Solana Priority Fee Estimator API

io.github.Br0ski777Published by GitHub account Br0ski777v1.1.0Updated Oct 24, 2026

Solana priority fees at 6 levels, cost in SOL/USD, congestion. x402.

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Overview

AI-generated overview

Remote MCP endpoint that returns Solana priority fee estimates at six levels, paid per call in USDC via x402.

What you can do
  • Fetch priority fee estimates for Solana transactions, returned as six levels from min to max in microlamports per compute unit.
  • Request global fees or program-specific fees by passing a program ID.
  • Receive the current slot and update timestamp alongside the fee levels.
  • Pay per call through the x402 protocol instead of using an API key.
When to use it
Useful when an assistant helps prepare or reason about Solana transactions and needs a current priority fee recommendation, for example before swaps, mints or token transfers. Only worth adding if the client can settle x402 micropayments.
Requirements
A remote MCP client pointed at the hosted endpoint; nothing to install locally. No API key or signup, but each call is paid in USDC on Base L2 through x402, so an x402-capable client and a funded wallet are needed. Network access to the provider's endpoint.
Before you install
Every call costs money ($0.003 per fee request) and is settled in USDC on Base L2, so a wallet with funds must be available to the client. The provider also mentions an OAuth-wrapped x402 route. Fee estimates are advisory and may not reflect conditions at transaction time.

Installation

In SourceWeft

  1. Open Solana Priority Fee Estimator API in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Web executable via SSE. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/io.github.Br0ski777%2Fsolana-fees/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config.

{
  "mcpServers": {
    "solana-priority-fee-estimator-api": {
      "type": "sse",
      "url": "https://solana-fees.api.klymax402.com/mcp"
    }
  }
}

README

Solana Priority Fee Estimator API

[MCP Server] [x402] [License: MIT]

Solana priority fee estimates at 6 levels (min to max). Essential for every Solana transaction. Pay-per-call via x402 (USDC on Base L2) -- no API key, no signup, no rate-limit wall.

Part of the klymax402 marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.

Quickstart -- MCP

Add to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):

json
{  "mcpServers": {    "solana-fees": {      "url": "https://solana-fees.api.klymax402.com/mcp"    }  }}

Quickstart -- HTTP (x402)

bash
curl "https://solana-fees.api.klymax402.com/api/fees"# -> 402 Payment Required, with an x402 payment challenge in the response body

Any x402-aware client (@x402/fetch, x402-agent-tools, ATXP) handles the 402 -> sign -> retry cycle automatically.

Tools

ToolMethodPathPriceDescription
solana_get_priority_feesGET/api/fees$0.003Priority fee estimates for Solana transactions

solana_get_priority_fees

Use this when you need priority fee estimates before sending a Solana transaction. Returns recommended compute unit prices at 6 levels based on recent network activity.

Parameters

NameTypeRequiredDescription
programstringnoProgram ID to get program-specific fees (e.g. JUP6LkbZbjS1jKKwapdHNy74zcZ3tLUZoi5QNyVTaV4 for Jupiter). Optional — omit for global fees.

Returns

  • fees -- object with 6 fee levels in microlamports per compute unit
  • min -- minimum fee observed (cheapest, may fail in congestion)
  • low -- 25th percentile fee (budget transactions)
  • medium -- 50th percentile fee (recommended default)
  • high -- 75th percentile fee (fast confirmation)
  • veryHigh -- 90th percentile fee (priority during congestion)
  • max -- maximum fee observed (guaranteed fast)

Example response:

json
{"fees":{"min":1,"low":100,"medium":1000,"high":5000,"veryHigh":50000,"max":500000},"slot":285432100,"program":"global","updatedAt":"2026-04-13T12:00:00Z"}

When to use: every Solana transaction to set the right priority fee. Essential for Jupiter swaps, NFT mints, token transfers, and program interactions.

Example agent prompts

  • "Priority fee estimates before sending a Solana transaction"

Payment

  • Protocol: x402 -- HTTP-native pay-per-call, no signup, no API key
  • Network: Base L2 (eip155:8453)
  • Asset: USDC
  • Facilitator: Coinbase CDP (primary), PayAI (fallback)
  • Also reachable via ATXP (OAuth-wrapped x402, RFC 9728 protected-resource metadata)

Part of klymax402

100 x402 micropayment APIs for AI agents -- one wallet, USDC on Base, zero signup.

License

MIT

Source: README.md at commit 706d226

Tools

0
SourceWeft has not read this server's tools yet.

Version history

1
  1. v1.1.0LatestSep 16, 2026

Score

50% of the applicable checks met

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  • Reached in the last 30 daysRequired25 pts

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  • Tools listed15 pts

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