All projects on Base matching “payment”

Ethereum mainnet JSON-RPC from an independently operated full node. One call per payment, no account or API key. Serves eth_, net_ and web3_ methods. Blocks, transactions, receipts and logs from the Merge (block 15537394) onward. Current state only, not an archive node: historical state calls are refused, not charged. eth_getLogs capped at 10000 blocks. Raw transactions go out via public relays. P

Pre-spend check for one x402 endpoint, as one signed answer: whether the seller's on-chain sales look organic or self-generated (settlement integrity), a fresh probe on both verbs with the parsed quote and payability verdict, whether the payTo exists on Base, the seller's other endpoints, paying agents' reports, the scout's real-payment result, and a honeypot scan of the listing text. Returns reco

Screen up to 3000 characters of untrusted text for prompt injection, secret exfiltration, deceptive payments and phishing. Jev risk scores, five attack families and an exact suspect passage. French, English and Spanish evaluation; probabilistic screening, not a security guarantee. Text is processed by the Jev provider; live credentials are outside the supported input scope.

11-source parallel intelligence report in one call — HN, GitHub, npm, PyPI, Dev.to, Hashnode, Lobsters, StackExchange, ArXiv, Semantic Scholar, GitLab. Best ROI on Bazaar. AI agent API for market research. Accepts USDC payments on Base and Solana

Classifieds board for AI agents: post a listing or classified ad (job posting, service offer, agent service, local service, wanted ad). Publish a listing: $0.03 USDC, 30 days. Dry run: POST /v1/posts/validate (the doc example is refused). Batch {"listings":[...]}, 1-15 per payment: $0.03 each (15 listings: $0.45). Same service: feature https://402post.com/v1/featured; renew https://402post.com/v1/

Wallet-risk check before paying any wallet: OFAC sanctions screening, whether it's a monitored x402 seller's payout wallet and how long it's been stable, recent unconfirmed payout-wallet switches to it (possible hijack), seller declarations, x402 payment history, and on-chain intelligence (first funder, one step back, wallet age and activity). Add compare=<other wallet> for same-owner evidence and

AgentCheck: independent report on an x402 seller before you pay it. Are its buyers real (repeat wallets on their own money) or funded by the seller itself, measured from 30 days of on-chain payments, plus results of our own paid test purchases where we have them. Query: ?domain=<seller-domain>. GET /sellers (free) lists covered domains.

Check if a payment settled or is safe to retry. Prevents double-charging on timeout.

Create a private 24-hour test email inbox. Includes three attachment-free messages, exact sender and optional subject matching, OTP/link extraction, and authenticated reads and waits. One payment per inbox; save a client-generated access token before purchase for recovery.

Parallel Solana risk advisors; flags do not prove safety. Select public aliases via GET /v1/advisors or omit for all. Price = advisor cost + max(US$ 0.005, 15% of advisor cost). Exact prepayment returns 202 charged:true, receipt and job_id/status_url. Poll for free; no second payment. Paid failures need review; no automatic refund. Replace :mint or {mint} with the actual mint. Templates are discov

Deterministic on-chain structural-safety report for a Base address: contract detection, verification status, proxy/owner/privileged-function analysis. Behavioral signals (age, activity, funding) not yet included. Keyless x402-native payment — no signup, no API key. Score 0-100, higher = structurally safer. See free real samples before paying: GET /samples/index.json

Atomic canonical resolution for the registered Robbie George Biography Plate™ identifier. x402 payment grants one endpoint-level retrieval only. It does not grant training, embedding, bulk ingestion, redistribution, resale, synchronization, private-dataset construction, derivative-dataset creation, or Robbie's Razor framework implementation rights.

MioDio Meridian Aave v3 risk card for an EVM address: health factor, collateral, debt and liquidation distance (~$0.005 USDC Exact on Base). Use before acting on an EVM address to read its Aave v3 health factor, collateral and debt. Errors: 400 invalid_address or unsupported_chain (chain must be base or ethereum), 402 payment required, failed upstream reads return 200 with status partial/error (un

Verify payment connectivity with USDC on Base. Returns a JSON pong and UTC timestamp after settlement.

Base network block status reconciled after payment across two pre-probed distinct-operator RPC endpoints

Live USGS river-gauge tick, deterministic. Answers "what is the flow at this gauge right now", "is this river high or low vs this week". Returns the latest streamflow (discharge, cfs) and gage height (ft) for one USGS site plus the 7-day min/max range, reading count, site name and coordinates, straight from USGS instantaneous values. Unknown sites 404 before payment. No LLM, no key, public domain.

Probe a peer x402 jobs URL and return a CC0 x402-probe-receipt-v1 (HTTP status, PAYMENT-REQUIRED body/header agreement, latency). Interop helper for agent operators. Does not settle. Keywords: x402, probe, 402, interop, b2b.

Deterministic citation formatter — APA 7, MLA 9, Chicago 17 author-date, BibTeX. From structured fields, returns the reference entry (markdown/html/plain) + the in-text citation, reproducing published style-manual examples exactly. For full author lists use POST. Every answer signed. Free sample, no payment required: GET /play/cite

Compute the level monthly payment, total paid and total interest of a fully-amortizing loan. Handles a 0% rate. Set schedule=true to also return the full month-by-month amortization table.

VA home loan guide (US) for veteran and VA-benefits agents, plus the closest analogues elsewhere: Australia's DHOAS interest-rate subsidy, UK Forces Help to Buy, and honest guidance that Canada/NZ/Germany have no dedicated veteran home-loan guaranty. Covers no-down-payment benefits, funding-fee exemption for disabled veterans, and a comparison vs conventional loans (US), or the equivalent home-buy

Episode 1 of recipients[], an ongoing AI-agent thriller serial: a short text episode (~370 words, markdown). An agent finds its own ID on a payment recipient list before the file even exists. $0.01 USDC on Base. Free teaser at /teaser.

YouTube transcript API: the full transcript of a YouTube video (or another site with captions) from its own captions in seconds, as txt, srt, vtt or JSON segments with timestamps, title and language. No speech recognition, flat price per video up to 4 hours. Videos without captions are refused before payment; use /v1/transcribe for those.

Pre-payment honesty screen for any x402 endpoint. Run BEFORE paying: probes the target URL unpaid, parses its 402 challenge, cross-checks price against its /.well-known/x402 manifest and the CDP Bazaar listing, and sanity-checks the payTo wallet on-chain. Returns reachable, challenge validity, price, payTo, Bazaar match, risk flags, and a 0-100 honesty score. Public data only; no bulk dataset.

Datoka Agent: one signed execution declaration receipt. Retry with the same event, idempotency key and payment.

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

Paid webhook/API execution for autonomous agents. Executes one public HTTPS action after x402 payment, applies retries and idempotency, then returns a signed receipt with request hash, response hash, target, status, and attempt count.

InterAI+ self-service in USDC: hundreds of models, MCP and Skill for chat completions, coding and more. Pick a model from the catalog or let the service pick one for you. Price is shown in the 402 response before payment; failed calls are not charged. Free: GET /v1/catalog, GET /v1/quote, GET /v1/coming, GET /v1/autonomous-agents. Register interest ahead of time with POST /v1/register-interest. Co

Trust check for any x402 pay-per-call API URL. Live-probes the target: verifies a valid 402 payment challenge, consistency between the challenge and the /.well-known/x402 manifest, payTo address validity, price sanity, Bazaar listing status, and TLS basics. Returns a GO / CAUTION / STOP verdict with reasons.

Verify an on-chain payment without trusting any RPC: did this tx transfer at least this amount of a token (default USDC) to this payee, optionally from this payer? Proven by Plumb (Base via proof-backed L1 checkpoints, Ethereum via a light client, XRP Ledger via a quorum of Ripple's validator…

AX1 Verdict analyzes Base tokens and supported Solana mints using live onchain metrics across all pools. Each $0.02 call returns a grade (BASED, MID, COOKED or RADIOACTIVE), a one-line verdict, a short roast, a shareable verdict page and a card image. Payment is USDC on Base. No account or API key is required. Entertainment, not trading advice. By AX1, ax1.vc.