Obol

io.github.halfkeyPublished by GitHub account halfkeyv2.0.1Updated Oct 25, 2026

Solana agent gateway via x402. Wallet, token, DeFi, and swap tools. Pay per request.

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Overview

AI-generated overview

A local MCP server that gives an assistant pay-per-request Solana data tools: wallet analytics, token prices, DeFi positions and swap quotes, paid in USDC via x

What you can do
Query Solana wallets: overview, portfolio, activity, risk assessment and P&L analysis, each billed per request in USDC over x402 payment protocol
When to use it
Useful when an assistant needs Solana wallet analytics, token prices, DeFi position data or swap quotes and the user is willing to pay small per-request USDC fees instead of managing API keys or subscriptions.
Requirements
Runs locally via npx from the npm package obol-mcp (Node.js). Needs the OBOL_URL environment variable pointing at an Obol API instance. Paid endpoints require a Solana wallet with USDC and the x402 payment flow; no accounts or API keys are used.
Before you install
Every paid tool call spends real USDC from the user's Solana wallet, with prices from $0.005 to $0.25 per request. The swap execute tool builds a transaction for signing. The README's example loads a wallet private key from an environment variable, so keep such keys out of logs and configs.

Installation

In SourceWeft

  1. Open Obol in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Desktop only via STDIO. STDIO servers start a local process, so they need the SourceWeft desktop host.

Other MCP clients

Follow the launch instructions in the repository.

README

obol

Pay the ferryman. Solana agent gateway via x402.

Obol is a pay-per-use Solana API for AI agents. No API keys, no subscriptions — agents pay per request in USDC using the x402 payment protocol. Solana's sub-cent transaction costs make micropayments viable for the first time.

Named after the coin placed on the tongue of the dead to pay Charon for passage across the River Styx. The original micropayment.

How it works

  1. Agent requests data from a paid endpoint
  2. Obol returns HTTP 402 with a payment requirement (amount, recipient, network)
  3. Agent sends USDC on Solana matching the requirement
  4. Agent retries with transaction proof in the X-PAYMENT header
  5. Obol verifies on-chain and returns the data

No accounts. No tokens. No onboarding. Just pay and go.

Endpoints

Wallet Analytics

EndpointPriceDescription
GET /api/v1/wallet/:addr/overview$0.01SOL balance, token count, total value
GET /api/v1/wallet/:addr/portfolio$0.05Full holdings with prices, NFTs, breakdown
GET /api/v1/wallet/:addr/activity$0.05Transaction history with categorization
GET /api/v1/wallet/:addr/risk$0.10Multi-factor risk assessment
GET /api/v1/wallet/:addr/pnl$0.15Token flow analysis, current values, P&L

Token Data

EndpointPriceDescription
GET /api/v1/token/:mint/price$0.005Real-time price via Jupiter
GET /api/v1/token/:mint/metadata$0.01Name, symbol, supply, decimals

DeFi

EndpointPriceDescription
GET /api/v1/defi/swap/quote$0.005Jupiter swap quote with route planning
POST /api/v1/defi/swap/execute$0.25Jupiter swap transaction builder
GET /api/v1/defi/positions/:addr$0.10DeFi positions — LSTs, LPs, lending
GET /api/v1/defi/lst/yields$0.02LST yield comparison across Solana

Free

EndpointDescription
GET /API info and pricing
GET /healthService status
POST /api/v1/rpcProxied Helius RPC (allowlisted methods)

Agent Example

See examples/agent-client.ts for a full reference implementation. The key flow:

typescript
import { ObolAgent } from './examples/agent-client';
const agent = new ObolAgent();await agent.discover();  // fetch pricingagent.loadWallet(process.env.AGENT_PRIVATE_KEY);
// Auto-discovers price, pays, and returns dataconst price = await agent.fetch('/api/v1/token/USDC_MINT/price');

Run in discovery-only mode (no wallet needed):

bash
npx tsx examples/agent-client.ts

MCP Server

Obol ships as an MCP server — any AI agent that supports the Model Context Protocol can discover and call Obol's tools natively.

Install from npm

bash
npm install -g obol-mcp

Claude Desktop / Claude Code

Add to your MCP config:

json
{  "mcpServers": {    "obol": {      "command": "npx",      "args": ["-y", "obol-mcp"],      "env": {        "OBOL_URL": "https://obol-production.up.railway.app"      }    }  }}

Or if developing locally:

json
{  "mcpServers": {    "obol": {      "command": "npx",      "args": ["tsx", "/path/to/obol/src/mcp.ts"],      "env": {        "OBOL_URL": "http://localhost:3000"      }    }  }}

Available MCP Tools

ToolDescription
obol_wallet_overviewSOL balance, token count, total value
obol_wallet_portfolioFull holdings with prices and breakdown
obol_wallet_activityTransaction history with categorization
obol_wallet_riskMulti-factor risk assessment
obol_wallet_pnlToken flow analysis and P&L
obol_token_priceReal-time price via Jupiter
obol_token_metadataName, symbol, supply, decimals
obol_swap_quoteJupiter swap quote with routing
obol_swap_executeBuild swap transaction for signing
obol_defi_positionsLSTs, LPs, lending positions
obol_lst_yieldsLST yield comparison
obol_healthAPI health check (free)
obol_infoEndpoint pricing and info (free)

Run locally

bash
npm run mcp

Stack

  • Fastify 5 — high-performance HTTP
  • @x402/svm — official x402 SDK for Solana
  • Helius — RPC + DAS API
  • Jupiter — token prices + swap execution
  • Upstash Redis — cache + payment receipts
  • TypeScript — full type safety
  • Zod — runtime validation

Setup

bash
git clone https://github.com/halfkey/obol.gitcd obolnpm installcp .env.example .env# Edit .env with your Helius key and merchant wallet addressnpm run dev

Testing

bash
# Unit + integration tests (46 tests)npm test -- --run
# Smoke test against live deploymentnpx tsx scripts/smoke-test.ts https://obol-production.up.railway.app
# Manual payment testnpx tsx scripts/test-payment.ts <tx-signature>

Environment

See .env.example. Key variables:

  • PAYMENT_MODE — mock (dev, auto-approve) or onchain (production)
  • PAYMENT_RECIPIENT_ADDRESS — your Solana wallet that receives USDC
  • HELIUS_API_KEY — Helius RPC access
  • UPSTASH_REDIS_REST_URL / TOKEN — cache layer

Roadmap

  • 11 paid endpoints (wallet, token, DeFi, LST, P&L)
  • On-chain USDC verification with replay prevention
  • Test suite (46 vitest + 20-point smoke test)
  • Agent client reference implementation
  • GitHub Actions CI
  • WebSocket subscriptions for wallet monitoring
  • Dynamic congestion-based pricing
  • Multi-chain support

License

MIT

Source: README.md at commit 86297f1

Tools

0
SourceWeft has not started this package in its sandbox yet, so its tools are not known.

Version history

1
  1. v2.0.1LatestSep 16, 2026

Score

50% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 days25 pts

    Keep the endpoint answering the MCP handshake; SourceWeft probes it every 30 days.

  • Auth declared10 pts

    Declare the credential headers in the registry entry, or keep the endpoint answering the probe so its auth can be classified.

  • Tools listed15 pts

    Answer tools/list without a credential, or ship a package that starts in a sandbox without one.

  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts
  • License10 pts