{"uid":"cap_9EXymoDBwM61QJuM-IVbT","slug":"flat-rate-x402-mcp-server-28-tools-b864c435","name":"Flat-rate x402 MCP Server (28 Tools)","description":"MCP server exposing 65 tools - LLM completion, read-only EVM tooling and pure crypto utilities. initialize and tools/list are free so any client or directory can enumerate the tools; only tools/call is charged, a flat $0.001 per call.","url":"https://flat-rate-llm.kikoribera03.workers.dev/mcp","method":"POST","headers":{},"bodySchema":null,"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.001","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.001/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_rBTVtZIzxFZfxxfeumS9g","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Exposes 28 tools — LLM completion, read-only EVM utilities, and crypto primitives — via a single MCP endpoint charged at a flat $0.001 per tools/call invocation, with free enumeration.","exampleAgentPrompt":"List all the tools available on this MCP server, then call the Keccak-256 tool to hash the string 'hello world' — I'm happy to pay the $0.001 per call fee via x402.","exampleUseCases":[{"title":"On-chain nonce check before transaction","prompt":"Before I send this transaction, use the MCP server's nonce tool to check the current transaction count for wallet address 0xAbCd1234... on Ethereum mainnet so I know the right nonce to use."},{"title":"LLM completion without an API key","prompt":"I need a quick LLM completion — ask the flat-rate MCP server to finish this prompt for me: 'The three most important things about distributed systems are' — no account setup, just pay the $0.001 per call."},{"title":"Gas fee estimation for EVM transaction","prompt":"What are the current recommended maxFeePerGas and maxPriorityFeePerGas on Base mainnet? Use the EIP-1559 fee suggestion tool on the MCP server to get a slow, medium, and fast estimate."}],"resultDescription":"Returns standard MCP JSON-RPC responses: tools/list returns a manifest of all 28 available tools with their schemas; tools/call returns the tool-specific output such as LLM text, hashed values, EVM data, encoded strings, or advisory content. The response is a structured JSON object matching the called tool's output schema.","failureModes":["Payment not attached or insufficient: endpoint returns HTTP 402 with payment requirements","Invalid tool name in tools/call: returns MCP error with unknown tool message","Malformed tool arguments: returns MCP validation error describing the schema mismatch","Unsupported EVM chain ID: EVM tools return an error indicating the chain is not supported","Network timeout on underlying provider: propagated as MCP internal error","tools/list called with POST but missing JSON-RPC envelope: returns parse error"],"whenToPreferThis":"Choose this endpoint when you need a breadth of lightweight utilities — LLM completion, EVM read operations, and crypto primitives — through a single MCP-compliant interface with no account registration, no API keys, and predictable flat-rate micropayment pricing ($0.001/call via x402). Ideal for agents that want to enumerate available tools at zero cost and then pay only for what they call. Less suitable when you need high-volume LLM calls with token-level pricing, write operations on-chain, or WebSocket streaming.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T18:45:57.584Z","isFirstParty":false}