What is x402-merchant?

An agent for the seller side of x402 payments, a protocol for requesting and verifying payment for online services. It handles payment requirements, incoming payment checks, and paid-plan or credit flows.

Use it to charge for services, verify buyer payment payloads, manage Pro-tier or credit monetisation, and improve the group's net payment position.

It helps services confirm that buyers have paid before providing access and track revenue-related payment flows.

How kwizzlesurp10-ctrl/x402-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to kwizzlesurp10-ctrl/x402-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/kwizzlesurp10-ctrl/x402-mcp/master/.claude/agents/x402-merchant.md

Clone the repo

git clone --depth 1 https://github.com/kwizzlesurp10-ctrl/x402-mcp

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/agents/kwizzlesurp10-ctrl/x402-mcp/x402-merchant/github.svg)](https://agentmods.dev/agents/kwizzlesurp10-ctrl/x402-mcp/x402-merchant)

Your own site

<a href="https://agentmods.dev/agents/kwizzlesurp10-ctrl/x402-mcp/x402-merchant"><img src="https://agentmods.dev/badge/agents/kwizzlesurp10-ctrl/x402-mcp/x402-merchant/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/agents/kwizzlesurp10-ctrl/x402-mcp/x402-merchant"><img src="https://agentmods.dev/badge/agents/kwizzlesurp10-ctrl/x402-mcp/x402-merchant.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 57 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 568 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin unknown No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00057	$0.00568
Opus 5.5	$0.00023	$0.00227
Sonnet 5.5	$0.00011	$0.00114
Haiku 4.5	$0.00006	$0.00057

Measured 2mo ago against content hash f922668fc393, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

x402-merchant scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.claude/agents/x402-merchant.md · 23 lines

The source is not reproduced here

No licence file

Read it on GitHub

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 23 lines · 57 tokens per session scan A f922668fc393

Subscribe to this mod's changes

x402-merchant is an agent published in the GitHub repository kwizzlesurp10-ctrl/x402-mcp (1 stars, last pushed 19d ago), with no licence file. It adds 57 tokens to every session and 568 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Finance and fintech agentic-economy ai-agents base mcp mcp-server modelcontextprotocol

x402-merchant next to 6 agents from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
x402-merchantkwizzlesurp10-ctrl/x402-mcp	Agent	1	19d ago	none	A	57	Claude Code
chainaware-ltv-estimatorChainAware/behavioral-prediction-mcp	Agent	10	2mo ago	MIT	A	297	Claude Code
playwright-test-generatormicrosoft/playwright	Agent	99k	yesterday	Apache-2.0	A	151	Claude Code
.NET-Notebook-Migration-Agentmicrosoft/ai-agents-for-beginners	Agent	79k	4d ago	MIT	A	33	Claude Code
code-revieweranthropics/claude-cookbooks	Agent	54k	2d ago	MIT	A	52	Claude Code
AVM Owner Triagegithub/awesome-copilot	Agent	41k	yesterday	MIT	A	61	Claude Code
Ultimate Transparent Thinking Beast Modegithub/awesome-copilot	Agent	41k	yesterday	MIT	A	11	Claude Code

x402-mcp: Agent for Claude Code