{"id":"df3d359c-88cd-4fda-b716-389cc8df87c7","shortId":"M7nTaq","kind":"x402","title":"Crypto Fear & Greed index via x402 micropayment on Base (USDC) or Tron (USDT)","tagline":"Crypto Fear & Greed index via x402 micropayment on Base (USDC) or Tron (USDT)","description":"The Fear & Greed endpoint at bridge.eruditepay.com returns crypto market sentiment data (a fear-and-greed index) for a given token. It is an x402-protocol paid endpoint operated by Erudite Intelligence LLC. Callers POST a JSON body containing a token address or symbol and receive a JSON response with sentiment data.\n\nThe endpoint accepts payment via two rails: USDC on Base (eip155:8453) at 10,000 base units ($0.01 per call) or USDT on Tron at 10,000 base units ($0.01 per call). Payment is facilitated through the EruditePay x402 Bridge, which supports the x402 v2 protocol. The facilitator for the Base rail is Coinbase CDP.\n\nDocumentation is sparse — the provider's /docs path returns a 404, and the Bazaar schema embedded in the 402 challenge provides only a minimal example (an empty data object). The input schema indicates a POST with a JSON body containing a \"token\" field (a token address or symbol such as the zero address). The output is typed as JSON with a success boolean and a data object, but the structure of the data object is not documented. The provider is a FinCEN-registered MSB (BSA ID 31000324258137) and operates non-custodially.","tags":[],"capabilities":["crypto-fear-greed-index","market-sentiment","token-analysis","x402-payment","usdc-base","usdt-tron","json-api"],"categories":["crypto","market-data"],"synonyms":["fear and greed index","crypto sentiment","market fear greed","crypto market mood","bitcoin fear greed","token sentiment score"],"warnings":["Output schema is effectively empty — the example data object contains no fields, so the actual response structure is unknown.","Provider documentation at /docs returns 404; no OpenAPI spec is available.","The Bazaar schema example output is just {\"success\": true, \"data\": {}} which provides no insight into actual response fields."],"endpointUrl":"https://bridge.eruditepay.com/v1/market/fear-greed","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x6961b88476a9b89C4ed97A4aF4D190754d5e70A1","amount":"1000","scheme":"exact","network":"eip155:8453","maxTimeoutSeconds":300}]},"qualityScore":"0.450","qualityRationale":"The endpoint is live (402 challenge captured) with clear pricing and a minimal input schema, but the output data structure is entirely undocumented (example shows an empty object), /docs returns 404, and there are no usage examples or detailed field 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'0.01':97,109 '000':94,106 '10':93,105 '31000324258137':222 '402':153 '404':145 '8453':91 'accept':82 'address':69,180,187 'base':9,22,89,95,107,130 'bazaar':148 'bitcoin fear greed' 'bodi':65,173 'boolean':197 'bridg':119 'bridge.eruditepay.com':32 'bsa':220 'call':99,111 'caller':61 'cdp':134 'challeng':154 'coinbas':133 'contain':66,174 'crypto':1,14,34 'crypto market mood' 'crypto sentiment' 'crypto-fear-greed-index' 'custodi':227 'data':37,79,162,200,207 'document':135,211 'eip155':90 'embed':150 'empti':161 'endpoint':30,55,81 'erudit':58 'eruditepay':117 'exampl':159 'facilit':114,127 'fear':2,15,28,40 'fear and greed index' 'fear-and-gre':39 'field':177 'fincen':217 'fincen-regist':216 'given':46 'greed':3,16,29,42 'id':221 'index':4,17,43 'indic':167 'input':165 'intellig':59 'json':64,75,172,193 'json-api' 'llc':60 'market':35 'market fear greed' 'market-sentiment' 'micropay':7,20 'minim':158 'msb':219 'non':226 'non-custodi':225 'object':163,201,208 'oper':56,224 'output':189 'paid':54 'path':142 'payment':83,112 'per':98,110 'post':62,169 'protocol':53,125 'provid':139,155,213 'rail':86,131 'receiv':73 'regist':218 'respons':76 'return':33,143 'schema':149,166 'sentiment':36,78 'spars':137 'structur':204 'success':196 'support':121 'symbol':71,182 'token':47,68,176,179 'token sentiment score' 'token-analysis' 'tron':12,25,103 'two':85 'type':191 'unit':96,108 'usdc':10,23,87 'usdc-base' 'usdt':13,26,101 'usdt-tron' 'v2':124 'via':5,18,84 'x402':6,19,52,118,123 'x402-payment' 'x402-protocol':51 'zero':186","prices":[{"id":"03442747-9485-4e1d-8a28-73093bfa0ca3","listingId":"df3d359c-88cd-4fda-b716-389cc8df87c7","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":null,"chain":"base","payTo":"0x6961b88476a9b89C4ed97A4aF4D190754d5e70A1","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x6961b88476a9b89C4ed97A4aF4D190754d5e70A1","amount":"1000","scheme":"exact","network":"eip155:8453","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:36.248Z"}],"sources":[{"listingId":"df3d359c-88cd-4fda-b716-389cc8df87c7","source":"x402_bazaar","sourceId":"https://bridge.eruditepay.com/v1/market/fear-greed","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:36.248Z","lastSeenAt":"2026-04-22T05:32:28.310Z"}],"details":{"listingId":"df3d359c-88cd-4fda-b716-389cc8df87c7","quickStartSnippet":"curl -X POST https://bridge.eruditepay.com/v1/market/fear-greed \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_header>\" \\\n  -d '{\"token\": \"0x0000000000000000000000000000000000000000\"}'","exampleRequest":{"token":"0x0000000000000000000000000000000000000000"},"exampleResponse":{"data":{},"success":true},"schema":null,"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns x402 v2 challenge with USDC on Base (10000 base units) and USDT on Tron (10000 base units)","source_url":"https://bridge.eruditepay.com/v1/market/fear-greed"},{"claim":"Provider is Erudite Intelligence LLC, FinCEN MSB registered with BSA ID 31000324258137","source_url":"https://bridge.eruditepay.com"},{"claim":"USDC on Base uses 6 decimals, so 10000 base units = $0.01","source_url":"https://bridge.eruditepay.com"},{"claim":"Facilitator for Base rail is Coinbase CDP","source_url":"https://bridge.eruditepay.com/v1/market/fear-greed"},{"claim":"Input body accepts a 'token' field described as 'Token address or symbol'","source_url":"https://bridge.eruditepay.com/v1/market/fear-greed"}],"useCases":["Querying real-time crypto fear-and-greed sentiment for a specific token","Integrating market sentiment signals into automated trading bots","Displaying fear/greed indicators in crypto portfolio dashboards","Feeding sentiment data into AI agents that make on-chain decisions"],"bestFor":["AI agents or bots that need on-demand crypto sentiment data via micropayment","Developers building x402-native applications with per-call pricing","Low-cost market sentiment lookups at $0.01 per request"],"notFor":["Users who need free or bulk-discounted sentiment data","Applications requiring detailed historical fear-and-greed time series (output schema is undocumented)","Non-crypto market sentiment analysis"],"kindDetails":{},"updatedAt":"2026-04-22T01:47:13.033Z"}}