NEXUS Sentiment Analysis

Analyze emotional tone and detect opinions

Security Scan

The skill's requirements and runtime instructions are internally consistent with a paid remote sentiment-analysis API, but you should verify the external service and treat the payment credential as sensitive before installing.

Purpose & Capability

The name/description (sentiment analysis) match the SKILL.md and README which instruct the agent to call a remote NEXUS sentiment-analysis endpoint. Required items (network access and a payment proof token) are proportional to a paid API integration.

Instruction Scope

Instructions are limited to calling the specified remote endpoint and following payment flows (x402 / MPP / legacy header). They do not ask the agent to read filesystem, shell, or unrelated environment variables. All data flows go to the documented emergent.host endpoints.

Install Mechanism

This is an instruction-only skill with no install spec or code to write to disk — lowest-risk install behavior. No external downloads or package installs are performed by the skill itself.

Credentials

The only required env var is NEXUS_PAYMENT_PROOF (declared as primary), which is consistent with the payment-oriented API. This is a sensitive credential; the skill legitimately needs a payment proof but you should not reuse high-privilege keys or store them in insecure places.

Persistence & Privilege

The skill is not always-enabled and does not request persistent system privileges. It does require outbound network access to the service, which is appropriate for an API-only skill.

Assessment

This skill is coherent: it calls a remote NEXUS sentiment-analysis API and requires a payment proof token (NEXUS_PAYMENT_PROOF). Before installing, verify the service (https://ai-service-hub-15.emergent.host), confirm pricing ($0.10/request) and supported currencies, and prefer using the sandbox token (sandbox_test) for testing. Treat NEXUS_PAYMENT_PROOF as a secret — do not expose it in public repos or logs. If you don't recognize the emergent.host domain or cannot find independent documentation, consider testing with the sandbox or contacting the service operator first. Minor notes: the SKILL.md internal version differs from the registry version and there is no homepage listed; these reduce transparency but do not contradict the skill's stated behavior.

Sentiment Analysis API

NEXUS Agent-as-a-Service on Cardano + Stellar | Price: $0.10/request | Accepts: ADA, DJED, iUSD, USDCx, USDM (Cardano) + USDC, XLM (Stellar)

When to use

Use when you need to analyze emotional tone and detect opinions.

Steps

Option A: x402 Standard (Recommended)

1. Call the service endpoint without payment headers.
2. Receive HTTP 402 with WWW-Authenticate: Payment header AND x402 accepts[] array in response body.
3. Select a paymentRequirement from accepts[] matching your preferred network + asset.
4. Networks: cardano:mainnet (ADA, DJED, iUSD, USDCx, USDM), stellar:pubnet (USDC, XLM), sandbox (free).
5. Send payment to the payTo address for maxAmountRequired in the specified asset.
6. Stellar fee sponsorship: POST your signed XDR to https://ai-service-hub-15.emergent.host/api/mpp/stellar/sponsor — NEXUS pays gas, you need 0 XLM.
7. Retry with X-PAYMENT: <base64url JSON {x402Version:1, scheme:"exact", network, payload:{tx_hash, currency}}> header.
8. Parse the JSON response and X-PAYMENT-RESPONSE header.

Option B: MPP Standard

1. Call the service endpoint without payment headers.
2. Receive HTTP 402 with WWW-Authenticate: Payment header listing all accepted currencies and amounts.
3. Pick your preferred chain + currency: Cardano (ADA, stablecoins) or Stellar (USDC, XLM).
4. Create payment: Masumi escrow (Cardano) or direct Stellar transfer.
5. Stellar fee sponsorship: POST your signed XDR to https://ai-service-hub-15.emergent.host/api/mpp/stellar/sponsor — NEXUS pays gas, you need 0 XLM.
6. Retry with Authorization: Payment <base64url-credential> header.
7. Parse the JSON response and Payment-Receipt header.

Option C: Legacy Header

1. Send a POST request to the NEXUS API endpoint with your input.
2. Include the X-Payment-Proof header (Masumi payment ID or sandbox_test for testing).
3. Parse the JSON response and return the result.

API Call

curl -X POST https://ai-service-hub-15.emergent.host/api/original-services/sentiment-analysis \
  -H "Content-Type: application/json" \
  -H "X-Payment-Proof: $NEXUS_PAYMENT_PROOF" \
  -d '{
  "input": "Example input for Sentiment Analysis API"
}'

Endpoint: https://ai-service-hub-15.emergent.host/api/original-services/sentiment-analysis Method: POST Headers:

• Content-Type: application/json
• X-PAYMENT: <base64url JSON> (x402 standard — recommended)
• Authorization: Payment <credential> (MPP standard)
• X-Payment-Proof: <masumi_payment_id> (legacy — use sandbox_test for free testing)

Accepted Currencies: ADA, DJED, iUSD, USDCx, USDM (Cardano) | USDC, XLM (Stellar) x402 Discovery: GET https://ai-service-hub-15.emergent.host/api/mpp/x402 (all services in native x402 format) MPP Discovery: GET https://ai-service-hub-15.emergent.host/api/mpp/discover Stablecoin Registry: GET https://ai-service-hub-15.emergent.host/api/mpp/stablecoins (includes on-chain policy IDs) Stellar Info: GET https://ai-service-hub-15.emergent.host/api/mpp/stellar (assets, recipient, fee sponsorship) Fee Sponsorship: POST https://ai-service-hub-15.emergent.host/api/mpp/stellar/sponsor (NEXUS pays Stellar gas — agents need 0 XLM)

External Endpoints

URL	Method	Data Sent
https://ai-service-hub-15.emergent.host/api/original-services/sentiment-analysis	POST	Input parameters as JSON body

Security & Privacy

• All data is sent to https://ai-service-hub-15.emergent.host over HTTPS/TLS.
• No data is stored permanently; requests are processed and discarded.
• Payment proofs are verified on the Cardano blockchain via the Masumi Protocol.
• No filesystem access or shell execution required.

Model Invocation Note

This skill calls the NEXUS AI service API which uses LLM models (GPT-5.2, Claude Sonnet 4.5, GPT-4o) to process requests. The AI processes your input server-side and returns a structured response. You may opt out by not installing this skill.

Trust Statement

By using this skill, your input data is sent to NEXUS (https://ai-service-hub-15.emergent.host) for AI processing. Payments are non-custodial via the Masumi Protocol on Cardano. Only install if you trust NEXUS as a service provider. Visit https://ai-service-hub-15.emergent.host for full documentation.

Tags

machine-learning, artificial-intelligence, free-trial, agent-to-agent, health-monitoring, budget