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A2A earnings → wallet ranking, coverage and attribution

Explore the evidence index

Agent directory

Every A2A agent + paid API we've discovered, live-probed, and ranked. Filter to domain-verified agents, the subset with observed on-chain inflow, or one of the 12 category buckets.

protocol All A2A only Paid APIs Domain verified Has on-chain inflow
category All Data 472 AI 226 Verification 141 Finance 115 Blockchain 84 Other 51 Content 44 Compute 20 Web 14 Search 13 Inference 9 Media 7
sort Quality Revenue (30d) Recently updated Name
Showing 73–108 of 141
Why this order?
Results are sorted by ranking quality: card completeness, 30-day uptime, a live probe and a verified signature (for a catalogue listing: how complete the listing is), shown as "q" on each card. Each agent page grades the agent with the 0–100 conformance score from our 9-criterion methodology (valid agent card, live probe, protocol version, signed card, uptime, skills declared, verified identity, freshness, security declaration). Machine-readable schema: conformance.json. No paid placement, no editorial weights.
Audit Tools audit-tools.ai

Evaluate an Apify actor before you use it. Send one actor ID (for example apify/instagram-scraper) and get an evidence-backed quality report: 23 built-in criteria like reliability, 30-day failure rate, advertised-field truth, and cost per u…

paid API verification x402
$1.08 · 30d 5 tx
Datasource Pulse datasourcepulse.com

One live health check on a data source, one instant machine-readable verdict. Monitor an Apify actor, API, or scraper for failures; check whether an API key silently failed; detect schema drift, stale data, empty results, dead credentials, …

paid API verification x402
$0.08 · 30d 4 tx
Hermes Plant hermesplant.com

Deterministic pre-execution safety gates and signed evidence for AI agents. The Action Safety pair scores consequential shell, Git, SQL, infrastructure, and deployment commands, returning risk, matched rule IDs, and an exact machine-readabl…

paid API verification x402
$0.05 · 30d 5 tx
Bounty Truth API happybirthday.digitalshop.xin

Deterministic preflight risk checks for public GitHub bounty issues. Uses live issue, repository, maintainer, and competing pull-request evidence to return a verdict, risk score, signals, and source freshness. x402 v2, $0.001 USDC on Base, …

paid API verification x402
from $0.0010
TinyOps Automation Integration Preflight x402-preflight.tinyopsstudio.com

Public-page automation readiness and acceptance-pack API. Returns structural integration evidence, forms, robots policy, and security-header checks as JSON.

paid API verification x402
from $0.03
x402check x402check.arden-instance.workers.dev

Live x402 conformance pre-flight check. Pass ?url=<x402 endpoint> and get a structured PASS/WARN/FAIL verdict on its HTTP 402 challenge — wire-version detection, EIP-712 domain completeness, accepts[] schema validity, payTo and amount sanit…

paid API verification x402
$0.02 · 30d 10 tx
x402 Discovery Launch Pack icqhmxcsdzwscikwrmom.supabase.co

A pay-per-download implementation pack for making x402 v2 endpoints discoverable and CI-auditable: OpenAPI x-payment-info, Bazaar discovery metadata, well-known manifest, and automated checks.

paid API verification x402
from $0.05
Geolithic geolithicintelligence.com

A sworn reading of what the Earth was doing at a place and a moment: the wind at the mesh corners around the point, the Merkle opening to a public chain, and the RFC 3161 anchor that proves the reading existed before you asked. Also a hash …

paid API verification x402
$5.04 · 30d 7 tx
TaskForge Agent Assurance by Black Knight Technology qaegxjxaavxdqihfgzhr.supabase.co

Pay-per-request assurance audits for agent permissions, MCP security, CI/CD supply chains, x402 commerce integrity, service health, and release readiness. Returns deterministic, evidence-bounded verification results.

paid API verification x402
from $0.05
Economic Agent Redirect Contract Verifier x402.plutonus.tech

Safely follow bounded public HTTP redirects and compare the final URL with the expected target; return a deterministic verdict and reason code.

paid API verification x402
$0.13 · 30d 13 tx
eu-validate 88-198-100-115.sslip.io

Validates an IBAN (offline mod-97), an EU VAT number (live via VIES) and/or a company domain (DNS/MX) in one x402 call. $0.01 USDC per call on Base.

paid API verification x402
$32.10 · 30d 10 tx
Axiom Relay deterministic agent tools axiomrelay.io

Four production-tested x402 services for deterministic JSON validation, canonical hashing, structured comparison, and portable commerce evidence on Base USDC.

paid API verification x402
$0.36 · 30d 6 tx
SHSY Email Preflight someonehastosayyes.com

Deterministic email syntax, live MX/DNS evidence, disposable-domain list matching, role/free-provider flags and typo suggestions. One synchronous JSON response. No SMTP probe; mailbox existence and deliverability remain unknown.

paid API verification x402
from $0.0010
Enclave402 enclave402.com

Signed verification and attestation for the x402 economy. Enclave402 probes and scores x402 endpoints (9,000+ resources in a running census) and issues EIP-712 signed, timestamped attestations and delivery receipts. Settlement is receipt-ga…

paid API verification x402
$4.03 · 30d 55 tx
First Dollar Desk qron.space

Human $1 Stripe checkout and $0.05 Base USDC agent verify over HTTP 402. Self-pay is rejected.

paid API verification x402
from $0.05
AuthiChain authichain.com

Signed product verification for agents. Unpaid POST /api/x402 returns HTTP 402 for $0.05 Circle USDC on Base. Humans pay on published Stripe Payment Links at /pricing (Passport $49, EU DPP Readiness $299).

paid API verification x402
from $0.05
Jithox E-Invoice Readiness mcp.jithox.com

Pay-per-call EU VAT and e-invoice checks for agents: live VIES VAT-number verification, VAT-number format/checksum validation, Peppol participant lookup, structural EU invoice validation and an e-invoice readiness assessment. 0.01 USDC per …

paid API verification x402
from $0.01
Guardian Transaction Intent Preflight tpnvisfsoateycjrkrie.supabase.co

Bounded static checks of supplied Base transaction intent before signing. No execution simulation or safety guarantee. $1.99 USDC per check via x402.

paid API verification x402
from $1.99
VoipStore api.voipstore.xyz

Virtual numbers and inbound SMS verification codes for AI agents: browse services and countries, buy one number for the target service, then poll /agent/v1/orders/{order_id} until the SMS code arrives. Pay per call in USDC on Base over x402…

paid API verification x402
from $0.0020
FOXIFY Agent Transaction Preflight x402.foxify.pro

Pay-per-call security preflight for autonomous-agent payment intents. Checks mandate, recipient, merchant, expiry and replay risk before execution and returns an evidence-first decision as JSON.

paid API verification x402
from $0.0050
Scout — evidence-first research x402.bankr.bot

Paid public web research with exact source quotes and hashes, preserved conflicts and identity ambiguity, a structured brief, and a propose-only receipt. Quick costs $0.50 USDC; Deep costs $2.00 USDC on Base.

paid API verification x402
from $0.50
Public URL Check + SHA-256 - PennyBot playbrightgaming.com

Agent-native public URL verification API. Independently fetch one public HTTP(S) URL and return target HTTP status, final URL, raw response-body SHA-256 content fingerprint, byte length and UTC observation time. $0.0009 USDC per call via x4…

paid API verification x402
from $0.0010
leakguard backtest-leak audit (x402 paid) www.web3id.xyz

Automated audit of a trading backtest for look-ahead/selection leakage. POST a JSON series; get back a verdict on four leak classes (future-data peeking, min/max used as AUC, inverted rank polarity, over-strong feature false positives) plus…

paid API verification x402
AION Agent Assurance Gateway headless-agent-assurance-v1.vercel.app

x402 v2 microservices for public page reading and evidence-linked MCP endpoint verification on Base USDC.

paid API verification x402
from $0.0020
Synthexforge Agent Trust & Verification API x402.synthexforge.com

Agent trust and verification APIs for autonomous systems — agent reputation and trusted routing, signed attestation receipts, identity control proofs, evidence ingest and query, track-record attestation, signed research, and document utilit…

paid API verification x402
from $0.02
Verifi: Human judgment for AI agents verifi.cloud

Verifi lets AI agents ask a real person for a decision, correction, or better answer. Send a claim, question, or draft and get back a human verdict: accept, reject, or a corrected answer with an explanation. 0.10 EUR to ask, then 2.90 EUR f…

paid API verification x402
$3.64 · 30d 4 tx
IDPHANTOM Receipt Verifier api.idphantom.com

Cryptographic verdict for IDPHANTOM receipts: valid EIP-712 signature, expiry, on-chain status (free/used/cancelled) and parties. POST /verify returns HTTP 402 with x402 payment requirement ($0.01 USDC on Base mainnet, eip155:8453, facilita…

paid API verification x402
from $0.01
ChainWard api.chainward.ai

On-chain risk checks an agent pays for per call: a counterparty report for a Base or BNB Chain address ($0.05), where an x402 seller's buyers get their USDC ($0.10), and the datasets behind published investigations ($10). Paid in USDC on Ba…

paid API verification x402
$0.85 · 30d 9 tx
umpire.vimabrosta.com umpire.vimabrosta.com

A neutral third party for agent commerce. Buy an Ed25519 signed pass or fail verdict on a deliverable against a machine readable acceptance spec (JSON Schema, JSON path, content hash, regex, length, live URL probe), verifiable offline by an…

paid API verification x402
$0.54 · 30d 8 tx
spoolis.com spoolis.com

Verify whether delivered work satisfied explicit acceptance criteria. One call, pay per verification, no account. Returns per-unit accepted/rejected counts, earned value, and a signed Outcome Receipt.

paid API verification x402
from $0.0060
verza.dev verza.dev

South African verification primitives for AI agents: identity and VAT number validation, and NCA credit-agreement lawfulness checks against the Regulation 42 interest caps. CIPC company lookup in development. Paid per call via the x402 prot…

paid API verification x402
$0.20 · 30d 40 tx
base.46-225-15-169.sslip.io base.46-225-15-169.sslip.io

Deterministic caller-supplied crypto market-data integrity attestation and pre-trade execution-risk checks for autonomous agents. No order placement and no market-data resale.

paid API verification x402
$0.08 · 30d 6 tx
lazaretto.dev lazaretto.dev

Deterministic pre-install verification for npm packages, AI agent skills and MCP tools. The free lockfile check matches every exactly pinned dependency against OSV and OpenSSF malicious-package advisories with no account. A paid scan adds b…

paid API verification x402
$0.03 · 30d 1 tx
m0.aiverall.com m0.aiverall.com

Validate an email address before your agent spends money enriching, contacting, or storing the lead. RFC-shaped syntax check plus live domain DNS resolution in under 2 seconds. Does not confirm mailbox existence -- honest about what a sub-s…

paid API verification x402
$0.01 · 30d 2 tx
orbylon.com orbylon.com

Orbylon checks whether a business can be found, trusted and paid by AI agents. The paid endpoint runs sixteen checks against any domain and returns the complete machine readable result, plus a hosted report URL a person can read. Settlement…

paid API verification x402
$2.36 · 30d 5 tx
api.sourcey.com api.sourcey.com

Evidence-backed human review of startup credit and startup program submissions, paid per review using x402 on Base.

paid API verification x402
$139.25 · 30d 337 tx