Paid HTTP APIs that AI agents auto-pay per-call (x402 and USDC)

Royal Agentic — x402 Portfolio | x402-portfolio

x402-portfolio

Royal Agentic — x402 Portfolio

Seven production-live x402 paid HTTP APIs. All running on Base mainnet (eip155:8453) with the Coinbase CDP facilitator, real USDC settlement, and Bazaar discovery extensions. Single receive wallet: 0x9e6A0CE78Bb2915d0758cc6A1cE8eA77f1B71770.

Service Endpoint Price What it does

TradingAgents x402 POST /api/analyze-ticker $1.00 Multi-agent LLM ticker consensus — five specialist analysts + bullish/bearish debate + trader synthesis + risk review + portfolio-manager final BUY/HOLD/SELL

Sentry Forge x402 POST /api/dispute-pack $0.50 Generate an 8-file consumer-debt dispute pack (FDCPA/FCRA-grounded): collector + original-creditor letters, CFPB complaints, credit-bureau disputes, court-records search guide, action checklist, evidence inventory

Royal Ruby x402 POST /api/law-lookup $0.05 US consumer-rights law citation lookup (FCRA, FDCPA, TILA, state UDAP statutes, debt-collection rules, credit-reporting timelines) — information-only, no legal advice

Vault Pro x402 POST /api/scaffold-project (also /scaffold-agent) $0.05 Obsidian project + agent scaffolder — returns complete markdown (frontmatter + Goal + Success criteria + Decomposition table + Hermes coordination notes) fitted to the Vault Pro 70-Templates structure

Nano Banana x402 POST /api/generate-image (also /edit-image) $0.02 Paid Gemini image generation — gemini-3.1-flash-image-preview wrapped with x402 micropayments. Generate from prompt or edit existing image. Returns base64 PNG, 10 aspect ratios

Power Pack x402 POST /api/score-email $0.01 Outreach email scorer (Claude Haiku 4.5) — scores subject + body + open rate + spam risk + tone + length + personalization + CTA. Returns top-3 specific improvements + rewritten subject

SupraPack x402 POST /api/find-skill $0.01 Claude skill discovery over a 531-skill curated bundle. Returns top matching skills with full markdown content, quality score, categories, source repo. Optional min_quality, categories, limit filters

Try one (paid call)

x402 servers require a signed payment header. The easiest way to call them is with a wallet-equipped client like x402-proxy:

npx x402-proxy https://suprapack-x402.fly.dev/api/find-skill \ --body '{"query":"stripe webhook","limit":3}'

Or use the official Python SDK:

from x402 import x402Client from x402.mechanisms.evm.exact import ExactEvmScheme

client = x402Client() client.register("eip155:*", ExactEvmScheme(signer=my_signer))

Hit the endpoint — client auto-handles the 402 challenge

resp = client.post( "https://power-pack-x402.fly.dev/api/score-email", json={"subject": "Quick question about your API rollout", "body": "Hey , ..."}, )

Discovery

Each endpoint emits a full Bazaar discovery extension in its 402 response, including:

canonical accepts block (scheme, network, amount, asset, payTo)

extensions.bazaar.info with input/output schemas and a worked example

machine-readable JSON Schema for the request body

This means agents browsing the x402 Bazaar (or any vector-indexed registry like x402scan) auto-discover these endpoints by capability — no manual onboarding required.

To see a 402 challenge yourself:

curl -i -X POST https://tradingagents-x402.fly.dev/api/analyze-ticker \ -H 'content-type: application/json' \ -d '{"ticker":"NVDA"}'

The payment-required header is base64-encoded JSON. Decode it:

curl -sI -X POST https://tradingagents-x402.fly.dev/api/analyze-ticker \ -H 'content-type: application/json' \ | awk '/^payment-required:/ {print $2}' | tr -d '\r' | base64 -d | jq

Reliability

A daily GitHub Actions cron (x402 daily Bazaar self-ping) hits all seven /health endpoints + verifies every 402 challenge still reports eip155:8453, the expected price, and the correct payTo. Failure emails the operator.

Every successful paid call also emits one [LEDGER] JSON line to Fly logs (timestamp, app, endpoint, price, network, payTo, ok, latency) for per-call revenue and latency audit.

Architecture

All seven services share the same proven stack:

Node 22 + Express 5 thin wrapper

@x402/express payment middleware (mainnet via @coinbase/x402 CDP facilitator)

@x402/extensions/bazaar for Bazaar discovery metadata

Python subprocess for LLM-heavy services (sentry-forge-x402, tradingagents-x402)

Direct Anthropic / Google client for Node-only services

Fly.io deployment (shared-cpu-1x to shared-cpu-2x, auto-stop)

Source repos under bshelby88 on GitHub.

License

Each service ships under its own license (mostly ISC) — see individual repos.

Built by Bryant Shelby / Royal Agentic Enterprises. Contact: [email protected].