paid-api-access

Best execution price across DEXs on Polygon PoS - which DEX is cheapest to buy on and which pays most to sell into. Compares live prices across QuickSwap, SushiSwap and Uniswap v3 and returns the buy venue, the sell venue, the cross-exchange spread in bps, the fee-adjusted gross arbitrage spread and an optimal trade size. Smart order routing and cross-DEX arbitrage data for trading and execution agents on Polygon / MATIC / POL.

Macro economic indicators (inflation, GDP growth, unemployment) for major countries via World Bank API — no API key required.

Returns hot posts from any subreddit (no auth) — titles, scores, authors, links. For trend-monitoring, social-intel, and content-discovery agents. SEO Keywords: Reddit API, subreddit hot posts, trending threads, social listening, no-auth Reddit. Keyless, pay-per-call USDC on Base/Solana, no API key, no signup.

TLS certificate inspection API for agents: inspect issuer, subject, SANs, and expiry for one HTTPS host for $0.01 USDC before an agent trusts the channel.

Score how ready an API is for agent integration using health, OpenAPI, auth hints, x402 signals, and login surface checks.

Open Graph metadata API for agents: extract Open Graph and Twitter card fields from a public URL for $0.01 USDC so agents can unfurl links and preview how a page renders in feeds.

Pay-per-call JSON-RPC proxy to 20+ EVM and Starknet networks on Venice, paid per request in USDC on Base via x402, no API key. Resolve the {network} path segment from GET /api/v1/crypto/rpc/networks.

Pay-per-call API for AI model benchmarks, comparisons, and cited research

Pay-per-call API for AI model benchmarks, comparisons, and cited research

Get companies that a person has invested in. Pagination billing: call the first page normally and save billing.requestId from the Orthogonal /v1/run response. For later page, offset, or cursor calls on the same logical search, pass parentRequestId with unchanged non-pagination parameters. Valid continuation calls still get their own request IDs and quoted price, but are charged 0. Changing filters starts a new billable request.

EconDash economic data API (M2M)

EconDash economic data API (M2M)

EconDash economic data API (M2M)

Check whether an object has a key. Call when you preflight required fields before paid calls. Returns has boolean and key for $0.001 USDC via x402 on Base. No network, no keys, no retention; first-party local JSON only. Results are advisory; the caller owns budgets, auth, and production controls.

Returns whether a specific accessory is compatible with a specific device, along with a confidence score and source citation. Accepts GET (query params) or POST (JSON body) — POST is used by x402 payment clients. Where a pair is covered by

Curated shelf of public-domain gothic and horror fiction, ranked by historical popularity. Returns title, author, year, book_id, and drill-down routes for full-text retrieval. No license, no API key required.

DuneAPI: /v1/farcaster/trends/users - Farcaster Users

USD Coin

USD Coin

USD Coin

USD Coin

USD Coin

Turn messy text — a web page, email, invoice, receipt, job posting, contract clause, product description — into strict JSON matching a schema YOU supply. The schema is enforced in code, not merely requested: output is parsed, validated, repaired once against the exact validation error, and the call FAILS with the violated constraint rather than returning unvalidated JSON. Fields not present in the input come back null instead of a plausible invention. Priced per call. For high-volume use, buy prepaid credits (POST /x402/credits/buy) and send X-Animica-Credits on each request — no settlement, no gas, no per-call payment round trip. Paying in ANM on the animica:1 lane is also ~25% cheaper because we sponsor no gas there.

Get posts from a company's LinkedIn page. Pagination billing: call the first page normally and save billing.requestId from the Orthogonal /v1/run response. For later page, offset, or cursor calls on the same logical search, pass parentRequestId with unchanged non-pagination parameters. Valid continuation calls still get their own request IDs and quoted price, but are charged 0. Changing filters starts a new billable request.