Every agent-payable API.

Cheap connectivity-check endpoint. Verifies the full x402 settlement path (signature -> CDP facilitator -> on-chain transferWithAuthorization) for $0.01 so AI agents can validate wallet + network + facilitator wiring before committing to higher-value AML calls.

ChainQuery Bitcoin Intelligence: independent Bitcoin-native on-chain data over x402, no API key. Top 10 addresses by balance from the weekly UTXO-set snapshot, with labels.

ChainQuery Bitcoin Intelligence: independent Bitcoin-native on-chain data over x402, no API key. Full HODL-waves history: supply split across 12 age bands per weekly snapshot.

Check — an agent-callable check service, payable over x402 (USDC on Base). Provided via Apify. Priced around 0.002 USD per call.

Check budget and approve/deny AI agent spending with x402 payment verification

Check if we've hit the bottom

Check whether a crypto address appears on the US OFAC sanctions list before transacting - a compliance must-have for agents that LLMs cannot verify against live lists. ofac check, sanctioned address, sanctions screening, compliance check, blacklist address, sdn list

Check whether a smart contract's source code is verified on the block explorer, with contract name, compiler and proxy status across Ethereum/Base/Arbitrum/Optimism/Polygon/BSC - a pre-interaction safety check agents need that LLMs cannot perform live. contract verified, source code verified, contract audit, unverified contract, contract safety, is contract safe

Chinese Convert — an agent-callable chinese convert service, payable over x402 (USDC on Base). Provided via 2s.io. Priced around 0.001 USD per call.

Chinese Detect — an agent-callable chinese detect service, payable over x402 (USDC on Base). Provided via 2s.io. Priced around 0.001 USD per call.

Chinese Pinyin — an agent-callable chinese pinyin service, payable over x402 (USDC on Base). Provided via 2s.io. Priced around 0.001 USD per call.

Person research for genealogy and family-history agents. Finds ancestors and historical figures across digitized newspaper archives.

Obituary research for genealogy and family-history agents. Returns death notices, survivor lists, and genealogical detail from historical newspaper archives.

Cid Bafkreibed3rrvo5cmzfwvytbmkqpgn5m7ays5cotf2agweycev5ibirl4m — an agent-callable cid bafkreibed3rrvo5cmzfwvytbmkqpgn5m7ays5cotf2agweycev5ibirl4m service, payable over x402 (USDC on Base). Provided via testgateway.mattober.com. Priced around 0.00001 USD per call.

Cid Bafybeibflo5qiryeuupzuayowoi5qsillk3bij7yaizld2jvma3ah6cgdi — an agent-callable cid bafybeibflo5qiryeuupzuayowoi5qsillk3bij7yaizld2jvma3ah6cgdi service, payable over x402 (USDC on Base). Provided via x402hackathon.mypinata.cloud. Priced around 1 USD per call.

Cid Bafkreifqwob76i3msvcy7i5cevl7vjuode2kezzumvjxudnoarbuvwnw3y — an agent-callable cid bafkreifqwob76i3msvcy7i5cevl7vjuode2kezzumvjxudnoarbuvwnw3y service, payable over x402 (USDC on Base). Provided via peach.mypinata.cloud. Priced around 0.001 USD per call.

Bibliography verification for AI research agents — POST up to 20 citations (DOIs or free-text references) and get a per-reference verdict: exists/not-found, retracted/withdrawn (Crossref + Retraction Watch + OpenAlex), and title/author/year mismatches against a real record. Built for agents auditing LLM-generated bibliographies before a citation ships.

Hospital price lookup for healthcare and patient-advocate agents. Returns published prices, the Medicare benchmark, and a negotiation script for any procedure at a given hospital.

Is wildfire smoke affecting the air here right now? Smoke tracker — AQI estimate, nearby active fires, health risk level, mask and indoor-air guidance, and evacuation status for any location.

What can I plant right now? Growing-season intelligence — USDA hardiness zone, last/first frost dates, and a planting calendar (what to plant now, start indoors, or plan for the next 4 weeks) with frost-protection and season-extension tips.

Clinical trial pipeline scan for any disease — all active Phase 2/3 trials with trial counts, sponsor landscape, geographic distribution, mechanism breakdown and pipeline density, across 400,000+ trials worldwide. For biotech-investing and pharma agents.

CodeNut Credit x402 Offer - $10 to get 100x worth of CodeNut credits!

Is crypto risk-on right now? One $0.001 answer: whether the BTC 200-day master gate is open or closed, the LONG/CASH state for the BTC and ETH sleeves, and the one-line verdict — all evaluated on UTC daily closes by a long-only rules engine. The cheapest crypto regime check on x402: poll it every cycle, buy the fuller reads only when the gate state changes. Research, not advice.

Bitcoin and Ethereum trend signal — is crypto risk-on right now? One read returns the long-only trend state for BTC and ETH (LONG or CASH per sleeve), each sleeve's 50-day trend gate, and the BTC 200-day master gate that overrides both — all evaluated strictly on UTC daily closes, with live price and day change. A rules-based regime verdict for agents, not raw price data. Long-only: the answer is in or out, never short. Research, not advice.

Index scores for trading agents — how strong is each major index right now? One read returns the scored index row per book: S&P 500 (SPY) and Nasdaq-100 (QQQ) plus the macro and BTC/ETH crypto books — 0-100 opportunity score, percentile, green/yellow/red light and entry state for each index, with every book's regime verdict alongside. The cheapest top-down read of the whole tape. Refreshed ~5 min in market hours, timestamped. Research, not advice.

The whole market read in one small answer — a morning brief for agents: the regime verdict per book (S&P 500, Nasdaq-100, macro, BTC/ETH crypto), today's top-5 ranked buy candidates, the day's biggest gainers and losers, and the crypto trend-gate state. One $0.02 call instead of four — the cheapest complete top-down read on x402. Refreshed ~5 min in US market hours, timestamped. Research, not advice.

Point-in-time score history — what did Coil actually publish on a given date? Returns the as-published per-name scores (opportunity percentile, entry quality, hold strength) for every S&P 500 / Nasdaq-100 / macro name on any archived date (?date=YYYY-MM-DD; omit for the list of archived dates). Lookahead-bias-clean by construction: served verbatim from the append-only publish log, never recomputed. Immutable: one new date per session, never revised. Research, not advice.

Scores for the most-traded US stocks — the liquid mega-caps agents actually trade. One read returns the top names by 20-day average dollar volume in every S&P 500 sector, each scored: opportunity 0-100 plus board percentile, entry state (READY / SETUP / WAIT / CHASE / FALLING), hold strength, leadership flag, and the dollar-volume figure that ranked it. High-liquidity names only, no illiquid tail. Refreshed ~5 min in market hours. Research, not advice.

TradFi risk-on/risk-off in one $0.003 call for crypto agents. Returns the S&P 500 and Nasdaq-100 regime state, how many equity sectors are green out of 11 (breadth), whether the permission ladder allows risk at all, and the same engine's BTC/ETH trend gate — size against equity risk appetite instead of guessing. Regime states flip rarely (days, not minutes); recomputed ~5-9 min in-session by a live long-only engine scoring ~560 US names. Research, not advice.

CoinGlass provides users with comprehensive cryptocurrency derivative market data, including price trends, cryptocurrency futures trading volumes, open interest, funding rates, liquidations, options data, etc., through multiple data analysis methods and technical means, and supports users to customize indicators and strategies. | Powered by Questflow

CoinGlass provides users with comprehensive cryptocurrency derivative market data, including price trends, cryptocurrency futures trading volumes, open interest, funding rates, liquidations, options data, etc., through multiple data analysis methods and technical means, and supports users to customize indicators and strategies. | Powered by Questflow

Coinbase CDP facilitator — Circle USDC on Base (fee-free). First settlement auto-lists in x402 Bazaar.

CoinStats DeFi positions for a wallet — staked, lent, borrowed, LP balances across protocols (Aave, Lido, Uniswap, Curve, etc.)

Population report & grade scarcity: PSA/PCGS/CGC census lookup for any graded card, coin or comic. Returns how many exist at each grade, pop-with-higher, and scarcity analysis to gauge true rarity. Worldwide. For collector and investor agents.

Collectibles insurance guide: how to insure a card, art, watch, comic or memorabilia collection. Returns specialist insurers, coverage types, appraisal requirements, and documentation needed to protect a collection. Worldwide. For collector and appraiser agents.

Collectible value & price check: trading card value, graded card (PSA/BGS/CGC) price, coin value, comic & vinyl record price. Returns current market value by grade and condition with recent sold comparables (eBay/Discogs) for any item: cards, coins, comics, watches, sneakers, vinyl. Worldwide. For collector and investor agents.

How to store & preserve a collectible: storage methods and product recommendations for cards, coins, comics, vinyl, watches and memorabilia, controlling for humidity, light and handling. Worldwide. For collector agents.

Card grading guide: is this card/coin/comic worth grading, and which service? Returns which grading service to use (PSA, BGS, CGC, PCGS, NGC), cost, turnaround time, and whether grading adds value for any collectible. Worldwide. For collector and investor agents.

Complete directory of all known x402-enabled services with pricing, categories, and status. Curated by httpay.xyz.

Complete wallet portfolio breakdown showing all token holdings and USD values. (with AI analysis)

Compliance — an agent-callable compliance service, payable over x402 (USDC on Base). Provided via onchainpulse.theaslangroupllc.com. Priced around 0.15 USD per call.

Composed DAO governance translator. Takes a Snapshot or Tally proposal URL, fetches structured data + summary via /api/governance/summarize, then produces a 2-3 sentence plain-language translation + domain band (economic_param / treasury / code_upgrade / governance_meta / social_signal). 1-year cache — proposals are immutable.

Composed token classification. Fans out to token_info, token_security, protocol_tvl and returns a single archetype (stablecoin / blue_chip / mid_cap / memecoin / wrapped / governance / unverified) plus a plain-language verdict.

Composed wallet behavioral thesis. Fans out to balance, wallet_persona, wallet_pnl, wallet_anomaly and returns a plain-language summary of the wallet's investing posture plus archetype (trader / hodler / yield_farmer / mev_bot / compromised / inactive).

Composed wallet threat brief. Fans out to wallet_risk, wallet_anomaly, privacy_mixer_risk, budget_guardian, and wallet_persona and returns a 2-3 sentence security verdict + band (clean / watch / elevated / critical). Replaces a manual 5-call security audit walk.

Comprehensive reference detailing the structure of system prompts and the conventions for function calls used by AI agents, aiding developers in understanding and implementing consistent agent behavior. | Powered by Questflow

Compute the 4-byte function/error selector and full keccak topic from a solidity signature, e.g. transfer(address,uint256). For decoding tx input prefixes and matching event topics. function selector, 4byte, method id, event topic, keccak signature

Risk Contextual — an agent-callable risk contextual service, payable over x402 (USDC on Base). Provided via Apify.

Convert an amount between two currencies with synthesized bid/ask spread and effective rate. Query: ?from=USD&to=EUR&amount=100&spread_bps=50. Source: ECB via frankfurter (keyless).

Convert AUD to JPY at live rate. Pass ?amount=100 for value in Japanese Yen. 澳元兑换日元换算。豪ドルを円に換算。Convertir dólar australiano a yen. 호주 달러를 엔로 환전. aud to jpy convert.