MCP connectors for ChatGPT

x402-endpoints

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x402 paid API tools for AI agents on Base: EU/global registries, crypto, wallet & agent trust.

x402-endpoints

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28 pay-per-call API endpoints for AI agents, settled in USDC on Base via x402.

• Gleif Lei: Look up any Legal Entity Identifier (LEI) against the official GLEIF global registry — returns legal name, status, jurisdiction, legal form and registered address, real-time, worldwide cove
• Vies Vat: Validate an EU VAT number against the official EU VIES registry across all 27 member states — returns valid/invalid plus the registered company name and address. Distinguishes 'invalid' (num
• Polymarket Odds: Live prediction market odds and implied probabilities from Polymarket — give a market id or slug, get each outcome with its probability (0-1), volume, liquidity and resolution status.

x402 Freeq One

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Pay-per-call MCP gateway with 15 tools — blockchain, markdown, changelog, ZK proofs, and more.

• Markdown: Fetch a URL and convert its main content to clean, LLM-ready Markdown (strips nav/ads/sidebars). Options: output_format (markdown|text|json), css_selector, max_length, include_links, include
• Token Price: Get the live price of a token by symbol (e.g. ETH, USDC, MATIC).
• Wallet Portfolio: Get a complete wallet portfolio for an Ethereum address: native ETH balance, ERC-20 balances, NFT holdings, recent transfers.

Discover x402 paid APIs and inspect fresh payment requirements before authorizing spend.

Buy private git repos and agent skills with USDC over x402.

x402-list-mcp

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Find and vet x402 payment APIs before your agent pays one: uptime, price, on-chain volume.

Check x402 endpoints before paying: liveness, price history, farm detection.

x402-mcp

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Pay for HTTP APIs and charge for your own: x402 micropayments in USDC on Base.

The complete autonomous agent economy toolkit.

• X402.Discover: Discover paid HTTP APIs in the x402 Bazaar via the facilitator catalog. Call this first to find a resource URL, then x402.probe and x402.pay_and_fetch.
• X402.Probe: Probe a URL for HTTP 402 PAYMENT-REQUIRED terms using the x402 client SDK. Use before x402.pay_and_fetch to inspect price, network, and payTo without spending.
• X402.Pay And Fetch: Pay USDC via x402 and fetch a protected HTTP resource in one call. Requires EVM_PRIVATE_KEY on this host; otherwise use x402.probe for a no-spend 402.

x402-mcp-ser_ver

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A suite of premium MCP tools gated by HTTP 402 USDC micropayments on Base network.

• Generate Synthetic Data: Generates synthetic user profiles, transactions, or IoT streams.
• Crypto Market Analytics: Base network token analytics, DEX liquidity & sentiment.
• Web Content Extractor: Clean markdown & JSON extraction from web URLs.

x402 MCP Starter

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Free self-hosted x402 USDC billing for Cloudflare MCP servers, with a Base Sepolia test endpoint.

x402 Merchant Check

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Pre-payment merchant trust checks for x402 agents on Base and Solana.

x402 Notary MCP

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Cryptographic receipts for AI outputs — signed Ed25519 attestations, Merkle proofs, and Base chain-anchors via x402 USDC micropayments.

• Notarize Inference: Get a cryptographic receipt for one AI inference ($0.001 USDC via x402). This hosted endpoint is challenge-first: it returns the exact payment instructions rather than settling. Fo
• Notarize Batch: Notarize up to 20 inferences in one call ($0.005 USDC via x402). Challenge-first on this hosted endpoint — returns payment instructions.
• Verify Attestation: FREE — verify any attestation: Ed25519 signature check, content-hash recompute, Merkle anchor proof. Supply attestation_id plus either the original content or its content_hash.

Pay-per-call OSINT for AI agents: username + email recon in USDC on Base via x402.

Pay for APIs with USDC.

x402-payment-safety

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Authorize x402 payments before signing with request-bound, signed safety decisions.

x402-plaza-services

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Paid AI agent services for Claude, Cursor, and every MCP client: web scraping to JSON, CAPTCHA solving & Cloudflare bypass, agent code audits &…

• Scrape.To Json: Extract clean JSON from messy HTML
• Security.Audit Agent Code: Security audit for backdoors and data drains
• Credits.Buy Firewall: Buy 1000 prompt-injection scans

x402 Preflight

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Inspect and validate an x402 endpoint before an autonomous agent spends USDC.

x402-receipt-verifier

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Audits NEXUS's own x402 payment logs against its own delivery logs and issues a signed proof-of-deli

x402-seller — rug protection & safe-alpha for trading agents

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Rug-check & launch radar for trading agents: composite honeypot score, EVM+Solana, keyless x402.

x402 Service Discovery

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Discovers x402-payable APIs at runtime.

• X402 Discover: Discover x402-payable services matching a query. Returns matching endpoints with quality signals (uptime, latency, payment details). Each query costs $0.005 USDC via x402 protocol.
• X402 Browse: Browse all registered x402-payable services with optional filtering by category. Returns the full catalog for free — no payment required.
• X402 Health: Check the health and uptime statistics of a specific x402 service by URL. Free — no payment required.

x402-services

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The only x402 MCP server for Robinhood Chain (chainId 4663) - 147 onchain, trading & AI tools.

Pay-per-call browser rendering and x402 marketplace ranking for AI agents, billed via USDC.

x402-solana

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x402 paid API tools for AI agents on Solana: crypto safety, market data, KYB/AML verification.

x402-suite

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Production Model Context Protocol (MCP) Suite of 12 Autonomous Security, Intelligence & Code Remediation Tools with sub-cent x402 protocol settlement on Base…

• Remediate.Code Patch: AST Code Patch & Vulnerability Remediation Generator: Generates ready-to-merge unified git diffs fixing security flaws, missing Schema.org tags, or performance bottlenecks. (Pric
• Signals.Intent Feed: Real-Time B2B Buying Intent & Web3 RFP Stream: Streams verified high-budget software and crypto buyer signals with confidence scoring and pre-drafted outreach angles. (Price: $0.9
• Audit.Smart Contract: Smart Contract Vulnerability & Invariant Security Audit: Automated deep invariant analysis for Solidity and Rust/Anchor contracts with CEI checks and severity breakdown. (Price:

Free, read-only MCP subset of x402 Toolbox's cheap data endpoints, free via MCP.

61 x402 pay-per-call tools that chain: each answer names the next call.

x402-tools

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Pay-per-call x402 tools for AI agents.

• Qr.Generate: Generate a QR code from text or URL. Returns PNG image as base64. Costs $0.01 USDC on Base.
• Qr.Generate Styled: Generate an artistic/styled QR code with custom shapes, colors, and gradients. Costs $0.05 USDC on Base.
• Image.Screenshot: Capture a screenshot of any website. Supports dark mode, full-page, and element selection. Costs $0.05 USDC on Base.

x402-vend — WebIntel

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Pay-per-call web & EU business intelligence for AI agents (x402 USDC on Base).

x402 Web Extract

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Pay-per-use web extract, token prices, and wallet balances via x402 USDC micropayments.