# orbit x402 Picks

> Tell it what your agent needs ("scrape a page to markdown", "token price on base"); get the 5 x402 endpoints worth paying for, ranked by relevance, real paying users, recency, price and liveness. $0.005 per call via x402 (USDC on Base). No account, no API key. By orbit-builder.

## Paid (x402 v2, exact, eip155:8453, USDC 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, payTo 0x9Da4B249B8afa7818de5BFf7eEd8b13e6feeb9b3, amount 5000 = $0.005)

- GET https://x402-picks.orbit-builder.workers.dev/v1/recommend?task=<need>&chain=base&max_price=0.01&limit=5
- POST https://x402-picks.orbit-builder.workers.dev/v1/recommend  {"task": "...", "chain": "base", "max_price": 0.01}
- GET https://x402-picks.orbit-builder.workers.dev/recommend?need=<need>&max_price_usd=0.01&chain=eip155:8453  (alias)

Params: task (aliases need, q, query; required), chain (base, solana, polygon, arbitrum, ... or CAIP-2; comma list), max_price (USD), limit 1-10, live=1 (only endpoints that returned 402 on our last probe), method (GET|POST|MCP), view=full (score breakdown + input example).

Each pick: rank, url, method, service, description, price_usd, networks, demand {unique_payers_30d, calls_30d, last_called_at}, liveness (402_ok | reachable_no_402 | unknown), score, how_to_call.

## Ranking

score = 0.5 BM25 relevance (name, tags, path, description; light synonym expansion) + 0.12 query-term coverage + 0.2 demand (log unique payers, 30d) + 0.08 recency of last paid call + 0.05 price + 0.05 liveness. Endpoints that are gone (DNS fail, 404/410) are removed. Max 2 picks per host. No paid placement; the operator's own endpoints get no boost.

Index: 9664 endpoints (from 38456 in CDP Bazaar discovery; kept: >=2 unique payers in 30 days, mainnet payment option). Built 2026-10-24T06:02:25.389Z; rebuilt every 6 hours with a fresh liveness probe (one unpaid request per endpoint).

## Free

- GET https://x402-picks.orbit-builder.workers.dev/v1/preview?task=<need> (top 1 pick + next_step)
- https://x402-picks.orbit-builder.workers.dev/openapi.json, https://x402-picks.orbit-builder.workers.dev/.well-known/x402, https://x402-picks.orbit-builder.workers.dev/.well-known/agent.json, MCP at https://x402-picks.orbit-builder.workers.dev/mcp (tool recommend_x402_endpoint, top 1)

Price note: agents-trust /recommend charges $0.01 per call (Oct 23 2026); this is $0.005.