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 wedabro/bro-skills --skill speckit.payment-fintechgit clone --depth 1 https://github.com/wedabro/bro-skillsWrote 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/wedabro/bro-skills/speckit.payment-fintech)<a href="https://agentmods.dev/skills/wedabro/bro-skills/speckit.payment-fintech"><img src="https://agentmods.dev/badge/skills/wedabro/bro-skills/speckit.payment-fintech/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/wedabro/bro-skills/speckit.payment-fintech"><img src="https://agentmods.dev/badge/skills/wedabro/bro-skills/speckit.payment-fintech.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 | $0.00031 | $0.00904 |
| Opus 5.5 | $0.00012 | $0.00362 |
| Sonnet 5.5 | $0.00006 | $0.00181 |
| Haiku 4.5 | $0.00003 | $0.00090 |
Grade A, and why
speckit.payment-fintech 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 1mo 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.
How it starts
The opening of the file, as written. The whole thing — 60 lines — stays where its author put it; the contents beside it link to each section on GitHub.
🎯 Mission
Architect and build zero-defect financial, payment, and ledger systems. Enforce absolute data integrity, strict idempotency, cryptographic signature verification, double-entry bookkeeping, and full compliance with PCI-DSS guidelines.
📥 Inputs and Outputs
- Input: Feature spec, plan, tasks, payment gateway specs (Stripe, ZaloPay, VNPay), currency precision rules, refund policies, and regulatory requirements.
- Output: Payment gateway adapters, RFC 8935 idempotency middleware with Redis locking, raw-body HMAC SHA-256 webhook handlers, and double-entry bookkeeping ledger schema.
📋 Protocol
1. Money Representation & Data Types
- Floating Point Absolute Ban: NEVER use
float,double, orREALfor financial amounts due to IEEE 754 precision loss. - Integer Standard: Store amounts in smallest currency units (e.g., cents for USD/EUR, single unit integer for VND/JPY).
- Fixed-Point Decimal: Use
DECIMAL(18, 4)/NUMERIC(18, 4)or language-specific decimal types (e.g. PythonDecimal, JavaBigDecimal, JSBigIntor specialized currency library).
2. Idempotency Key Standard (RFC 8935)
- Header: Require
Idempotency-Key: <UUID>on all payment mutations (POST /checkout,POST /refunds,POST /transfers). - Storage & Locking:
- Acquire atomic distributed lock on
idempotency:<user_id>:<key>in Redis. - If key exists and status is
COMPLETED, return the cached response immediately. - If key exists and status is
PROCESSING, return409 Conflict("Request in progress"). - Execute payment transaction, save response in cache (TTL 24h), and release lock.
- Acquire atomic distributed lock on
3. Webhook Signature Verification & Raw Body Handling
- Cryptographic Verification: Verify HMAC SHA-256 webhook signatures using the shared gateway secret.
- Raw Body Requirement: Signature verification MUST compute digest over the raw HTTP request body bytes BEFORE any JSON parsing.
- Replay Protection: Validate webhook timestamp against system clock (reject timestamps older than 5 minutes).
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.
- 1mo ago Changed · -4 lines 95db62ac708f
- 1mo ago First seen · 64 lines · 31 tokens per session scan A 21cef847ad00
speckit.payment-fintech is a skill published in the GitHub repository wedabro/bro-skills (3 stars, last pushed 14d ago), licensed MIT. It adds 31 tokens to every session and 904 once invoked, about $0.0001 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.
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