NEXUS Text To Sql

Convert natural language to optimized SQL queries

Security Scan

The skill is internally consistent: it is an instruction-only wrapper around a paid external Text→SQL API and only requests a payment-proof credential appropriate to that purpose, but you should vet the external service before giving it real payment credentials.

Purpose & Capability

The name/description match the runtime instructions: this skill forwards input to an external NEXUS Text-to-SQL API and expects a payment proof. Asking for a payment proof (NEXUS_PAYMENT_PROOF) is coherent with a paid API.

Instruction Scope

The SKILL.md instructs the agent to POST requests to https://ai-service-hub-15.emergent.host and to perform payment flows (x402 / MPP / Masumi / legacy X-Payment-Proof). It does not request filesystem or shell access. Note: the instructions explicitly ask you to send payment proofs and potentially signed Stellar XDRs to the sponsor endpoint, which is expected for fee-sponsorship flows but will transmit payment-related data to the external service.

Install Mechanism

Instruction-only skill with no install spec and no code files — nothing is downloaded or written to disk by the skill itself.

Credentials

Only one required env var (NEXUS_PAYMENT_PROOF) is declared, which matches the documented payment/header flows. This is proportional, but that env var is a sensitive payment credential and should be treated as secret. The SKILL.md refers only to that env var and no other credentials.

Persistence & Privilege

The skill is not always:true and is user-invocable. It requests network access (needed to contact the external API) but no filesystem/shell privileges. Autonomous invocation (disable-model-invocation: false) is the platform default and is not by itself a concern.

Assessment

This skill is a thin client that sends your text to an external paid API (ai-service-hub-15.emergent.host). Before installing: 1) Verify you trust the NEXUS service and its domain and read its payment/privacy docs. 2) Treat NEXUS_PAYMENT_PROOF as a secret — don’t store production payment credentials in shared shells or repos. 3) Use the provided sandbox mode (X-Payment-Proof: sandbox_test) to test behavior without paying. 4) Be aware the skill will transmit payment proofs and (if using Stellar sponsorship) signed XDRs to the sponsor endpoint — only proceed if you are comfortable sending that data. 5) If you have security concerns, prefer not to install and instead call the API manually from an environment you control so you can audit requests/responses. If you want a higher-confidence assessment, provide independent documentation for the ai-service-hub-15.emergent.host service or TLS certificate / domain ownership details.

Text-to-SQL Converter

NEXUS Agent-as-a-Service on Cardano + Stellar | Price: $0.20/request | Accepts: ADA, DJED, iUSD, USDCx, USDM (Cardano) + USDC, XLM (Stellar)

When to use

Use when you need to convert natural language to optimized sql queries.

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/text-to-sql \
  -H "Content-Type: application/json" \
  -H "X-Payment-Proof: $NEXUS_PAYMENT_PROOF" \
  -d '{
  "input": "Example input for Text-to-SQL Converter"
}'

Endpoint: https://ai-service-hub-15.emergent.host/api/original-services/text-to-sql 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/text-to-sql	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