,000  |\n\nIf rate limited (HTTP 429), wait briefly and retry. Batch multiple coin queries into single calls using comma-separated IDs where possible.\n\n## Error Handling\n\n| HTTP Code | Error Code | Cause                                 | Action                                                                                                                                                                    |\n| --------- | ---------- | ------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| 401       | 10002      | Invalid or missing API key            | Verify the key value and base URL match the tier                                                                                                                          |\n| 401       | 10005      | Endpoint not included in current plan | Use the tier-restricted fallback below                                                                                                                                    |\n| 429       | —          | Rate limit exceeded                   | Wait and retry; reduce request frequency                                                                                                                                  |\n| 200 `{}`  | —          | Unknown coin ID or contract address   | `/simple/*` endpoints return empty `{}` instead of 404 for unrecognized IDs/addresses. Treat an empty response as \"not found\" and use `/search` to resolve the correct ID |\n| 404       | —          | Invalid endpoint path                 | Verify the endpoint URL is correct                                                                                                                                        |\n\n### Tier-Restricted Endpoints\n\nSome endpoints return 401 (error code 10005) on the Pro base URL for lower-tier plans (e.g., Analyst) but work on the Demo base URL.\n\n**Known Analyst-tier restrictions** (401/10005 on Pro base URL):\n\n- `/search/trending`\n- `/global`\n- `/global/decentralized_finance_defi`\n\n**Fallback strategy:** On a 401 with error code 10005, retry on the Demo base URL. If `COINGECKO_API_KEY` is available, use it for better rate limits; otherwise fall back to keyless:\n\n```bash\nif [ -n \"$COINGECKO_API_KEY\" ]; then\n  curl -s \"https://api.coingecko.com/api/v3/search/trending\" \\\n    -H \"x-cg-demo-api-key: $COINGECKO_API_KEY\"\nelse\n  curl -s \"https://api.coingecko.com/api/v3/search/trending\"\nfi\n```\n\nDo not use this fallback for error code 10002 (invalid key) — that indicates a misconfigured API key, not a tier restriction.\n\n## Reference Files\n\n- **`./references/endpoints.md`** — Curated endpoint reference with parameters, response formats, and asset platform IDs\n- **`./references/platforms.md`** — Curated list of common asset platform IDs with chain mappings (query `/asset_platforms` for the full live index)\n\n## Fallback Documentation\n\nFor endpoints not covered by this skill (on-chain DEX data, NFT details, exchange-specific queries), fetch the AI-friendly documentation:\n\n```\nhttps://docs.coingecko.com/llms.txt\n```\n\nUse `WebFetch` to retrieve this documentation for extended API capabilities.","tags":["coingecko","api","agent","skills","paulrberg","agent-skills","ai-agents"],"capabilities":["skill","source-paulrberg","skill-coingecko-api","topic-agent-skills","topic-ai-agents"],"categories":["agent-skills"],"synonyms":[],"warnings":[],"endpointUrl":"https://skills.sh/PaulRBerg/agent-skills/coingecko-api","protocol":"skill","transport":"skills-sh","auth":{"type":"none","details":{"cli":"npx skills add PaulRBerg/agent-skills","source_repo":"https://github.com/PaulRBerg/agent-skills","install_from":"skills.sh"}},"qualityScore":"0.476","qualityRationale":"deterministic score 0.48 from registry signals: · indexed on github topic:agent-skills · 52 github stars · SKILL.md body (12,783 chars)","verified":false,"liveness":"unknown","lastLivenessCheck":null,"agentReviews":{"count":0,"score_avg":null,"cost_usd_avg":null,"success_rate":null,"latency_p50_ms":null,"narrative_summary":null,"summary_updated_at":null},"enrichmentModel":"deterministic:skill-github:v1","enrichmentVersion":1,"enrichedAt":"2026-05-12T06:57:10.078Z","embedding":null,"createdAt":"2026-05-09T12:56:17.091Z","updatedAt":"2026-05-12T06:57:10.078Z","lastSeenAt":"2026-05-12T06:57:10.078Z","tsv":"'+2.15':1088 '+3.64':1082,1150 '-1.23':1151 '-2':315,462 '-90':939 '/api/v3':135,159,177,219,234 '/api/v3/asset_platforms':684 '/api/v3/key':1177 '/api/v3/search/trending':1447,1463 '/asset_platforms':1512 '/coins':815,839,842 '/contract':844 '/en/api/pricing)':1214 '/global':1402 '/global/decentralized_finance_defi':1403 '/key':1159 '/llms.txt':1546 '/references/endpoints.md':1488 '/references/platforms.md':547,693,811,1500 '/search':391,421,1345 '/search/trending':1401 '/simple':1326 '/simple/price':330 '/simple/token_price':408 '0.000001234':1132 '0.01':1119,1127 '0.4523':1125 '000':1230,1234,1238,1239,1242,1244,1245 '0x':588,600 '0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48':777 '1':286,521,881,933,988,1111,1120,1237,1241 '1.32':1083,1137 '10':879,1229 '10002':1278,1473 '10005':1295,1371,1412 '10k/month':228 '14':990 '180':993 '187.34':1081,1117 '2':326,548,938,1112,1144 '200':1319 '200x200':835 '24h':885,1010,1075 '24hr':728 '25x25':829 '3':373,581,1086,1243 '30':226,991,1228 '365':915,927,994 '4':404,610,1121 '401':1169,1277,1294,1368,1408 '401/10005':1396 '404':1332,1351 '415.2':1089,1139 '429':1250,1309 '456.78':1087 '5':417,631,935 '500':1232,1233,1236 '50x50':832 '6':1128 '67':1080,1116 '7':899,911,976,989 '7d':886 '8.5':1141 '90':942,992 'aav':301,473,474,475 'abbrevi':1135 'access':189 'action':1276 'activ':1016,1060 'ada':453 'address':30,65,406,414,582,586,602,759,765,776,845,1325 'ai':1541 'ai-friend':1540 'also':261 'alway':395,503 'ambigu':374,632 'analyst':92,229,1231,1383,1393 'analyst-ti':1392 'api':3,41,43,52,110,116,121,128,143,147,152,167,170,184,199,204,207,224,239,254,259,517,673,1183,1187,1282,1421,1440,1453,1456,1480,1555 'api.coingecko.com':158,176,218,683,1446,1462 'api.coingecko.com/api/v3':157,175,217 'api.coingecko.com/api/v3/asset_platforms':682 'api.coingecko.com/api/v3/search/trending':1445,1461 'approxim':1218 'arb':570 'arbitrum':535,571,574,795 'arbitrum-on':573,794 'array':953 'ask':12,595,640 'asset':1497,1505 'assum':647 'auth':137,161,179,212,736,754,786,888,913,929,978,1005,1031,1051 'authent':244 'auto':931 'auto-granular':930 'avail':120,1424 'avalanch':314,460,461,801 'avax':316,463 'b':1090,1140 'back':1433 'base':132,156,174,210,516,537,740,800,1056,1165,1289,1375,1389,1399,1417 'base/coins/bitcoin/market_chart':906,922 'base/coins/bitcoin/ohlc':971 'base/coins/markets':869 'base/global':1003 'base/search':1027 'base/search/trending':1049 'base/simple/price':720,746 'base/simple/token_price/ethereum':774 'base58':585 'bash':123,716,742,770,865,897,967,999,1023,1045,1172,1436 'batch':1255 'behavior':1064 'better':1428 'binanc':803 'binance-smart-chain':802 'binancecoin':312,446 'bitcoin':271,295,436,437,494,722,1079 'bnb':313,445,447 'bonk':561 'briefli':1252 'btc':339,438,491,748 'btc/eth':1012 'call':117,518,1197,1203,1261 'calls/min':227 'candlestick':960 'cannot':637 'cap':19,359,733,783,861,875,949,1009,1042,1078,1134,1225 'capabl':1556 'cardano':298,451,452 'case':633 'categori':1036 'caus':1275 'cg':131,136,141,155,160,165,173,178,222,237,252,257,719,735,745,753,773,785,868,887,905,912,921,928,970,977,1002,1004,1026,1030,1048,1050,1181,1451 'chain':100,530,538,609,656,664,665,769,805,1509,1529 'chainlink':299,457,458 'chang':73,729,883,1076 'chart':76,896,966 'check':707 'clarifi':599 'close':984 'code':1272,1274,1370,1411,1472 'coin':21,31,60,83,263,282,288,310,346,360,382,419,431,433,482,715,858,1022,1034,1044,1055,1072,1257,1321 'coingecko':2,40,42,51,126,145,151,169,183,198,202,266,621,660,672,1058,1185,1420,1439,1455 'coingecko-api':1 'comma':1264 'comma-separ':1263 'common':287,430,690,787,1504 'consult':105 'contain':946 'contract':29,64,405,413,515,758,764,775,1324 'contract-bas':514 'core':703 'correct':281,426,1349,1360 'correspond':543 'could':385 'count':1018 'cover':56,88,1523 'credit':1198 'crypto':14,36 'cryptocurr':46,1017 'csv':1101 'curat':687,1489,1501 'curl':717,743,771,866,903,919,968,1000,1024,1046,1173,1443,1459 'currenc':725,751,779,871,908,924,973 'current':676,709,1200,1216,1300 'dai':487,488,489 'daili':917,944 'data':17,25,48,67,79,102,864,891,961,964,1531 'day':900,910,916,926,934,940,943,975,986 'decim':1113,1122,1129,1145 'default':353,500,1063,1219 'demo':90,166,216,223,253,1171,1204,1226,1388,1416,1452 'depend':243 'desc':876 'detail':863,1533 'detect':112 'determin':118 'devnet':618 'dex':101,1530 'direct':294 'disambigu':394 'diverg':307 'docs.coingecko.com':1545 'docs.coingecko.com/llms.txt':1544 'document':108,1519,1543,1552 'doge':456 'dogecoin':454,455 'domin':1013 'e.g':270,383,532,1115,1124,1131,1136,1149,1382 'echo':180,193 'ecosystem':319,467 'elif':149 'els':172,1458 'empti':1329,1338 'endpoint':104,701,1160,1296,1327,1353,1357,1364,1366,1490,1521 'error':1269,1273,1369,1410,1471 'eth':340,441,749 'ethereum':272,296,439,440,502,580,648,723,790,799,1085 'evm':604 'exceed':1312 'exchang':1035,1535 'exchange-specif':1534 'exist':555,606 'explicit':522 'extend':1554 'fall':1432 'fallback':107,1307,1404,1469,1518 'fetch':708,760,837,856,892,962,1538 'fi':206,1464 'field':825,848 'file':1487 'find':424 'format':583,1062,1099,1106,1109,1495 'found':186,1342 'free':91,1227 'frequenc':1318 'friend':1542 'full':696,808,1515 'geckotermin':103 'get':370 'global':35,84,996 'goer':617 'granular':902,918,932 'h':138,162,1178,1448 'handl':1270 'header':213,247 'high':982 'higher':195 'hint':584 'histor':22,74,889 'histori':894 'hour':901,941 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