Best Crypto Sentiment APIs in 2026: Social, On-Chain and Fear & Greed Compared

Eleven crypto sentiment tools, sorted by what they do. Per-coin social scores, on-chain-fused feeds, enterprise Twitter firehoses and the free market-wide Fear & Greed index solve different problems, so the right pick depends on whether you need coin-level polarity, a crypto market sentiment gauge or an institutional contract.

By Alexander Schneider, Founder & Managing Director · July 1, 2026

The short version

  • Widest social surface, AI-agent ready: LunarCrush
  • Social plus on-chain for quants: Santiment
  • Self-serve, multi-asset, free tier: Adanos
  • Free market-mood baseline: Alternative.me Fear & Greed
  • Cheap 93-emotion dataset: Augmento
  • Institutional Twitter firehose: The Tie
Tools compared11
Free options7
UpdatedJul 1, 2026
Adanos ranks#3 of 11

Pick by what you need. Per-coin social APIs (LunarCrush, Santiment) give you a coin-level score; self-serve options with real free tiers (Adanos, StockGeist, Augmento) are the cheapest way to start; enterprise Twitter feeds (The Tie, Kaito, Messari) win on rigor but are sales-quoted. Underneath all of them, the free Fear & Greed index reads the market's overall mood in one number, though it cannot rank one coin against another.

This comparison is published on Adanos's own website, so treat its placement with appropriate skepticism. We rank it #3 and put two broader rivals above it, but the Adanos figures are self-reported from our product pages and not independently audited.

At a glance

How they compare

Scan the field, then read the full write-ups below. The last two rows are the free market-wide Fear & Greed index rather than a per-coin API, kept in for context. Pricing and limits were checked in July 2026. Vendors change them often, so confirm before you commit.

Eleven crypto sentiment tools compared across sources, sentiment output, price, update latency, coin coverage and commercial rights
ToolSourcesSentiment outputFree tier / fromUpdate latencyCoin coverageCommercial on lower tier
LunarCrush6 networks: X, Reddit, TikTok, YouTube, IG, newsGalaxy Score, AltRank, Sentiment %Free = market data only; $72-90/moNear real-time (REST)4,000+ coins + 2,000+ stocksUndocumented per tier
Santiment7 social + on-chain + dev activityWeighted sentiment, social volume/dominanceFree 1k calls; $49 / $249~5 min; real-time on Max2,800+ coinsNo; resale needs corporate
AdanosReddit (20+ crypto subreddits)Bull/bear % + 0-100 BuzzScoreFree 250/mo; $29 / $299Hourly (every 60 min)5,000+ symbolsYes, on $299
Token MetricsX, Reddit, Telegram, news-1 to +1 per channel + summaryFree 500 calls; paid tiers*HourlyThousands of tokensPaid plans
StockGeistReddit, X, Discord, TelegramPos/neu/neg + emotion10k credits free; $75 packReal-time (REST + SSE)400+ coinsNot clearly stated
AugmentoX, Reddit, BitcoinTalk0-1 indicator + 93 emotionsFree (delayed); $20 / $150Hourly; delayed on free25+ coinsNo; only on $999
The TieX firehose (filtered)0-100 (50 = neutral) + momentumNone; enterpriseEvery minute250+ tokensContract only
MessariX0-100 score + momentumResearch-only freeDailyBroad (unconfirmed)Contract
KaitoWeb3 social, X-centricMindshare + sentimentNone; enterpriseReal-time~2,000 tokensContract
Alternative.me F&GComposite: volatility, momentum, social, dominance0-100 market gaugeFree, no keyDailyMarket-wide, BTC-centricYes, with attribution
CoinMarketCap F&GProprietary composite0-100 market gaugeFree tier; $29 Builder~15 minMarket-wideFrom $29 Builder
Methodology

How we ranked them

We sorted on the things that change a buying decision rather than a single overall score. A tool can rank lower here and still be the right call for your use case.

Sources are listed at the foot of this page. Figures reflect July 2026 and vendors change them often.

Per-coin, not just macro

We separate a coin-level social score that can rank BTC against ETH from the single market-wide Fear & Greed gauge. Both are useful, but they answer different questions, so we keep the index in for context and rank the per-coin APIs on their own terms.

Verified pricing

Free-tier limits and entry prices were read off each vendor’s own pricing and docs pages. Several render client-side or sit behind a sales quote, so where we could not confirm a figure we mark it unconfirmed rather than guess.

Fit, not a leaderboard

Social-source breadth, on-chain fusion, latency, history and commercial rights matter differently to a quant desk than to a bot builder, so we name the best pick per use case instead of crowning one winner.

The contenders

The tools, ranked

Each tool below lists its category, entry price, what it scores and the buyer it suits. Pricing was checked in July 2026 against vendor pages; confirm before you build on it.

#1

LunarCrush

Multi-network crypto social intelligence API
Free data only · $90/mo

The category-defining crypto social API. Its Galaxy Score and AltRank fuse social engagement, sentiment and price across six networks. It is also the most AI-agent-ready option here thanks to a first-class MCP server. The catch in 2026 is that the free tier is now market-data only, so social sentiment starts on a paid plan.

Sources
X (Twitter), Reddit, YouTube, TikTok, Instagram and News. No Telegram, Discord or on-chain data.
Access
REST API v4 (single Bearer token), first-class MCP server, CLI, official Claude connector, LangChain and CrewAI integrations, web dashboard. No WebSocket or GraphQL.
Best for
Developers and AI/agent builders who want the widest multi-platform crypto and stock social signal wired natively into LLM workflows.

Strengths

  • Widest social surface in the category, six networks plus stocks, distilled into the well-known Galaxy Score and AltRank
  • Best-in-class AI-agent ergonomics: first-class MCP server, Claude connector and one Bearer-token REST call, no GraphQL or WebSocket to wire
  • Near-real-time refresh, with a product page citing 100M+ posts a day processed live
  • Transparent self-serve pricing with an instant dashboard key, flexible billing and a token-payment discount

Watch-outs

  • No free sentiment tier any more; social data starts at roughly $72 to $90 a month and the free Hobby tier is market-data only
  • REST-only with no streaming, so you poll within small lower-tier limits (the Individual tier is 2,000 calls a day)
  • Published figures conflict: the API product page still advertises stale free and unlimited limits that the live pricing page contradicts
  • Per-tier commercial and redistribution rights are undocumented, so confirm before reselling
#2

Santiment (SanAPI)

Quant-native social, on-chain and dev-activity API
Free 1k/mo · $49 / $249

The quant's pick. One GraphQL endpoint bundles per-platform social sentiment across seven networks with on-chain analytics and GitHub developer activity, backed by transparent published formulas and a pandas SDK. Mind the pricing ladder, though: the $49 Pro plan does not unlock real-time or remove a 30-day data lag, which needs the $249 Max tier.

Sources
Seven social platforms with per-source metrics (X, Reddit, Telegram, 4chan, BitcoinTalk, YouTube, Farcaster), plus on-chain across 14 blockchains and GitHub dev activity.
Access
GraphQL API only, official 'sanpy' Python SDK returning pandas DataFrames, Sanbase web dashboard. No REST and no streaming.
Best for
Quant and algo crypto traders and on-chain researchers who want granular per-platform sentiment fused with on-chain and dev signals for backtesting.

Strengths

  • Widest granular social-source breadth, seven platforms including 4chan, BitcoinTalk and Farcaster, each with its own metrics
  • Cross-signal in one API: social plus on-chain across 14 chains plus GitHub dev activity plus price
  • Quant-native with the sanpy pandas SDK, 1,000+ metrics and deep restricted-metric history on the top tier
  • Transparent public docs with exact metric formulas and ranges, plus crypto-native billing

Watch-outs

  • The $49 Pro plan does not unlock real-time or remove the 30-day data lag; you need the $249 Max tier
  • Free tier is heavily gated at 1,000 calls a month with a lagged one-year history window
  • GraphQL-only, with a query-complexity cap and a per-metric access system to learn
  • No redistribution or resale without a corporate subscription
#3

Adanos Reddit Crypto Sentiment API

Self-serve Reddit crypto sentiment on a one-key multi-asset platform
Free · $29 / $299

The self-serve pick with a real free tier. Adanos returns a transparent 0-100 BuzzScore plus bullish and bearish percentages for crypto from Reddit. The same API key also covers stock sentiment from Reddit, X, news and Polymarket. It is honestly narrower than the leaders: Reddit is its only social source for crypto, updates run hourly and history tops out at a year. You can preview the scoring with no key on the free Reddit Top 100 Crypto page.

Sources
Reddit only for crypto, across 20+ communities such as r/CryptoCurrency, r/Bitcoin and r/ethtrader. The wider one-key platform adds X, news and Polymarket for stocks.
Access
REST/JSON with an X-API-Key header, endpoints for trending, per-token, compare (up to 10 symbols), search and market-wide sentiment, plus a companion CLI. No WebSocket.
Best for
A developer or quant who wants a transparent, cheap, self-serve Reddit crypto BuzzScore with a genuine free tier, plus stock sentiment under the same key.

Strengths

  • Genuine free tier (250 requests a month) with fully documented response fields, easy to evaluate before paying
  • Transparent, published BuzzScore methodology (0-100) with a dedicated whitepaper, not a black-box number
  • One API key spans five sentiment sources across crypto and stocks, uniquely convenient for a multi-asset desk
  • Cheap, clear pricing ($29 and $299) with clean REST JSON, a compare endpoint and a market-wide reading

Watch-outs

  • Reddit is the only social source for crypto, so multi-platform rivals like LunarCrush and Santiment beat it on breadth
  • Hourly updates with no streaming, too slow for latency-sensitive bots
  • History reaches 365 days at most, shallower than Santiment or a dedicated backtest feed
  • Commercial use is paywalled to the $299 Professional tier, a step up from the free and $29 tiers
#4

Token Metrics API

AI crypto analytics with a multi-source sentiment endpoint
Free 500 calls · paid tiers

An AI crypto-analytics platform whose self-serve data API bundles a dedicated multi-source Sentiment endpoint alongside its trading grades and signals. Sentiment arrives as an hourly -1 to +1 score per channel with a short natural-language summary of what moved it. Exact dollar pricing is the weak spot: the pricing page is gated, so tiers above the free plan could not be confirmed.

Sources
X, Reddit, Telegram and news, modeled into an hourly per-channel sentiment score.
Access
REST/JSON, official Python and TypeScript SDKs, a QuickNode marketplace add-on and a Postman collection. Card, USDC or token payment.
Best for
Developers and AI-agent builders who want multi-source sentiment bundled with ML trading grades and signals in one self-serve, crypto-native API.

Strengths

  • Genuinely multi-source (X, Reddit, Telegram and news) with an intuitive -1 to +1 polarity plus a text summary
  • Real free tier plus official Python and TypeScript SDKs and marketplace distribution
  • Sentiment sits alongside ML trading grades and signals, one API for both signal and sentiment
  • Crypto-native payment with meaningful staking discounts

Watch-outs

  • Exact dollar pricing is opaque; the pricing page is gated, so paid-tier figures could not be confirmed
  • Sentiment is one feature of a broader signals product, not a sentiment specialist
  • The free tier is small (500 calls a month) and history is capped unless you buy up
  • Sentiment is hourly and per-channel, with the exact coin universe undocumented
#5

StockGeist.ai

Real-time crypto and stock sentiment API with streaming
Free 10k credits · $75 pack

A self-serve real-time sentiment API covering crypto and stocks over both REST and an SSE stream, with a generous free tier and pay-as-you-go credits. It splits scores into positive, neutral and negative plus an informative-versus-emotional dimension. History depth and the exact numeric scale are thin in the public docs.

Sources
Social-media text, with X, Reddit, Discord and Telegram referenced. The full source list is not enumerated publicly.
Access
REST/JSON, SSE streaming, an official Python SDK and a web dashboard. No RapidAPI dependency.
Best for
Indie devs and quant traders wanting a cheap, self-serve, pay-per-credit crypto sentiment feed with a real free tier and streaming.

Strengths

  • Real free tier (10,000 REST credits a month) plus a permanent free crypto stream
  • Transparent per-credit pricing with no subscription lock-in
  • Both REST and SSE streaming, rare at this price point
  • Crypto and stocks in one API with an official Python SDK

Watch-outs

  • Exact sentiment metric ranges are undocumented without docs access
  • History depth is unstated, which weakens any backtesting claim
  • Streaming plans escalate quickly, into the low thousands for crypto streams
  • A smaller brand than LunarCrush or Santiment, with a source list that is not fully disclosed
#6

Augmento

Crypto social sentiment with a 93-category emotion taxonomy
Free delayed · $20 / $150

A self-serve crypto sentiment API that classifies posts into 93 sentiment, topic and emotion categories, Fear, FUD, FOMO, hacks and more, across three platforms. It is now run by Postera Capital in Germany with public pricing. Pricing turns on recency: every tier gets the same data and you pay for how recent it is, so the free tier is delayed by 7 to 30 days and commercial use is paywalled to the $999 Institutional plan.

Sources
Three social platforms, X (Twitter), Reddit and BitcoinTalk, each weighted equally and filterable. No on-chain or news.
Access
REST/JSON (Api-Key header), CSV export and a web dashboard. No WebSocket.
Best for
Individual crypto quants and analysts who want a cheap or free, granular multi-platform emotion dataset for backtesting and market timing.

Strengths

  • Genuinely low-cost self-serve: a real free tier plus a $20 entry, no sales call
  • 93 emotion and topic categories across three platforms, filterable by source, far richer than positive-versus-negative
  • A simple 0-1 indicator plus a daily bullish/neutral/bearish signal at hourly granularity, with CSV and API on every tier
  • Years of history for backtesting, backed by an operating firm with terms freshly updated in 2026

Watch-outs

  • Commercial use is paywalled to $999 a month; the free, $20 and $150 tiers are personal-use only
  • The free tier is heavily delayed (7 to 30 days), fine for backtests but useless for live trading
  • Coverage is modest at 25-plus coins, social-only, with no WebSocket
  • The public GitHub quickstart is stale, so verify endpoints against the in-dashboard docs
#7

The Tie

Institutional crypto sentiment and data platform
Enterprise / quote

The institutional reference for crypto Twitter sentiment. The engine ingests the full X firehose, filters out more than 99% as noise and scores the rest on a 0-100 scale against a 100,000-term dictionary, recalculated every minute. There is no self-serve or free tier: pricing is a sales conversation. The buyer is a fund or desk, not a hobbyist.

Sources
The X/Twitter firehose only for the sentiment score, over a billion tweets a week, aggressively filtered. The wider platform adds news, on-chain, derivatives and equities as separate datasets.
Access
A REST Quant API (x-api-key), the SigDev terminal, historical flat files for backtesting and an MCP server for AI-agent access.
Best for
Institutional desks, funds, market makers and OTC desks that want rigorously filtered Twitter sentiment fused with news, derivatives and on-chain in one stack.

Strengths

  • Full Twitter/X firehose with aggressive relevance and anti-manipulation filtering and a 100,000-term NLP dictionary
  • A rich, well-documented metric set (momentum, dominance, NVTweet, hype-to-activity) on a clean 0-100 scale, recalculated every minute
  • Sentiment sits inside a broad institutional stack: news, on-chain, derivatives, unlocks and fundraising
  • A real, profitable company with maintained docs and an MCP server for agents

Watch-outs

  • No public pricing and no free or self-serve tier; you have to talk to sales
  • The sentiment signal itself is X-only, with no Reddit, BitcoinTalk or on-chain in the score
  • Enterprise contract minimums are likely high and were not confirmable
  • Overkill for a hobbyist or small quant who just needs a coin-level number
#8

Messari Signal / Sentiment

Institutional crypto research platform with a new X-sentiment API
Paid / enterprise

Messari is best known for research and market data across 40,000-plus assets. In 2026 it added a productized X-derived Sentiment API under its Signal endpoints. It returns a 0-100 score against a 20-day baseline plus a momentum reading and a positive/neutral/negative split. The product is paid and mostly enterprise, so the endpoint's reachability below the top tier could not be confirmed.

Sources
X/Twitter only for the sentiment metric, weighted toward high-mindshare accounts. No Reddit or news in the score.
Access
REST/JSON, a dashboard and Messari AI. No official SDK.
Best for
Institutions and funds already buying Messari research that want an X-sentiment signal inside a broad market-data, fundraising and governance stack.

Strengths

  • A real supervised-ML sentiment score, now productized on a clean 0-100 scale
  • Momentum plus a positive, neutral and negative breakdown, not just one number
  • Bundled with deep asset, market, fundraising and governance data
  • A reputable institutional brand

Watch-outs

  • X-only, with no Reddit or news in the score
  • Gated behind paid and enterprise plans with no public price; the pricing page is not reachable
  • Coverage count and history depth are undocumented
  • Not viable for indie or self-serve developers, with the free-tier reachability of the endpoint unconfirmed
#9

Kaito AI

Crypto attention (mindshare) and sentiment platform
Enterprise / quote

A prominent 2026 entrant built around 'mindshare', a share-of-attention score, with sentiment analytics layered on top and exposed through an enterprise API. The attention metric is genuinely differentiated and widely cited across crypto this year. The trade-offs: sentiment is secondary to attention, there is no self-serve or free tier and the metric definitions are not published.

Sources
Broad Web3 social sources, X-centric attention data.
Access
A REST API and contact-sales onboarding. No self-serve signup.
Best for
Funds, exchanges and project teams that want the market-leading attention and mindshare signal plus sentiment, with an enterprise budget.

Strengths

  • A category-defining 'mindshare' metric, widely cited across crypto in 2026
  • Real-time plus historical data, with roughly 2,000-token coverage
  • Strong brand momentum and ecosystem adoption
  • Sentiment fused with a genuinely differentiated attention dataset

Watch-outs

  • No self-serve or free tier; enterprise only
  • Opaque pricing with no public figures
  • Sentiment is secondary to the attention and mindshare product
  • The sentiment metric definitions and ranges are unpublished
#10

Alternative.me Crypto Fear & Greed Index

The free market-wide Fear & Greed index, not per-coin
Free, no key

Not a per-coin API but the free baseline every crypto sentiment tool is measured against. It is a single market-wide 0-100 gauge (0 is Extreme Fear, 100 is Extreme Greed), Bitcoin-centric, built from a published mix of volatility, momentum, social and dominance. Free, keyless, with history back to 2018 and commercial use allowed with attribution. Layer it under a real per-coin API, since it cannot rank BTC against ETH.

Sources
A composite with published weights: volatility 25%, market momentum and volume 25%, social media 15%, surveys 15% (currently paused), dominance 10% and Google Trends 10%.
Access
REST/JSON and CSV, no API key. A web widget and image embed are available.
Best for
Indie devs, dashboards, bots and researchers who want a free market-mood gauge plus a long historical series for backtesting.

Strengths

  • Fully free and keyless
  • The longest history of any Fear & Greed index, back to 2018
  • The only free index that publishes its input weights
  • JSON and CSV output with a simple attribution-only license

Watch-outs

  • A single Bitcoin-centric market index, with no per-coin sentiment
  • Daily only, with no intraday reading
  • The surveys input, 15% of the mix, is currently paused
  • Community-run with no SLA or guaranteed uptime, plus mandatory attribution for commercial display
#11

CoinMarketCap Fear & Greed Index

The official Fear & Greed endpoint inside a market-data API
Free tier · $29 Builder

The official, commercially-licensable version of the market-wide gauge, inside CoinMarketCap's data API. It returns the same 0-100 value and label, with the endpoint reachable on the free Basic tier rather than paywalled. Like Alternative.me it is a single market number rather than a per-coin score; CMC does not publish its exact weights.

Sources
A proprietary composite of price momentum, volatility, derivatives, volume, dominance and social signals, with weights not published.
Access
REST/JSON (API key required), a dashboard, an official MCP server and pay-per-call.
Best for
Product teams already on CMC's market-data API who want an official, brandable single Fear & Greed gauge with commercial licensing and an SLA.

Strengths

  • Dedicated Fear & Greed endpoints, latest and historical, reachable even on the free Basic plan
  • A clean 0-100 value and label, with commercial licensing and an SLA available
  • An official MCP server plus pay-per-call options
  • Sits alongside CMC's broad market-data API

Watch-outs

  • A single market-wide index only, with no per-coin sentiment
  • The methodology and weights are not fully disclosed
  • The free tier is non-commercial, with historical depth gated by plan
  • Its index values differ from Alternative.me's, so the two are not interchangeable
Disclosure

Where Adanos fits and where it does not

Adanos lands at #3, above the self-serve pack (Token Metrics, StockGeist, Augmento) and the enterprise-only feeds you cannot sign up for (The Tie, Messari, Kaito), but honestly below LunarCrush and Santiment. It earns the upper slot because it pairs a transparent, documented BuzzScore with a genuine free tier and a one-key platform that also covers stocks. That order is contestable: StockGeist beats it on real-time streaming and Token Metrics on source breadth, so ranking Adanos above them rests on the transparent score, the verifiable free tier and the reach across crypto and stocks under one key. It is not higher because it is Reddit-only for crypto, updates hourly rather than in real time and reaches 365 days of history. LunarCrush spans six networks while Santiment fuses on-chain and developer activity with deeper backtests.

Honest strengths

  • Transparent, published BuzzScore (0-100) with a whitepaper, plus bullish and bearish percentages, not a black box
  • A real free tier (250 requests a month) and low, predictable $29 and $299 self-serve pricing
  • One key spans crypto and stock sentiment across Reddit, X, news and Polymarket, handy for a multi-asset desk
  • Developer-first REST/JSON with compare, search and market-wide endpoints, plus a CLI

Honest limits

  • Reddit-only for crypto, so LunarCrush (six networks) and Santiment (seven plus on-chain) beat it on breadth
  • Hourly updates with no streaming, unsuited to latency-sensitive strategies
  • History reaches 365 days, shallower than Santiment's multi-year windows for backtesting
  • Commercial use needs the $299 Professional tier, above the free and $29 plans

This comparison is published on Adanos's own website, so treat its placement with appropriate skepticism. We rank it #3 and put two broader rivals above it, but the Adanos figures are self-reported from our product pages and not independently audited.

Questions

FAQ

What is the best crypto sentiment API?

It depends on what you need. LunarCrush leads for the widest social surface wired for AI agents, with its Galaxy Score and AltRank across six networks. Santiment leads for social fused with on-chain and developer activity in one quant-native API. Adanos fits if you want a self-serve API with a real free tier that also covers stocks under one key. The Tie is the reference for an institutional Twitter feed. No single tool wins for every buyer.

Is there a free crypto sentiment API?

Yes, but read the fine print. Adanos has a real free tier of 250 requests a month for Reddit crypto sentiment. StockGeist gives 10,000 free monthly credits, while Augmento's free tier is delayed by 7 to 30 days. The free Alternative.me Fear and Greed Index is fully free and keyless but market-wide, not per coin. LunarCrush's free tier is now market-data only and no longer includes social sentiment.

What is the crypto Fear and Greed Index and is it an API?

It is a single market-wide 0-100 gauge (0 is Extreme Fear, 100 is Extreme Greed), Bitcoin-centric, not a per-coin score. Alternative.me publishes it as a free keyless API with history back to 2018 and commercial use allowed with attribution. CoinMarketCap offers an official version whose endpoint is reachable on its free tier, with commercial rights from its paid Builder plan. It is best layered under a real per-coin sentiment API, since it cannot rank BTC against ETH or SOL.

Galaxy Score vs weighted sentiment, what is the difference?

They are two vendors' proprietary constructions. LunarCrush's Galaxy Score (0-100) fuses social engagement, sentiment and price health into one health score, paired with AltRank. Santiment's weighted sentiment is a rolling Z-score of unique social volume times average sentiment, centered near zero. Both compress many signals into one number, so treat them as relative indicators rather than directly comparable percentages.

Which crypto sentiment API covers the most social platforms?

Santiment covers seven platforms with per-source metrics (X, Reddit, Telegram, 4chan, BitcoinTalk, YouTube and Farcaster). LunarCrush covers six (X, Reddit, YouTube, TikTok, Instagram and News). Augmento covers three (X, Reddit and BitcoinTalk) with a 93-category emotion taxonomy. Adanos is Reddit-only for crypto, so it trades breadth for a transparent score and a one-key multi-asset platform.

References

Sources

Primary sources checked while writing this piece. Vendor pricing and features change; figures reflect July 2026.

  1. LunarCrush API, Galaxy Score, AltRank and social metrics
  2. Santiment SanAPI plans and sentiment metrics
  3. Adanos Reddit Crypto Sentiment API, BuzzScore and pricing
  4. Token Metrics API, sentiment endpoint and plans
  5. StockGeist crypto sentiment API and pricing
  6. Augmento crypto sentiment API, taxonomy and pricing
  7. The Tie sentiment metrics documentation
  8. Messari Signal sentiment API overview
  9. Kaito API, mindshare and sentiment
  10. Alternative.me Crypto Fear and Greed Index and free API
  11. CoinMarketCap API, Fear and Greed endpoint and pricing
For Developers
A transparent crypto sentiment API, free to start

Adanos returns a documented BuzzScore, bullish and bearish percentages and trend history for crypto from Reddit. The same key covers stock sentiment across Reddit, X, news and Polymarket. The free tier needs no card.

Get a free API key