A development guide for building Solana financial applications with Jupiter and Helius. Jupiter provides trading and other finance services, while Helius provides blockchain data, transaction delivery, and streaming tools.

Creating token swaps, lending, limit orders, recurring purchases, token-data features, wallet analysis, and real-time blockchain updates.

It brings the required setup and implementation guidance together for common on-chain finance features and requires checking that the Helius tool service is available.

jupiter — Skill for Cursor by helius-labs/core-ai

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add helius-labs/core-ai --skill jupiter

Clone the repo

git clone --depth 1 https://github.com/helius-labs/core-ai

Made for: Cursor.

Or install helius, the plugin that ships this one along with the rest of its 4 skills, 1 agent, 1 MCP server.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/helius-labs/core-ai/jupiter/github.svg)](https://agentmods.dev/skills/helius-labs/core-ai/jupiter)

Your own site

<a href="https://agentmods.dev/skills/helius-labs/core-ai/jupiter"><img src="https://agentmods.dev/badge/skills/helius-labs/core-ai/jupiter/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/helius-labs/core-ai/jupiter"><img src="https://agentmods.dev/badge/skills/helius-labs/core-ai/jupiter.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 66 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 4,667 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.

Origin 95% copy Near-identical to another mod in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00066	$0.04667
Opus 5.5	$0.00026	$0.01867
Sonnet 5.5	$0.00013	$0.00933
Haiku 4.5	$0.00007	$0.00467

Measured 3d ago against content hash 3f722fe5a04e, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

jupiter scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

If they are NOT available, **STOP**. Do NOT attempt to call Helius APIs via curl or any other workaround. Tell the user:

Origin

This is a copy

95% identical to helius-jupiter — 49 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

helius-cursor/skills/jupiter/SKILL.md · 328 lines

How it starts

The opening of the file, as written. The whole thing — 328 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Helius x Jupiter — Build DeFi Apps on Solana

Helius MCP now uses 10 public tools total, including expandResult. When this skill references a Helius action name like getPriorityFeeEstimate, getAssetsByOwner, or parseTransactions, call the matching public tool with action: "<action name>".

You are an expert Solana developer building DeFi applications with Jupiter's APIs and Helius's infrastructure. Jupiter is the leading Solana DEX aggregator and DeFi suite — providing token swaps, lending/borrowing, limit orders, DCA, token data, and more. Helius provides superior transaction submission (Sender), priority fee optimization, asset queries (DAS), real-time on-chain streaming (WebSockets, LaserStream), and wallet intelligence (Wallet API).

Prerequisites

Before doing anything, verify these:

1. Helius MCP Server

The Helius MCP server should start automatically with this plugin. Check that Helius MCP public tools are available (e.g., heliusWallet, heliusAsset, heliusChain).

If they are NOT available, STOP. Do NOT attempt to call Helius APIs via curl or any other workaround. Tell the user:

The Helius MCP server isn't running. Try restarting Cursor.
If the problem persists, add it manually via Settings > Cursor Settings > MCP
with command: npx [email protected]

2. Jupiter API Key

Jupiter REST endpoints require an API key via the x-api-key header. Get one at developers.jup.ag/portal. If the user doesn't have one, read references/jupiter-portal.md for setup instructions.

3. Helius API Key

If any Helius MCP tool returns an "API key not configured" error, read references/helius-onboarding.md for setup paths (existing key, agentic signup, or CLI).

Routing

Identify what the user is building, then read the relevant reference files before implementing. Always read references BEFORE writing code.

Quick Disambiguation

These intents map to different Jupiter APIs. Route them correctly:

Read the full file on GitHub · 328 lines

Files

What ships with it

16 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

3d ago Changed 3f722fe5a04e
5d ago Changed a7d0edf6fe71
9d ago Changed e4f0ed555a53
1mo ago Changed ac7bad97469b
1mo ago First seen · 328 lines · 66 tokens per session scan A 81a851a25ffa

Subscribe to this mod's changes

jupiter is a skill published in the GitHub repository helius-labs/core-ai (29 stars, last pushed yesterday), licensed MIT. It adds 66 tokens to every session and 4,667 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). It is 95% identical to helius-jupiter, differing in 49 lines, and is treated as a copy.

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