Payment infrastructure for AI agents that lets them pay for certain online APIs using credits. It supports x402 micropayments, a web payment method for API requests that require payment; MPP support is planned.

Making requests to paid API endpoints, handling HTTP 402 payment-required responses, and finding available paid endpoints.

It removes the need to manage cryptocurrency wallets or blockchain transactions when accessing paid APIs.

httpayer — Skill by HTTPayer

Install

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.

agentmods

npx agentmods add skills/httpayer/mcp/mcp

Any agent

npx skills add HTTPayer/mcp --skill mcp

Clone the repo

git clone --depth 1 https://github.com/HTTPayer/mcp

Made for: Claude Code, Codex.

Per session 138 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,227 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

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	$0.00138	$0.02227
Opus 5	$0.00069	$0.01113
Sonnet 5	$0.00028	$0.00445
Haiku 4.5	$0.00014	$0.00223

Measured yesterday against content hash e360c0a13e22, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

httpayer 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.

SKILL.md · 248 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.

yesterday First seen · 248 lines · 138 tokens per session scan A e360c0a13e22

Subscribe to this mod's changes

httpayer is a skill published in the GitHub repository HTTPayer/mcp (2 stars, last pushed 4mo ago), with no licence file. It adds 138 tokens to every session and 2,227 once invoked, about $0.0007 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 2026-08-31.

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