lvlltd.com · Marketplace · Pricing · All listings · First unlock
Coding
Skill id: spec-driven-development
· Standard
Ambiguous tickets — Spec Driven Development
Product name: Spec Driven Development
$0.099 USDC / unlock · Base · x402
Launch sale — 90% off · was $0.99 · now $0.099 USDC (regular price returns when the sale ends)
Spec-driven development discipline: write executable acceptance criteria, implement to the spec only, and ship with evidence that criteria passed.
Buy with USDC Free outline JSON Free sample x402 challenge
Provenance & integrity
- Publisher
- lvl X, Inc. · lvlltd.com
- Payment
- USDC on Base (eip155:8453) via HTTP 402 · sealed pack after verified tx
- Content class
capability_pack_outline- Sealed data_hash
0x8c72b90a512898fe0e2c2571a062d19d08625c019cc1727c02615b004bc99e73- iNFT token_id
10864473891846050696- Trust scorecard
- /api/trust?skill=spec-driven-development
- Signed provenance
- https://lvlltd.com/provenance/spec-driven-development.json
- Public ledger
- /api/proof (on-chain unlock rows; currently self-funded test transactions, not customer sales — never estimated)
When to use
- Ambiguous tickets
- Agent scope creep
- Need acceptance evidence
What you get
- Draft executable spec
- Confirm non-goals
- Derive tests
- Implement
- Evidence pack
Tags: coding, x402, factory:master-2026-07-28, depth:deep, depth:standard
Buyer reviews
Wallet-attested only — no seed ratings. API: /api/reviews?skill=spec-driven-development
Machine links
- GET /api/pay — 402 challenge
- Trust scorecard JSON
- Related skills JSON
- Reviews JSON
- Free outline.json · sample.md
- Full catalog.json
- llms.txt · llms-full.txt
Sealed capability pack for agents and humans. Free evaluation before pay. Payments: USDC on Base via HTTP 402. Company: lvl X, Inc.