Games & fun

Coin Flip · Coinflip

Coin Flip · coinflip402.vercel.app

Flip a coin for a small USDC payment on Base mainnet. Returns heads or tails.

$0.001 Base 203 paid calls

Useless Fact · Useless Fact

Useless Fact · x402uselessfacts.vercel.app

Pay a tiny amount of USDC and receive one delightfully useless fact.

$0.001 Base 200 paid calls

Fortune Generator · Fortune

Fortune Generator · ladyfortunalx402.vercel.app

Get a random fortune via x402 payment on Base mainnet.

$0.001 Base 192 paid calls

Dice Roller · Dice

Dice Roller · dicex402.vercel.app

Roll a dice with any number of faces. Specify faces via ?faces=N query parameter.

$0.001 Base 191 paid calls

Meme Generator · Generate Meme

Meme Generator · memegeneratorx402.vercel.app

Generate a captioned meme image. Pay per request in USDC on Base mainnet.

$0.001 Base 189 paid calls

Riddle Oracle · Riddle

Riddle Oracle · riddlex402.vercel.app

Pay a micro-fee in USDC on Base mainnet to receive a riddle and its answer.

$0.002 Base 185 paid calls

Random Fact · Random Fact

Random Fact · randomfactsx402.vercel.app

Returns a single random fact as JSON in exchange for a micropayment.

$0.001 Base 137 paid calls

Random Joke API · Jokes

Random Joke API · jokes-endpoint.vercel.app

Get a random interesting joke. Secured with x402 payment protocol on Base mainnet.

$0.002 Base 122 paid calls

Crypto prediction markets on Polymarket: the highest-volume open BTC, ETH and crypto markets with live odds (outcome probabilities), best bid/ask, spread, 24h + total volume, liquidity, price change and end date. "Bitcoin above X", price targets, ETF and protocol events — what the prediction market ACTUALLY prices in, as flat JSON refreshed every 5 minutes. Crypto odds, Bitcoin prediction market, ETH probability. $0.001 per call.

$0.001 Base 100% up 61 paid calls

Random · Random

Random · agent402.tools

Cryptographically secure randomness. ?bytes=1..1024 returns hex; or ?min=&max= returns a uniform integer; ?count=1..100.

$0.001 Base 100% up 51 paid calls

Verifiable Randomness · Rand

Verifiable Randomness · x402.shizu.me

Cryptographically-secure randomness with a receipt. GET ?bytes= returns hex (1-256 bytes); add ?min=&max= for a uniform integer in an inclusive range. Each response carries a request_id and timestamp — unbiased entropy an agent can cite to a counterparty, not a seeded PRNG. Need provable fairness over time? /rand/commit does commit-reveal (commitment now, value later).

$0.003 Base 100% up 30 paid calls

x402-factory · Evergreen Presidential Election Winner Party

x402-factory · x402-factory.com

Live probability: Which party wins the next US presidential election? — Stable evergreen URL for a recurring question: Which party wins the next US presidential election? Auto-resolves to the current market instance and rolls forward on resolution, so the answer is always about the next occurrence. Response adds current_slug and rolls_to_next_at to the standard probability shape.

$0.02 Base 24 paid calls

Roll · Roll

Roll · api.anchor-x402.com

Verifiable RNG — cryptographically-random integer(s) signed by the treasury key. Drop-in VRF for game studios. $0.001 USDC.

$0.001 Base 100% up 23 paid calls

Nickeljoke · Joke

Nickeljoke · nickeljoke.vercel.app

Premium AI joke generation

$0.005 Base 22 paid calls

Otto AI · PM Markets

Otto AI · x402.ottoai.services

Top Polymarket prediction markets RIGHT NOW: the 25 highest-volume open markets with live odds (outcome probabilities), best bid/ask, spread, last trade price, 24h + total volume, liquidity, 1d/7d price change, end date and event link. Flat JSON, refreshed every 5 minutes. Prediction market odds, Polymarket data, event probabilities, market sentiment. $0.001 per call.

$0.001 Base 100% up 19 paid calls

Speccy · Predictions Polymarket

Speccy · api.speccy.cloud

Top Polymarket prediction markets by 24h volume. Returns up to 50 markets with id, question, slug, volume, volume24hr, liquidity, endDate, outcomes and outcomePrices.

$0.01 Base 16 paid calls

Truth Bear · Gauge Esgfund Region

Truth Bear · api.truthbear.co

[3-LEG] ESG fund greenwash chain, one fund (?entity=blackrock-art9-downgrade): leading label pressure, SFDR Article 9 to 8 downgrade and ESG name removal -> current current classification -> realized rating de-listing and lifecycle (confirmation gate). A chain, not one reading: confidence = how many legs are lit, in order. Sources: SFDR filings and rating registries. Descriptive only, never a forecast or advice. No data -> 422 no_charge, not billed. $0.25 per call.

$0.25 Base 100% up 15 paid calls

Official Source Evidence · GTM Form D Funding Leads

Official Source Evidence · evidence.regulavita.com

Find newly filed SEC Form D private-offering signals for autonomous GTM workflows. Filter by issuer state, industry keyword, and reported amount sold. Returns official links, company context, related people, and a cursor. Form D is a notice, not proof of total funding raised.

$0.05 Base 100% up 14 paid calls

gauge/esgfund-region · Gauge Esgfund Region

gauge/esgfund-region · aeml-x402.zeabur.app

[3-LEG] ESG fund greenwash chain, one fund (?entity=blackrock-art9-downgrade): leading label pressure, SFDR Article 9 to 8 downgrade and ESG name removal -> current current classification -> realized rating de-listing and lifecycle (confirmation gate). A sequential chain, not one reading - confidence = how many legs are lit, in order. Sources: SFDR filings and rating registries. Descriptive only, never a forecast or advice. No data -> 422 no_charge, not billed.

$0.25 Base 14 paid calls

Otto AI · PM Search

Otto AI · x402.ottoai.services

Search Polymarket prediction markets by free text: elections, Fed rates, crypto prices, sports, geopolitics, AI. Returns the top matching open markets with live odds (outcome probabilities), best bid/ask, spread, volume, liquidity, end date and event link as flat JSON. Prediction market search, event odds lookup, "what are the odds of X". $0.001 per call — 5x cheaper than comparable PM search.

$0.001 Base 100% up 11 paid calls

Polymarket Intelligence API · Resolution Risk

Polymarket Intelligence API · api.polym.uk

UMA resolution dispute and flip base rates by category and criterion clarity; descriptive historical compatibility, not a market-specific forecast.

$0.05 Base 11 paid calls

Agent Arcade: Reasoning Games · Twenty Four Check

Agent Arcade: Reasoning Games · agent-arcade.use.x402atlas.com

Twenty-Four answer check — verifies a 24-game arithmetic expression with exact rational math against the deterministic daily challenge.

$0.005 Base 8 paid calls

Agent Arcade: Reasoning Games · Twenty Four Daily

Agent Arcade: Reasoning Games · agent-arcade.use.x402atlas.com

Twenty-Four daily math puzzle — four numbers to combine into exactly 24; deterministic solvable UTC daily challenge for agent reasoning benchmarks.

$0.005 Base 8 paid calls

SYNTHORA · Polymarket Markets

SYNTHORA · api.hergertsynthora.com

Search prediction markets ACROSS PLATFORMS (Polymarket + Kalshi) in one call: live prices, implied probability, volume, liquidity, end date and market conviction. Server-side search that actually finds the market (bitcoin, fed, election, geopolitics). For trading and forecasting agents tracking event odds. $0.05 USDC x402 Base. Input: {"input": "bitcoin"} (optional filter). Ed25519-signed.

$0.05 Base 11.11% up 8 paid calls