Pulsefeed X402

What Nikolife2016/pulsefeed-x402 MCP server does

Nikolife2016/pulsefeed-x402 MCP server adds pre-payment checks for agents using x402 services. It focuses on whether an endpoint is reachable, whether it produces a valid x402 payment challenge, and whether the payment details show warning signs. Results can include liveness, price, network, a pay-or-avoid recommendation, and trust information.

The service also publishes a working-service feed. That feed ranks x402 endpoints by trust score and is intended to help agents avoid destinations that are unavailable or return invalid challenges. The project describes additional checks for receiver substitution, a mismatch between a listed price and the challenge price, honeypot receivers, and production listings that actually point to a testnet. On-chain proof links on Base may be included in verification results.

How it works

Agents can connect to the hosted MCP endpoint at https://pulsefeed.dev/mcp-server using Streamable HTTP, or run the npm package locally over standard input/output. The repository also publishes a free HTTP verification API at https://pulsefeed.dev/verify?endpoint=<url> and related open data, but those endpoints are separate from the MCP tool interface.

The main workflow is to call check_x402_endpoint with an unfamiliar endpoint before paying it. For a broader discovery workflow, x402_working_services returns currently alive services that provide a valid challenge. The README states that PulseFeed re-probes x402 endpoints daily and maintains trust-related data, while its MCP registry and package drift checks compare current observations with earlier snapshots.

Setup and configuration

Nikolife2016/pulsefeed-x402 MCP server can be run locally with the published npm package:

npx -y pulsefeed-x402-mcp

Alternatively, use the hosted endpoint without installing the package. The README says the free functionality requires no API key and no account. No required environment variables or configuration values are documented in the supplied material.

Tools and capabilities

• x402_working_services: Lists currently alive x402 services that return valid payment challenges and ranks them by trust score.
• check_x402_endpoint: Checks endpoint liveness and challenge validity, then reports payment details and a pay-or-avoid verdict.
• pulsefeed_products: Lists PulseFeed's paid x402 products, including Base-oriented token pulse, whale alerts, smart-money activity, momentum data, and the x402 trust oracle, with payment information.
• The repository README also names mcp_check_server, mcp_drift_check, mcp_security_report, x402_incidents, and x402_changes among the MCP tools. These cover package or server checks, dependency drift, security reporting, incidents, and changes as described by their names in the supplied material.

Limitations and notes

Nikolife2016/pulsefeed-x402 MCP server provides checks and trust data, not a guarantee that a payment is safe. The README distinguishes the free endpoint check from the paid /trust API, which supplies full uptime and reputation information. The product listing also includes paid x402 offerings, so not every capability described by the project is free.

The project emphasizes that historical drift analysis depends on prior snapshots. Its documented registry series begins on 2026-07-30, meaning changes from before that observation period cannot be reconstructed. The README also records that previously published endpoint statistics were corrected after flaws in measurement were found; treat aggregate percentages as project-produced measurements rather than universal guarantees.

The repository is licensed under MIT. It also includes a drift badge, a CI action, free JSON and RSS feeds, and a public dataset, but these are repository or web-service features rather than additional MCP installation requirements.