pay is a command-line payment layer for APIs that use the x402 or Machine Payments Protocol standards, handling stablecoin authorization and payment proofs through a local wallet before retrying a request. It is designed for command-line tools and AI assistants, and also provides an MCP server plus integrations for supported agent clients.
Borrowing it
Nothing to install: this file belongs to solana-foundation/pay. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/solana-foundation/pay/main/CLAUDE.mdgit clone --depth 1 https://github.com/solana-foundation/payWrote 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.
[](https://agentmods.dev/instructions/solana-foundation/pay/claude-md)<a href="https://agentmods.dev/instructions/solana-foundation/pay/claude-md"><img src="https://agentmods.dev/badge/instructions/solana-foundation/pay/claude-md/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.
<a href="https://agentmods.dev/instructions/solana-foundation/pay/claude-md"><img src="https://agentmods.dev/badge/instructions/solana-foundation/pay/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00007 | $0.00007 |
| Opus 5.5 | $0.00003 | $0.00003 |
| Sonnet 5.5 | $0.00001 | $0.00001 |
| Haiku 4.5 | $0.00001 | $0.00001 |
Grade A, and why
pay CLAUDE.md 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 yesterday.
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.
This is a copy
81% identical to mcp-toolbox AGENTS.md — 3 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
What it actually says
@CONTRIBUTING.md
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.
- yesterday First seen · 2 lines · 7 tokens per session scan A 8a27e12aad1d
pay CLAUDE.md is an instructions file published in the GitHub repository solana-foundation/pay (1,795 stars, last pushed yesterday), licensed MIT. It adds 7 tokens to every session, about $0.0000 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 81% identical to mcp-toolbox AGENTS.md, differing in 3 lines, and is treated as a copy.
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