Ask x402station whether a given x402 URL is safe to pay. Returns {ok, warnings[], metadata}. Costs $0.001 USDC (auto-signed with AGENT_PRIVATE_KEY). Call this BEFORE any other paid x402 request to avoid decoys (price ≥ $1k), zombie services, and dead endpoints. ok:true only when no critical warning fires.

Deep history for one x402 endpoint: hourly uptime over 7 days, latency p50/p90/p99, status-code distribution, concentration-group stats (how crowded this provider's namespace is), and a decoy probability score [0, 1]. Costs $0.001 USDC. Superset of preflight — if you're running forensics you don't need preflight too.

Returns every active x402 endpoint currently flagged decoy_price_extreme / zombie / dead_7d / mostly_dead in one JSON payload, plus per-reason counts. Costs $0.005 USDC. Pull periodically (hourly/daily) and cache locally as a blacklist — cheaper than preflighting every URL.

Bulk-prepaid preflight bundle. Pay $0.50 USDC once for 1000 prepaid /api/v1/preflight calls. Effective rate $0.0005/call (50% off the per-call $0.001 tier). Returns { creditId, balance: 1000, expiresAt }. STORE THE creditId — it's the bearer token and is not retrievable later. Pass it via X-Credit-Id header on subsequent /api/v1/preflight calls; on exhaustion (balance=0) or expiry (90 days) the middleware falls through to per-call x402 automatically. Use this once you've decided to do high-volume preflight work.

Free, no payment required. Returns { creditId, balance, initialBalance, used, paidAmount, createdAt, expiresAt, expired, paymentTx, paymentNetwork }. UUID-only access — anyone holding the creditId can read state, same as decrement. 404 covers both 'malformed UUID' and 'no such credit' (same body so an attacker scraping random UUIDs can't tell them apart).

Polling-friendly catalog diff. Body { since?, limit? } (default since=now-24h, limit=200, max 500). Returns added_endpoints[] (first_seen_at >= since AND is_active=true), removed_endpoints[] (flipped to is_active=false since), service-level counts, polls_in_window, and current active totals. Cheap ($0.001 USDC) so hourly polling stays under $1/month — perfect for aggregator agents that need a fresh delta without re-pulling the whole catalog. Internal ingest cron runs every 5 min, so polling more often than that returns identical data.

Given a URL flagged by preflight (or a taskClass hint), returns up to 5 healthy sibling endpoints in the same provider/domain/category/price-band. Filters out 7-day-dead and 1-hour-erroring candidates; ranks by uptime + latency. Costs $0.005 USDC. Use this immediately after preflight returns ok=false — it answers 'where do I go instead?'. Pass {url} when you have a specific URL the agent was about to pay; pass {taskClass} (e.g. 'llm-completions', 'Inference') when discovering by service category; or both for a richer match.

Pay $0.01 USDC for a 30-day watch + 100 prepaid alerts on one x402 endpoint. When subscribed signals fire or clear (e.g. endpoint goes zombie, price flips to decoy_price_extreme), x402station POSTs a JSON payload signed with HMAC-SHA256 to your webhookUrl. Returns watchId + secret — STORE THE SECRET, it's the HMAC seed for verifying delivery payloads and is not retrievable later. signals defaults to the critical preflight subset {dead, zombie, decoy_price_extreme}; pass other names to subscribe to non-critical signals too.

Returns the current state of a watch: active/expired, alerts remaining (out of 100 prepaid), last 10 alert deliveries with their delivery_status, and the last computed signal snapshot. Free — no payment required, secret-gated. The secret is the one returned by watch_subscribe.

Deactivates the watch — no further alerts will be queued or delivered. The subscription is set is_active=false but the row + alert history is retained for audit. Free — no payment required, secret-gated. There is no refund for unused prepaid alerts.