x402 Singularity Layer

x402 is a Web3 payment layer where humans and agents can sell/consume APIs and products. This skill covers the full Singularity Layer lifecycle:

• pay/consume services
• create/manage/list endpoints
• receive and verify webhook payment events
• register agents and submit on-chain reputation feedback

Networks: Base, Ethereum, Polygon, BSC, Monad, Solana
Currency: USDC
Protocol: HTTP 402 Payment Required

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Intent Router

Use this routing first, then load the relevant reference doc.

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Quick Start

1) Install Skill Dependencies

pip install -r {baseDir}/requirements.txt

2) Choose Wallet Mode

Option A: private keys

export PRIVATE_KEY="0x..."
export WALLET_ADDRESS="0x..."
# Solana optional
export SOLANA_SECRET_KEY="base58-or-[1,2,3,...]"

Option B: Coinbase AWAL

# Install Coinbase AWAL skill (shortcut)
npx skills add coinbase/agentic-wallet-skills
export X402_USE_AWAL=1

Use private-key mode for ERC-8004 wallet-first registration. AWAL remains useful for x402 payment flows.

Security note: scripts read only explicit process environment variables. .env files are not auto-loaded.

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Script Inventory

Consumer

Provider

Agent Registry + Reputation

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Core Security Requirements

API Key Verification at Origin (mandatory)

When x402 proxies traffic to your origin, verify:

x-api-key: <YOUR_API_KEY>

Reject requests when missing/invalid.

Credit Economics (provider side)

• Endpoint creation: $1 one-time
• Starting credits: 4,000
• Top-up rate: 500 credits per $1
• Consumption: 1 credit per request
• If credits hit 0, endpoint stops serving until recharged

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Fast Runbooks

A) Pay and Consume

python {baseDir}/scripts/pay_base.py https://api.x402layer.cc/e/weather-data
python {baseDir}/scripts/pay_solana.py https://api.x402layer.cc/e/weather-data
python {baseDir}/scripts/consume_credits.py https://api.x402layer.cc/e/weather-data

B) Discover/Search Marketplace

python {baseDir}/scripts/discover_marketplace.py
python {baseDir}/scripts/discover_marketplace.py search weather

C) Create and Manage Endpoint

python {baseDir}/scripts/create_endpoint.py my-api "My API" https://api.example.com 0.01
python {baseDir}/scripts/manage_endpoint.py list
python {baseDir}/scripts/manage_endpoint.py update my-api --price 0.02
python {baseDir}/scripts/topup_endpoint.py my-api 10

D) List/Update in Marketplace

python {baseDir}/scripts/list_on_marketplace.py my-api \
  --category ai \
  --description "AI-powered analysis" \
  --logo https://example.com/logo.png \
  --banner https://example.com/banner.jpg

E) Webhook Setup and Genuineness Verification

python {baseDir}/scripts/manage_webhook.py set my-api https://my-server.com/webhook
python {baseDir}/scripts/manage_webhook.py info my-api
python {baseDir}/scripts/manage_webhook.py remove my-api

Webhook verification helper:

python {baseDir}/scripts/verify_webhook_payment.py \
  --body-file ./webhook.json \
  --signature 't=1700000000,v1=<hex>' \
  --secret '<YOUR_SIGNING_SECRET>' \
  --required-source-slug my-api \
  --require-receipt

F) Agent Registration + Reputation

python {baseDir}/scripts/list_my_endpoints.py

python {baseDir}/scripts/register_agent.py \
  "My Agent" \
  "Autonomous service agent" \
  --network baseSepolia \
  --image https://example.com/agent.png \
  --version 1.4.0 \
  --tag finance \
  --tag automation \
  --endpoint-id <ENDPOINT_UUID> \
  --custom-endpoint https://api.example.com/agent

python {baseDir}/scripts/list_agents.py --network baseSepolia

python {baseDir}/scripts/update_agent.py \
  --network baseSepolia \
  --agent-id 123 \
  --version 1.4.1 \
  --tag finance \
  --tag automation \
  --endpoint-id <ENDPOINT_UUID> \
  --public

# The same EVM flow also supports:
#   --network ethereum
#   --network polygon
#   --network bsc
#   --network monad

python {baseDir}/scripts/submit_feedback.py \
  --network base \
  --agent-id 123 \
  --rating 5 \
  --comment "High quality responses"

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References

Load only what is needed for the user task:

• references/pay-per-request.md: EIP-712/Solana payment flow and low-level signing details.
• references/credit-based.md: credit purchase + consumption behavior and examples.
• references/marketplace.md: search/list/unlist marketplace endpoints.
• references/agentic-endpoints.md: endpoint creation/top-up/status API behavior.
• references/webhooks-verification.md: webhook events, signature verification, and receipt cross-checks.
• references/agent-registry-reputation.md: ERC-8004/Solana-8004 registration, discovery, management, and feedback rules.
• references/payment-signing.md: exact signing domains/types/header payload details.

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Environment Reference

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API Base Paths

• Endpoints: https://api.x402layer.cc/e/{slug}
• Marketplace: https://api.x402layer.cc/api/marketplace
• Credits: https://api.x402layer.cc/api/credits/*
• Agent routes: https://api.x402layer.cc/agent/*

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Resources

• Docs: https://studio.x402layer.cc/docs/agentic-access/openclaw-skill
• SDK docs: https://studio.x402layer.cc/docs/developer/sdk-receipts
• GitHub docs repo: https://github.com/ivaavimusic/SGL_DOCS_2025
• x402 Studio: https://studio.x402layer.cc

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Known Issue

Solana payments currently have lower reliability than Base due to facilitator-side fee payer infra. Use retry logic in pay_solana.py, and prefer Base for production-critical flows.