{"uid":"cap_inqQ9OGgnT6Frf9Mu0qMv","slug":"synapse-sentiment-analysis-7a379dee","name":"Synapse Sentiment Analysis","description":"Public data and utility APIs paid per call in USDC on Base (x402). No accounts, no API keys. 174 routes: crypto/equity data, onchain reads, DNS/email/security intel, geo/weather, x402 payment diagnostics, dev utilities and more.","url":"https://anibalb.duckdns.org/x402/sentiment?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"properties":{"type":"string"}}},"responseSchema":{"type":"json","example":{"label":"positive","score":0.62,"neutral":0.22,"negative":0.08,"positive":0.7}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.002/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_cWduxr5h7cv9iO_5oNzq-","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Analyzes text and returns a sentiment classification (positive, neutral, negative) with confidence scores for each label.","exampleAgentPrompt":"Can you analyze the sentiment of this review: 'The product arrived quickly and works perfectly, but the packaging was a bit flimsy' — I want to know if it's positive, neutral, or negative and how confident you are?","exampleUseCases":[{"title":"Customer review sentiment triage","prompt":"Classify this customer review as positive, negative, or neutral and give me a confidence score: 'Shipping took forever and the item was damaged when it arrived — really disappointed.'"},{"title":"Social media brand monitoring","prompt":"I need to know the sentiment of this tweet about our brand: 'Just tried @BrandX's new app and honestly it's way smoother than I expected — impressed!' Is it positive, negative, or neutral?"},{"title":"Support ticket emotional tone detection","prompt":"Can you check the emotional tone of this support message and tell me the sentiment scores: 'I've been waiting three weeks for a refund and no one is responding to my emails — this is unacceptable.'"}],"resultDescription":"Returns a JSON object with a top-level sentiment label ('positive', 'neutral', or 'negative'), an overall score, and individual probability scores for positive, neutral, and negative sentiment (e.g. {label: 'positive', score: 0.62, neutral: 0.22, negative: 0.08, positive: 0.70}).","failureModes":["Missing or empty text input returns an error or undefined label","Very short or ambiguous input may produce low-confidence scores across all three classes","Non-English text may produce inaccurate sentiment classifications","Payment failure (insufficient USDC balance) returns HTTP 402 before analysis runs","Rate limiting or server unavailability returns 5xx errors"],"whenToPreferThis":"Choose this endpoint when you need a fast, pay-per-call sentiment classification with no account setup, API keys, or subscriptions — ideal for one-off analyses or low-volume pipelines. At $0.002 per call it is cost-effective for ad-hoc agent workflows. Prefer alternatives if you need batch processing of large corpora, multilingual support guarantees, or fine-grained emotion detection beyond positive/neutral/negative.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-31T18:40:47.111Z","isFirstParty":false,"canonicalSlug":"synapse-sentiment-analysis-7a379dee"}