Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add runxhq/runx --skill x402-paygit clone --depth 1 https://github.com/runxhq/runxWrote 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/skills/runxhq/runx/x402-pay)<a href="https://agentmods.dev/skills/runxhq/runx/x402-pay"><img src="https://agentmods.dev/badge/skills/runxhq/runx/x402-pay/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/skills/runxhq/runx/x402-pay"><img src="https://agentmods.dev/badge/skills/runxhq/runx/x402-pay.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00021 | $0.00378 |
| Opus 5 | $0.00010 | $0.00189 |
| Sonnet 5 | $0.00004 | $0.00076 |
| Haiku 4.5 | $0.00002 | $0.00038 |
Grade A, and why
x402-pay 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 9d 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.
What it actually says
X402 Pay
x402-pay is the public x402 buyer contract. settle submits the exact payment
signal once, and readback performs one observation of that durable payment and
resource. The default pay runner composes both and requires immediate terminal
readback, while durable callers compose settle once and re-enter readback
through Runx's external-job scheduler.
Runx Hosted owns challenge validation, authority attenuation and reservation, wallet or facilitator credentials, payload signing, settlement recovery, finality, and the private ledger. The connector never sleeps or polls; durable continuation cadence belongs to Runx scheduling. OSS contains the public v1 Runx contract and generic provider-effect gate only. References to x402 protocol version 2 in upstream conformance material describe the external standard, not a Runx v2 contract.
Operator guide
Use this skill for one exact HTTPS resource already named by a hosted x402 grant. The resource request carries bounded inline control data or artifact references; large documents and media never travel as oversized graph values. The hosted buyer accepts external x402 V2 only, signs and stages the payload before the paid POST, and reuses those exact bytes after an uncertain response.
Stop on malformed or expired requirements, amount/currency/payee/resource drift, incomplete authority, missing approval, or inconsistent paid-resource readback. Never pass wallet keys, seed phrases, bearer tokens, or facilitator credentials in skill input. A 2xx response is not finality: the readback must return the provider transaction, confirmed chain block, and the paid resource's terminal Runx receipt reference.
What ships with it
4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 9d ago First seen · 38 lines · 21 tokens per session scan A 8fa61bfd7235
x402-pay is a skill published in the GitHub repository runxhq/runx (87 stars, last pushed 3d ago), licensed Apache-2.0. It adds 21 tokens to every session and 378 once invoked, about $0.0001 per session on Opus 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 2026-09-03.
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